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Institute
- Theodor-Boveri-Institut für Biowissenschaften (2327) (remove)
Sonstige beteiligte Institutionen
- Institut für Tierökologie und Tropenbiologie (2)
- Mildred-Scheel-Nachwuchszentrum (2)
- Ökologische Station Fabrikschleichach (2)
- Albert-Ludwigs-Universität Freiburg (1)
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ResearcherID
- D-1221-2009 (1)
- J-8841-2015 (1)
- N-2030-2015 (1)
Das maligne Melanom ist ein Hauttumor mit steigender Inzidenz und hohen Mortalitätsraten. Da die molekularbiologischen Ereignisse, die der Melanomentwicklung zugrundeliegen, nur unzureichend bekannt sind, gibt es kaum spezifische Therapieansätze. Zur Untersuchung der Melanomentwicklung eignet sich das Xiphophorus-Modell. In diesem System ist die Anwesenheit der RTK Xmrk ausreichend, um durch Aktivierung proliferativer und entdifferenzierender Signalwege und Apoptoseinhibition Melanome zu verursachen. Im Rahmen der vorliegenden Arbeit konnte gezeigt werden, dass Xmrk auch die Migration der Melanozytenzellinie Melan a-Hm induzieren kann. Die Migration der durch Xmrk transformierten Zellen ist amöboid und unabhängig von MAPK- und PI3K-Signalwegen. Eine Funktion bei der Migration haben jedoch die Kinasen FAK und Fyn. Sie bilden möglicherweise einen Proteinkomplex, der für FAK und Src aus zahlreichen anderen Systemen bekannt ist und als Signalplattform für die Zellmigration fungiert. Diese Erkenntnisse können dazu beitragen, das Xiphophorus-Modell weiterzuentwickeln und die Grundlagen der Melanomgenese besser zu verstehen.
Chapter I
The gradual turnover of dead organic material into mineral nutrients is a key ecological function, linking decomposition and primary production, the essential parts of the nutrient-energy cycle. However, disturbances in terms of species or resource losses might impair the equilibrium between production and decomposition. Humanity has converted large proportions of natural landscapes and intensified land-use activity for food production. Globally, only very few areas are totally unaffected by human activity today.
To ensure the maintenance of both essential ecosystem services, knowledge about the interplay of biodiversity and ecosystem functioning as well as effects of intensified management on both is crucial. The vast majority of terrestrial biomass production as well as decomposition take place in forest ecosystems. Though forestry has a long sustainable history in Europe, its intensification during the last century has caused severe impacts on forest features and, consequently, on the associated biota, especially deadwood dependent organisms. Among these, saproxylic beetles are the most diverse group in terms of species numbers and functional diversity, but also most endangered due to habitat loss. These features classify them as ideal research organisms to study effects of intensified forestry on ecosystem services. The BELONGDEAD project located in Germany aimed to investigate deadwood decay and functional consequences of diversity changes in the associated fauna on the decomposition process from the initialisation of deadwood decay to complete degradation.
As part of the BeLongDead project, this dissertation focussed on saproxylic beetle species, thereby evaluating (1) regionally effects of tree species identity of fresh deadwood and (2) forest management of varying intensities on the diversity, abundance and community composition of saproxylic beetles (chapter II); (3) the specialisation degree of different trophic guilds of saproxylic beetles, and thus the stability and robustness of their interaction networks against disturbances (chapter III); (4) the impact of environmental features of local to regional spatial scales on species richness of saproxylic beetles differing in their habitat niche in terms of deadwood decay stages (chapter IV).
Chapter II
The vast majority of European forest ecosystems have been anthropogenically affected, leaving less than 1% of the about 1 milliard hectare as natural forests. A long history of forestry and especially the technological progress during the last century have caused massive habitat fragmentation as well as substantial loss of essential resources in European forest ecosystems. Due to this, the substrate-dependent group of saproxylic beetles has experienced severe species losses. Thus, investigations concerning saproxylic diversity and deadwood volume were badly needed. However, the importance of different deadwood in terms of tree species identity for the colonization by saproxylic beetles under different local and regional management regimes is poorly understood. Therefore, we studied possible regional differences in colonization patterns of saproxylic beetle species in a total of 688 fresh deadwood logs of 13 tree species in 9 sites of managed conifer and beech forests, and unmanaged beech forests, respectively. We found that tree species identity was an important driver in determining saproxylic species composition and abundance within fresh deadwood. However, saproxylic species showed different colonization patterns of deadwood items of the same tree species among the study regions. Regionally consistent, conifer forests were most diverse. We attribute the latter result to the historically adaption of saproxylic beetle species to semi-open forests, which conditions are actually best reflected by conifer forests. To preserve a diverse local species pool of early successional saproxylic beetles, we suggest an equal high degree of deadwood diversity in a tree species context in due consideration of regional differences.
Chapter III
The extinction risk of a particular species corresponds with its species-specific requirements on resources and habitat conditions, in other words with the width of the species` ecological niche. Species with a narrow ecological niche are defined as specialists. Members of this group experience higher extinction risk by resource limitation than generalists, which are able to utilize a variety of resources. For the classification of species as specialists or generalists, thus evaluating possible extinction risks, ecologists use the concept of interaction networks. This method has often been applied for mutualistic or antagonistic plant-animal interactions, but information for networks of detritivores is scarce. Therefore, saproxylic beetle species sampled as described in chapter II were categorised according to their larval diet; additionally their interaction networks (N=108) with 13 dead host tree species were analysed. Specialisation degree was highest for wood-digesting beetles and decreased with increasing trophic level. Also the network indices evaluating robustness and generality indicated a higher susceptibility to species extinctions for xylophagous than for mycetophagous and predatory beetles. The specialisation of xylophagous species on specific tree species might be an adaption to tree species specific ingredients stored for defence against pathogens and pests. However, we conclude that the high specialisation degree of xylophages and thus their higher extinction risk by resource loss harbours certain dangers for ecosystem function and stability as species diversity is positively linked to both.
Chapter IV
Populations depend on individual emigration and immigration events to ensure genetic exchange. For successful migration it is of utmost importance that spatially separated populations are obtainable by specimen. Migratory success depends on the one hand on the species dispersal abilities and on the other on the availability of suitable habitats in the surrounding landscape in which the distinct host populations exist. However, consequences of intensive forest management correspond not only to severe reduction of local deadwood amount, but, among others, also a change in tree species composition and high levels of fragmentation in the surrounding forest area. Saproxylic beetle species differ in their dispersal behaviour according to the temporal availability of their preferred habitat. Generally, early successional saproxylic beetles are able to disperse over large distances, whereas beetles inhabiting advanced decayed wood often remain close to their larval habitat. Due to this, environmental factors might affect saproxylic beetle guilds differently. We classified the saproxylic beetles sampled as described in chapter II according to their calculated habitat niche as early, intermediate or late successional saproxylic beetles. For the different guilds the effects of 14 environmental factors on different spatial scales (stand factors at 0.1 km radius, landscape composition at 2 km radius, and regionally differing abiotic factors in 400 km to 700 km distance) were investigated. Consistently for all guilds, species richness decreased with fragmentation at local and landscape scale, and increased in warmer climate. However, we found contradictory results between the guilds to some extent. We relate this to guild specific habitat requirements of the saproxylic beetles. Therefore, for the development of appropriate conservation practices guild-specific requirements saproxylic beetles have to be considered not only locally but on larger spatial scales.
Chapter V
In conclusion, this dissertation identified main drivers of early successional saproxylic beetle species richness on various spatial scales. Our results emphasize the importance to develop management schemes meeting species-specific and guild-specific habitat requirements of the saproxylic beetle fauna at relevant spatial and temporal scales. Therefore, short-term actions suggested for sustainable forest management should be the focus on a diverse tree species composition consisting of indigenous tree species with respect to regional differences. Moreover, senescent trees, fallen and standing deadwood should remain in the forests, and some tree individuals should be allowed to grow old. Long-term actions should involve the reduction of forest fragmentation and the connection of spatial widely separated forest fragments. Furthermore, to fully understand the effects of forest management long-term research should be conducted to compare habitat requirements of intermediate and late successional beetles with the results presented in this dissertation.
(1) Background: about 10% of Wilms Tumor (WT) patients have a malformation or cancer predisposition syndrome (CPS) with causative germline genetic or epigenetic variants. Knowledge on CPS is essential for genetic counselling. (2) Methods: this retrospective analysis focused on 2927 consecutive patients with WTs registered between 1989 and 2017 in the SIOP/GPOH studies. (3) Results: Genitourinary malformations (GU, N = 66, 2.3%), Beckwith-Wiedemann spectrum (BWS, N = 32, 1.1%), isolated hemihypertrophy (IHH, N = 29, 1.0%), Denys-Drash syndrome (DDS, N = 24, 0.8%) and WAGR syndrome (N = 20, 0.7%) were reported most frequently. Compared to others, these patients were younger at WT diagnosis (median age 24.5 months vs. 39.0 months), had smaller tumors (349.4 mL vs. 487.5 mL), less often metastasis (8.2% vs. 18%), but more often nephroblastomatosis (12.9% vs. 1.9%). WT with IHH was associated with blastemal WT and DDS with stromal subtype. Bilateral WTs were common in WAGR (30%), DDS (29%) and BWS (31%). Chemotherapy induced reduction in tumor volume was poor in DDS (0.4% increase) and favorable in BWS (86.9% reduction). The event-free survival (EFS) of patients with BWS was significantly (p = 0.002) worse than in others. (4) Conclusions: CPS should be considered in WTs with specific clinical features resulting in referral to a geneticist. Their outcome was not always favorable.
We present a quantitative 3D analysis of the motility of the blood parasite Trypanosoma brucei. Digital in-line holographic microscopy has been used to track single cells with high temporal and spatial accuracy to obtain quantitative data on their behavior. Comparing bloodstream form and insect form trypanosomes as well as mutant and wildtype cells under varying external conditions we were able to derive a general two-state-run-and-tumble-model for trypanosome motility. Differences in the motility of distinct strains indicate that adaption of the trypanosomes to their natural environments involves a change in their mode of swimming.
Spir proteins are the founding members of the novel class of WH2-actin nucleators. A C-terminal modified FYVE zinc finger motif is necessary to target Spir proteins towards intracellular membranes. The function and regulation of the Spir actin organizers at vesicular membranes is almost unknown. Live cell imaging analyses performed in this study show that Spir-2 is localized at tubular vesicles. Cytoplasmic Spir-2-associated vesicles branch and form protrusions, which can make contacts to the microtubule network, where the Spir-2 vesicles stretch and slide along the microtubule filaments. The analysis of living HeLa cells expressing eGFP-tagged Spir-2, Spir-2-ΔKIND and Spir-2-ΔKW (lacking the 4 WH2 domains and the KIND domain) showed Spir-2-associated tubular structures which differ in their length and motility. Throughout the course of that study it could be shown that the tail domain of the actin motor protein myosin Vb, as a force-generating molecule, is colocalizing and co-immunoprecipitating with Spir-2-ΔKW. By using the tail domain of myosin Vb as a dominant negative mutant for myosin Vb-dependent vesicle transport processes it could be shown that Spir-2-ΔKW/MyoVb-cc-tail- associated vesicles exhibit an increased elongation. Moreover, using the microtubule depolymerizing drug nocodazole it could be shown that the elongation and the motility of Spir-2-ΔKW-associated vesicles depends on an intact microtubule cytoskeleton. Motility and morphological dynamics of Spir-2-associated vesicles is therefore dependent on actin, actin motorproteins and microtubule filaments. These results propose a model in which myosin/F-actin forces mediate vesicle branching, allowing the vesicles to move to and in between the microtubule filaments and thereby providing a new degree of freedom in vesicular motility. To determine the exact subcellular localization of Spir-2, colocalization studies were performed. It could be shown that Spir-2 shows a partial colocalization to Rab11a-positive compartments. Furthermore, Spir-2 exhibits an almost identical localization to Arf1 and the Arf1 small G protein but not Rab11a could be immunoprecipitated with Spir-2-ΔKW. This suggests, that Arf1 recruits Spir-2 to Arf1/Rab11a-positive membranes. Another important function of the Spir-2 C-terminus is the membrane targeting by the FYVE domain. By performing a protein-lipid overlay assay, it has been shown that purified GST- and 6xHis-tagged Spir-2-ΔKW bind phosphatidic acid suggesting a mechanism in which Spir-2 is recruited to phosphatidic acid-enriched membranes. To further elucidate the mechanism in which Spir-2 membrane-targeting could be regulated, interaction studies of C-terminal parts of Spir-2 revealed that the Spir-2 proteins interact directly.
Background
The actin cytoskeleton is a hallmark of eukaryotic cells. Its regulation as well as its interaction with other proteins is carefully orchestrated by actin interaction domains. One of the key players is the WH2 motif, which enables binding to actin monomers and filaments and is involved in the regulation of actin nucleation. Contrasting conserved domains, the identification of this motif in protein sequences is challenging, as it is short and poorly conserved.
Findings
To identify divergent members, we combined Hidden-Markov-Model (HMM) to HMM alignments with orthology predictions. Thereby, we identified nearly 500 proteins containing so far not annotated WH2 motifs. This included shootin-1, an actin binding protein involved in neuron polarization. Among others, WH2 motifs of ‘proximal to raf’ (ptr)-orthologs, which are described in the literature, but not annotated in genome databases, were identified.
Conclusion
In summary, we increased the number of WH2 motif containing proteins substantially. This identification of candidate regions for actin interaction could steer their experimental characterization. Furthermore, the approach outlined here can easily be adapted to the identification of divergent members of further domain families.
Mutation Detection in Patients with Retinal Dystrophies Using Targeted Next Generation Sequencing
(2016)
Retinal dystrophies (RD) constitute a group of blinding diseases that are characterized by clinical variability and pronounced genetic heterogeneity. The different nonsyndromic and syndromic forms of RD can be attributed to mutations in more than 200 genes. Consequently, next generation sequencing (NGS) technologies are among the most promising approaches to identify mutations in RD. We screened a large cohort of patients comprising 89 independent cases and families with various subforms of RD applying different NGS platforms. While mutation screening in 50 cases was performed using a RD gene capture panel, 47 cases were analyzed using whole exome sequencing. One family was analyzed using whole genome sequencing. A detection rate of 61% was achieved including mutations in 34 known and two novel RD genes. A total of 69 distinct mutations were identified, including 39 novel mutations. Notably, genetic findings in several families were not consistent with the initial clinical diagnosis. Clinical reassessment resulted in refinement of the clinical diagnosis in some of these families and confirmed the broad clinical spectrum associated with mutations in RD genes.
A cytochrome b preparation from Neurospora crassa mitochondria is found to consist of three polypeptides (apparent molecular weight 10 000, 11 000 and 32 000), a cytochrome aa3 preparation of six to seven polypeptides (apparent molecular weight 8 000, 11 000, 13 000, 18 000, 28 000 and 36 000). Selective incorporation of radioactive amino acids by eilher mitochondrial protein synthesis when the cytoplasmic one is blocked or by the cytoplasmic protein synthesis, when the mitochondrial one is blocked, indicates that one cytochrome b polypeptide (mw 32 000) and one to three cytochrome aa3 polypeptides (mw 36 000, 28 000 and 18 000) are mitochondrial translation products, the other cytochrome b and cytochrome aa3 polypeptides cytoplasmic translation products. The delayed appearance of labeling in the cytochrome b and cytochrome aa3 polypeptides compared to the average cell protein after a pulse of <~H leueine revealed that these polypeptides are derived from separate pools of precursor polypeptides. The pool sizes range from 2 p. cent to 25 p. cent of the amount of the corresponding polypeptide present in the cytochromes. The 32 000 molecular weight polypeptide of cytochrome band at least the 18 000 molecular weight polypeptide of cytochrome aa\(_3\) are mitochondrial translation products as well in the fungus Neurospora crassa as in the insect Locusta migratoria. So, despite the fact that the size of mitochondrial DNA and mitochondrial ribosomes is reduced in insects, the products have maintained their characteristics.
Radioaetive leueine was ineorporated by N eurospora crassa mitoehondria in vivo in the presence of cyeloheximide. When the membrane protein of these mitochondria was ehromatographieally separated on oleyl polymethaerylie aeid resin, & nurober of fraetions were obtained whieh differ with respeet to their eontents of radioaetivity and eytoehromes. The highest speeifie radioaetivity was found in the fraction eontaining eytoehrome aa3• This fraetion proved to be a pure and enzymatically aetive cytoehrome oxidase. Its ratio of absorbanee at 280 nm (ox)/ 443 nm (red.) was 2.1. By means of sodium dodeeylsulfate gel-electrophoresis, this enzymewas separated into five polypeptides with molecular weights of 30000, 20000, 13000, 10000, and 8000. Only the polypeptide with the molecular weight 20000 displayed a high specific radioaetivity.
A chromatographic procedure 1 is described by means of which cytochrome oxidase has been purified from a variety of organisms including the fungus N eurospora crassa,2,3 the unicellular alga Po/ytoma mirum, 4 the insect Locusta migratoria ,5 the frog Xenopus muel/eri,4 and the mammal Rattus norwegicus. 4 This procedure can be used to equal effect for large-scale preparations, starting from grams of mitochondrial protein, or for small-scale preparations starting from milligrams. The cytochrome oxidase preparations from the different organisms are enzymically active. They show similar subunit compositions.
Delayed natural killer (NK) cell reconstitution after allogeneic stem cell transplantation (alloSCT) is associated with a higher risk of developing invasive aspergillosis. The interaction of NK cells with the human pathogen Aspergillus (A.) fumigatus is mediated by the fungal recognition receptor CD56, which is relocated to the fungal interface after contact. Blocking of CD56 signaling inhibits the fungal mediated chemokine secretion of MIP-1α, MIP-1β, and RANTES and reduces cell activation, indicating a functional role of CD56 in fungal recognition. We collected peripheral blood from recipients of an allograft at defined time points after alloSCT (day 60, 90, 120, 180). NK cells were isolated, directly challenged with live A. fumigatus germ tubes, and cell function was analyzed and compared to healthy age and gender-matched individuals. After alloSCT, NK cells displayed a higher percentage of CD56\(^{bright}\)CD16\(^{dim}\) cells throughout the time of blood collection. However, CD56 binding and relocalization to the fungal contact side were decreased. We were able to correlate this deficiency to the administration of corticosteroid therapy that further negatively influenced the secretion of MIP-1α, MIP-1β, and RANTES. As a consequence, the treatment of healthy NK cells ex vivo with corticosteroids abrogated chemokine secretion measured by multiplex immunoassay. Furthermore, we analyzed NK cells regarding their actin cytoskeleton by Structured Illumination Microscopy (SIM) and flow cytometry and demonstrate an actin dysfunction of NK cells shown by reduced F-actin content after fungal co-cultivation early after alloSCT. This dysfunction remains until 180 days post-alloSCT, concluding that further actin-dependent cellular processes may be negatively influenced after alloSCT. To investigate the molecular pathomechansism, we compared CD56 receptor mobility on the plasma membrane of healthy and alloSCT primary NK cells by single-molecule tracking. The results were very robust and reproducible between tested conditions which point to a different molecular mechanism and emphasize the importance of proper CD56 mobility.
In der vorliegenden Arbeit wurde nach Wegen gesucht, den Import peroxisomaler Matrixproteine, der über ein peroxisomales Targeting Signal Typ 2 gesteuert wird, zu messen. Es war vorgesehen, in erster Linie einen enzymchemischen Nachweis zu etablieren, da diese Methode den Vorteil einer Quantifizierbarkeit der Aktivität der gemessenen Enzyme bietet und somit Rückschlüsse auf den Grad einer Beeinträchtigung des Importes zulassen würden. Von dem Test wurde eine Sensitivität gefordert, die eine Messung auch in Homogenaten kultivierter Zellen, insbesondere von CHO-Zellen, erlaubt. Dieses war deswegen gefordert, weil der Test zur Charakterisierung induzierter CHO-Zell-Mutanten eingesetzt werden sollte, die die Merkmale eines PTS 2-Import-Defektes aufweisen. Dieser Nachweis sollte durch eine Messung der Phytanoyl-CoA-Hydroxylase erfolgen. Dieses Enzym ist eines von drei derzeit bekannten Proteinen, die eine PTS 2 besitzen und über diesen Weg importiert werden. Das Substrat für die Hydroxylase war als Phytansäure mit einer 2,3-3H-Markierung in der Arbeitsgruppe vorrätig und wurde für den Test zum CoA-Thioester chemisch umgesetzt. Nach erfolgter enzymatischer Umsetzung von Phytonoyl-CoA zu a-Hydroxyphytanoyl-CoA durch die Hydroxylase waren dann sowohl Edukt wie auch das Produkt durch eine radioaktive Markierung gekennzeichnet und konnten nach einer dünnschicht-chromatographischen Trennung über Kieselgel durch einem Radiodünnschichtscanner nachgewiesen werden. Zunächst wurde mit Hilfe von Homogenaten aus Rattenlebergewebe ein bereits beschriebenes Verfahren zur Messung der Phytanoyl-CoA-Hydroxylase optimiert. Es stellte sich jedoch heraus, daß die Sensitivität dieses Testes nicht hoch genug ist, um die Hydroxylase-Aktivität in Homogenaten kultivierter CHO-Zellen zu messen. An dieser Stelle wurde die Etablierung eines immunchemischen Nachweises begonnen. Hierzu sollten Antikörper gegen die Hydroxylase des chinesischen Zwerghamsters, des Ursprungsorganismus der CHO-Zellen, generiert werden. Eine Reinigung des Enzyms kam nicht in Betracht, weil die Hamster nicht im Labortierhandel erhältlich waren. Folglich musste die cDNA der Hydroxylase aus einer Hamster-cDNA-Bank kloniert werden, nachdem sie durch ihre bekannten Homologe aus Mensch und Maus identifizierbar war. In den verfügbaren cDNA-Banken fand sich keine vollständige Sequenz, so daß mit einer partiellen Sequenz ohne 5´-Ende weitergearbeitet werden musste. Es bot sich im Institut die Möglichkeit, aus dieser Sequenz Pepetide zu bestimmen, die mit hoher Wahrscheinlichkeit stark immunogen wirken. Solche Peptide wurden synthetisiert und nach Koppelung an Trägerproteine neuseeländischen weißen Kaninchen geimpft. Im Elisa wies das Antiserum zum Zeitpunkt seiner Gewinnung einen Titer von etwa 1:10000 auf, zeigte aber im Westernblot neben einer starken Detektion in Laufweite der Hydroxylase auch eine unspezifische Anfärbung der Proben. In der nun durchgeführten Affinitätsreinigung des Antiserums über einer mit den antigenen Peptiden beladenen Säule tauchte das Problem auf, daß die Antikörper so fest binden, daß sie von ihren Antigenen nicht mehr ohne dentaturierende Bedingungen zu lösen waren. Für die weitere Arbeit sollte sich nun eine affinitätschromatographische Reinigung über Peptide, die den Antikörper mit geringerer Avidität binden, anschließen, so daß nach Trennung der Immunkomplexe native Antikörper isoliert werden könnten. Hierzu wäre ein Epitop-mapping wünschenswert, damit auf dieser Grundlage Peptide mit den geforderten Eigenschaften synthetisiert werden können.
