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Institute
- Theodor-Boveri-Institut für Biowissenschaften (799) (remove)
Sonstige beteiligte Institutionen
- Institut für Tierökologie und Tropenbiologie (2)
- Boehringer Ingelheim Pharma GmbH & Co. KG (1)
- Boston Children's Hospital (1)
- Center for Computational and Theoretical Biology (CCTB), Universität Würzburg (1)
- Chemical Biology Laboratory, National Cancer Institue, Frederick (USA) (1)
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- Fachgebiet für Populationsgenomik bei Nutztieren, Universität Hohenheim (1)
- Fraunhofer IGB - Institutsteil Würzburg Translationszentrum Regenerative Therapien für Krebs- und Muskuloskelettale Erkrankungen (1)
ResearcherID
- J-8841-2015 (1)
- N-2030-2015 (1)
EU-Project number / Contract (GA) number
- 311781 (1)
Fluorescence microscopy is a form of light microscopy that has developed during the 20th century and is nowadays a standard tool in Molecular and Cell biology for studying the structure and function of biological molecules. High-resolution fluorescence microscopy techniques, such as dSTORM (direct Stochastic Optical Reconstruction Microscopy) allow the visualization of cellular structures at the nanometre scale (10−9 m). This has already made it possible to decipher the composition and function of various biopolymers, such as proteins, lipids and nucleic acids, up to the three-dimensional (3D) structure of entire organelles. In practice, however, it has been shown that these imaging methods and their further developments still face great challenges in order to achieve an effective resolution below ∼ 10 nm. This is mainly due to the nature of labelling biomolecules. For the detection of molecular structures, immunostaining is often performed as a standard method. Antibodies to which fluorescent molecules are coupled, recognize and bind specifcally and with high affnity to the molecular section of the target structure, also called epitope or antigen. The fluorescent molecules serve as reporter molecules which are imaged with the use of a fluorescence microscope. However, the size of these labels with a length of about 10-15 nm in the case of immunoglobulin G (IgG) antibodies, cause a detection of the fluorescent molecules shifted to the real position of the studied antigen. In dense regions where epitopes are located close to each other, steric hindrance between antibodies can also occur and leads to an insuffcient label density. Together with the shifted detection of fluorescent molecules, these factors can limit the achievable resolution of a microscopy technique. Expansion microscopy (ExM) is a recently developed technique that achieves a resolution improvement by physical expansion of an investigated object. Therefore, biological samples such as cultured cells, tissue sections, whole organs or isolated organelles are chemically anchored into a swellable polymer. By absorbing water, this so-called superabsorber increases its own volume and pulls the covalently bound biomolecules isotropically apart. Routinely, this method achieves a magnifcation of the sample by about four times its volume. But protocol variants have already been developed that result in higher expansion factors of up to 50-fold. Since the ExM technique includes in the frst instance only the sample treatment for anchoring and magnifcation of the sample, it can be combined with various standard methods of fluorescence microscopy. In theory, the resolution of the used imaging technique improves linearly with the expansion factor of the ExM treated sample. However, an insuffcient label density and the size of the antibodies can here again impair the effective achievable resolution. The combination of ExM with high-resolution fluorescence microscopy methods represents a promising strategy to increase the resolution of light microscopy. In this thesis, I will present several ExM variants I developed which show the combination of ExM with confocal microscopy, SIM (Structured Illumination Microscopy), STED (STimulated Emission Depletion) and dSTORM. I optimized existing ExM protocols and developed different expansion strategies, which allow the combination with the respective imaging technique. Thereby, I gained new structural insights of isolated centrioles from the green algae