No abstract available
The unicellular pathogen Trypanosoma brucei is the causative agent of African
trypanosomiasis, an endemic disease prevalent in sub-Saharan Africa. Trypanosoma brucei alternates between a mammalian host and the tsetse fly vector. The extracellular parasite survives in the mammalian bloodstream by periodically exchanging their ˈvariant surface glycoproteinˈ (VSG) coat to evade the host immune response. This antigenic variation is achieved through monoallelic expression of one VSG variant from subtelomeric ˈbloodstream
form expression sitesˈ (BES) at a given timepoint. During the differentiation from the bloodstream form (BSF) to the procyclic form (PCF) in the tsetse fly midgut, the stage specific surface protein is transcriptionally silenced and replaced by procyclins. Due to their subtelomeric localization on the chromosomes, VSG transcription and silencing is partly regulated by homologues of the mammalian telomere complex such as TbTRF, TbTIF2 and TbRAP1 as well as by ˈtelomere-associated proteinsˈ (TelAPs) like TelAP1. To gain more insights into transcription regulation of VSG genes, the identification and characterization of other TelAPs is critical and has not yet been achieved. In a previous study, two biochemical approaches were used to identify other novel TelAPs. By using ˈco-immunoprecipitationˈ (co-IP) to enrich possible interaction partners of TbTRF and by affinity chromatography using telomeric repeat oligonucleotides, a listing of TelAP candidates has been conducted. With this approach TelAP1 was identified as a novel component of the telomere complex, involved in the kinetics of transcriptional BES silencing during BSF to PCF differentiation. To gain further insights into the telomere complex composition, other previously enriched proteins were characterized through a screening process using RNA interference to deplete potential candidates. VSG expression profile changes and overall proteomic changes after depletion were analyzed by mass spectrometry. With this method, one can gain insights into the functions of the proteins and their involvement in VSG expression site regulation. To validate the interaction of proteins enriched by co-IP with TbTRF and TelAP1 and to identify novel interaction proteins, I performed reciprocal affinity purifications of the four most promising candidates (TelAP2, TelAP3, PPL2 and PolIE) and additionally confirmed colocalization of two candidates with TbTRF via immunofluorescence (TelAP2, TelAP3). TelAP3 colocalizes with TbTRF and potentially interacts with TbTRF, TbTIF2, TelAP1 and TelAP2, as well as with two translesion polymerases PPL2 and PolIE in BSF. PPL2 and PolIE seem to be in close contact to each other at the telomeric ends and fulfill different roles as only PolIE is involved in VSG regulation while PPL2 is not. TelAP2 was previously characterized to be associated with telomeres by partially colocalizing with TbTRF and cells show a VSG derepression phenotype when the protein was depleted. Here I show that TelAP2 interacts with the telomere-binding proteins TbTRF and TbTIF2 as well as with the telomere-associated protein TelAP1 in BSF and that TelAP2 depletion results in a loss of TelAP1 colocalization with TbTRF in BSF.
In conclusion, this study demonstrates that characterizing potential TelAPs is effective in gaining insights into the telomeric complex's composition and its role in VSG regulation in Trypanosoma brucei. Understanding these interactions could potentially lead to new therapeutic targets for combatting African trypanosomiasis.
The social organization of insect colonies has long fascinated naturalists. One of the main features of colony organization is division of labor, whereby each member of the colony specializes in a subset of all tasks required for successful group functioning. The most striking aspect of division of labor is its plasticity: workers switch between tasks in response to external challenges and internal perturbations. The mechanisms underlying flexible division of labor are far from being understood. In order to comprehend how the behavior of individuals gives rise to flexible collective behavior, several questions need to be addressed: We need to know how individuals acquire information about their colony's current demand situation; how they then adjust their behavior according; and which mechanisms integrate dozens or thousands of insect into a higher-order unit. With these questions in mind I have examined two examples of collective and flexible behavior in social bees. First, I addressed the question how a honey bee colony controls its pollen collection. Pollen foraging in honey bees is precisely organized and carefully regulated according to the colony's needs. How this is achieved is unclear. I investigated how foragers acquire information about their colony's pollen need and how they then adjust their behavior. A detailed documentation of pollen foragers in the hive under different pollen need conditions revealed that individual foragers modulate their in-hive working tempo according to the actual pollen need of the colony: Pollen foragers slowed down and stayed in the hive longer when pollen need was low and spent less time in the hive between foraging trips when pollen need of their colony was high. The number of cells inspected before foragers unloaded their pollen load did not change and thus presumably did not serve as cue to pollen need. In contrast, the trophallactic experience of pollen foragers changed with pollen need conditions: trophallactic contacts were shorter when pollen need was high and the number and probability of having short trophallactic contacts increased when pollen need increased. Thus, my results have provided support for the hypothesis that trophallactic experience is one of the various information pathways used by pollen foragers to assess their colony's pollen need. The second example of collective behavior I have examined in this thesis is the control of nest climate in bumble bee colonies, a system differing from pollen collection in honey bees in that information about task need (nest climate parameters) is directly available to all workers. I have shown that an increase in CO2 concentration and temperature level elicits a fanning response whereas an increase in relative humidity does not. The fanning response to temperature and CO2 was graded; the number of fanning bees increased with stimulus intensity. Thus, my study has evidenced flexible colony level control of temperature and CO2. Further, I have shown that the proportion of total work force a colony invests into nest ventilation does not change with colony size. However, the dynamic of the colony response changes: larger colonies show a faster response to perturbations of their colony environment than smaller colonies. Thus, my study has revealed a size-dependent change in the flexible colony behavior underlying homeostasis. I have shown that the colony response to perturbations in nest climate is constituted by workers who differ in responsiveness. Following a brief review of current ideas and models of self-organization and response thresholds in insect colonies, I have presented the first detailed investigation of interindividual variability in the responsiveness of all workers involved in a collective behavior. My study has revealed that bumble bee workers evidence consistent responses to certain stimulus levels and differ in their response thresholds. Some consistently respond to low stimulus intensities, others consistently respond to high stimulus intensities. Workers are stimulus specialists rather than task specialists. Further, I have demonstrated that workers of a colony differ in two other parameters of responsiveness: response probability and fanning activity. Response threshold, response probability and fanning activity are independent parameters of individual behavior. Besides demonstrating and quantifying interindividual variability, my study has provided empirical support for the idea of specialization through reinforcement. Response thresholds of fanning bees decreased over successive trials. I have discussed the importance of interindividual variability for specialization and the collective control of nest climate and present a general discussion of self-organization and selection. This study contributes to our understanding of individual behavior and collective structure in social insects. A fascinating picture of social organization is beginning to emerge. In place of centralized systems of communication and information transmission, insect societies frequently employ mechanisms based upon self-organization. Self-organization promises to be an important and unifying principle in physical, chemical and biological systems.
A cDNA clone of about 2500 basepairswas prepared from the human osteosarcoma cellline U-2 OS by hybridizing with a v-sis probe. Sequence analysis showed that this cDNA contains the coding region for the PDGF-B chain. Here we report that the mitogen secreted by these osteosarcoma cells contains the PDGF-B chain and is probably a homodimer of two B-chains.
Soft tissue tumors of infancy encompass an overlapping spectrum of diseases that pose unique diagnostic and clinical challenges. We studied genomes and transcriptomes of cryptogenic congenital mesoblastic nephroma (CMN), and extended our findings to five anatomically or histologically related soft tissue tumors: infantile fibrosarcoma (IFS), nephroblastomatosis, Wilms tumor, malignant rhabdoid tumor, and clear cell sarcoma of the kidney. A key finding is recurrent mutation of EGFR in CMN by internal tandem duplication of the kinase domain, thus delineating CMN from other childhood renal tumors. Furthermore, we identify BRAF intragenic rearrangements in CMN and IFS. Collectively these findings reveal novel diagnostic markers and therapeutic strategies and highlight a prominent role of isolated intragenic rearrangements as drivers of infant tumors.
TP53 mutations have been associated with anaplasia in Wilms tumour, which conveys a high risk for relapse and fatal outcome. Nevertheless, TP53 alterations have been reported in no more than 60% of anaplastic tumours, and recent data have suggested their presence in tumours that do not fulfil the criteria for anaplasia, questioning the clinical utility of TP53 analysis. Therefore, we characterized the TP53 status in 84 fatal cases of Wilms tumour, irrespective of histological subtype. We identified TP53 alterations in at least 90% of fatal cases of anaplastic Wilms tumour, and even more when diffuse anaplasia was present, indicating a very strong if not absolute coupling between anaplasia and deregulation of p53 function. Unfortunately, TP53 mutations do not provide additional predictive value in anaplastic tumours since the same mutation rate was found in a cohort of non-fatal anaplastic tumours. When classified according to tumour stage, patients with stage I diffuse anaplastic tumours still had a high chance of survival (87%), but this rate dropped to 26% for stages II–IV. Thus, volume of anaplasia or possible spread may turn out to be critical parameters. Importantly, among non-anaplastic fatal tumours, 26% had TP53 alterations, indicating that TP53 screening may identify additional cases at risk. Several of these non-anaplastic tumours fulfilled some criteria for anaplasia, for example nuclear unrest, suggesting that such partial phenotypes should be under special scrutiny to enhance detection of high-risk tumours via TP53 screening. A major drawback is that these alterations are secondary changes that occur only later in tumour development, leading to striking intratumour heterogeneity that requires multiple biopsies and analysis guided by histological criteria. In conclusion, we found a very close correlation between histological signs of anaplasia and TP53 alterations. The latter may precede development of anaplasia and thereby provide diagnostic value pointing towards aggressive disease.
Retinoic acid pathway activity in Wilms tumors and characterization of biological responses in vitro
(2011)
Background: Wilms tumor (WT) is one of the most common malignancies in childhood. With current therapy protocols up to 90% of patients can be cured, but there is still a need to improve therapy for patients with aggressive WT and to reduce treatment intensity where possible. Prior data suggested a deregulation of the retinoic acid (RA) signaling pathway in high-risk WT, but its mode of action remained unclear. Results: The association of retinoid signaling and clinical parameters could be validated in a large independent tumor set, but its relevance in primary nephrectomy tumors from very young children may be different. Reduced RA pathway activity and MYCN overexpression were found in high risk tumors as opposed to tumors with low/ intermediate risk, suggesting a beneficial impact of RA especially on advanced WT. To search for possible modes of action of retinoids as novel therapeutic options, primary tumor cell cultures were treated in vitro with all-trans-RA (ATRA), 9cis-RA, fenretinide and combinations of retinoids and a histone deacetylase (HDAC) inhibitor. Genes deregulated in high risk tumors showed opposite changes upon treatment suggesting a positive effect of retinoids. 6/7 primary cultures tested reduced proliferation, irrespective of prior RA signaling levels. The only variant culture was derived from mesoblastic nephroma, a distinct childhood kidney neoplasm. Retinoid/HDAC inhibitor combinations provided no synergistic effect. ATRA and 9cis-RA induced morphological changes suggestive of differentiation, while fenretinide induced apoptosis in several cultures tested. Microarray analysis of ATRA treated WT cells revealed differential expression of many genes involved in extracellular matrix formation and osteogenic, neuronal or muscle differentiation. The effects documented appear to be reversible upon drug withdrawal, however. Conclusions: Altered retinoic acid signaling has been validated especially in high risk Wilms tumors. In vitro testing of primary tumor cultures provided clear evidence of a potential utility of retinoids in Wilms tumor treatment based on the analysis of gene expression, proliferation, differentiation and apoptosis.
Der Wilms Tumor (WT), auch Nephroblastom genannt, ist einer der häufigsten bösartigen Tumoren im Kindesalter. Er entsteht aus embryonalem undifferenziertem Nierengewebe und tritt meist als unilateraler und sporadischer Tumor auf. In 10-15% der Wilms Tumoren finden sich WT1- und/oder CTNNB1-Mutationen. Während diese schon länger als genetische Ursachen des Nephroblastoms bekannt sind, wurde erst kürzlich WTX als drittes Gen beschrieben, welches eine Rolle in der Tumorentstehung spielt. Für einen Großteil der WT ist die genetische Ursache jedoch unklar. Da die bisher publizierten WTX-Mutationsraten auf Untersuchungen kleiner Gruppen basieren und sich stark unterscheiden, sollten in dieser Arbeit WTX-, CTNNB1- und WT1-Mutationen in einem großen WT-Set bestimmt werden. Verluste genetischen Materials in der WTX-Region traten in 17% der Fälle auf und waren zwischen den Geschlechtern gleich verteilt. Die Sequenzierung von WT-Proben zeigte, dass nur 2% von WTX-Punktmutationen betroffen sind. In weiteren 11,5% der Proben konnte keine WTX-Expression nachgewiesen werden. Die WTX-Veränderungen traten z. T. gemeinsam mit WT1- und/oder CTNNB1-Mutationen auf. Die unvollständige WTX-Deletion in einigen WT legte die Vermutung nahe, dass innerhalb eines Tumors eine Heterogenität in Bezug auf den WTX-Status möglich ist. Dieser Verdacht konnte durch die detaillierte Untersuchung verschiedener Regionen solcher Tumoren erhärtet werden: Hierzu wurden histologisch unterschiedliche Bereiche auf den Anteil einer WTX-Mutation bzw. eines WTX-LOH hin untersucht. Obwohl alle Regionen des jeweiligen Tumors einen kompletten LOH auf Chromosom 11 aufwiesen, waren die WTX-Veränderungen unterschiedlich stark ausgeprägt. Diese Ergebnisse deuten darauf hin, dass WTX-Veränderungen keine notwendigen und frühen Ereignisse in der Tumorentstehung sind, sondern erst später auftreten und nur einen Teil der Tumorzellen betreffen können. Die Vermutung, dass WTX-Mutationen keinen direkten Einfluss auf die Tumorentwicklung und prognose haben, wird durch das Fehlen eines signifikanten Zusammenhangs zwischen WTX-Deletion bzw. WTX-Expression und den klinischen Eigenschaften der WT gestützt. Um die Rolle von Genen, die potentiell an der Entstehung und Entwicklung des Nephroblastoms beteiligt sind, zu untersuchen oder mögliche neue Therapiestrategien zu überprüfen, sind in vitro-Modelle nötig. Da ein solches für Wilms Tumoren nicht etabliert ist, wurden Primärkulturen aus verschiedenen WT-Proben angelegt. Kulturen aus Tumorgewebe von 12 Patienten mit unterschiedlichen genetischen Veränderungen konnten als echte Tumorzellen validiert werden. Zwei Zelltypen ließen sich morphologisch und immunhistochemisch unterscheiden: Zum einen runde, langsam wachsende Zellen mit Epithelcharakter und zum anderen fibroblastenähnliche Zellen, welche weniger differenziert waren und häufig für viele Passagen kultiviert werden konnten. Somit wurde ein Set verschiedener WT-Primärkulturen etabliert, welches nun für in vitro-Experimente zur Untersuchung grundlegender Mechanismen der WT-Entstehung oder zum Test neuer Therapieansätze eingesetzt werden kann. Frühere Microarray-Analysen deuteten auf eine Deregulation des Retinsäure (RA)-Signalwegs in fortgeschrittenen Wilms Tumoren hin. Diese Ergebnisse sollten in einem großen unabhängigen Proben-Set mittels Realtime-RT-PCR validiert werden. Eine Deregulation des RA-Signalwegs und die Überexpression von NMYC wurden für Tumoren der Hochrisikogruppe im Vergleich zu Tumoren mit geringem/mittlerem Risiko nachgewiesen. So stellte sich die Frage, ob Patienten mit fortgeschrittenem WT von einem Retinsäure-Einsatz in der Therapie profitieren könnten. Um dies zu beantworten, wurde der Effekt von verschiedenen Retinoiden auf WT-Primärkulturen untersucht. Die WT-Zellen wurden mit all-trans RA (ATRA), 9cisRA, dem synthetischen Retinoid Fenretinid (4HPR) und Kombinationen von ATRA bzw. 4HPR und einem HDAC-Inhibitor (SAHA) behandelt. Gene, welche in Hochrisiko-WT differenziell reguliert waren, wurden untersucht und zeigten nach RA-Behandlung eine entgegengesetzte Expression. In sechs der sieben verwendeten Primärkulturen wurde eine RA-vermittelte Proliferationsreduktion nachgewiesen. Für die Kombinationen von Retinoiden mit SAHA wurden keine synergistischen Effekte beobachtet. Während Fenretinid in den meisten Kulturen Apoptose induzierte, verursachten ATRA und 9cisRA morphologische Veränderungen, welche auf Differenzierungsvorgänge hindeuteten. Eine Microarray-Analyse ATRA-behandelter WT-Zellen zeigte die differenzielle Regulation vieler Gene, welche eine Rolle in der Bildung der extrazellulären Matrix oder bei Differenzierungsvorgängen von Knochen-, Knorpel-, Nerven- oder Muskelgewebe spielen. Diese Befunde bieten einen weiteren Hinweis darauf, dass Retinoide für den Einsatz in der Therapie des Nephroblastoms geeignet sein könnten.
Peptidergic neurons are not easily integrated into current connectomics concepts, since their peptide messages can be distributed via non-synaptic paracrine signaling or volume transmission. Moreover, the polarity of peptidergic interneurons in terms of in- and out-put sites can be hard to predict and is very little explored. We describe in detail the morphology and the subcellular distribution of fluorescent vesicle/dendrite markers in CCAP neurons (NCCAP), a well defined set of peptidergic neurons in the Drosophila larva. NCCAP can be divided into five morphologically distinct subsets. In contrast to other subsets, serial homologous interneurons in the ventral ganglion show a mixed localization of in- and output markers along ventral neurites that defy a classification as dendritic or axonal compartments. Ultrastructurally, these neurites contain both pre- and postsynaptic sites preferably at varicosities. A significant portion of the synaptic events are due to reciprocal synapses. Peptides are mostly non-synaptically or parasynaptically released, and dense-core vesicles and synaptic vesicle pools are typically well separated. The responsiveness of the NCCAP to ecdysis-triggering hormone may be at least partly dependent on a tonic synaptic inhibition, and is independent of ecdysteroids. Our results reveal a remarkable variety and complexity of local synaptic circuitry within a chemically defined set of peptidergic neurons. Synaptic transmitter signaling as well as peptidergic paracrine signaling and volume transmission from varicosities can be main signaling modes of peptidergic interneurons depending on the subcellular region. The possibility of region-specific variable signaling modes should be taken into account in connectomic studies that aim to dissect the circuitry underlying insect behavior and physiology, in which peptidergic neurons act as important regulators.
Neuropeptides have gained broad attraction in insect neuroscience and physiology, as new genetic tools are increasingly uncovering their wide-ranging pleiotropic functions with high cellular resolution. Allatostatin A (AstA) peptides constitute one of the best studied insect neuropeptide families. In insects and other panarthropods, AstA peptides qualify as brain-gut peptides and have regained attention with the discovery of their role in regulating feeding, growth, activity/sleep and learning. AstA receptor homologs are found throughout the protostomia and group with vertebrate somatostatin/galanin/kisspeptin receptors. In this review, we summarise the current knowledge on the evolution and the pleiotropic and cell-specific non-allatostatic functions of AstA. We speculate about the core functions of AstA signalling, and derive open questions and challengesfor future research on AstA and invertebrate neuropeptides in general.
Purpose
Image acquisition and subsequent manual analysis of cardiac cine MRI is time-consuming. The purpose of this study was to train and evaluate a 3D artificial neural network for semantic segmentation of radially undersampled cardiac MRI to accelerate both scan time and postprocessing.
Methods
A database of Cartesian short-axis MR images of the heart (148,500 images, 484 examinations) was assembled from an openly accessible database and radial undersampling was simulated. A 3D U-Net architecture was pretrained for segmentation of undersampled spatiotemporal cine MRI. Transfer learning was then performed using samples from a second database, comprising 108 non-Cartesian radial cine series of the midventricular myocardium to optimize the performance for authentic data. The performance was evaluated for different levels of undersampling by the Dice similarity coefficient (DSC) with respect to reference labels, as well as by deriving ventricular volumes and myocardial masses.
Results
Without transfer learning, the pretrained model performed moderately on true radial data [maximum number of projections tested, P = 196; DSC = 0.87 (left ventricle), DSC = 0.76 (myocardium), and DSC =0.64 (right ventricle)]. After transfer learning with authentic data, the predictions achieved human level even for high undersampling rates (P = 33, DSC = 0.95, 0.87, and 0.93) without significant difference compared with segmentations derived from fully sampled data.
Conclusion
A 3D U-Net architecture can be used for semantic segmentation of radially undersampled cine acquisitions, achieving a performance comparable with human experts in fully sampled data. This approach can jointly accelerate time-consuming cine image acquisition and cumbersome manual image analysis.
A non-radioactive in situ hybridization method is described for the localization of transcription units of defined genes to lateral loops of Xenopus laevis lampbrush chromosomes. Two Xenopus cONA probes were used encoding the nucleolar protein N038/ B23 and cytokeratin 1(8). Both proteins are known to be synthesized in Xenopus oocytes, and Northern blot analysis revealed the presence of the corresponding mRNAs in different oogenic stages. The probes were enzymatically labeled with biotin-dCTP and hybridized to lampbrush chromosomes. The sites of hybridization were detected either by indirect immunofluorescence microscopy using rabbit antibodies against biotin and fluorescein-conjugated antirabbit IgG or enzymatically using peroxidase-conjugated streptavi din. The probe encoding the nucleolar protein hybridized to two sets of lateral loops on different bivalents, the cytokeratin probe to at least four. Our finding that each probe hybridized to more than one chromosomal locus may reflect the tetraploid nature of the Xenopus laevis genome or results from cross-hybridization to other transcriptionally active members of the N038/ B23-nucleoplasmin or the cytokeratin-Iamin gene families. The method described should facilitate further in situ hybridization studies with appropriate genomic clones in order to map specific DNA sequences to defined loop regions and to come to a better understanding of the relationship between loop organization and gene transcription unit.
Ziel dieser Arbeit war die Untersuchung der psychischen Befindlichkeit und anderer gesundheitsbezogenen Konditionen der Frauen und Männer mit familiären Mamma- und Ovarialkarzinomrisiko sowie die Klärung hinsichtlich der Bewältigung und Auswirkung genetischer Risikoinformation. Es wurden Risikowahrnehmung, Informationsstand, Inanspruchnahme der Beratungsangebote sowie der Früherkennungsmaßnahmen, Einstellung gegenüber genetischer Brustkrebsdiagnostik und familiärer/sozialer Kommunikation untersucht. Die vollständig ausgefüllten Fragebögen von Ratsuchenden und Betroffenen, die an der Beratung und Befragung im Zentrum für „Familiären Brust-/Eierstockkrebs“ teilgenommen haben, wurden von uns ausgewertet. Für die beratenden Institutionen ist das Wissen der vielfältigen psychischen und sozialen Folgen bei den Testsuchenden und deren Familien sehr wichtig. Nur so kann das Betreuungskonzept und das Beratungsangebot verbessert werden.
Antibody against tubulin from porcine brain was used to evaluate the immunological cross reactivity of tubulin from a variety of animal and plant cells. Indirect immunofluorescence microscopy revealed microtubule-containing structures including cytoplasmic microtubules, spindle microtubules, cilia and fIagella. Thus tubulin from diverse species of both mammals and plants show immunological cross-reactivity with tubulin from porcine brain. Results obtained by immunofluorescence microscopy are whenever possible compared with previously known ultrastructural results obtained by electron microscopy.
Aufklärung der Struktur und Charakterisierung des ternären Komplexes aus BMP-2, BMPR-IA und ActR-IIB
(2006)
„Bone Morphogenetic Proteins“ (BMPs) kontrollieren eine Vielzahl unterschiedlichster Prozesse bei der Embryonalentwicklung und der postnatalen Gewebehomöostase. Wie TGF-betas, Activine und andere Mitglieder der TGF-beta Superfamilie vermitteln BMPs ihr Signal durch die Bildung eines aus dem Liganden und zwei Rezeptorsubtypen bestehenden Signalkomplexes. Für die Rezeptoraktivierung ist ein Zwei-Schritt Mechanismus allgemein akzeptiert. Bisher wurde nur der erste Schritt, die Bindung des Liganden an seinen hochaffinen Rezeptor, strukturell untersucht. Der molekulare Mechanismus der anschließenden Rekrutierung des niederaffinen Rezeptortyps war bisher nicht bekannt. Die vorliegende Arbeit beschreibt die Präparation, Kristallisation und Strukturaufklärung des ternären Komplexes aus BMP-2 und den extrazellulären Domänen von BMPR-IA und ActR-IIB. Mit der Kristallstruktur dieses ternären Komplexes kann erstmals der Mechanismus der BMP Rezeptoraktivierung von der Bindung des Liganden bis hin zur Transaktivierung untersucht werden. Der Ligand BMP-2 präsentiert sich hier, im Gegensatz zu anderen Mitgliedern der TGF-beta Superfamilie, als nahezu starre Komponente, um welche die beiden Rezeptortypen symmetrisch angelagert werden. Zwischen den extrazellulären Domänen der Rezeptoren können keine direkten Kontakte beobachtet werden. Die in Zellen beobachtete Kooperativität bei der Rekrutierung des niederaffinen Rezeptors im BMP-2 System ist folglich weder durch allosterische Effekte, noch durch direkte Rezeptor-Rezeptor-Kontakte erklärbar. Vielmehr repräsentiert die Bindung des niederaffinen Rezeptors von BMP-2 einen Minimalmechanismus, bei dem Kooperativität über die Verringerung der Freiheitsgrade durch Lokalisation des Liganden in der Zellmembran erzeugt wird. Die durchgeführten Mutations-/Interaktionsanalysen erlauben vertiefende Einblicke wie Affinität und Spezifität im BMP/Activin-System generiert werden. Es zeigt sich, dass sowohl bei der niederaffinen Interaktion von ActR-IIBecd mit BMP-2 bzw. BMP-7 als auch bei der hochaffinen Bindung von ActA mit ActR-IIBecd ein Großteil der freien Bindungsenergie von denselben hydrophoben Interaktionen getragen wird. Während polare Interaktionen bei der niederaffinen Bindung der BMPs an ActR-IIBecd kaum eine Rolle spielen, stellt die zentrale Wasserstoffbrücke zwischen ActA Ser90(OG) und ActR-IIB Leu61(N) bei der Bildung des Komplexes ActA/ActR-IIBecd eine entscheidende Determinante der hochaffinen Bindung dar. BMP-2 bindet an die Typ II Rezeptoren BMPR-II, ActR-II und ActR-IIB mit nahezu identischer Affinität, daher wird eine promiske Verwendung dieser Rezeptoren angenommen. In dieser Arbeit konnte gezeigt werden, dass die spezifische Erkennung und Bindung der Typ II Rezeptoren durch den Austausch einzelner Aminosäuren modulierbar ist. Mit den hier gewonnenen Kenntnissen über den molekularen Mechanismus der Typ II Rezeptorerkennung ist nun eine Generierung von BMPs mit definierter Typ II Rezeptorspezifität möglich. Diese BMP-2 Varianten können als Werkzeuge zur Aufklärung von Typ II Rezeptor-spezifischen Signalwegen verwendet werden. Ebenso wäre es denkbar, BMP-2 Varianten mit ausgeprägter Typ II Rezeptor Spezifität in vivo zur Modulation TypII Rezeptor spezifischer Signalwege zu benutzen. Beispielsweise könnte ein auf BMP-2 basierendes ActR-IIB-spezifisches Protein als Myostatin-Antagonist zur Behandlung von Muskeldystrophie eingesetzt werden.
The Notch signaling pathway is crucial for mammalian heart development. It controls cell-fate decisions, coordinates patterning processes and regulates proliferation and differentiation. Critical Notch effectors are Hey bHLH transcription factors (TF) that are expressed in atrial (Hey1) and ventricular (Hey2) cardiomyocytes (CM) and in the developing endocardium (Hey1/2/L). The importance of Hey proteins for cardiac development is demonstrated by knockout (KO) mice, which suffer from lethal cardiac defects, such as ventricular septum defects (VSD), valve defects and cardiomyopathy. Despite this clear functional relevance, little is known about Hey downstream targets in the heart and the molecular mechanism by which they are regulated.
Here, I use a cell culture system with inducible Hey1, Hey2 or HeyL expression to study Hey target gene regulation in HEK293 cells, in murine embryonic stem cells (ESC) and in ESC derived CM. In HEK293 cells, I could show that genome wide binding sites largely overlap between all three Hey proteins, but HeyL has many additional binding sites that are not bound by Hey1 or Hey2. Shared binding sites are located close to transcription start sites (TSS) where Hey proteins preferentially bind to canonical E boxes, although more loosely defined modes of binding exist. Additional sites only bound by HeyL are more scattered across the genome. The ability of HeyL to bind these sites depends on the C-terminal part of the protein. Although there are genes which are differently regulated by HeyL, it is unclear whether this regulation results from binding of additional sites by HeyL.
Additionally, Hey target gene regulation was studied in ESC and differentiated CM, which are more relevant for the observed cardiac phenotypes. ESC derived CM contract in culture and are positive for typical cardiac markers by qRT PCR and staining. According to these markers differentiation is unaffected by prolonged Hey1 or Hey2 overexpression. Regulated genes are largely redundant between Hey1 and Hey2. These are mainly other TF involved in e.g. developmental processes, apoptosis, cell migration and cell cycle. Many target genes are cell type specifically regulated causing a shift in Hey repression of genes involved in cell migration in ESC to repression of genes involved in cell cycle in CM.
The number of Hey binding sites is reduced in CM and HEK293 cells compared to ESC, most likely due to more regions of dense chromatin in differentiated cells. Binding sites are enriched at the proximal promoters of down-regulated genes, compared to up-or non-regulated genes. This indicates that up-regulation primarily results from indirect effects, while down-regulation is the direct results of Hey binding to target promoters. The extent of repression generally correlates with the amount of Hey binding and subsequent recruitment of histone deacetylases (Hdac) to target promoters resulting in histone H3 deacetylation.
However, in CM the repressive effect of Hey binding on a subset of genes can be annulled, likely due to binding of cardiac specific activators like Srf, Nkx2-5 and Gata4. These factors seem not to interfere with Hey binding in CM, but they recruit histone acetylases such as p300 that may counteract Hey mediated histone H3 deacetylation. Such a scenario explains differential regulation of Hey target genes between ESC and CM resulting in gene and cell-type specific regulation.
The live sciences currently undergo a paradigm shift to computer aided discoveries. Discoveries in the live sciences were historically made by either direct observation or as a result of chemical assays. Today we see a growing shift toward computer aided analysis and visualization. This gradual process happens in microscopy. Multidimensional laser scanning microscopy can acquire very complex multichannel data from fixed or live specimen. New probes such as visible fluorescent proteins let us observe the expression of genes and track protein localization. Ion sensitive dyes change intensity with the concentration of ions in the cell. The laser scanning confocal allows us to record these processes in three dimensions over time. This work demonstrates the application of software analysis to multidimensional microscopy data. We introduce methods for volume investigation, ion flux analysis and molecular modeling. The visualization methods are based on a multidimensional data model to accommodate complex datasets. The software uses vector processing and multiple processors to accelerate volume rendering and achieve interactive rendering. The algorithms are based on human visual perception and allow the observer a wide range of mixed render modes. The software was used to reconstruct the pituitary development in zebrafish and observe the degeneration of neurons after injury in a mouse model. Calicum indicator dyes have long been used to study calcium fluxes. We optimized the imaging method to minimize impact on the cell. Live cells were imaged continuously for 45 minutes and subjected to increasing does of a drug. We correlated the amplitude of calcium oscillations to increasing doses of a drug and obtain single cell dose response curves. Because this method is very sensitive and measures single cell responses it has potential in drug discovery and characterization. Microtubules form a dynamic cytoskeleton, which is responsible for cell shape, intracellular transport and has an integral role in mitosis. A hallmark of microtubule organization is lateral interactions. Microtubules are bundles by proteins into dense structures. To estimate the contribution of this bundling process, we created a fractal model of microtubule organization. This model demonstrates that morphology of complex microtubule arrays can be explained by bundling alone. In summary we showed that advances in software for visualization, data analysis and modeling lead to new discoveries.
Während der embryonalen Neurogenese spielt die Repression neuraler Gene in nicht neuralen Zellen, sowie in neuralen Vorläuferzellen durch den REST (repressor element silencing transcription factor)-Komplex eine wichtige Rolle. Durch die schrittweise Inaktivierung diese Komplexes im Verlauf der Differenzierung werden neurale Genexpressionsprogramme
gesteuert. Zusätzlich kommt bei der Kontrolle der räumlichen und zeitlichen Regulation der Genexpression während der Neurogenese verschiedenen miRNAs eine wichtige Rolle zu. So konnte in vorangegangenen Arbeiten im Zebrafischen gezeigt werden, dass miR-26b die Transkription eines wichtigen Effektorproteins des REST-Komplexes, CTDSP2 (C-terminal domain small phosphatases), während der Neurogenese negativ reguliert. Da darüber hinaus
die miR-26 Repression zu einer stark verminderten neuronalen Differenzierung führte, kommt diesem regulatorischen Schaltkreis eine zentrale Rolle bei der Neurogenese im Zebrafisch zu.
Die zusammen mit ihren Ctdsp-Wirtsgenen koexprimierte miR-26 Familie liegt in Vertebraten evolutionär hoch konserviert vor. Analog zum Zebrafisch konnte im murinen in vitro ES-Zell Differenzierungssystem gezeigt werden, dass miR-26 die Expression von Ctdsp2 reprimiert.
Weiterhin konnte in diesem System gezeigt werden, dass auch Rest ein miR-26 Zielgen ist und dass der Verlust der miR-26 zu einem Arrest der differenzierenden Zellen im neuronalen Vorläuferstadium führt. Zusammengenommen deuten diese vorangegangenen Arbeiten auf
eine zentrale Rolle der miR-26 während der Neurogenese hin.
Die hier vorgestellte Arbeit zielte zunächst darauf ab die Regulation des REST-Komplexes durch die miR-26 auf molekularer Ebene besser zu verstehen. Der Verlust der miR-26 Bindestelle in der Ctdsp2 mRNA führte zu einer erhöhten Ctdsp2 Expression, beeinflusste aber
nicht die terminale Differenzierung zu Neuronen. Im Gegensatz hierzu führte der Verlust der miR-26 Bindestelle in der Rest mRNA zu einem Arrest der Differenzierung im neuralen Vorläuferzellstadium. Zellen in denen die miR-26 Bindestelle in Rest deletiert war, zeigten zudem, genau wie miR-26 knockout (KO) Zellen, eine erhöhte Expression von REST-Komplex Komponenten, sowie eine verringerte Expression von REST-regulierten miRNAs.
Zusammengenommen weisen diese Daten daraufhin, dass während der Neurogenese im Säugersystem die Inaktivierung von Rest durch miR-26 für die Maturierung von Neuronen eine zentrale Rolle spielt.
Ein weiterer Fokus dieser Arbeit lag auf der Regulation der miR-26 Expression während der Neurogenese. Vorangegangene Arbeiten in nicht-neuronalen Zelltypen identifizierten die lnc (long-non-coding) RNA Malat1 als eine ce (competitive endogenous) RNA der miR-26. Um den Einfluss von Malat1 auf die miR-26 Expression während der Neurogenese zu untersuchen,
wurde zunächst mittels CRISPR/Cas9 der vollständige Malat1-Lokus in ESCs deletiert. Der Verlust von Malat1 führte zu einer erhöhten Expression der miR-26 Familienmitglieder sowie deren Ctdsp-Wirtsgene. Weiterhin war die Proliferation von Malat1 KO neuronalen
Vorläuferzellen stark vermindert, was mit einer Erhöhung der Frequenz seneszenter Zellen einherging. Durch die Inaktivierung von miR-26 in differenzierenden Malat1 KO ESCs konnte dieser proliferative Phänotyp aufgehoben werden. Darüber hinaus konnte eine verstärkte neuronale Differenzierung dieser Zellen beobachtet werden.
Zusammenfassend zeigen diese Daten, dass neben der Regulation des REST-Komplexes durch miR-26 auch die Kontrolle des Zellzyklus über die Malat1-vermittelte Regulation der miR-26
in neuronalen Vorläuferzellen einen kritischen Schritt bei der Differenzierung von neuronalen Vorläuferzellen zu maturen Neuronen darstellt.
Climate affects both the distribution and abundance of isopods. Humidity and moisture affect their activity and distribution. Survival of juveniles is largely dependent on moisture. The reproductive pattern is affected by temperature and light. Food affects growth and thus, indirectly, also reproduction, as larger females tend to produce larger broods and more frequent broods than smaller ones. Generally in isopods there is little evidence to suggest that food is a very important factor affecting their abundance. Both semelparity and iteroparity are found in isopods and both reproductive strategies are apparently successful. Mortality factors affect the oocytes, the marsupial stages, and most of all the newly released individuals . Apart from climatic factors, predation and, to a lesser extent, parasitism are the main causes of mortality. Longevity of isopods ranges from one to five years. Occasional population explosions ofisopods are known to take place, their cause being unknown.
The regulation of replication is essential to preserve genome integrity. Mms1 is part of the E3 ubiquitin ligase complex that is linked to replication fork progression. By identifying Mms1 binding sites genome-wide in Saccharomyces cerevisiae we connected Mms1 function to genome integrity and replication fork progression at particular G-rich motifs. This motif can form G-quadruplex (G4) structures in vitro. G4 are stable DNA structures that are known to impede replication fork progression. In the absence of Mms1, genome stability is at risk at these G-rich/G4 regions as demonstrated by gross chromosomal rearrangement assays. Mms1 binds throughout the cell cycle to these G-rich/G4 regions and supports the binding of Pif1 DNA helicase. Based on these data we propose a mechanistic model in which Mms1 binds to specific G-rich/G4 motif located on the lagging strand template for DNA replication and supports Pif1 function, DNA replication and genome integrity.
Background: Hemostasis is a critical and active function of the blood mediated by platelets. Therefore, the prevention of pathological platelet aggregation is of great importance as well as of pharmaceutical and medical interest. Endogenous platelet inhibition is predominantly based on cyclic nucleotides (cAMP, cGMP) elevation and subsequent cyclic nucleotide-dependent protein kinase (PKA, PKG) activation. In turn, platelet phosphodiesterases (PDEs) and protein phosphatases counterbalance their activity. This main inhibitory pathway in human platelets is crucial for countervailing unwanted platelet activation. Consequently, the regulators of cyclic nucleotide signaling are of particular interest to pharmacology and therapeutics of atherothrombosis. Modeling of pharmacodynamics allows understanding this intricate signaling and supports the precise description of these pivotal targets for pharmacological modulation. Results: We modeled dynamically concentration-dependent responses of pathway effectors (inhibitors, activators, drug combinations) to cyclic nucleotide signaling as well as to downstream signaling events and verified resulting model predictions by experimental data. Experiments with various cAMP affecting compounds including antiplatelet drugs and their combinations revealed a high fidelity, fine-tuned cAMP signaling in platelets without crosstalk to the cGMP pathway. The model and the data provide evidence for two independent feedback loops: PKA, which is activated by elevated cAMP levels in the platelet, subsequently inhibits adenylyl cyclase (AC) but as well activates PDE3. By multi-experiment fitting, we established a comprehensive dynamic model with one predictive, optimized and validated set of parameters. Different pharmacological conditions (inhibition, activation, drug combinations, permanent and transient perturbations) are successfully tested and simulated, including statistical validation and sensitivity analysis. Downstream cyclic nucleotide signaling events target different phosphorylation sites for cAMP- and cGMP-dependent protein kinases (PKA, PKG) in the vasodilator-stimulated phosphoprotein (VASP). VASP phosphorylation as well as cAMP levels resulting from different drug strengths and combined stimulants were quantitatively modeled. These predictions were again experimentally validated. High sensitivity of the signaling pathway at low concentrations is involved in a fine-tuned balance as well as stable activation of this inhibitory cyclic nucleotide pathway. Conclusions: On the basis of experimental data, literature mining and database screening we established a dynamic in silico model of cyclic nucleotide signaling and probed its signaling sensitivity. Thoroughly validated, it successfully predicts drug combination effects on platelet function, including synergism, antagonism and regulatory loops.
A subtly regulated and controlled course of cellular processes is essential for the healthy functioning not only of single cells, but also of organs being constituted thereof. In return, this entails the proper functioning of the whole organism. This implies a complex intra- and inter-cellular communication and signal processing that require equally multi-faceted methods to describe and investigate the underlying processes. Within the scope of this thesis, mathematical modeling of cellular signaling finds its application in the analysis of cellular processes and signaling cascades in different organisms. ...