Chlamydomonas reinhardtii by combining ExM with STED and confocal microscopy. In another project, I combined 3D-SIM imaging with ExM and investigated the molecular structure of the so-called synaptonemal complex. This structure is formed during meiosis in eukaryotic cells and contributes to the exchange of genetic material between homologous chromosomes. Especially in combination with dSTORM, the ExM method showed its high potential to overcome the limitations of modern fluorescence microscopy techniques. In this project, I expanded microtubules in mammalian cells, a polymer of the cytoskeleton as well as isolated centrioles from C. reinhardtii. By labelling after expansion of the samples, I was able to signifcantly reduce the linkage error of the label and achieve an improved label density. In future, these advantages together with the single molecule sensitivity and high resolution obtained by the dSTORM method could pave the way for achieving molecular resolution in fluorescence microscopy
Die Bedeutung der genomischen Instabilität in humanen melanocytischen Läsionen ist Gegenstand vieler dermatologischer Studien und bis heute ungeklärt. Ist die Mikrosatelliteninstabilität bloße Begleiterscheinung der unkontrolliert proliferierenden Tumorzellen oder wird ihr ein pathogenetischer Mechanismus zuteil? In Fischen der Gattung Xiphophorus können durch klassische Kreuzungsexperimente melanocytische Läsionen verschiedener Malignitätsgrade induziert werden. Diese Läsionen sind auf Grund ihres genetisch kontrollierten Hintergrundes eindeutig definiert und reproduzierbar - und damit im Vorteil gegenüber der unsicheren Klassifikation humaner Hautläsionen. In der vorliegenden Arbeit wurde hauptsächlich der Frage nachgegangen, ob MIN+ ein obligates molekulares Ereignis für die Progression von Melanomen bis zum terminalen Stadium darstellt. Dieser Fragestellung wurde unter Verwendung PCR-basierter Mikrosatellitenanalysen sowie Multilocus DNA-Fingerprint Analysen nachgegangen. 23 Tumoren unterschiedlicher Malignität wurden im Vergleich zum tumorfreien Normalgewebe desselben Fisches an 12 Genloci unbekannter chromosomaler Lokalisation auf Mikrosatelliteninstabilität untersucht. Es wurde insgesamt eine Zahl von 263 informativen Loci erzielt, von denen sich nur 20 ( = 7.6%) als instabil erwiesen. Mittels der Multilocus-Fingerprint Analysen wurden 8 Melanome und deren korrespondiere Normalgewebe mit drei Sonden hybridisiert. Nur einer von 12 analysierbaren MLFPs zeigte eine genetische Aberration in Form einer Deletion einer einzelnen Bande im Tumorgewebe. Mit diesem Ergebnis wurde das in der Mikrosatellitenanalyse erhaltene Resultat einer nicht signifikanten Mikrosatelliteninstabilität im Xiphophorus-Melanom-Modell System bestätigt. Zusammenfassend kann gesagt werden, daß die Abwesenheit eines MIN+-Phänotypen in den Melanomen von Xiphophorus darauf hinweist, daß der Erwerb von MIN weder ein notwendiges Kriterium für die Initiation eines Tumors noch für seine Progression darstellt. Ein anderer Pfad der Tumorinitiation ist die direkte Schädigung oder der Verlust von Tumorsuppressorgenen, von in Mismatch Repair involvierten Genen oder durch die Transformation von Proto-Onkogenen zu Onkogenen. In dieser Arbeit wurde die Expression von drei Genen, die in der Regulation des Zellzyklus Schlüsselrollen spielen (rb, p53, cdkn2a), sowie einer Komponente des MMR-Systems (MSH2) auf RNA-Ebene untersucht. Ihre Expressionsstärke wurde in folgenden Geweben miteinander verglichen: Maligne Melanome, benigne Läsionen, tumorfreie Kontrollgewebe und die Xiphophorus-Melanomzellinie (PSM). MSH2 und p53 wurden in allen untersuchten Geweben auf gleichem Niveau exprimiert. Die vergleichende Expressionsanalyse des vermeintlichen "melanoma susceptibility gene" cdkn2a im Melanom-Modell und der PSM-Zellinie bestätigte die bereits vorbeschriebene Überexpression des Zellzyklusinhibitors in malignen Melanomen von Xiphophorus-Hybriden. Die Untersuchung des Expressionsmusters von Rb in den oben genannten Geweben ergab eine verminderte Transkription dieses Gens in malignen Melanomen. Eine mögliche Interpretation dieses Ergebnisses wäre, einen Defekt in Rb oder pRB zu Grunde zu legen und die Hochregulation von cdkn2a entsprechend einer negativen Rückkopplungsschleife als physiologische Konsequenz anzusehen.
Neuronal representation and processing of chemosensory communication signals in the ant brain
(2008)
Ants heavily rely on olfaction for communication and orientation and ant societies are characterized by caste- and sex-specific division of labor. Olfaction plays a key role in mediating caste-specific behaviours. I investigated whether caste- and sex-specific differences in odor driven behavior are reflected in specific differences and/or adaptations in the ant olfactory system. In particular, I asked the question whether in the carpenter ant, Camponotus floridanus, the olfactory pathway exhibits structural and/or functional adaptations to processing of pheromonal and general odors. To analyze neuroanatomical specializations, the central olfactory pathway in the brain of large (major) workers, small (minor) workers, virgin queens, and males of the carpenter ant C. floridanus was investigated using fluorescent tracing, immunocytochemistry, confocal microscopy and 3D-analyzes. For physiological analyzes of processing of pheromonal and non-pheromonal odors in the first odor processing neuropil , the antennal lobe (AL), calcium imaging of olfactory projection neurons (PNs) was applied. Although different in total glomerular volumes, the numbers of olfactory glomeruli in the ALs were similar across the female worker caste and in virgin queens. Here the AL contains up to ~460 olfactory glomeruli organized in 7 distinct clusters innervated via 7 antennal sensory tracts. The AL is divided into two hemispheres regarding innervations of glomeruli by PNs with axons leaving via a dual output pathway. This pathway consists of the medial (m) and lateral (l) antenno-cerebral tract (ACT) and connects the AL with the higher integration areas in the mushroom bodies (MB) and the lateral horn (LH). M- and l-ACT PNs differ in their target areas in the MB calyx and the LH. Three additional ACTs (mediolateral - ml) project to the lateral protocerebrum only. Males had ~45% fewer glomeruli compared to females and one of the seven sensory tracts was absent. Despite a substantially smaller number of glomeruli, males possess a dual PN output pathway to the MBs. In contrast to females, however, only a small number of glomeruli were innervated by projection neurons of the m-ACT. Whereas all glomeruli in males were densely innervated by serotonergic processes, glomeruli innervated by sensory tract six lacked serotonergic innervations in the female castes. It appears that differences in general glomerular organization are subtle among the female castes, but sex-specific differences in the number, connectivity and neuromodulatory innervations of glomeruli are substantial and likely to promote differences in olfactory behavior. Calcium imaging experiments to monitor pheromonal and non-pheromonal processing in the ant AL revealed that odor responses were reproducible and comparable across individuals. Calcium responses to both odor groups were very sensitive (10-11 dilution), and patterns from both groups were partly overlapping indicating that processing of both odor classes is not spatially segregated within the AL. Intensity response patterns to the pheromone components tested (trail pheromone: nerolic acid; alarm pheromone: n-undecane), in most cases, remained invariant over a wide range of intensities (7-8 log units), whereas patterns in response to general odors (heptanal, octanol) varied across intensities. Durations of calcium responses to stimulation with the trail pheromone component nerolic acid increased with increasing odor concentration indicating that odor quality is maintained by a stable pattern (concentration invariance) and intensity is mainly encoded in the response durations of calcium activities. For n-undecane and both general odors increasing response dynamics were only monitored in very few cases. In summary, this is the first detailed structure-function analyses within the ant’s central olfactory system. The results contribute to a better understanding of important aspects of odor processing and olfactory adaptations in an insect’s central olfactory system. Furthermore, this study serves as an excellent basis for future anatomical and/or physiological experiments.