There is more and more evidence for the cancer stem cell hypothesis which believes that cancers are driven by a cellular subcomponent that has stem cell properties which is self-renewal, tumorigenicity and multilineage differentiation capacity. Cancer stem cells have been connected to the initiation of tumors and are even found to be responsible for relapses after apparently curative therapies have been undertaken. This hypothesis changes our conceptual approach of oncogenesis and shall have implications in breast cancer prevention, detection and treatment, especially in metastatic breast cancer for which no curative treatment exists. Given the specific stem cell features, novel therapeutic pathways can be targeted. Since the value of vaccinia virus as a vaccination virus against smallpox was discovered by E. Jenner at 18th century, it plays an important role in human medicine and molecular biology. After smallpox was successfully eradicated, vaccinia virus is mainly used as a viral vector in molecular biology and increasingly in cancer therapy. The outstanding capability to specifically target and destroy cancer cells makes it a perfect agent for oncolytic virotherapy. Furthermore, the virus can easily be modified by inserting genes which encode therapeutic or diagnostic proteins to be expressed when a tumor is infected. The emphasis in this study was the establishment of methods for the enrichment of human breast cancer stem-like cells from cancer cell lines and characterization of those cancer stem-like cells in vitro and in vivo. Furthermore, by using the Genelux Corporation vaccinia virus strain GLV-1h68, the isolated cancer stem-like cells can be targeted not only in vitro but also in vivo more efficiently. Side-population (SP) cells within cancers and cell lines are rare cell populations known to be enriched cancer stem-like cells. In this study, we used Hoechst 33342 staining and flow cytometry to identify SP cells from the human breast cancer cell lines MCF-7 and GI-101A as models for cancer stem-like cells. Considering the cytotoxicity of Hoechst dye and the restriction of instrument, we did not carry out further studies by this method. Utilizing in vitro and in vivo experimental systems, we showed that human breast cancer cell line GI-101A with aldehyde dehydrogenase activity (ALDH) have stemlike properties. Higher ALDH activity identifies the tumorigenic cell fraction which is capable of self-renewal and of generating tumors that could recapitulate the heterogeneity of the parental tumor. Furthermore, the cells with higher ALDH activity display significant resistance to chemotherapy and ionizing radiation, which proves their stem-like properties again. The cells which have higher ALDH activity also are more invasive compared to cells which have lower ALDH activity, which connects the cancer stem-like cells with cancer metastases. By analyzing the popular human breast cancer stem cells surface markers CD44, CD49f and CD24, it was discovered that the cells with higher ALDH activity have stronger CD44 and CD49f expression than in those cells with lower ALDH activity, which further confirms their stem-like properties. Finally, the cells with higher ALDH activity and lower ALDH activity were infected in vitro and used in virotherapy in a mouse xenograft model was performed. The results indicated that the vaccinia virus GLV-1h68 can replicate in cells with higher ALDH activity more efficiently than cells with lower ALDH activity. GLV-1h68 also can selectively target and eradicate the xenograft tumors which were derived from cells with higher ALDH activity. The epithelial-mesenchymal transition (EMT) is a key developmental program that is often activated during cancer invasion and metastases. EMT was induced in immortalized human mammary epithelial cells (HMLEs) and in GI-101A cells, which results in the acquisition of mesenchymal traits and in the expression of stem cell markers. Furthermore, the EMT-induced GI-101A cells showed resistance to chemotherapy and invasion capacity. CD44+/CD24- cells were enriched during the EMT induction. Following flow cytometry sorting by using CD44, CD24 and ESA surface marker, the sorted cells were tested in a mouse model regarding tumorigenicity. Unexpectedly, we found that CD44+/CD24+/ESA+ cells could initiate tumors more efficiently rather than CD44+/CD24-/ESA+ and other fractions in EMTinduced GI-101A cells. We also infected the CD44+/CD24+/ESA+ and CD44+/CD24- /ESA+ cells in vitro and performed virotherapy in a mouse xenograft model. The results indicated that the vaccinia virus GLV-1h68 is able to replicate in CD44+/CD24+/ESA+ cells more efficiently than in CD44+/CD24-/ESA+ cells. GLV-1h68 was also capable to selectively target and eradicate the xenograft tumors which derived from CD44+/CD24+/ESA+ cells. Moreover, CD44- cells have much lower tumorigenicity in the mouse model and CD44- cells derived-tumors are not responsive to vaccinia virotherapy. In summary, we have successfully established an in vitro and in vivo system for the identification, characterization and isolation of cancer stem-like cells from the human breast cancer cell line GI-101A by using the ALDEFLUOR assay. The vaccinia virus GLV-1h68 was able to efficiently target and eradicate the higher ALDH activity cells and tumors derived from those cells. Although contrary to the current assumption, CD44+/CD24+/ESA+ cells in the EMT-induced GI-101A cell line showed stem-like properties and GLV-1h68 was able to efficiently target and eradicate the CD44+/CD24+/ESA+ cells and tumors which derived from those cells. Finally, improved understanding of cancer stem cells may have tremendous relevance for how cancer should be treated. It is menacing that cancer stem cells are resistant to almost all anti-tumor approaches which have already been established for the treatment of metastatic diseases such as ionizing radiation, hormonal therapy, chemotherapy, and small molecular inhibitors. Therefore, it is promising that our results suggest that these cancer stem cells may be susceptible to treatment with oncolytic vaccinia virus.
A new innovative real-time tracking method for flying insects applicable under natural conditions
(2021)
Background
Sixty percent of all species are insects, yet despite global efforts to monitor animal movement patterns, insects are continuously underrepresented. This striking difference between species richness and the number of species monitored is not due to a lack of interest but rather to the lack of technical solutions. Often the accuracy and speed of established tracking methods is not high enough to record behavior and react to it experimentally in real-time, which applies in particular to small flying animals.
Results
Our new method of real-time tracking relates to frequencies of solar radiation which are almost completely absorbed by traveling through the atmosphere. For tracking, photoluminescent tags with a peak emission (1400 nm), which lays in such a region of strong absorption through the atmosphere, were attached to the animals. The photoluminescent properties of passivated lead sulphide quantum dots were responsible for the emission of light by the tags and provide a superb signal-to noise ratio. We developed prototype markers with a weight of 12.5 mg and a diameter of 5 mm. Furthermore, we developed a short wave infrared detection system which can record and determine the position of an animal in a heterogeneous environment with a delay smaller than 10 ms. With this method we were able to track tagged bumblebees as well as hawk moths in a flight arena that was placed outside on a natural meadow.
Conclusion
Our new method eliminates the necessity of a constant or predictable environment for many experimental setups. Furthermore, we postulate that the developed matrix-detector mounted to a multicopter will enable tracking of small flying insects, over medium range distances (>1000m) in the near future because: a) the matrix-detector equipped with an 70 mm interchangeable lens weighs less than 380 g, b) it evaluates the position of an animal in real-time and c) it can directly control and communicate with electronic devices.
Tree invasions have substantial impacts on biodiversity and ecosystem functioning, and trees that are dispersed by animals are more likely to become invasive. In addition, hybridisation between plants is well documented as a source of new weeds, as hybrids gain new characteristics that allow them to become invasive. Corymbia torelliana is an invasive tree with an unusual animal dispersal mechanism: seed dispersal by stingless bees, that hybridizes readily with other species. We examined hybrids between C. torelliana and C. citriodora subsp. citriodora to determine whether hybrids have inherited the seed dispersal characteristics of C. torelliana that allow bee dispersal. Some hybrid fruits displayed the characteristic hollowness, resin production and resin chemistry associated with seed dispersal by bees. However, we did not observe bees foraging on any hybrid fruits until they had been damaged. We conclude that C. torelliana and C. citriodora subsp. citriodora hybrids can inherit some fruit characters that are associated with dispersal by bees, but we did not find a hybrid with the complete set of characters that would enable bee dispersal. However, around 20,000 hybrids have been planted in Australia, and ongoing monitoring is necessary to identify any hybrids that may become invasive.
Enormous amounts of data are being generated by modern methods such as transcriptome or exome sequencing and microarray profiling. Primary analyses such as quality control, normalization, statistics and mapping are highly complex and need to be performed by specialists. Thereafter, results are handed back to biomedical researchers, who are then confronted with complicated data lists. For rather simple tasks like data filtering, sorting and cross-association there is a need for new tools which can be used by non-specialists. Here, we describe CrossQuery, a web tool that enables straight forward, simple syntax queries to be executed on transcriptome sequencing and microarray datasets. We provide deepsequencing data sets of stem cell lines derived from the model fish Medaka and microarray data of human endothelial cells. In the example datasets provided, mRNA expression levels, gene, transcript and sample identification numbers, GO-terms and gene descriptions can be freely correlated, filtered and sorted. Queries can be saved for later reuse and results can be exported to standard formats that allow copy-and-paste to all widespread data visualization tools such as Microsoft Excel. CrossQuery enables researchers to quickly and freely work with transcriptome and microarray data sets requiring only minimal computer skills. Furthermore, CrossQuery allows growing association of multiple datasets as long as at least one common point of correlated information, such as transcript identification numbers or GO-terms, is shared between samples. For advanced users, the object-oriented plug-in and event-driven code design of both server-side and client-side scripts allow easy addition of new features, data sources and data types.
Enormous amounts of data are being generated by modern methods such as transcriptome or exome sequencing and microarray profiling. Primary analyses such as quality control, normalization, statistics and mapping are highly complex and need to be performed by specialists. Thereafter, results are handed back to biomedical researchers, who are then confronted with complicated data lists. For rather simple tasks like data filtering, sorting and cross-association there is a need for new tools which can be used by non-specialists. Here, we describe CrossQuery, a web tool that enables straight forward, simple syntax queries to be executed on transcriptome sequencing and microarray datasets. We provide deep-sequencing data sets of stem cell lines derived from the model fish Medaka and microarray data of human endothelial cells. In the example datasets provided, mRNA expression levels, gene, transcript and sample identification numbers, GO-terms and gene descriptions can be freely correlated, filtered and sorted. Queries can be saved for later reuse and results can be exported to standard formats that allow copy-and-paste to all widespread data visualization tools such as Microsoft Excel. CrossQuery enables researchers to quickly and freely work with transcriptome and microarray data sets requiring only minimal computer skills. Furthermore, CrossQuery allows growing association of multiple datasets as long as at least one common point of correlated information, such as transcript identification numbers or GO-terms, is shared between samples. For advanced users, the object-oriented plug-in and event-driven code design of both server-side and client-side scripts allow easy addition of new features, data sources and data types.
Funktionelle Charakterisierung neuer Proteine der inneren Kernmembran von Drosophila melanogaster: Drosophila Lamin B Rezeptor (dLBR), ein integrales Membranprotein der inneren Kernmembran; Bocksbeutel alpha und Bocksbeutel beta, LEM-Domänen Proteine sowie deren potentiellen Interaktionspartner Drosophila Barrier-to-Autointegration Factor (dBAF).
Strains of the food-borne pathogen Listeria (L.) monocytogenes have diverse virulence potential. This study focused on the virulence of three outbreak strains: the CC1 strain PF49 (serovar 4b) from a cheese-associated outbreak in Switzerland, the clinical CC2 strain F80594 (serovar 4b), and strain G6006 (CC3, serovar 1/2a), responsible for a large gastroenteritis outbreak in the USA due to chocolate milk. We analysed the genomes and characterized the virulence in vitro and in vivo. Whole-genome sequencing revealed a high conservation of the major virulence genes. Minor deviations of the gene contents were found in the autolysins Ami, Auto, and IspC. Moreover, different ActA variants were present. Strain PF49 and F80594 showed prolonged survival in the liver of infected mice. Invasion and intracellular proliferation were similar for all strains, but the CC1 and CC2 strains showed increased spreading in intestinal epithelial Caco2 cells compared to strain G6006. Overall, this study revealed long-term survival of serovar 4b strains F80594 and PF49 in the liver of mice. Future work will be needed to determine the genes and molecular mechanism behind the long-term survival of L. monocytogenes strains in organs.
Zinkoxid-Nanopartikel (ZnO-NP) finden in vielen Produkten des täglichen Verbrauchs Verwendung. Daten über die toxikologischen Eigenschaften von ZnO-NP werden kontrovers diskutiert. Die menschliche Haut ist in Bezug auf die ZnO-NP Exposition das wichtigste Kontakt-Organ. Intakte Haut stellt eine suffiziente Barriere gegenüber NP dar. Bei defekter Haut ist ein Kontakt zu den proliferierenden Stammzellen möglich, sodass diese als wichtiges toxikologische Ziel für NP darstellen. Das Ziel dieser Dissertation war die Bewertung der genotoxischen und zytotoxischen Effekte an humanen mesenchymalen Stammzellen (hMSC) durch niedrig dosierte ZnO-NP nach 24 stündiger Exposition, repetitiven Expositionen und im Langzeitversuch bis zu 6 Wochen. Zytotoxische Wirkungen von ZnO-NP wurden mit 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazoliumbromid-Test (MTT) gemessen. Darüber hinaus wurde die Genotoxizität durch den Comet-Assay bewertet. Zur Langzeitbeobachtung bis zu 6 Wochen wurde die Transmissionselektronenmikroskopie (TEM) verwendet. Zytotoxizität nach 24-stündiger ZnO-NP-Exposition war ab einer Konzentration von 50 µg/ml nachweisbar. Genotoxizität konnten bereits bei Konzentrationen von 1 und 10 µg/ml ZnO-NP beschrieben werden. Wiederholte Exposition verstärkte die Zyto-, aber nicht die Genotoxizität. Eine intrazelluläre NP-Akkumulation mit Penetration der Zellorganelle wurde bei einer Exposition bis zu 6 Wochen beobachtet. Die Ergebnisse deuten auf zytotoxische und genotoxisches Effekte von ZnO-NP hin. Bereits geringe Dosen von ZnO-NP können bei wiederholter Exposition toxische Wirkungen hervorrufen sowie eine langfristige Zellakkumulation. Diese Daten sollten bei der Verwendung von ZnO-NP an geschädigter Haut berücksichtigt werden.
Background
Epidural catheters are state of the art for postoperative analgesic in abdominal surgery. Due to neurolysis it can lead to postoperative urinary tract retention (POUR), which leads to prolonged bladder catheterization, which has an increased risk for urinary tract infections (UTI). Our aim was to identify the current perioperative management of urinary catheters and, second, to identify the optimal time of suprapubic bladder catheter removal in regard to the removal of the epidural catheter.
Methods
We sent a questionnaire to 102 German hospitals and analyzed the 83 received answers to evaluate the current handling of bladder drainage and epidural catheters. Then, we conducted a retrospective study including 501 patients, who received an epidural and suprapubic catheter after abdominal surgery at the University Hospital Würzburg. We divided the patients into three groups according to the point in time of suprapubic bladder drainage removal in regard to the removal of the epidural catheter and analyzed the onset of a UTI.
Results
Our survey showed that in almost all hospitals (98.8%), patients received an epidural catheter and a bladder drainage after abdominal surgery. The point in time of urinary catheter removal was equally distributed between before, simultaneously and after the removal of the epidural catheter (respectively: ~28–29%). The retrospective study showed a catheter-associated UTI in 6.7%. Women were affected significantly more often than men (10,7% versus 2,5%, p<0.001). There was a non-significant trend to more UTIs when the suprapubic catheter was removed after the epidural catheter (before: 5.7%, after: 8.4%).
Conclusion
The point in time of suprapubic bladder drainage removal in relation to the removal of the epidural catheter does not seem to correlate with the rate of UTIs. The current handling in Germany is inhomogeneous, so further studies to standardize treatment are recommended.
Cristae architecture is important for the function of mitochondria, the organelles that play the central role in many cellular processes. The mitochondrial contact site and cristae organizing system (MICOS) together with the sorting and assembly machinery (SAM) forms the mitochondrial intermembrane space bridging complex (MIB), a large protein complex present in mammalian mitochondria that partakes in the formation and maintenance of cristae. We report here a new subunit of the mammalian MICOS/MIB complex, an armadillo repeat-containing protein 1 (ArmC1). ArmC1 localizes both to cytosol and mitochondria, where it associates with the outer mitochondrial membrane through its carboxy-terminus. ArmC1 interacts with other constituents of the MICOS/MIB complex and its amounts are reduced upon MICOS/MIB complex depletion. Mitochondria lacking ArmC1 do not show defects in cristae structure, respiration or protein content, but appear fragmented and with reduced motility. ArmC1 represents therefore a peripheral MICOS/MIB component that appears to play a role in mitochondrial distribution in the cell.
Chemical neurotransmission is a complex process of central importance for nervous system function. It is thought to be mediated by the orchestration of hundreds of proteins for its successful execution. Several synaptic proteins have been shown to be relevant for neurotransmission and many of them are highly conserved during evolution- suggesting a universal mechanism for neurotransmission. This process has checkpoints at various places like, neurotransmitter uptake into the vesicles, relocation of the vesicles to the vicinity of calcium channels in order to facilitate Ca2+ induced release thereby modulating the fusion probability, formation of a fusion pore to release the neurotransmitter and finally reuptake of the vesicles by endocytosis. Each of these checkpoints has now become a special area of study and maintains its own importance for the understanding of the overall process. Ca2+ induced release occurs at specialized membrane structures at the synapse known as the active zones. These are highly ordered electron dense grids and are composed of several proteins which assist the synaptic vesicles in relocating in the vicinity of Ca2+ channels thereby increasing their fusion probability and then bringing about the vesicular fusion itself. All the protein modules needed for these processes are thought to be held in tight arrays at the active zones, and the functions of a few have been characterized so far at the vertebrate active zones. Our group is primarily interested in characterizing the molecular architecture of the Drosophila synapse. Due to its powerful genetics and well-established behavioural assays Drosophila is an excellent system to investigate neuronal functioning. Monoclonal antibodies (MABs) from a hybridoma library against Drosophila brain are routinely used to detect novel proteins in the brain in a reverse genetic approach. Upon identification of the protein its encoding genetic locus is characterized and a detailed investigation of its function is initiated. This approach has been particularly useful to detect synaptic proteins, which may go undetected in a forward genetic approach due to lack of an observable phenotype. Proteins like CSP, Synapsin and Sap47 have been identified and characterized using this approach so far. MAB nc82 has been one of the shortlisted antibodies from the same library and is widely used as a general neuropil marker due to the relative transparency of immunohistochemical whole mount staining obtained with this antibody. A careful observation of double stainings at the larval neuromuscular junctions with MAB nc82 and other pre and post-synaptic markers strongly suggested an active zone localization of the nc82 antigen. Synaptic architecture is well characterized in Drosophila at the ultrastructural level. However, molecular details for many synaptic components and especially for the active zone are almost entirely unknown. A possible localization at the active zone for the nc82 antigen served as the motivation to initiate its biochemical characterization and the identification of the encoding gene. In the present thesis it is shown by 2-D gel analysis and mass spectrometry that the nc82 antigen is a novel active zone protein encoded by a complex genetic locus on chromosome 2R. By RT-PCR exons from three open reading frames previously annotated as separate genes are demonstrated to give rise to a transcript of at least 5.5 kb. Northern blots produce a prominent signal of 11 kb and a weak signal of 2 kb. The protein encoded by the 5.5 kb transcript is highly conserved amongst insects and has at its N-terminus significant homology to the previously described vertebrate active zone protein ELKS/ERC/CAST. Bioinformatic analysis predicts coiled-coil domains spread all over the sequence and strongly suggest a function involved in organizing or maintaining the structure of the active zone. The large C-terminal region is highly conserved amongst the insects but has no clear homologues in veretebrates. For a functional analysis of this protein transgenic flies expressing RNAi constructs under the control of the Gal4 regulated enhancer UAS were kindly provided by the collaborating group of S.Sigrist (Gِttingen). A strong pan-neuronal knockdown of the nc82 antigen by transgenic RNAi expression leads to embryonic lethality. A relatively weaker RNAi expression results in behavioural deficits in adult flies including unstable flight and impaired walking behavior. Due to this peculiar phenotype as observed in the first knockdown studies the gene was named “bruchpilot” (brp) encoding the protein “Bruchpilot (BRP)” (German for crash pilot). A pan-neuronal as well as retina specific downregulation of this protein results in loss of ON and OFF transients in ERG recordings indicating dysfunctional synapses. Retina specific downregulation also shows severely impaired optomotor behaviour. Finally, at an ultrastructural level BRP downregulation seems to impair the formation of the characteristic T-shaped synaptic ribbons at the active zones without significantly altering the overall synaptic architecture (in collaboration with E.Asan). Vertebrate active zone protein Bassoon is known to be involved in attaching the synaptic ribbons to the active zones as an adapter between active zone proteins RIBEYE and ERC/CAST. A mutation in Bassoon results in a floating synaptic ribbon phenotype. No protein homologous to Bassoon has been observed in Drosophila. BRP downregulation also results in absence of attached synaptic ribbons at the active zones. This invites the speculation of an adapter like function for BRP in Drosophila. However, while Bassoon mutant mice are viable, BRP deficit in addition to the structural phenotype also results in severe behavioural and physiological anomalies and even stronger downregulation causes embryonic lethality. This therefore suggests an additional and even more important role for BRP in development and normal functioning of synapses in Drosophila and also in other insects. However, how BRP regulates synaptic transmission and which other proteins are involved in this BRP dependant pathway remains to be investigated. Such studies certainly will attract prominent attention in the future.
In dieser Arbeit wurden zwei Techniken zur Analyse der Funktion diverser Neuronen in Drosophila melanogaster angewendet. Im ersten Teil wurde mittels in-vivo Calcium Imaging Technik unter Verwendung des Calciumsensors Cameleon neuronale Aktivität entlang des olfaktorischen Signalweges registriert. Hierbei wurde die neuronale Repräsentation der Duftidentität und der Duftintensität untersucht. In Bezug auf diese Fragestellung wurde die Datenverarbeitung und Datenanalyse weiterentwickelt und standardisiert. Die Experimente führten zu dem Ergebnis, dass duftspezifische Aktivitätsmuster auf der Ebene des Antennallobus sehr gut unterscheidbar sind. Manche Aktivitätsmuster der präsentierten Düfte zeigten interessanterweise einen hohen Ähnlichkeitsgrad, wohingegen andere unähnlich waren. In höheren Gehirnzentren wie den Orten der terminalen Aborisationen der Projektionsneurone oder den Pilzkörper Kenyonzellen liegt eine starke Variabilität der duftevozierten Aktivitätsmuster vor, was generelle Interpretationen unmöglich macht und höchstens Vergleiche innerhalb eines Individuums zulässt. Des Weiteren konnte gezeigt werden, dass die Calciumsignale in den Rezeptorneuronen sowie prä- und postsynaptisch in den Projektionsneuronen bei Erhöhung der Konzentration der verschiedenen präsentierten Düfte über einen Bereich von mindestens drei Größenordnungen ansteigen. In den Kenyonzellen des Pilzkörper-Calyx und der Pilzkörper-Loben ist diese Konzentrationsabhängigkeit weniger deutlich ausgeprägt und im Falle der Loben nur für bestimmte Düfte detektierbar. Eine Bestätigung des postulierten „sparsed code“ der Duftpräsentation in den Pilzkörpern konnte in dieser Arbeit nicht erbracht werden, was möglicherweise daran liegt, dass eine Einzelzellauflösung mit der verwendeten Technik nicht erreicht werden kann. Im zweiten Teil dieser Arbeit sollte durch die Nutzung des lichtabhängigen Kationenkanals Channelrhodopsin-2 der Frage nachgegangen werden, ob bestimmte modulatorische Neurone die verstärkenden Eigenschaften eines bestrafenden oder belohnenden Stimulus vermitteln. Die lichtinduzierte Aktivierung von Channelrhodopsin-2 exprimierenden dopaminergen Neuronen als Ersatz für einen aversiven Reiz führte bei einer olfaktorischen Konditionierung bei Larven zur Bildung eines aversiven assoziativen Gedächtnisses. Im Gegensatz dazu induzierte die Aktivierung von Channelrhodopsin-2 in oktopaminergen/tyraminergen Neuronen als Ersatz für einen appetitiven Reiz ein appetitives assoziatives Gedächtnis. Diese Ergebnisse zeigen, dass dopaminerge Neurone bei Larven aversives Duftlernen, oktopaminerge/tyraminerge Neurone dagegen appetitives Duftlernen induzieren.