Die Bcl-2-Familienmitglieder A1 und sein humanes Homolog Bfl-1 gewährleisten das Überleben der Zelle. Gleichzeitig trägt eine Dysregulation der Expression von A1/ Bfl-1 zur Krebsentstehung bei. Die Stabilität von A1/ Bfl-1 wird durch deren Ubiquitinylierung sowie die anschließende proteosomale Degradation gesteuert. Mit Hilfe eines Yeast-Two-Hybrid-Screens wurde die E3-Ubiquitinligase HectD1 als potentieller Interaktionspartner von A1/ Bfl-1 identifiziert. Die Interaktion von A1 und HectD1 des Yeast-Two-Hybrid-Screens konnte in Säugerzellen bestätigt werden. Desweiteren konnte gezeigt werden, dass lediglich 87 Aminosäuren für eine Interaktion von HectD1 und A1 nötig sind. Da membrangebundenes HectD1 zu einer Translokation von zytosolischem A1 an die Zellmembran führt, kann man davon ausgehen, dass beide Proteine auch in vivo miteinander interagieren. Eine dominant negative HectD1-Mutante schließlich beeinflusst die Ubiqutinylierung von A1 und führt somit zu dessen Stabilisierung. Diese Daten legen nahe, dass HectD1 ein wichtiger negativer Regulator von A1/ Bfl-1 ist und dass HectD1 für die Regulierung der A1/ Bfl-1-Proteinmenge in (Krebs)zellen sehr wichtig ist.
Trotz beträchtlicher Anstrengung Malaria zu kontrollieren bzw. zu eradizieren, stellt die Krankheit weiterhin eines der gravierendsten Gesundheitsprobleme unseres Jahrtausends dar. Malaria fordert jährlich zwischen 0,7 und 2,7 Millionen Menschenleben, beeinträchtigt schulische und soziale Entwicklung und hemmt erheblich das Wirtschaftswachstum der betroffenen Länder. In Burkina Faso, einem der ärmsten Länder der Welt, ist Malaria eines der größten Gesundheitsprobleme und ca. ein Drittel aller Todesfälle werden hier Malaria angelastet. Die sich weiter ausbreiteten Resistenzen gegen die gängigen Malariamedikamente machen die Bekämpfung der Malaria zunehmend schwierig. Artemisinin basierende Kombinationstherapien sind aktuell, trotz relativ hoher Therapiekosten und erster Resistenzen, die Erstlinien Behandlung. Effektive und billige neue Kombinationstherapien werden dringend benötigt. In dieser Doktorarbeit wurde das Resistenzpotential von Artemisinin modelliert. Die Homologiemodellierungen unterstützen die These von Krishna und Kollegen von SERCA als einzige Zielstruktur von Artemisinin. Des Weiteren wurde Methylenblau als neues altes Malariamittel evaluiert. Methylenblau ist das erste gegen Malaria eingesetzte Medikament, agiert als ein prooxidatives Agens und inhibiert selektiv und nicht-kompetitiv die P. falciparum Glutathion Reduktase. Die additiven und multiplen Zielprotein Effekte von Methylenblau wurden experimentell untersucht und hier in einem bioinformatischem Modell getestet. Unter dem Einfluss von Methylenblau werden einige Schlüsselenzyme des Redoxstoffwechsels in ihrer Aktivität beeinträchtigt und der Parasit wird verstärkt oxidativem Stress ausgesetzt. Des Weiteren konnte in dieser Dr. Arbeit eine starke Kooperationsbereitschaft der urbanen und ländlichen Bevölkerung an zukünftigen Malaria Projekten gezeigt werden.
Das Renin-Angiotensin-Aldosteron-System (RAAS) reguliert den Blutdruck sowie den Elektrolyt- und Wasserhaushalt. Das aktive Peptid, Angiotensin II (AngII), führt dabei zur Vasokonstriktion und in höheren Konzentrationen zu Bluthochdruck. Hypertensive Patienten haben ein erhöhtes Risiko an Krebs zu erkranken, vor allem an Nierenkrebs. Wir konnten bereits in vivo zeigen, dass AngII in der Lage ist, den Blutdruck zu steigern und dosisabhängig zu DNA-Schäden über den Angiotensin II Typ 1-Rezeptor (AT1R) führt. Ein stimuliertes RAAS kann ferner über die Aktivierung der NADPH-Oxidase, einer Hauptquelle der Generierung reaktiver Sauerstoffspezies (ROS) in der Zelle, zu oxidativem Stress führen. Zielsetzung dieser Arbeit war es zum einen, mit Hilfe von AT1a-Rezeptor-defizienten Mäusen in vivo zu prüfen, ob die Bildung von ROS, sowie die Bildung von DNA-Schäden in der Niere und im Herzen unabhängig von einem erhöhten Blutdruck auftreten. Zum anderen sollte, ebenfalls in vivo, untersucht werden, ob eine oder beide von zwei untersuchten Isoformen der NADPH-Oxidase (Nox) für die Auslösung oxidativen Stresses in der Niere verantwortlich ist.
Zunächst wurden für den Versuch zur Überprüfung der Abhängigkeit AngII-induzierter DNA-Schäden vom Blutdruck männliche C57BL/6-Mäuse und AT1a-Knockout (KO)-Mäuse mit osmotischen Minipumpen ausgestattet, die AngII in einer Konzentrationen von 600 ng/kg min über einen Zeitraum von 28 Tagen abgaben. Zusätzlich wurde eine Gruppe von AngII-behandelten Wildtyp (WT)-Mäusen mit dem AT1-Rezeptor-Blocker Candesartan (Cand) behandelt. Während des Versuchszeitraumes fanden regelmäßige, nicht-invasive Blutdruckmessungen an den wachen Mäusen statt. In WT-Mäusen induzierte AngII Bluthochdruck, verursachte erhöhte Albumin-Level im Urin und führte zur Bildung von ROS in Niere und im Herzen. Außerdem traten in dieser Gruppe DNA-Schäden in Form von Einzel- und Doppelstrangbrüchen auf. All diese Reaktionen auf AngII konnten jedoch durch gleichzeitige Behandlung mit Cand verhindert werden. AT1a-KO-Mäuse hatten, verglichen mit WT-Kontrollmäusen, einen signifikant niedrigeren Blutdruck und normale Albumin-Level im Urin. In AT1a-KO-Mäusen, die mit AngII behandelt wurden, konnte kein Anstieg des systolischen Blutdrucks sowie kein Einfluss auf die Nierenfunktion gefunden werden. Jedoch führte AngII in dieser Gruppe zu einer Steigerung von ROS in der Niere und im Herzen. Zusätzlich wurden genomische Schäden, vor allem in Form von Doppelstrangbrüchen signifikant in dieser Gruppe induziert. Auch wenn AT1a-KO-Tiere, unabhängig von einer AngII-Infusion, keine eingeschränkte Nierenfunktion zeigten, so wiesen sie erhebliche histopathologische Schäden im Hinblick auf die Glomeruli und das Tubulussystem auf. Diese Art von Schäden deuten auf eine besondere Bedeutung des AT1aR im Hinblick auf die embryonale Entwicklung der Niere hin. Zusammenfassend beweisen die Ergebnisse dieses Experiments eindeutig, dass eine AngII-induzierte ROS-Produktion und die Induktion von DNA-Schäden unabhängig von einem erhöhten Blutdruck auftreten. Da in der AngII-behandelten AT1a-KO-Gruppe eine signifikant höhere Expression des AT1b-Rezeptors zu finden war und die Blockade von beiden Rezeptorsubtypen mit Cand zu einer Verhinderung der schädlichen Effekte durch AngII führte, scheint der AT1bR im Falle einer AT1aR-Defizienz für die Entstehung der Schäden zuständig zu sein.