On the basis of the results of previous national and international trials and studies, the Renal Tumour Study Group of the International Society of Paediatric Oncology (SIOP–RTSG) has developed a new study protocol for paediatric renal tumours: the UMBRELLA SIOP–RTSG 2016 protocol (the UMBRELLA protocol). Currently, the overall outcomes of patients with Wilms tumour are excellent, but subgroups with poor prognosis and increased relapse rates still exist. The identification of these subgroups is of utmost importance to improve treatment stratification, which might lead to reduction of the direct and late effects of chemotherapy. The UMBRELLA protocol aims to validate new prognostic factors, such as blastemal tumour volume and molecular markers, to further improve outcome. To achieve this aim, large, international, high-quality databases are needed, which dictate optimization and international harmonization of specimen handling and comprehensive sampling of biological material, refine definitions and improve logistics for expert review. To promote broad implementation of the UMBRELLA protocol, the updated SIOP–RTSG pathology and molecular biology protocol for Wilms tumours has been outlined, which is a consensus from the SIOP–RTSG pathology panel.
Solitary bees build their nests by modifying the interior of natural cavities, and they provision them with food by importing collected pollen. As a result, the microbiota of the solitary bee nests may be highly dependent on introduced materials. In order to investigate how the collected pollen is associated with the nest microbiota, we used metabarcoding of the ITS2 rDNA and the 16S rDNA to simultaneously characterize the pollen composition and the bacterial communities of 100 solitary bee nest chambers belonging to seven megachilid species. We found a weak correlation between bacterial and pollen alpha diversity and significant associations between the composition of pollen and that of the nest microbiota, contributing to the understanding of the link between foraging and bacteria acquisition for solitary bees. Since solitary bees cannot establish bacterial transmission routes through eusociality, this link could be essential for obtaining bacterial symbionts for this group of valuable pollinators.
Solitary bees are subject to a variety of pressures that cause severe population declines. Currently, habitat loss, temperature shifts, agrochemical exposure, and new parasites are identified as major threats. However, knowledge about detrimental bacteria is scarce, although they may disturb natural microbiomes, disturb nest environments, or harm the larvae directly. To address this gap, we investigated 12 Osmia bicornis nests with deceased larvae and 31 nests with healthy larvae from the same localities in a 16S ribosomal RNA (rRNA) gene metabarcoding study. We sampled larvae, pollen provisions, and nest material and then contrasted bacterial community composition and diversity in healthy and deceased nests. Microbiomes of pollen provisions and larvae showed similarities for healthy larvae, whilst this was not the case for deceased individuals. We identified three bacterial taxa assigned to Paenibacillus sp. (closely related to P. pabuli/amylolyticus/xylanexedens), Sporosarcina sp., and Bacillus sp. as indicative for bacterial communities of deceased larvae, as well as Lactobacillus for corresponding pollen provisions. Furthermore, we performed a provisioning experiment, where we fed larvae with untreated and sterilized pollens, as well as sterilized pollens inoculated with a Bacillus sp. isolate from a deceased larva. Untreated larval microbiomes were consistent with that of the pollen provided. Sterilized pollen alone did not lead to acute mortality, while no microbiome was recoverable from the larvae. In the inoculation treatment, we observed that larval microbiomes were dominated by the seeded bacterium, which resulted in enhanced mortality. These results support that larval microbiomes are strongly determined by the pollen provisions. Further, they underline the need for further investigation of the impact of detrimental bacterial acquired via pollens and potential buffering by a diverse pollen provision microbiome in solitary bees.
Disruption of the zinc finger gene GLI3 has been shown to be the cause of Greig cephalopolysyndactyly syndrome (GCPS), at least in some GCPS translocation patients. To characterize this genomic region on human chromosome 7p13, we have isolated a VAC contig of more than 1000 kb including the GLI3 gene. In this contig the gene itself spans at least 200-250 kb. A CpG island is located in the vicinity of the 5' region of the known GLI3 cDNA, implying a potential promoter region.
No abstract available
The auditory system is an exquisitely complex sensory organ dependent upon the synchronization of numerous processes for proper function. The molecular characterization of hereditary hearing loss is complicated by extreme genetic heterogeneity, wherein hundreds of genes dispersed genome-wide play a central and irreplaceable role in normal hearing function. The present study explores this area on a genome-wide and single gene basis for the detection of genetic mutations playing critical roles in human hearing.
This work initiated with a high resolution SNP array study involving 109 individuals. A 6.9 Mb heterozygous deletion on chromosome 4q35.1q35.2 was identified in a syndromic patient that was in agreement with a chromosome 4q deletion syndrome diagnosis. A 99.9 kb heterozygous deletion of exons 58-64 in USH2A was identified in one patient. Two homozygous deletions and five heterozygous deletions in STRC (DFNB16) were also detected. The homozygous deletions alone were enough to resolve the hearing impairment in the two patients. A Sanger sequencing assay was developed to exclude a pseudogene with a high percentage sequence identity to STRC from the analysis, which further solved three of the six heterozygous deletion patients with the hemizygous, in silico predicted pathogenic mutations c.2726A>T (p.H909L), c.4918C>T (p.L1640F), and c.4402C>T (p.R1468X). A single patient who was copy neutral for STRC and without pathogenic copy number variations had compound heterozygous mutations [c. 2303_2313+1del12 (p.G768Vfs*77) and c.5125A>G (p.T1709A)] in STRC. It has been shown that STRC has been previously underestimated as a hearing loss gene. One additional patient is described who does not have pathogenic copy number variation but is the only affected member of his family having hearing loss with a paternally segregating translocation t(10;15)(q26.13;q21.1).
Twenty-four patients without chromosomal aberrations and the above described patient with an USH2A heterozygous deletion were subjected to a targeted hearing loss gene next generation sequencing panel consisting of either 80 or 129 hearing-relevant genes. The patient having the USH2A heterozygous deletion also disclosed a second mutation in this gene [c.2276G>T (p.C759F)]. This compound heterozygous mutation is the most likely cause of hearing loss in this patient. Nine mutations in genes conferring autosomal dominant hearing loss [ACTG1 (DFNA20/26); CCDC50 (DFNA44); EYA4 (DFNA10); GRHL2 (DFNA28); MYH14 (DFNA4A); MYO6 (DFNA22); TCF21 and twice in MYO1A (DFNA48)] and four genes causing autosomal recessive hearing loss were detected [GJB2 (DFNB1A); MYO7A (DFNB2); MYO15A (DFNB3), and USH2A]. Nine normal hearing controls were also included. Statistical significance was achieved comparing controls and patients that revealed an excess of mutations in the hearing loss patients compared to the control group. The family with the GRHL2 c.1258-1G>A mutation is only the second family published worldwide with a mutation described in this gene to date, supporting the initial claim of this gene causing DFNA28 hearing loss. Audiogram analysis of five affected family members uncovered the progressive nature of DFNA28 hearing impairment. Regression analysis predicted the annual threshold deterioration in each of the five family members with multiple audiograms available over a number of years.
b-Type cytochromes
(1980)
Chlamydia trachomatis (Ctr) can persist over extended times within their host cell and thereby establish chronic infections. One of the major inducers of chlamydial persistence is interferon-gamma (IFN-γ) released by immune cells as a mechanism of immune defence. IFN-γ activates the catabolic depletion of L-tryptophan (Trp) via indoleamine-2,3-dioxygenase (IDO), resulting in persistent Ctr. Here, we show that IFN-γ induces the downregulation of c-Myc, the key regulator of host cell metabolism, in a STAT1-dependent manner. Expression of c-Myc rescued Ctr from IFN-γ-induced persistence in cell lines and human fallopian tube organoids. Trp concentrations control c-Myc levels most likely via the PI3K-GSK3β axis. Unbiased metabolic analysis revealed that Ctr infection reprograms the host cell tricarboxylic acid (TCA) cycle to support pyrimidine biosynthesis. Addition of TCA cycle intermediates or pyrimidine/purine nucleosides to infected cells rescued Ctr from IFN-γ-induced persistence. Thus, our results challenge the longstanding hypothesis of Trp depletion through IDO as the major mechanism of IFN-γ-induced metabolic immune defence and significantly extends the understanding of the role of IFN-γ as a broad modulator of host cell metabolism.
Chlamydia trachomatis, an obligate intracellular human pathogen, is the world’s leading cause of infection related blindness and the most common, bacterial sexually transmitted disease. In order to establish an optimal replicative niche, the pathogen extensively interferes with the physiology of the host cell. Chlamydia switches in its complex developmental cycle between the infectious non-replicative elementary bodies (EBs) and the non-infectious replicative reticulate bodies (RBs). The transformation to RBs, shortly after entering a host cell, is a crucial process in infection to start chlamydial replication. Currently it is unknown how the transition from EBs to RBs is initiated. In this thesis, we could show that, in an axenic media approach, L glutamine uptake by the pathogen is crucial to initiate the EB to RB transition. L-glutamine is converted to amino acids which are used by the bacteria to synthesize peptidoglycan. Peptidoglycan inturn is believed to function in separating dividing Chlamydia. The glutamine metabolism is reprogrammed in infected cells in a c-Myc-dependent manner, in order to accomplish the increased requirement for L-glutamine. Upon a chlamydial infection, the proto-oncogene c-Myc gets upregulated to promote host cell glutaminolysis via glutaminase GLS1 and the L-glutamine transporter SLC1A5/ASCT2. Interference with this metabolic reprogramming leads to limited growth of C. trachomatis. Besides the active infection, Chlamydia can persist over a long period of time within the host cell whereby chronic and recurrent infections establish. C. trachomatis acquire a persistent state during an immune attack in response to elevated interferon-γ (IFN-γ) levels. It has been shown that IFN-γ activates the catabolic depletion of L-tryptophan via indoleamine 2,3-dioxygenase (IDO), resulting in the formation of non-infectious atypical chlamydial forms. In this thesis, we could show that IFN-γ depletes the key metabolic regulator c-Myc, which has been demonstrated to be a prerequisite for chlamydial development and growth, in a STAT1-dependent manner. Moreover, metabolic analyses revealed that the pathogen de routs the host cell TCA cycle to enrich pyrimidine biosynthesis. Supplementing pyrimidines or a-ketoglutarate helps the bacteria to partially overcome the persistent state. Together, the results indicate a central role of c-Myc induced host glutamine metabolism reprogramming and L-glutamine for the development of C. trachomatis, which may provide a basis for anti-infectious strategies. Furthermore, they challenge the longstanding hypothesis of L-tryptophan shortage as the sole reason for IFN-γ induced persistence and suggest a pivotal role of c-Myc in the control of the C. trachomatis dormancy.
Die Kernhülle ist eine hoch spezialisierte Membran, die den eukaryotischen Zellkern umgibt. Sie besteht aus der äußeren und der inneren Kernmembran, die über die Kernporenkomplexe miteinander verbunden werden. Die Kernhülle reguliert nicht nur den Transport von Makromolekülen zwischen dem Nukleoplasma und dem Zytoplasma, sie dient auch der Verankerung des Chromatins und des Zytoskeletts. Durch diese Interaktionen hilft die Kernhülle, den Zellkern innerhalb der Zelle und die Chromosomen innerhalb des Zellkerns zu positionieren, und reguliert dadurch die Expression bestimmter Gene. In höheren Eukaryoten durchlaufen sowohl die Kernhülle, als auch die Kernporenkomplexe während der Zellteilung strukturelle Veränderungen. Zu Beginn der Mitose werden sie abgebaut, um sich am Ende der Mitose in den Tochterzellen erneut zu bilden. Die molekularen Mechanismen, die zum Wiederaufbau der Kernhülle führen, sind kaum geklärt. Ein geeignetes System, um bestimmte Ereignisse bei der Kernhüllenbildung zu untersuchen, liefert das zellfreie System aus Xenopus Eiern und Spermienchromatin (Lohka 1998). Es konnte bereits früher gezeigt werden, dass es im Eiextrakt von Xenopus laevis mindestens zwei verschiedene Vesikelpopulationen gibt, die zur Bildung der Kernhülle beitragen. Eine der Vesikelpopulationen bindet an Chromatin, fusioniert dort und bildet eine Doppelmembran. Die andere Vesikelpopulation bindet an die bereits vorhandene Doppelmembran und sorgt für die Ausbildung der Kernporenkomplexe. Ziel dieser Arbeit war es, diese beiden Membranfraktionen zu isolieren und zu charakterisieren, wobei das Hauptinteresse in der porenbildenden Membranfraktion lag. Durch Zentrifugation über einen diskontinuierlichen Zuckergradienten konnten die Membranvesikel in zwei verschiedene Vesikelfraktionen aufgetrennt werden. Eine Membranfraktion konnte aus der 40%igen Zuckerfraktion („40% Membranfraktion“) isoliert werden, die andere aus der 30%igen Zuckerfraktion („30% Membranfraktion“). Die verschiedenen Membranfraktionen wurden zu in vitro Kernen gegeben, in denen die Kernporen durch vorausgegangene Bildung von Annulate Lamellae depletiert worden waren. Nach Zugabe der 30% Membranfraktion konnte die Bildung von funktionalen Kernporen beobachtet werden. Im Gegensatz dazu zeigte die 40% Membranfraktion keine porenbildenden Eigenschaften. Unter Verwendung eines vereinfachten Systems, bestehend aus Zytosol, Spermienchromatin und den Membranen, wurde gezeigt, dass die 40% Membranfraktion an Chromatin bindet und ausreichend ist, um eine kontinuierliche Doppelmembran ohne Kernporen zu bilden. Die 30% Membranfraktion besitzt keine Chromatinbindungseigenschaften und wird aktiv entlang von Mikrotubuli zu den porenlosen Kernen transportiert. Dort interagiert sie mit der chromatingebundenen 40% Membranfraktion und induziert die Porenbildung. Nach dem Vergleich der Proteinzusammensetzung der beiden Membranfraktionen, konnte das Major Vault Protein (MVP) nur in der porenbildenden Membranfraktion gefunden werden. MVP ist die Hauptstrukturkomponente der Vault-Komplexe, einem Ribonukleo-proteinpartikel, der in den meisten eukaryotischen Zellen vorhanden ist (Kedersha et al., 1991). Bemerkenswerterweise wird über die Funktion der Vault-Komplexe, trotz ihrer übiquitären Expression und ihrem Vorkommen in fast allen eukaryotischen Zellen, immer noch diskutiert. Um mehr über die Funktion und die Lokalisation der Vaults/MVP zu lernen, wurden die Vaults in Anlehnung an die Methode von Kedersha und Rome (1986) aus Xenopus Eiern isoliert. Zusätzlich wurde rekombinantes Xenopus MVP hergestellt, das unter anderem für die Produktion von Antikörpern in Meerschweinchen verwendet wurde. Um herauszufinden, ob die Anwesenheit von MVP in der 30% Membranfraktion in direktem Zusammenhang mit deren porenbildender Eigenschaft steht, wurden gereinigte Vault-Komplexe oder rekombinantes MVP, das alleine ausreichend ist, um in sich zu den charakteristischen Vault-Strukturen zusammenzulagern, zu porenlosen Kernen gegeben. Sowohl gereinigte Vault-Komplexe, als auch rekombinantes MVP waren in der Lage in den porenlosen Kernen die Bildung von funktionalen Kernporen zu induzieren. Untersuchungen zur Lokalisation von MVP zeigten, dass MVP teilweise an der Kernhülle und den Kernporenkomplexen lokalisiert, während der Großteil an MVP zytoplasmatisch vorliegt. Dies sind die ersten Daten, die Vaults/MVP mit der Kernporenbildung in Verbindung bringen. Deshalb bietet diese Arbeit die Grundlage, um diese unerwartete Rolle der Vaults in Zukunft genauer zu charakterisieren.
All forms of restriction, from caloric to amino acid to glucose restriction, have been established in recent years as therapeutic options for various diseases, including cancer. However, usually there is no direct comparison between the different restriction forms. Additionally, many cell culture experiments take place under static conditions. In this work, we used a closed perfusion culture in murine L929 cells over a period of 7 days to compare methionine restriction (MetR) and glucose restriction (LowCarb) in the same system and analysed the metabolome by liquid chromatography mass spectrometry (LC-MS). In addition, we analysed the inhibition of glycolysis by 2-deoxy-D-glucose (2-DG) over a period of 72 h. 2-DG induced very fast a low-energy situation by a reduced glycolysis metabolite flow rate resulting in pyruvate, lactate, and ATP depletion. Under perfusion culture, both MetR and LowCarb were established on the metabolic level. Interestingly, over the period of 7 days, the metabolome of MetR and LowCarb showed more similarities than differences. This leads to the conclusion that the conditioned medium, in addition to the different restriction forms, substantially reprogramm the cells on the metabolic level.
Chlamydia trachomatis is an obligate intracellular human pathogen that grows inside a membranous, cytosolic vacuole termed an inclusion. Septins are a group of 13 GTP-binding proteins that assemble into oligomeric complexes and that can form higher-order filaments. We report here that the septins SEPT2, -9, -11, and probably -7 form fibrillar structures around the chlamydial inclusion. Colocalization studies suggest that these septins combine with F actin into fibers that encase the inclusion. Targeting the expression of individual septins by RNA interference (RNAi) prevented the formation of septin fibers as well as the recruitment of actin to the inclusion. At the end of the developmental cycle of C. trachomatis, newly formed, infectious elementary bodies are released, and this release occurs at least in part through the organized extrusion of intact inclusions. RNAi against SEPT9 or against the combination of SEPT2/7/9 substantially reduced the number of extrusions from a culture of infected HeLa cells. The data suggest that a higher-order structure of four septins is involved in the recruitment or stabilization of the actin coat around the chlamydial inclusion and that this actin recruitment by septins is instrumental for the coordinated egress of C. trachomatis from human cells. The organization of F actin around parasite-containing vacuoles may be a broader response mechanism of mammalian cells to the infection by intracellular, vacuole-dwelling pathogens. IMPORTANCE Chlamydia trachomatis is a frequent bacterial pathogen throughout the world, causing mostly eye and genital infections. C. trachomatis can develop only inside host cells; it multiplies inside a membranous vacuole in the cytosol, termed an inclusion. The inclusion is covered by cytoskeletal "coats" or "cages," whose organization and function are poorly understood. We here report that a relatively little-characterized group of proteins, septins, is required to organize actin fibers on the inclusion and probably through actin the release of the inclusion. Septins are a group of GTP-binding proteins that can organize into heteromeric complexes and then into large filaments. Septins have previously been found to be involved in the interaction of the cell with bacteria in the cytosol. Our observation that they also organize a reaction to bacteria living in vacuoles suggests that they have a function in the recognition of foreign compartments by a parasitized human cell.
Colorectal Cancer and the Human Gut Microbiome: Reproducibility with Whole-Genome Shotgun Sequencing
(2016)
Accumulating evidence indicates that the gut microbiota affects colorectal cancer development, but previous studies have varied in population, technical methods, and associations with cancer. Understanding these variations is needed for comparisons and for potential pooling across studies. Therefore, we performed whole-genome shotgun sequencing on fecal samples from 52 pre-treatment colorectal cancer cases and 52 matched controls from Washington, DC. We compared findings from a previously published 16S rRNA study to the metagenomics-derived taxonomy within the same population. In addition, metagenome-predicted genes, modules, and pathways in the Washington, DC cases and controls were compared to cases and controls recruited in France whose specimens were processed using the same platform. Associations between the presence of fecal Fusobacteria, Fusobacterium, and Porphyromonas with colorectal cancer detected by 16S rRNA were reproduced by metagenomics, whereas higher relative abundance of Clostridia in cancer cases based on 16S rRNA was merely borderline based on metagenomics. This demonstrated that within the same sample set, most, but not all taxonomic associations were seen with both methods. Considering significant cancer associations with the relative abundance of genes, modules, and pathways in a recently published French metagenomics dataset, statistically significant associations in the Washington, DC population were detected for four out of 10 genes, three out of nine modules, and seven out of 17 pathways. In total, colorectal cancer status in the Washington, DC study was associated with 39% of the metagenome-predicted genes, modules, and pathways identified in the French study. More within and between population comparisons are needed to identify sources of variation and disease associations that can be reproduced despite these variations. Future studies should have larger sample sizes or pool data across studies to have sufficient power to detect associations that are reproducible and significant after correction for multiple testing.