Ziel des zweiten Experimentes war es, den Beitrag der Nox2 und Nox4 zum oxidativen DNA-Schaden in vivo zu untersuchen. Hierfür wurden männliche C57BL/6-Mäuse und Nox2- oder Nox4-defiziente Mäuse mit osmotischen Minipumpen ausgestattet, die AngII in einer Konzentration von 600 ng/kg min über einen Zeitraum von 28 Tagen abgaben. Im WT-Stamm und in beiden Nox-defizienten Stämmen induzierte AngII Bluthochdruck, verursachte erhöhte Albumin-Level im Urin und führte zur Bildung von ROS in der Niere. Außerdem waren in allen AngII-behandelten Gruppen genomische Schäden, vor allem in Form von Doppelstrangbrüchen, erhöht. Auch in Abwesenheit von AngII wiesen Nox2- und Nox4-defiziente Mäuse mehr Doppelstrangbrüche im Vergleich zu WT-Kontrollmäusen auf. Interessanterweise kompensieren allerdings weder Nox2 noch Nox4 das Fehlen der jeweils anderen Isoform auf RNA-Basis. Aufgrund dieser Ergebnisse schließen wir, dass bislang keine Isoform alleine für die Generierung von oxidativen DNA-Schäden in der Niere verantwortlich gemacht werden kann und dass eine Beteiligung einer weiteren Nox-Isoform sehr wahrscheinlich ist. Möglicherweise könnten aber auch andere ROS-generierende Enzyme, wie Xanthinoxidase oder Stickoxidsynthase involviert sein. Da genomische Schäden in Nieren von Nox2- und Nox4-defizienten Mäusen in Abwesenheit von AngII gegenüber den Schäden in WT-Kontrollmäusen erhöht waren, könnten die beiden Isoformen auch eine schützende Funktion im Bereich von Nierenkrankheiten übernehmen. Da dies aber bislang nur für Nox4 beschrieben ist, ist es wahrscheinlicher, dass das Fehlen von einer der beiden Isoformen eher einen Einfluss auf die Embryonalentwicklung hat. Um dies jedoch abschließend zu klären wäre es sinnvoll mit induzierbaren Knockout-Modellen zu arbeiten, bei denen mögliche entwicklungsbedingte Effekte minimiert werden können.
The eukaryotic parasite Trypanosoma brucei has evolved sophisticated strategies to persist within its mammalian host. Trypanosomes evade the hosts' immune system by antigenic variation of their surface coat, consisting of variant surface glycoproteins (VSGs). Out of a repertoire of thousands of VSG genes, only one is expressed at any given time from one of the 15 telomeric expression sites (ES). The VSG is stochastically exchanged either by a transcriptional switch of the active ES (in situ switch) or by a recombinational exchange of the VSG within the active ES. However, for infections to persist, the parasite burden has to be limited. The slender (sl) bloodstream form secretes the stumpy induction factor (SIF), which accumulates with rising parasitemia. SIF induces the irreversible developmental transition from the proliferative sl to the cell cycle-arrested but fly-infective stumpy (st) stage once a concentration threshold is reached. Thus, antigenic variation and st development ensure persistent infections and transmissibility. A previous study in monomorphic cells indicated that the attenuation of the active ES could be relevant for the development of trypanosomes. The present thesis investigated this hypothesis using the inducible overexpression of an ectopic VSG in pleomorphic trypanosomes, which possess full developmental competence. These studies revealed a surprising phenotypic plasticity: while the endogenous VSG was always down-regulated upon induction, the ESactivity determined whether the VSG overexpressors arrested in growth or kept proliferating. Full ES-attenuation induced the differentiation of bona fide st parasites independent of the cell density and thus represents the sole natural SIF-independent differentiation trigger to date. A milder decrease of the ES-activity did not induce phenotypic changes, but appeared to prime the parasites for SIF-induced differentiation. These results demonstrate that antigenic variation and development are linked and indicated that the ES and the VSG are independently regulated. Therefore, I investigated in the second part of my thesis how ES-attenuation and VSG-silencing can be mediated. Integration of reporters with a functional or defective VSG 3'UTR into different genomic loci showed that the maintenance of the active state of the ES depends on a conserved motif within the VSG 3'UTR. In situ switching was only triggered when the telomere-proximal motif was partially deleted, suggesting that it serves as a DNA-binding motif for a telomere-associated protein. The VSG levels seem to be additionally regulated in trans based on the VSG 3'UTR independent of the genomic context, which was reinforced by the regulation of a constitutively expressed reporter with VSG 3' UTR upon ectopic VSG overexpression.
Im Karpfenfisch Alburnus alburnus wurden die bisher größten überzähligen Chromosomen bei Wirbeltieren entdeckt. Dies ermöglichte eine umfangreiche zytogenetische und molekulare Studie dieser außergewöhnlichen Genomelemente. Aus Populationsstudien, die mehrere Fundorte in Deutschland einschlossen, konnten Informationen über die Verteilung der B Chromosomen in Fischen verschiedener Herkunftsorte ermittelt werden. Eine derartige Studie könnte zukünftig auch auf andere Länder ausgedehnt werden. Eine detaillierte, zytogenetische Analyse mit allen konventionellen Hellfeld- und Fluoreszenzbänderungen sowie Fluoreszenz in situ Hybridisierungen mit den ribosomalen 5S, 18S/28S rDNA-Proben und der Telomerprobe (TTAGGG)n, zeigte, dass die außergewöhnlich großen B Chromosomen von A. alburnus heterochromatisch, GC-reich und spät replizierend sind. Es wurden bei Alburnus alburnus keinerlei Hinweise auf heteromorphe Geschlechtschromosomen gefunden. Die molekularen Untersuchungen basierten hauptsächlich auf AFLP-Analysen, mit denen eine B Chromosomen-spezifische Bande entdeckt und isoliert werden konnte. Nach Klonierung und Sequenzierung sowie dem Durchsuchen einer Fischspezifischen Datenbank konnte eine retrotransposable Sequenz (Gypsy/Ty3 LTRRetrotranpson) gefunden werden. Ferner konnte eine deutliche Homologie zu dem Nterminalen Teil der reversen Transkriptase von Medaka, Oryzias latipes, dokumentiert werden. Die Southern blot-Untersuchungen und der PCR-Test zeigten, dass es sich bei der entdeckten 203 bp-Sequenz um eine B Chromosomen- und Alburnus alburnus-spezifische Sequenz handelt, welche hochrepetitiv über die beiden Arme der überzähligen Chromosomen verteilt ist. Der Ursprung und die Funktion der massiven überzähligen Chromosomen blieb offen. Da es aber nach wie vor wenig Information über B Chromosomensequenzen und DNA-Organisation im Allgemeinen und besonders bei Fischen gibt (Mestriner et al., 2000), sind die Ergebnisse dieser Studie für die Aufdeckung des Ursprungs und der Evolution überzähliger Chromosomen von allgemeiner Bedeutung, da sie wohl den Hauptanteil der DNA-Zusammensetzung des größten, bisher unter den Wirbeltieren entdeckten überzähligen Chromosoms darstellen. Die Analyse meiotischer Chromosomen zeigte, dass das B Chromosom in der Diakinese als selbstpaarendes Ringchromosom vorliegt. Zusammenfassung und Ausblick 101 Mittels durchflußzytophotometrischer DNA-Messungen konnte der Beitrag des außerordentlich großen B Chromosoms zum Gesamt-DNA-Gehalt von A. alburnus bestimmt werden und Fische auf das Vorhandensein des überzähligen Chromosoms, allerdings unter Tötung, analysiert werden. Dies kann in Zukunft durch Ausnutzung von Sequenzinformation über das B Chromosom und der damit einhergehenden Konstruktion spezifischer PCR-Primer („minimal-invasiver Flossentest“) vermieden werden. Fische aus unterschiedlichen Populationen, eventuell auch europaweit, können so schnell und zuverlässig auf das Vorhandensein des überzähligen Chromosoms hin untersucht werden, mit dem Zweck, durch künftige Verpaarung der Tiere mit 0, 1 oder 2 B Chromosomen den Vererbungs- bzw. Weitergabemechanismus der überzähligen Chromosomen auf die nächste Generation zu studieren.