Most parasites and parasitoids are adapted to overcome defense mechanisms of their specific hosts and hence colonize a narrow range of host species. Accordingly, an increase in host functional or phylogenetic dissimilarity is expected to increase the species diversity of parasitoids. However, the local diversity of parasitoids may be driven by the accessibility and detectability of hosts, both increasing with increasing host abundance. Yet, the relative importance of these two mechanisms remains unclear. We parallelly reared communities of saproxylic beetle as potential hosts and associated parasitoid Hymenoptera from experimentally felled trees. The dissimilarity of beetle communities was inferred from distances in seven functional traits and from their evolutionary ancestry. We tested the effect of host abundance, species richness, functional, and phylogenetic dissimilarities on the abundance, species richness, and Shannon diversity of parasitoids. Our results showed an increase of abundance, species richness, and Shannon diversity of parasitoids with increasing beetle abundance. Additionally, abundance of parasitoids increased with increasing species richness of beetles. However, functional and phylogenetic dissimilarity showed no effect on the diversity of parasitoids. Our results suggest that the local diversity of parasitoids, of ephemeral and hidden resources like saproxylic beetles, is highest when resources are abundant and thereby detectable and accessible. Hence, in some cases, resources do not need to be diverse to promote parasitoid diversity.
The enrichment of deadwood is essential for the conservation of saproxylic biodiversity in managed forests. However, existing strategies focus on a cost‐intensive increase of deadwood amount, while largely neglecting increasing deadwood diversity.
Deadwood objects, that is logs and branches, from six tree species were experimentally sun exposed, canopy shaded and artificially shaded for 4 years, after which the alpha‐, beta‐ and gamma‐diversity of saproxylic beetles, wood‐inhabiting fungi and spiders were analysed. Analyses of beta‐diversity included the spatial distance between exposed deadwood objects. A random‐drawing procedure was used to identify the combination of tree species and sun exposure that yielded the highest gamma‐diversity at a minimum of exposed deadwood amount.
In sun‐exposed plots, species numbers in logs were higher than in shaded plots for all taxa, while in branches we observed the opposite for saproxylic beetles. Tree species affected the species numbers only of saproxylic beetles and wood‐inhabiting fungi. The beta‐diversity of saproxylic beetles and wood‐inhabiting fungi among logs was influenced by sun exposure and tree species, but beta‐diversity of spiders by sun exposure only. For all saproxylic taxa recorded in logs, differences between communities increased with increasing spatial distance.
A combination of canopy‐shaded Carpinus logs and sun‐exposed Populus logs resulted in the highest species numbers of all investigated saproxylic taxa among all possible combinations of tree species and sun‐exposure treatments.
Synthesis and applications. We recommend incorporating the enrichment of different tree species and particularly the variation in sun exposure into existing strategies of deadwood enrichment. Based on the results of our study, we suggest to combine the logs of softwood broadleaf tree species (e.g. Carpinus, Populus), hardwood broadleaf tree species (e.g. Quercus) and coniferous tree species (e.g. Pinus) under different conditions of sun exposure and distribute them spatially in a landscape to maximize the beneficial effects on overall diversity.
Tree species diversity is important to maintain saproxylic beetle diversity in managed forests. Yet, knowledge about the conservational importance of single tree species and implications for forest management and conservation practices are lacking.
We exposed freshly cut branch‐bundles of 42 tree species, representing tree species native and non‐native to Europe, under sun‐exposed and shaded conditions for 1 year. Afterwards, communities of saproxylic beetles were reared ex situ for 2 years. We tested for the impact of tree species and sun exposure on alpha‐, beta‐, and gamma‐diversity as well as composition of saproxylic beetle communities. Furthermore, the number of colonised tree species by each saproxylic beetle species was determined.
Tree species had a lower impact on saproxylic beetle communities compared to sun exposure. The diversity of saproxylic beetles varied strongly among tree species, with highest alpha‐ and gamma‐diversity found in Quercus petraea. Red‐listed saproxylic beetle species occurred ubiquitously among tree species. We found distinct differences in the community composition of broadleaved and coniferous tree species, native and non‐native tree species as well as sun‐exposed and shaded deadwood.
Our study enhances the understanding of the importance of previously understudied and non‐native tree species for the diversity of saproxylic beetles. To improve conservation practices for saproxylic beetles and especially red‐listed species, we suggest a stronger incorporation of tree species diversity and sun exposure of into forest management strategies, including the enrichment of deadwood from native and with a specific focus on locally rare or silviculturally less important tree species.
Over the past centuries, anthropogenic utilization has fundamentally changed the appearance of European forest ecosystems. Constantly growing and changing demands have led to an enormous decline in ecological key elements and a structural homogenization of most forests. These changes have been accompanied by widespread declines of many forest-dwelling and especially saproxylic, i.e. species depending on deadwood. In order to counteract this development, various conservation strategies have been developed, but they primarily focus on a quantitative deadwood enrichment. However, the diversity of saproxylic species is furthermore driven by a variety of abiotic and biotic determinants as well as interactions between organisms. A detailed understanding of these processes has so far been largely lacking. The aim of the present thesis was therefore to improve the existing ecological knowledge of determinants influencing saproxylic species and species communities in order to provide the basis for evidence-based and adapted conservation measures.
In chapter II of this thesis, I first investigated the impact of sun exposure, tree species, and their combination on saproxylic beetles, wood-inhabiting fungi, and spiders. Therefore, logs and branches of six tree species were set up under different sun exposures in an experimental approach. The impact of sun exposure and tree species strongly differed among single saproxylic taxa as well as diameters of deadwood. All investigated taxa were affected by sun exposure, whereby sun exposure resulted in a higher alpha-diversity of taxa recorded in logs and a lower alpha-diversity of saproxylic beetles reared from branches compared to shading by canopy. Saproxylic beetles and wood-inhabiting fungi as obligate saproxylic species were additionally affected by tree species. In logs, the respective impact of both determinants also resulted in divergent community compositions. Finally, a rarefaction/extrapolation method was used to evaluate the effectiveness of different combinations of tree species and sun exposure for the conservation of saproxylic species diversity. Based on this procedure, a combination of broadleaved and coniferous as well as hard- and softwood tree species was identified to support preferably high levels of saproxylic species diversity.
The aim of chapter III was to evaluate the individual conservational importance of tree species for the protection of saproxylic beetles. For this, the list of tree species sampled for saproxylic beetles was increased to 42 different tree species. The considered tree species represented large parts of taxonomic and phylogenetic diversity native to Central Europe as well as the most important non-native tree species of silvicultural interest. Freshly cut branches were set up for one year and saproxylic beetles were reared afterwards for two subsequent years.
The study revealed that some tree species, in particular Quercus sp., host a particular high diversity of saproxylic beetles, but tree species with a comparatively medium or low overall diversity were likewise important for red-listed saproxylic beetle species. Compared to native tree species, non-native tree species hosted a similar overall species diversity of saproxylic beetles but differed in community composition.
In chapter IV, I finally analysed the interactions of host beetle diversity and the diversity of associated parasitoids by using experimentally manipulated communities of saproxylic beetles and parasitoid Hymenoptera as a model system. Classical approaches of species identification for saproxylic beetles were combined with DNA-barcoding for parasitoid Hymenoptera. The diversity of the host communities was inferred from their phylogenetic composition as well as differences in seven functional traits. Abundance, species richness, and Shannon-diversity of parasitoid Hymenoptera increased with increasing host abundance. However, the phylogenetic and functional dissimilarity of host communities showed no influence on the species communities of parasitoid Hymenoptera. The results clearly indicate an abundance-driven system in which the general availability, not necessarily the diversity of potential hosts, is decisive.
In summary, the present thesis corroborates the general importance of deadwood heterogeneity for the diversity of saproxylic species by combining different experimental approaches. In order to increase their efficiency, conservation strategies for saproxylic species should generally promote deadwood from different tree species under different conditions of sun exposure on landscape-level in addition to the present enrichment of a certain deadwood amount. The most effective combinations of tree species should consider broadleaved and coniferous as well as hard- and softwood tree species. Furthermore, in addition to dominant tree species, special attention should be given to native, subdominant, silviculturally unimportant, and rare tree species.
Das Zytokin Bone Morphogenetic Protein-2 (BMP-2) gehört als Mitglied der Transforming Growth Factor ß-Superfamilie zu einer großen Gruppe eng verwandter Wachstums- und Differenzierungsfaktoren. Es spielt eine entscheidende Rolle bei Bildung und Regeneration von Knorpel und Knochen und während verschiedener Prozesse der embryonalen Entwicklung. Durch Sezernierung des Proteins und anschließende Diffusion in der extrazellulären Matrix (EZM) ausgehend vom Ort der Sekretion unterliegt sein Wirkungsgrad einem abnehmenden Konzentrationsgradienten. BMP-2 bindet neben der hochaffinen Bindung an seinen spezifischen Rezeptor unter anderem auch an die extrazelluläre Matrix. So konnte in Vorarbeiten bereits durch Deletion der basischen Heparinbindungsstelle des BMP-2, die sich im N-terminalen Bereich befindet, eine Wirkungsverstärkung des Proteins in einem in vitro- Experiment, dem Hühnergliedmaßentest, erreicht werden, da die konkurrierende Bindung an Heparinbindungsstellen der EZM wegfällt. Im Tiermodell konnte jedoch ein genau umgekehrter Effekt dieser Mutante im Vergleich mit dem Wildtyp gezeigt werden, da in vivo die Diffusion des Moleküls durch Bindung an die EZM begrenzt und es so lokal an seinem Wirkungsort konzentriert wird. Von diesen Vorbefunden ausgehend war das Ziel der Arbeit die Klonierung und Expression von Mutanten des BMP-2, bei denen durch schrittweise Modifizierung der Heparinbindungsstelle die Bindung des Proteins an Heparin und deren Einfluß auf die Rezeptorbindung charakterisiert werden sollte. Dazu wurden zwei Mutanten des BMP-2 mit Verdopplung eines bzw. beider basischer Aminosäuretripletts kloniert, da diesem basischen Bereich im N-Terminus die eigentliche Bindung an Heparin zugeschrieben wird. Nach Expression, Renaturierung und säulenchromatographischer Aufreinigung der Proteine konnte in dieser Arbeit in drei verschiedenen funktionellen in vitro-Tests eine abnehmende Wirkung der Mutanten gezeigt werden. Neben dem biophysikalischen Nachweis der apparenten Affinitäten der Mutanten zu Rezeptor und Matrix in Biacore-Messungen konnte die Änderung des Wirkungsgrades auch in einem Zellkulturassay mit einer Maus-Fibroblasten-Zellinie durch Messung der Alkalischen Phosphatase und im Hühnergliedmaßentest gezeigt werden. In in vivo Experimenten bleibt eine entsprechende zu erwartende Wirkungsverstärkung dieser beiden Mutanten nachzuweisen, die im Hinblick auf einen therapeutischen Einsatz bei gewünschtem Ersatz zerstörten Knochens relevant werden könnte.
Biodiversity is in rapid decline worldwide. These declines are more pronounced in areas that are currently biodiversity rich, but economically poor – essentially describing many tropical regions in the Global South where landscapes are dominated by smallholder agriculture. Agriculture is an important driver of biodiversity decline, through habitat destruction and unsustainable practices. Ironically, agriculture itself is dependent on a range of ecosystem services, such as pollination and pest control, provided by biodiversity. Biodiversity on fields and the delivery of ecosystem services to crops is often closely tied to the composition of the surrounding landscape – complex landscapes with a higher proportion of (semi-)natural habitats tend to support a high abundances and biodiversity of pollinators and natural enemies that are beneficial to crop production. However, past landscape scale studies have focused primarily on industrialized agricultural landscapes in the Global North, and context dependent differences between regions and agricultural systems are understudied. Smallholder agriculture supports 2 billion people worldwide and contributes to over half the world’s food supply. Yet smallholders, particularly in sub-Saharan Africa, are underrepresented in research investigating the consequences of landscape change and agricultural practices. Where research in smallholder agriculture is conducted, the focus is often on commodity crops, such as cacao, and less on crops that are directly consumed by smallholder households, though the loss of services to these crops could potentially impact the most vulnerable farmers the hardest. Agroecology – a holistic and nature-based approach to agriculture, provides an alternative to unsustainable input-intensive agriculture. Agroecology has been found to benefit smallholders through improved agronomical and food-security outcomes. Co-benefits of agroecological practices with biodiversity and ecosystem services are assumed, but not often empirically tested. In addition, the local and landscape effects on biodiversity and ecosystem services are more commonly studied in isolation, but their potentially interactive effects are so far little explored. Our study region in northern Malawi exemplifies many challenges experienced by smallholder farmers throughout sub-Saharan Africa and more generally in the Global South. Malawi is located in a global biodiversity hotspot, but biodiversity is threatened by rapid habitat loss and a push for input-intensive agriculture by government and other stakeholders. In contrast, agroecology has been effectively promoted and implemented in the study region. We investigated how land-use differences and the agroecological practices affects biodiversity and ecosystem services of multiple taxa in a maize-bean intercropping system (Chapter 2), and pollination of pumpkin (Chapter 3) and pigeon pea (Chapter 4). Additionally, the effects of local and landscape scale shrub- to farmland habitat conversion was investigated on butterfly communities, as well as the potential for agroecology to mitigate these effects (Chapter 5).
Background
Landscape composition is known to affect both beneficial insect and pest communities on crop fields. Landscape composition therefore can impact ecosystem (dis)services provided by insects to crops. Though landscape effects on ecosystem service providers have been studied in large-scale agriculture in temperate regions, there is a lack of representation of tropical smallholder agriculture within this field of study, especially in sub-Sahara Africa. Legume crops can provide important food security and soil improvement benefits to vulnerable agriculturalists. However, legumes are dependent on pollinating insects, particularly bees (Hymenoptera: Apiformes) for production and are vulnerable to pests. We selected 10 pigeon pea (Fabaceae: Cajunus cajan (L.)) fields in Malawi with varying proportions of semi-natural habitat and agricultural area within a 1 km radius to study: (1) how the proportion of semi-natural habitat and agricultural area affects the abundance and richness of bees and abundance of florivorous blister beetles (Coleoptera: Melloidae), (2) if the proportion of flowers damaged and fruit set difference between open and bagged flowers are correlated with the proportion of semi-natural habitat or agricultural area and (3) if pigeon pea fruit set difference between open and bagged flowers in these landscapes was constrained by pest damage or improved by bee visitation.
Methods
We performed three, ten-minute, 15 m, transects per field to assess blister beetle abundance and bee abundance and richness. Bees were captured and identified to (morpho)species. We assessed the proportion of flowers damaged by beetles during the flowering period. We performed a pollinator and pest exclusion experiment on 15 plants per field to assess whether fruit set was pollinator limited or constrained by pests.
Results
In our study, bee abundance was higher in areas with proportionally more agricultural area surrounding the fields. This effect was mostly driven by an increase in honeybees. Bee richness and beetle abundances were not affected by landscape characteristics, nor was flower damage or fruit set difference between bagged and open flowers. We did not observe a positive effect of bee density or richness, nor a negative effect of florivory, on fruit set difference.
Discussion
In our study area, pigeon pea flowers relatively late—well into the dry season. This could explain why we observe higher densities of bees in areas dominated by agriculture rather than in areas with more semi-natural habitat where resources for bees during this time of the year are scarce. Therefore, late flowering legumes may be an important food resource for bees during a period of scarcity in the seasonal tropics. The differences in patterns between our study and those conducted in temperate regions highlight the need for landscape-scale studies in areas outside the temperate region.
Binding of proteins to DNA is usually considered 1D with one protein bound to one DNA molecule. In principle, proteins with multiple DNA binding domains could also bind to and thereby cross-link different DNA molecules. We have investigated this possibility using high-mobility group A1 (HMGA1) proteins, which are architectural elements of chromatin and are involved in the regulation of multiple DNA-dependent processes. Using direct stochastic optical reconstruction microscopy (dSTORM), we could show that overexpression of HMGA1a-eGFP in Cos-7 cells leads to chromatin aggregation. To investigate if HMGA1a is directly responsible for this chromatin compaction we developed a DNA cross-linking assay. We were able to show for the first time that HMGA1a can cross-link DNA directly. Detailed analysis using point mutated proteins revealed a novel DNA cross-linking domain. Electron microscopy indicates that HMGA1 proteins are able to create DNA loops and supercoils in linearized DNA confirming the cross-linking ability of HMGA1a. This capacity has profound implications for the spatial organization of DNA in the cell nucleus and suggests cross-linking activities for additional nuclear proteins.
HMGA1 Proteine sind kleine, basische, Nicht-Histon Proteine, die in Lösung keine Struktur aufweisen, durch drei AT-Haken, als DNA-Bindungsmotive, gekennzeichnet sind und präferentiell an die kleine Furche der DNA binden. Als differenziell exprimierte Architekturelemente des Chromatins erfüllen sie wichtige Funktionen bei der Regulation DNA abhängiger Prozesse in Zellen und während Entwicklungsprozessen. Aberrante Expressionen führen zu Entwicklungsdefekten und Krebs. In dieser Arbeit wurde der Einfluss von HMGA1 Proteinen auf die Organisation des Chromatins untersucht. Als Modell diente dabei zunächst die Differenzierung von C2C12 Muskelvorläuferzellen. Wie in einer früheren Arbeit gezeigt wurde, ist die Herunterregulation von HMGA1a essentiell für den Eintritt von C2C12 Zellen in die Myogenese. Eine konstante Überexpression von HMGA1a-eGFP hingegen verhindert die Muskeldifferenzierung durch Beeinflussung der Expression myogenesespezifischer Gene und Etablierung einer stabilen Chromatinstruktur. Wie in der vorliegenden Arbeit herausgefunden wurde, nimmt die differenzielle HMGA1a Expression nicht nur Einfluss auf die Expression muskelspezifischer Gene, sondern auch auf die globale Zusammensetzung des Chromatins durch eine reduzierte Expression von H1 Histonen und einer aberranten Expression von HMGB1, HMGN1 und HP1 Proteinen. HMGA1a wurde zusammen mit ORC Proteinen eine Funktion bei der Definition von Replikationsursprüngen in eukaryotischen Zellen zugesprochen. ORC Proteine wurden auch als Komponenten des Heterochromatins und als Interaktionspartner von HP1α identifiziert. Hier konnte mit Hilfe von Co-Immunpräzipitationen, Pull-down Assays und Verdrängungsexperimenten gezeigt werden, dass HMGA1 ein weiterer, direkter Interaktionspartner von ORC Proteinen im Heterochromatin ist und zusammen mit HP1α kooperiert. Pull-down-, Verdrängungs- und siRNA-Experimente zeigten zudem, dass HMGA1 zwar nicht direkt mit HP1α interagiert, die Kooperation der Proteine über ORC aber dennoch wichtig für die Aufrechterhaltung der Heterochromatinsstruktur ist. Damit erweisen sich HMGA1 Proteine als wichtige Stabilisierungsfaktoren des Heterochromatins. Bislang ging man davon aus, dass HMGA1 Moleküle linear, also eindimensional, an ein DNA Molekül binden. Das Vorhandensein von drei DNA-Bindungsmotiven und die eher struktur- als sequenzabhängige Bindung an die DNA lassen vermuten, dass HMGA1 Proteine auch gleichzeitig an benachbarte DNA-Stränge, also auch dreidimensional, binden könnten. Bekräftigt wurde diese Vermutung durch die Bildung von Chromatinaggregaten in Zellen die HMGA1a-eGFP überexprimierten. Dies wurde mittels konfokaler und hochauflösender Mikroskopie (dSTORM) analysiert. Um das Potential einer DNA-Quervernetzung durch HMGA1 Proteine nachzuweisen, wurde eine neue Methode entwickelt. Mit Hilfe eines neuartigen DNA Cross-linking Assays wurde nachgewiesen, dass HMGA1 Proteine in der Lage sind, zwei individuelle DNA Stränge zu vernetzen. Zudem wurde eine neue Domäne in HMGA1 entdeckt die maßgeblich zum Cross-linking beiträgt. Elektronenmikroskopische Analysen bestätigten, dass HMGA1 Proteine in der Lage sind Kreuzungen und Schleifen in DNA Molekülen zu erzeugen. Diese Ergebnisse unterstützen die Vermutung, dass HMGA1 Proteine im Zellkern ein DNA Gerüst bilden können, das Einfluss auf die zelltypische Chromatinorganisation nimmt und dadurch DNA abhängige Prozesse beeinflusst. In wie weit eine HMGA1 induzierte DNA Quervernetzung in vivo zum Beispiel in Chromozentren von C2C12 Zellen oder in Krebszellen, in denen HMGA1 Proteine stark überexprimiert sind, eine Rolle spielen, müssen künftige Untersuchungen zeigen. In dieser Arbeit konnte also gezeigt werden, dass HMGA1 Proteine die Chromatinstruktur auf drei Ebenen organisieren können: Durch Beeinflussung der Chromatinzusammensetzung durch Veränderung der Expression von Chromatinproteinen, durch Interaktion mit anderen Architekturelementen des Chromatins und durch Organisation eines potentiellen DNA Gerüsts.
Summary Myelin protein zero (P0) is a key myelin component in maintaining the integrity and functionality of the peripheral nervous system. Mutated variants are the cause for several disabilitating peripheral neuropathies such as Charcot-Marie-Tooth disease or Dejerine –Sotas syndrome. Using P0 knockout mice - a mouse model for these diseases - together with their wt counterparts on C57BL/6 background we studied the shaping of the T-cell repertoire specific for P0 in the presence and in the absence of this protein during the ontogeny of T-cells. Our approach was to use a series of overlapping 20-mer peptides covering the entire amino acid sequence of P0. This series of P0 peptides was employed for epitope mapping of the H2-Ab restricted T cell response. Thus, P0 peptide 5 (P0 41-60) in the extracellular domain of P0 was identified as the main immunogenic peptide. The immunogenic peptide containing the core immunodominant determinant in the P0 sequence was employed in studies of tolerance, revealing a highly reactive P0 specific T-cell repertoire in P0 ko mice while in wt mice the high avidity repertoire was inactivated in order to ensure self tolerance. In wild type and heterozygous P0 mice tolerance is not dependent on gene dosage. P0 is a tissue specific antigen whose expression is limited to myelinating Schwann cells. The classical view on tolerance to tissue specific antigens attributed this role to peripheral mechanisms. Driven by the finding that intrathymic expression of tissue-specific antigens is a common occurrence, we confirmed that “promiscuous” expression on thymic stroma holds true also for myelin P0. In addition, using bone marrow chimeras we investigated the capacity of bone marrow derived cells versus nonhematopoietic cells to induce tolerance towards P0. Our findings show that bone marrow derived cells although tolerogenic to some degree are not sufficient to mediate complete tolerance. P0 expression on cells with origin other than bone marrow showed to be sufficient and necessary to induce sound tolerance. We identified one cryptic (P0 peptide 8) and two subdominant epitopes (P0 petides 1, and 3). P0 peptide 8 was reactive in both wt and P0 ko mice. Peptides 1 and 3 were immunogenic in P0 ko but not in wt mice. Several P0 peptides including the immunogenic peptide 5 were involved in direct and adoptive transfer EAN studies. None of them induced clinical signs of EAN. Immunization with P0 peptide 3 did induce inflammation of the peripheral nerves reflected by the infiltration of macrophages and CD3 positive cells. More studies involving highly P0 specific T-cell lines are needed to characterize the P0 induced EAN. Our findings may have direct implications for secondary autoimmunity and inflammation in peripheral nerves developing after correcting the P0 genetic defect by gene therapy in aforementioned diseases.
Among the Microbacteriaceae the species of Subtercola and Agreia form closely associated clusters. Phylogenetic analysis demonstrated three major phylogenetic branches of these species. One of these branches contains the two psychrophilic species Subtercola frigoramans and Subtercola vilae, together with a larger number of isolates from various cold environments. Genomic evidence supports the separation of Agreia and Subtercola species. In order to gain insight into the ability of S. vilae to adapt to life in this extreme environment, we analyzed the genome with a particular focus on properties related to possible adaptation to a cold environment. General properties of the genome are presented, including carbon and energy metabolism, as well as secondary metabolite production. The repertoire of genes in the genome of S. vilae DB165\(^T\) linked to adaptations to the harsh conditions found in Llullaillaco Volcano Lake includes several mechanisms to transcribe proteins under low temperatures, such as a high number of tRNAs and cold shock proteins. In addition, S. vilae DB165\(^T\) is capable of producing a number of proteins to cope with oxidative stress, which is of particular relevance at low temperature environments, in which reactive oxygen species are more abundant. Most important, it obtains capacities to produce cryo-protectants, and to combat against ice crystal formation, it produces ice-binding proteins. Two new ice-binding proteins were identified which are unique to S. vilae DB165\(^T\). These results indicate that S. vilae has the capacity to employ different mechanisms to live under the extreme and cold conditions prevalent in Llullaillaco Volcano Lake.
Temperature and photoperiod are important Zeitgebers for plants and pollinators to synchronize growth and reproduction with suitable environmental conditions and their mutualistic interaction partners. Global warming can disturb this temporal synchronization since interacting species may respond differently to new combinations of photoperiod and temperature under future climates, but experimental studies on the potential phenological responses of plants and pollinators are lacking. We simulated current and future combinations of temperature and photoperiod to assess effects on the overwintering and spring phenology of an early flowering plant species (Crocus sieberi) and the Western honey bee (Apis mellifera). We could show that increased mean temperatures in winter and early spring advanced the flowering phenology of C. sieberi and intensified brood rearing activity of A. mellifera but did not advance their brood rearing activity. Flowering phenology of C. sieberi also relied on photoperiod, while brood rearing activity of A. mellifera did not. The results confirm that increases in temperature can induce changes in phenological responses and suggest that photoperiod can also play a critical role in these responses, with currently unknown consequences for real-world ecosystems in a warming climate.
Disturbances alter biodiversity via their specific characteristics, including severity and extent in the landscape, which act at different temporal and spatial scales. Biodiversity response to disturbance also depends on the community characteristics and habitat requirements of species. Untangling the mechanistic interplay of these factors has guided disturbance ecology for decades, generating mixed scientific evidence of biodiversity responses to disturbance. Understanding the impact of natural disturbances on biodiversity is increasingly important due to human‐induced changes in natural disturbance regimes. In many areas, major natural forest disturbances, such as wildfires, windstorms, and insect outbreaks, are becoming more frequent, intense, severe, and widespread due to climate change and land‐use change. Conversely, the suppression of natural disturbances threatens disturbance‐dependent biota. Using a meta‐analytic approach, we analysed a global data set (with most sampling concentrated in temperate and boreal secondary forests) of species assemblages of 26 taxonomic groups, including plants, animals, and fungi collected from forests affected by wildfires, windstorms, and insect outbreaks. The overall effect of natural disturbances on α‐diversity did not differ significantly from zero, but some taxonomic groups responded positively to disturbance, while others tended to respond negatively. Disturbance was beneficial for taxonomic groups preferring conditions associated with open canopies (e.g. hymenopterans and hoverflies), whereas ground‐dwelling groups and/or groups typically associated with shady conditions (e.g. epigeic lichens and mycorrhizal fungi) were more likely to be negatively impacted by disturbance. Across all taxonomic groups, the highest α‐diversity in disturbed forest patches occurred under moderate disturbance severity, i.e. with approximately 55% of trees killed by disturbance. We further extended our meta‐analysis by applying a unified diversity concept based on Hill numbers to estimate α‐diversity changes in different taxonomic groups across a gradient of disturbance severity measured at the stand scale and incorporating other disturbance features. We found that disturbance severity negatively affected diversity for Hill number q = 0 but not for q = 1 and q = 2, indicating that diversity–disturbance relationships are shaped by species relative abundances. Our synthesis of α‐diversity was extended by a synthesis of disturbance‐induced change in species assemblages, and revealed that disturbance changes the β‐diversity of multiple taxonomic groups, including some groups that were not affected at the α‐diversity level (birds and woody plants). Finally, we used mixed rarefaction/extrapolation to estimate biodiversity change as a function of the proportion of forests that were disturbed, i.e. the disturbance extent measured at the landscape scale. The comparison of intact and naturally disturbed forests revealed that both types of forests provide habitat for unique species assemblages, whereas species diversity in the mixture of disturbed and undisturbed forests peaked at intermediate values of disturbance extent in the simulated landscape. Hence, the relationship between α‐diversity and disturbance severity in disturbed forest stands was strikingly similar to the relationship between species richness and disturbance extent in a landscape consisting of both disturbed and undisturbed forest habitats. This result suggests that both moderate disturbance severity and moderate disturbance extent support the highest levels of biodiversity in contemporary forest landscapes.
Mycotoxins in agriculturally used plants can cause intoxication in animals and can lead to severe financial losses for farmers. The endophytic fungus Epichloë festucae var. lolii living symbiotically within the cool season grass species Lolium perenne can produce vertebrate and invertebrate toxic alkaloids. Hence, an exact quantitation of alkaloid concentrations is essential to determine intoxication risk for animals. Many studies use different methods to detect alkaloid concentrations, which complicates the comparability. In this study, we showed that alkaloid concentrations of individual plants exceeded toxicity thresholds on real world grasslands in Germany, but not on the population level. Alkaloid concentrations on five German grasslands with high alkaloid levels peaked in summer but were also below toxicity thresholds on population level. Furthermore, we showed that alkaloid concentrations follow the same seasonal trend, regardless of whether plant fresh or dry weight was used, in the field and in a common garden study. However, alkaloid concentrations were around three times higher when detected with dry weight. Finally, we showed that alkaloid concentrations can additionally be biased to different alkaloid detection methods. We highlight that toxicity risks should be analyzed using plant dry weight, but concentration trends of fresh weight are reliable.
Endophytes live in partial symbiosis inside a plant and have been detected in all tested plants. They belong to the group of fungi or bacteria and their ecological function is mostly unknown. The fungal endophytes of the genus Epichloë belong to a special group of endophytes. Epichloë endophytes live symbiotically inside cool season grass species and some of them are able to produce alkaloids toxic to vertebrates and insects. Their symbiosis is seen as mutualistic for the following reasons: the fungus provides the plant herbivore resistance by producing alkaloids, and it increases the plant’s drought tolerance as well as its biomass production. In return, the grass provides the fungus shelter, nutrients and dispersal. Epichloë endophytes are host specific and the ability to produce alkaloids differs between species. In order to estimate intoxication risks in grasslands, it is necessary to detect infection rates of different grass species with Epichloë endophytes, and to determine the genotypes and chemotypes of the Epichloë species as well as the produced alkaloid concentrations. Factors like land-use intensity or season may have an influence on infection rates and alkaloid concentrations. Also, different methodological approaches may lead to different results. In this doctoral thesis my general aim was to evaluate intoxication risks in German grasslands caused by Epichloë endophytes. For that I investigated infection rates of different grass species and the genotypes and chemotypes of their Epichloë endophytes in German grasslands (Chapter II). Furthermore, I compared alkaloid concentrations detected with dry and fresh plant weight and different analytical methods. I also detected possible changes on the influence of season or land-use intensity (Chapter III). Additionally, I examined infections with Epichloë endophytes and alkaloid concentrations in commercially available grass seed mixtures and determined how that influences the intoxication risk of grazing animals in Europe (Chapter IV).
It is of agricultural interest to estimate intoxication risks for grazing livestock on German grasslands due to Epichloë infected grass species. Therefore, it is important to investigate which grasses are infected with the Epichloë endophyte, if the endophytes have the ability to produce vertebrate and invertebrate toxic alkaloids and if the alkaloids are indeed produced. I showed that Epichloë festucae var. lolii infecting agriculturally important Lolium perenne lacked the starting gene for ergovaline biosynthesis. Hence, vertebrate toxic ergovaline was not detected in the majority of the collected L. perenne plants. The detection of alkaloid concentrations is an important tool to estimate intoxication risk for vertebrates, but also invertebrates. My studies showed that the usage of dry plant material is crucial to quantify the correct alkaloid concentrations, and that alkaloid concentrations can vary depending on the detection method. Hence, the usage of validated, similar detection methods is important to be able to compare alkaloid concentrations from different studies. Nevertheless, the trends of seasonal changes and the influence of land-use intensity stayed the same, regardless if dry or fresh plant weight was used. Also, alkaloid concentrations were below toxicity thresholds on population level, regardless of the method used. Two commercially available forage grass and two commercially available turf grass seed mixtures were infected with Epichloë endopyhtes and alkaloids were detected. This might contribute to the spreading of Epichloë endopyhtes in Germany, therefore seed mixtures should be tested for Epichloë infections. My results indicate that the intoxication risk is generally low in Germany at the moment, although that might change due to climate change, an increase of monocultural land-use, or the seeding of Epichloë infected grass seeds.
Obesity is a major risk factor predisposing to the development of peripheral insulin resistance and type 2 diabetes (T2D). Elevated food intake and/or decreased energy expenditure promotes body weight gain and acquisition of adipose tissue. Number of studies implicated phospholipase D (PLD) enzymes and their product, phosphatidic acid (PA), in regulation of signaling cascades controlling energy intake, energy dissipation and metabolic homeostasis. However, the impact of PLD enzymes on regulation of metabolism has not been directly determined so far. In this study we utilized mice deficient for two major PLD isoforms, PLD1 and PLD2, to assess the impact of these enzymes on regulation of metabolic homeostasis. We showed that mice lacking PLD1 or PLD2 consume more food than corresponding control animals. Moreover, mice deficient for PLD2, but not PLD1, present reduced energy expenditure. In addition, deletion of either of the PLD enzymes resulted in development of elevated body weight and increased adipose tissue content in aged animals. Consistent with the fact that elevated content of adipose tissue predisposes to the development of hyperlipidemia and insulin resistance, characteristic for the pre-diabetic state, we observed that Pld1\(^{-/-}\) and Pld2\(^{-/-}\) mice present elevated free fatty acids (FFA) levels and are insulin as well as glucose intolerant. In conclusion, our data suggest that deficiency of PLD1 or PLD2 activity promotes development of overweight and diabetes.
Cryptochromes are conserved flavoprotein receptors found throughout the biological kingdom with diversified roles in plant development and entrainment of the circadian clock in animals. Light perception is proposed to occur through flavin radical formation that correlates with biological activity in vivo in both plants and Drosophila. By contrast, mammalian (Type II) cryptochromes regulate the circadian clock independently of light, raising the fundamental question of whether mammalian cryptochromes have evolved entirely distinct signaling mechanisms. Here we show by developmental and transcriptome analysis that Homo sapiens cryptochrome - 1 (HsCRY1) confers biological activity in transgenic expressing Drosophila in darkness, that can in some cases be further stimulated by light. In contrast to all other cryptochromes, purified recombinant HsCRY1 protein was stably isolated in the anionic radical flavin state, containing only a small proportion of oxidized flavin which could be reduced by illumination. We conclude that animal Type I and Type II cryptochromes may both have signaling mechanisms involving formation of a flavin radical signaling state, and that light independent activity of Type II cryptochromes is a consequence of dark accumulation of this redox form in vivo rather than of a fundamental difference in signaling mechanism.
no abstract available
The identification of biomarker signatures is important for cancer diagnosis and prognosis. However, the detection of clinical reliable signatures is influenced by limited data availability, which may restrict statistical power. Moreover, methods for integration of large sample cohorts and signature identification are limited. We present a step-by-step computational protocol for functional gene expression analysis and the identification of diagnostic and prognostic signatures by combining meta-analysis with machine learning and survival analysis. The novelty of the toolbox lies in its all-in-one functionality, generic design, and modularity. It is exemplified for lung cancer, including a comprehensive evaluation using different validation strategies. However, the protocol is not restricted to specific disease types and can therefore be used by a broad community. The accompanying R package vignette runs in ~1 h and describes the workflow in detail for use by researchers with limited bioinformatics training.
In our analysis I was interested in the gene duplications, with focus on in-paralogs. In-paralogs are gene duplicates which arose after species split. Here I analysed the in-paralogs quantitatively, as well as qualitatively. For quantitative analysis genomes of 21 species were taken. Most of them have vastly different lifestyles with maximum evolutionary distance between them 1100 million years. Species included mammals, fish, insects and worm, plus some other chordates. All the species were pairwised analysed by the Inparanoid software, and in-paralogs matrix were built representing number of in-paralogs in all vs. all manner. Based on the in-paralogs matrix I tried to reconstruct the evolutionary tree using in-paralog numbers as evolutionary distance. If all 21 species were used the resulting tree was very far from real one: a lot of species were misplaced. However if the number was reduced to 12, all of the species were placed correctly with only difference being wrong insect and fish clusters switched. Then to in-paralogs matrix the neighbour-net algorithm was applied. The resulting "net" tree showed the species with fast or slow duplications rates compared to the others. We could identify species with very high or very low duplications frequencies and it correlates with known occurrences of the whole genome duplications. As the next step I built the graphs for every single species showing the correlation between their in-paralogs number and evolutionary distance. As we have 21 species, graph for every species is built using 20 points. Coordinates of the points are set using the evolutionary distance to that particular species and in-paralogs number. In mammals with increasing the distance from speciation the in-paralogs number also increased, however not in linear fashion. In fish and insects the graph close to zero is just the same in mammals' case. However, after reaching the evolutionary distances more than 800 million years the number of inparalogs is beginning to decrease. We also made a simulation of gene duplications for all 21 species and all the splits according to the fossil and molecular clock data from literature. In our simulation duplication frequency was minimal closer to the past and maximum in the near-present time. Resulting curves had the same shape the experimental data ones. In case of fish and insect for simulation the duplication rate coefficient even had to be set negative in order to repeat experimental curve shape. To the duplication rate coefficient in our simulation contribute 2 criteria: gene duplications and gene losses. As gene duplication is stochastical process it should always be a constant. So the changing in the coefficient should be solely explained by the increasing gene loss of old genes. The processes are explained by the evolution model with high gene duplication and loss ratio. The drop in number of in-paralogs is probably due to the BLAST algorithm. It is observed in comparing highly divergent species and BLAST cannot find the orthologs so precisely anymore. In the second part of my work I concentrated more on the specific function of inparalogs. Because such analysis is time-consuming it could be done on the limited number species. Here I used three insects: Drosophila melanogaster (fruit y), Anopheles gambiae (mosquito) and Apis mellifera (honeybee). After Inparnoid analyses and I listed the cluster of orthologs. Functional analyses of all listed genes were done using GO annotations and also KEGG PATHWAY database. We found, that the gene duplication pattern is unique for each species and that this uniqueness is rejected through the differences in functional classes of duplicated genes. The preferences for some classes reject the evolutionary trends of the last 350 million years and allow assumptions on the role of those genes duplications in the lifestyle of species. Furthermore, the observed gene duplications allowed me to find connections between genomic changes and their phenotypic manifestations. For example I found duplications within carbohydrate metabolism rejecting feed pattern adaptation, within photo- and olfactory-receptors indicating sensing adaptation and within troponin indicating adaptations in the development. Despite these species specific differences, found high correlations between the independently duplicated genes between the species. This might hint for a "pool" of genes preferentially duplicated. Taken together, the observed duplication patterns reject the adaptational process and provide us another link to the field of genomic zoology.
Background
Renal cell carcinoma (RCC) is marked by high mortality rate. To date, no robust risk stratification by clinical or molecular prognosticators of cancer-specific survival (CSS) has been established for early stages. Transcriptional profiling of small non-coding RNA gene products (miRNAs) seems promising for prognostic stratification. The expression of miR-21 and miR-126 was analysed in a large cohort of RCC patients; a combined risk score (CRS)-model was constructed based on expression levels of both miRNAs.
Methods
Expression of miR-21 and miR-126 was evaluated by qRT-PCR in tumour and adjacent non-neoplastic tissue in n = 139 clear cell RCC patients. Relation of miR-21 and miR-126 expression with various clinical parameters was assessed. Parameters were analysed by uni- and multivariate COX regression. A factor derived from the z-score resulting from the COX model was determined for both miRs separately and a combined risk score (CRS) was calculated multiplying the relative expression of miR-21 and miR-126 by this factor. The best fitting COX model was selected by relative goodness-of-fit with the Akaike information criterion (AIC).
Results
RCC with and without miR-21 up- and miR-126 downregulation differed significantly in synchronous metastatic status and CSS. Upregulation of miR-21 and downregulation of miR-126 were independently prognostic. A combined risk score (CRS) based on the expression of both miRs showed high sensitivity and specificity in predicting CSS and prediction was independent from any other clinico-pathological parameter. Association of CRS with CSS was successfully validated in a testing cohort containing patients with high and low risk for progressive disease.
Conclusions
A combined expression level of miR-21 and miR-126 accurately predicted CSS in two independent RCC cohorts and seems feasible for clinical application in assessing prognosis.
Clear cell renal cell carcinoma (ccRCC) characterized by a tumor thrombus (TT) extending into the inferior vena cava (IVC) generally indicates poor prognosis. Nevertheless, the risk for tumor recurrence after nephrectomy and thrombectomy varies. An applicable and accurate prediction system to select ccRCC patients with TT of the IVC (ccRCC/TT) at high risk after nephrectomy is urgently needed, but has not been established up to now. To our knowledge, a possible role of microRNAs (miRs) for the development of ccRCC/TT or their impact as prognostic markers in ccRCC/TT has not been explored yet. Therefore, we analyzed the expression of the previously described onco-miRs miR-200c, miR-210, miR-126, miR-221, let-7b, miR-21, miR-143 and miR-141 in a study collective of 74 ccRCC patients. Using the expression profiles of these eight miRs we developed classification systems that accurately differentiate ccRCC from non-cancerous renal tissue and ccRCC/TT from tumors without TT. In the subgroup of 37 ccRCC/TT cases we found that miR-21, miR-126, and miR-221 predicted cancer related death (CRD) accurately and independently from other clinico-pathological features. Furthermore, a combined risk score based on the expression of miR-21, miR-126 and miR-221 was developed and showed high sensitivity and specificity to predict cancer specific survival (CSS) in ccRCC/TT. Using the combined risk score we were able to classify ccRCC/TT patients correctly into high and low risk cases. The risk stratification by the combined risk score (CRS) will benefit from further cohort validation and might have potential for clinical application as a molecular prediction system to identify high- risk ccRCC/TT patients.
Nectar is crucial to maintain plant-pollinator mutualism. Nectar quality (nutritional composition) can vary strongly between individuals of the same plant species. The factors driving such inter-individual variation have however not been investigated closer. We investigated nectar quality of field scabious, Knautia arvensis in different grassland plant communities varying in species composition and richness to assess whether nectar quality can be affected by the surrounding plant community. We analyzed (with high performance liquid chromatography) the content of carbohydrates, overall amino acids, and essential amino acids. Amino acid and carbohydrate concentrations and proportions varied among plant individuals and with the surrounding plant community but were not related to the surrounding plant species richness. Total and individual carbohydrate concentrations were lowest, while proportions of the essential amino acids, valine, isoleucine, leucine (all phagostimulatory), and lysine were highest in plant species communities of the highest diversity. Our results show that K. arvensis nectar chemistry varies with the composition of the surrounding plant community, which may alter the taste and nutritional value and thus affect the plant’s visitor spectrum and visitation rate. However, the strong inter-individual variation in nectar quality requires additional studies (e.g., in semi-field studies) to disentangle different biotic and abiotic factors contributing to inter-individual nectar chemistry in a plant-community context.
Floral nectar is considered the most important floral reward for attracting pollinators. It contains large amounts of carbohydrates besides variable concentrations of amino acids and thus represents an important food source for many pollinators. Its nutrient content and composition can, however, strongly vary within and between plant species. The factors driving this variation in nectar quality are still largely unclear.
We investigated factors underlying interspecific variation in macronutrient composition of floral nectar in 34 different grassland plant species. Specifically, we tested for correlations between the phylogenetic relatedness and morphology of plants and the carbohydrate (C) and total amino acid (AA) composition and C:AA ratios of nectar.
We found that compositions of carbohydrates and (essential) amino acids as well as C:AA ratios in nectar varied significantly within and between plant species. They showed no clear phylogenetic signal. Moreover, variation in carbohydrate composition was related to family‐specific structural characteristics and combinations of morphological traits. Plants with nectar‐exposing flowers, bowl‐ or parabolic‐shaped flowers, as often found in the Apiaceae and Asteraceae, had nectar with higher proportions of hexoses, indicating a selective pressure to decelerate evaporation by increasing nectar osmolality.
Our study suggests that variation in nectar nutrient composition is, among others, affected by family‐specific combinations of morphological traits. However, even within species, variation in nectar quality is high. As nectar quality can strongly affect visitation patterns of pollinators and thus pollination success, this intra‐ and interspecific variation requires more studies to fully elucidate the underlying causes and the consequences for pollinator behaviour.
Accumulating evidences have assigned a central role to parasite-derived proteins in immunomodulation. Here, we report on the proteomic identification and characterization of immunomodulatory excretory-secretory (ES) products from the metacestode larva (tetrathyridium) of the tapeworm Mesocestoides corti (syn. M. vogae). We demonstrate that ES products but not larval homogenates inhibit the stimuli-driven release of the pro-inflammatory, Th1-inducing cytokine IL-12p70 by murine bone marrow-derived dendritic cells (BMDCs). Within the ES fraction, we biochemically narrowed down the immunosuppressive activity to glycoproteins since active components were lipid-free, but sensitive to heat- and carbohydrate-treatment. Finally, using bioassay-guided chromatographic analyses assisted by comparative proteomics of active and inactive fractions of the ES products, we defined a comprehensive list of candidate proteins released by M. corti tetrathyridia as potential suppressors of DC functions. Our study provides a comprehensive library of somatic and ES products and highlight some candidate parasite factors that might drive the subversion of DC functions to facilitate the persistence of M. corti tetrathyridia in their hosts.
The purification and the amino acid sequence of a proteolipid translated on ribosomes in yeast mitochondria is reported. This protein, which is a subunit of the A TP synthase, was purified by extraction with chloroform/methanol (2/1) and subsequent chromatography on phosphocellulose and reverse phase h.p.l.c. A mol. wt. of 5500 was estimated by chromatography on Bio-Gel P-30 in 8011/o fonnie acid. The complete amino acid sequence of this protein was determined by automated solid phase Edman degradation of the whole protein and of fragments obtained after cleavage with cyanogen bromide. The sequence analysis indicates a length of 48 amino acid residues. The calculated mol. wt. of 5870 corresponds to the value found by gel chromatography. This polypeptide contains three basic residues and no negatively charged side chain. The three basic residues are clustered at the C terminus. The primary structure of this protein is in full agreement with the predicted amino acid sequence of the putative polypeptide encoded by the mitochondrial aap1 gene recently discovered in Saccharomyces cerevisiae. Moreover, this protein shows 5011/o homology with the amino acid sequence of a putative polypeptide encoded by an unidentified reading frame also discovered near the mitochondrial ATPase subunit 6 genein Aspergillus nidulans.
A cascade of histone acetylation events with subsequent incorporation of a histone H2A variant plays an essential part in transcription regulation in various model organisms. A key player in this cascade is the chromatin remodelling complex SWR1, which replaces the canonical histone H2A with its variant H2A.Z. Transcriptional regulation of polycistronic transcription units in the unicellular parasite Trypanosoma brucei has been shown to be highly dependent on acetylation of H2A.Z, which is mediated by the histone-acetyltransferase HAT2. The chromatin remodelling complex which mediates H2A.Z incorporation is not known and an SWR1 orthologue in trypanosomes has not yet been reported. In this study, we identified and characterised an SWR1-like remodeller complex in T. brucei that is responsible for Pol II-dependent transcriptional regulation. Bioinformatic analysis of potential SNF2 DEAD/Box helicases, the key component of SWR1 complexes, identified a 1211 amino acids-long protein that exhibits key structural characteristics of the SWR1 subfamily. Systematic protein-protein interaction analysis revealed the existence of a novel complex exhibiting key features of an SWR1-like chromatin remodeller. RNAi-mediated depletion of the ATPase subunit of this complex resulted in a significant reduction of H2A.Z incorporation at transcription start sites and a subsequent decrease of steady-state mRNA levels. Furthermore, depletion of SWR1 and RNA-polymerase II (Pol II) caused massive chromatin condensation. The potential function of several proteins associated with the SWR1-like complex and with HAT2, the key factor of H2A.Z incorporation, is discussed.
New insights into the histone variant H2A.Z incorporation pathway in \(Trypanosoma\) \(brucei\)
(2022)
The histone variant H2A.Z is a key player in transcription regulation in eukaryotes. Histone acetylations by the NuA4/TIP60 complex are required to enable proper incorporation of the histone variant and to promote the recruitment of other complexes and proteins required for transcription initiation. The second key player in H2A.Z-mediated transcription is the chromatin remodelling complex SWR1, which replaces the canonical histone H2A with its variant. By the time this project started little was known about H2A.Z in the unicellular parasite Trypanosoma brucei. Like in other eukaryotes H2A.Z was exclusively found in the transcription start sites of the polycistronic transcription units where it keeps the chromatin in an open conformation to enable RNA-polymerase II-mediated transcription. Previous studies showed the variant colocalizing with an acetylation of lysine on histone H4 and a methylation of lysine 4 on histone H3. Data indicated that HAT2 is linked to H2A.Z since it is required for acetylation of lyinse 10 on histone H4. A SWR1-like complex and a complex homologous to the NuA4/TIP60 could not be identified yet. This study aimed at identifying a SWR1-like remodelling complex in T. brucei and at identifying a protein complex orthologous to NuA4/TIP60 as well as at answering the question whether HAT2 is part of this complex or not. To this end, I performed multiple mass spectrometry-coupled co-Immunoprecipitation assays with potential subunits of a SWR1 complex, HAT2 and a putative homolog of a NuA4/TIP60 subunit. In the course of these experiments, I was able to identify the TbSWR1 complex. Subsequent cell fractionation and chromatin immunoprecipitation-coupled sequencing analysis experiments confirmed, that this complex is responsible for the incorporation of the histone variant H2A.Z in T. brucei. In addition to this chromatin remodelling complex, I was also able to identify two histone acetyltransferase complexes assembled around HAT1 and HAT2. In the course of my study data were published by the research group of Nicolai Siegel that identified the histone acetyltransferase HAT2 as being responsible for histone H4 acetylation, in preparation to promote H2A.Z incorporation. The data also indicated that HAT1 is responsible for acetylation of H2A.Z. According to the literature, this acetylation is required for proper transcription initiation. Experimental data generated in this study indicated, that H2A.Z and therefore TbSWR1 is involved in the DNA double strand break response of T. brucei. The identification of the specific complex composition of all three complexes provided some hints about how they could interact with each other in the course of transcription regulation and the DNA double strand break response. A proximity labelling approach performed with one of the subunits of the TbSWR1 complex identified multiple transcription factors, PTM writers and proteins potentially involved in chromatin maintenance. Overall, this work will provide some interesting insights about the composition of the complexes involved in H2A.Z incorporation in T. brucei. Furthermore, it is providing valuable information to set up experiments that could shed some light on RNA-polymerase II-mediated transcription and chromatin remodelling in T. brucei in particular and Kinetoplastids in general.
Insects inhabiting the temperate zones measure seasonal changes in day or night length to enter the overwintering diapause. Diapause induction occurs after the duration of the night exceeds a critical night length (CNL). Our understanding of the time measurement mechanisms is continuously evolving subsequent to Bünning’s proposal that circadian systems play the clock role in photoperiodic time measurement (Bünning, 1936). Initially, the photoperiodic clocks were considered to be either based on circadian oscillators or on simple hour-glasses, depending on ‘positive’ or ‘negative’ responses in Nanda–Hamner and Bünsow experiments (Nanda & Hammer, 1958; Bünsow, 1960).
However, there are also species whose responses can be regarded as neither ‘positive’, nor as ‘negative’, such as the Northern Drosophila species Drosophila ezoana, which is investigated in the present study. In addition, modelling efforts show that the ‘positive’ and ‘negative’ Nanda–Hamner responses can also be provoked by circadian oscillators that are damped to different degrees: animals with highly sustained circadian clocks will respond ‘positive’ and those with heavily damped circadian clocks will respond ‘negative’. In the present study, an experimental assay is proposed that characterizes the photoperiodic oscillators by determining the effects of non-24-h light/dark cycles (T-cycles) on critical night length. It is predicted that there is (i) a change in the critical night length as a function of T-cycle period in sustained-oscillator-based clocks and (ii) a fxed night-length measurement (i.e. no change in critical night length) in damped-oscillator-based clocks. Drosophila ezoana flies show a critical night length of approximately 7 h irrespective of T-cycle period, suggesting a damped-oscillator-based photoperiodic clock. The conclusion is strengthened by activity recordings revealing that the activity rhythm of D. ezoana flies also dampens in constant darkness.
Cord blood hematopoietic stem cells (CB-HSCs) are an outstanding source for the treatment of a variety of malignant and non-malignant disorders. However, the low amount of cells collected per donor is often insufficient for treatment of adult patients. In order to make sufficient numbers of CB-HSCs available for adults, expansion is required. Different approaches were described for HSC expansion, however these approaches are impeded by the loss of engrafting potential during ex vivo culture. Little is known about the underlying molecular mechanisms. Epigenetic mechanisms play essential roles in controlling stem cell potential and fate decisions and epigenetic strategies are considered for HSC expansion. Therefore, this study aimed to characterize global and local epigenotypes during the expansion of human CB-CD34+, a well established CB progenitor cell type, to better understand the molecular mechanisms leading to the culture-associated loss of engrafting potential. Human CB-CD34+ cells were cultured using 2 different cytokine cocktails: the STF cocktail containing SCF, TPO, FGF-1 and the STFIA cocktail, which combines STF with Angiopoietin-like 5 (Angptl5) and Insulin-like growth factor-binding protein 2 (IGFBP2). The latter expands CB-HSCs ex vivo. Subsequently, the NOD-scid gamma (NSG) mouse model was used to study the engraftment potential of expanded cells. Engraftment potential achieved by fresh CB-CD34+ cells was maintained when CB-CD34+ cells were expanded under STFIA but not under STF conditions. To explore global chromatin changes in freshly isolated and expanded CB-CD34+ cells, levels of the activating H3K4me3 and the repressive H3K27me3 histone marks were determined by chromatin flow cytometry and Western blot analyses. For analysis of genome-wide chromatin changes following ex vivo expansion, transcriptome profiling by microarray and chromatin immunoprecipitation combined with deep sequencing (ChIP-seq) were performed. Additionally, local chromatin transitions were monitored by ChIP analyses on promoter regions of developmental and self-renewal factors. On a global level, freshly isolated CD34+ and CD34- cells differed in H3K4me3 and H3K27me3 levels. After 7 days of expansion, CD34+ and CD34- cells adopted similar levels of active and repressive marks. Expanding the cells without IGFBP2 and Angptl5 led to a higher global H3K27me3 level. ChIP-seq analyses revealed a cytokine cocktail-dependent redistribution of H3K27me3 profiles. Chemical inhibition of the H3K27 methyltransferase EZH2 counteracted the culture-associated loss of NSG engraftment potential. Collectively, the data presented in this study revealed that by adding epigeneticly active compounds in the culture media we observed changes on a chromatin level which counteracted the loss of engraftment potential. H3K27me3 rather than H3K4me3 may be critical to establish a specific engraftment supporting transcriptional program. Furthermore, I identified a critical function for the Polycomb repressive complex 2-component EZH2 in the loss of engraftment potential during the in vitro expansion of HPSCs. Taken together this thesis provides a better molecular understanding of chromatin changes upon expansion of CB-HSPCs and opens up new perspectives for epigenetic ex vivo expansion strategies.
1. Pollination services of cacao are crucial for global chocolate production, yet remain critically understudied, particularly in regions of origin of the species. Notably, uncertainties remain concerning the identity of cacao pollinators, the influence of landscape (forest distance) and management (shade cover) on flower visitation and the role of pollen deposition in limiting fruit set.
2. Here, we aimed to improve understanding of cacao pollination by studying limiting factors of fruit set in Peru, part of the centre of origin of cacao. Flower visitors were sampled with sticky insect glue in 20 cacao agroforests in two biogeographically distinct regions of Peru, across gradients of shade cover and forest distance. Further, we assessed pollen quantities and compared fruit set between naturally and manually pollinated flowers.
3. The most abundant flower visitors were aphids, ants and thrips in the north and thrips, midges and parasitoid wasps in the south of Peru. We present some evidence of increasing visitation rates from medium to high shade (40%–95% canopy closure) in the dry north, and opposite patterns in the semi-humid south, during the wet season.
4. Natural pollination resulted in remarkably low fruit set rates (2%), and very low pollen deposition. After hand pollination, fruit set more than tripled (7%), but was still low.
5. The diversity and high relative abundances of herbivore flower visitors limit our ability to draw conclusions on the functional role of different flower visitors. The remarkably low fruit set of naturally and even hand pollinated flowers indicates that other unaddressed factors limit cacao fruit production. Such factors could be, amongst others, a lack of effective pollinators, genetic incompatibility or resource limitation. Revealing efficient pollinator species and other causes of low fruit set rates is therefore key to establish location-specific management strategies and develop high yielding native cacao agroforestry systems in regions of origin of cacao
Chapter I – Introduction
Global trade of beans of the cacao tree (Theobroma cacao), of which chocolate is produced, contributes to the livelihoods of millions of smallholder farmers. The understorey tree is native to South America but is nowadays cultivated in many tropical regions. In Peru, a South American country with a particularly high cacao diversity, it is common to find the tree cultivated alongside non-crop trees that provide shade, in so-called agroforestry systems. Because of the small scale and low management intensity of such systems, agroforestry is one of the most wildlife-friendly land-use types, harbouring the potential for species conservation. Studying wildlife-friendly land-use is of special importance for species conservation in biodiversity-rich tropical regions such as Peru, where agricultural expansion and intensification are threatening biodiversity. Moreover, there is a growing body of evidence that shows co-occurrence of high biodiversity levels and high yield in wildlife-friendly cacao farming. Yet studies are restricted to non-native cacao countries, and since patterns might be different among continents, it is important to improve knowledge on wildlife-friendly agroforestry in native countries.
Because studies of wildlife-friendly cultivation processes are still largely lacking for South America, we set out to study multiple aspects of cacao productivity in agroforests in Peru, part of cacao´s region of origin. The natural pollination process of cacao, which is critically understudied, was investigated by trapping flower visitors and studying pollen deposition from macrophotographs (Chapter II). Next, we excluded birds, bats, ants and flying insects and squirrels from cacao trees in a full-factorial field experiment and quantified these animals´ contribution to cacao fruit set, fruit loss and yield (Chapter III). Lastly, we aimed to assess whether fruit quantity and quality of native cacao increases through manually supplementing pollen (Chapter II and IV), and whether microclimatic conditions and the genetic background of the studied varieties limit fruit set (Chapter IV).
Chapter II – Cacao flower visitation: Low pollen deposition, low fruit set and dominance of herbivores
Given the importance of cacao pollination for the global chocolate production, it is remarkable that fruit set limitations are still understudied. Knowledge on flower visitation and the effect of landscape context and local management are lacking, especially in the crop’s region of origin. Moreover, the role of pollen deposition in limiting fruit set as well as the benefits of hand pollination in native cacao are unknown. In this chapter, we aimed to close the current knowledge gaps on cacao pollination biology and sampled flower visitors in 20 Peruvian agroforests with native cacao, along gradients of shade cover and forest distance. We also assessed pollen quantities and compared fruit set between manually and naturally pollinated flowers. We found that herbivores were the most abundant flower visitors in both northern and southern Peru, but we could not conclude which insects are effective cacao pollinators. Fruit set was remarkably low (2%) but improved to 7% due to pollen supplementation. Other factors such as a lack of effective pollinators, genetic pollen incompatibility or resource unavailability could be causing fruit set limitations. We conclude that revealing those causes and the effective pollinators of cacao will be key to improve pollination services in cacao.
Chapter III – Quantifying services and disservices provided by insects and vertebrates in cacao agroforestry landscapes
Pollination and pest control, two ecosystem services that support cacao yield, are provided by insects and vertebrates. However, animals also generate disservices, and their combined contribution is still unclear. Therefore, we excluded flying insects, ants, birds and bats, and as a side effect also squirrels from cacao trees and we assessed fruit set, fruit loss and final yield. Local management and landscape context can influence animal occurrence in cacao agroforestry landscapes; therefore, shade cover and forest distance were included in the analyses. Flying insects benefitted cacao fruit set, with largest gains in agroforests with intermediate shade cover. Birds and bats were also associated with improved fruit set rates and with a 114% increase in yield, potentially due to pest control services provided by these animals. The role of ants was complicated: these insects had a positive effect on yield, but only close to forest. We also evidenced disservices generated by ants and squirrels, causing 7% and 10% of harvest loss, respectively. Even though the benefits provided by animals outweighed the disservices, trade-offs between services and disservices still should be integrated in cacao agroforestry management.
Chapter IV – Cross-pollination improves fruit set and yield quality of Peruvian native cacao
Because yields of the cacao tree are restricted by pollination, hand pollination has been proposed to improve yield quantity and potentially, also quality. However, low self- and cross-compatibility of native cacao, and abiotic conditions could cancel out hand pollination benefits. Yet, the impact of genetic constraints and abiotic conditions on fruit set have not been assessed in native cacao so far. To increase our understanding of the factors that limit fruit set in native cacao, we compared manual self- and cross-pollination with five native genotypes selected for their sensorial quality and simultaneously tested for effects of soil water content, temperature, and relative air humidity. We also compared quality traits between manually and naturally pollinated fruits. Success rates of self-pollination were low (0.5%), but increased three- to eightfold due to cross-pollination, depending on the genotype of the pollen donor. Fruit set was also affected by the interaction between relative air humidity and temperature, and we found heavier and more premium seeds in fruits resulting from manual than natural pollination. Together, these findings show that reproductive traits of native cacao are constrained by genetic compatibility and abiotic conditions. We argue that because of the high costs of hand pollination, natural cross-pollination with native pollen donors should be promoted so that quality improvements can result in optimal economic gains for smallholder farmers.
Chapter V – Discussion
In this thesis, we demonstrated that the presence of flying insects, ants and vertebrates, local and landscape management practices, and pollen supplementation interactively affected cacao yield, at different stages of the development from flower to fruit. First, we showed that fruit set improved by intermediate shade levels and flower visitation by flying insects. Because the effective cacao pollinators remain unknown, we recommend shade cover management to safeguard fruit set rates. The importance of integrating trade-offs in wildlife-friendly management was highlighted by lower harvest losses due to ants and squirrels than the yield benefits provided by birds and bats. The maintenance of forest in the landscape might further promote occurrence of beneficial animals, because in proximity to forest, ants were positively associated with cacao yields. Therefore, an integrated wildlife-friendly farming approach in which shade cover is managed and forest is maintained or restored to optimize ecosystem service provision, while minimizing fruit loss, might benefit yields of native cacao. Finally, manual cross-pollination with native genotypes could be recommended, due to improved yield quantity and quality. However, large costs associated with hand pollination might cancel out these benefits. Instead, we argue that in an integrated management, natural cross-pollination should be promoted by employing compatible genotypes in order to improve yield quantity and quality of native cacao.
Prenatal stress (PS) has been shown to influence the development of the fetal brain and to increase the risk for the development of psychiatric disorders in later life. Furthermore, the variation of human serotonin transporter (5-HTT, SLC6A4) gene was suggested to exert a modulating effect on the association between early life stress and the risk for depression. In the present study, we used a 5-Htt6PS paradigm to investigate whether the effects of PS are dependent on the 5-Htt genotype. For this purpose, the effects of PS on cognition, anxiety- and depression-related behavior were examined using a maternal restraint stress paradigm of PS in C57BL6 wild-type (WT) and heterozygous 5-Htt deficient (5-Htt +/2) mice. Additionally, in female offspring, a genome-wide hippocampal gene expression profiling was performed using the Affymetrix GeneChipH Mouse Genome 430 2.0 Array. 5-Htt +/2 offspring showed enhanced memory performance and signs of reduced anxiety as compared to WT offspring. In contrast, exposure of 5-Htt +/2 mice to PS was associated with increased depressive-like behavior, an effect that tended to be more pronounced in female offspring. Further, 5-Htt genotype, PS and their interaction differentially affected the expression of numerous genes and related pathways within the female hippocampus. Specifically, MAPK and neurotrophin signaling were regulated by both the 5-Htt +/2 genotype and PS exposure, whereas cytokine and Wnt signaling were affected in a 5-Htt genotype6PS manner, indicating a gene6environment interaction at the molecular level. In conclusion, our data suggest that although the 5-Htt +/2 genotype shows clear adaptive capacity, 5-Htt +/2 mice –particularly females– at the same time appear to be more vulnerable to developmental stress exposure when compared to WT offspring. Moreover, hippocampal gene expression profiles suggest that distinct molecular mechanisms mediate the behavioral effects of the 5-Htt genotype, PS exposure, and their interaction.