Microbial species (bacteria and archaea) in the gut are important for human health in various ways. Not only does the species composition vary considerably within the human population, but each individual also appears to have its own strains of a given species. While it is known from studies of bacterial pan-genomes, that genetic variation between strains can differ considerably, such as in Escherichia coli, the extent of genetic variation of strains for abundant gut species has not been surveyed in a natural habitat. This is mainly due to the fact that most of these species cannot be cultured in the laboratory. Genetic variation can range from microscale genomic rearrangements such as small nucleotide polymorphism (SNP) to macroscale large genomic rearrangements like structural variations. Metagenomics offers an alternative solution to study genetic variation in prokaryotes, as it involves DNA sequencing of the whole community directly from the environment. However, most metagenomic studies to date only focus on variation in gene abundance and hence are not able to characterize genetic variation (in terms of presence or absence of SNPs and genes) of gut microbial strains of individuals.
The aim of my doctorate studies was therefore to study the extent of genetic variation in the genomic sequence of gut prokaryotic species and its phenotypic effects based on: (1) the impact of SNP variation in gut bacterial species, by focusing on genes under selective pressure and (2) the gene content variation (as a proxy for structural variation) and their effect on microbial species and the phenotypic traits of their human host.
In the first part of my doctorate studies, I was involved in a project in which we created a catalogue of 10.3 million SNPs in gut prokaryotic species, based on metagenomes. I used this to perform the first SNP-based comparative study of prokaryotic species evolution in a natural habitat. Here, I found that strains of gut microbial species in different individuals evolve at more similar rates than the strains within an individual. In addition, I found that gene evolution can be uncoupled from the evolution of its originating species, and that this could be related to selective pressure such as diet, exemplified by galactokinase gene (galK). Despite the individuality (i.e. uniqueness of each individual within the studied metagenomic dataset) in the SNP profile of the gut microbiota that we found, for most cases it is not possible to link SNPs with phenotypic differences. For this reason I also used gene content as a proxy to study structural variation in metagenomes.
In the second part of my doctorate studies, I developed a methodology to characterize the variability of gene content in gut bacterial species, using metagenomes. My approach is based on gene deletions, and was applied to abundant species (demonstrated using a set of 11 species). The method is sufficiently robust as it captures a similar range of gene content variability as has been detected in completely sequenced genomes. Using this procedure I found individuals differ by an average of 13% in their gene content of gut bacterial strains within the same species. Interestingly no two individuals shared the same gene content across bacterial species. However, this variation corresponds to a lower limit, as it is only accounts for gene deletion and not insertions. This large variation in the gene content of gut strain was found to affect important functions, such as polysaccharide utilization loci (PULs) and capsular polysaccharide synthesis (CPS), which are related with digestion of dietary fibers.
In summary, I have shown that metagenomics based approaches can be robust in characterizing genetic variation in gut bacterial species. I also illustrated, using examples both for SNPs and gene content (galK, PULs and CPS), that this genetic variation can be used to predict the phenotypic characteristics of the microbial species, as well as predicting the phenotype of their human host (for example, their capacity to digest different food components). Overall, the results of my thesis highlight the importance of characterizing the strains in the gut microbiome analogous to the emerging variability and importance of human genomics.
A large variety of sex determination systems have been described in fish. However, almost no information is available about sex determination in the classical fish models, the zebrafish Danio rerio and the pufferfish Takifugu rubripes. A DNA-binding protein gene called dmrt1bY (or DMY) has been recently described as an outstanding candidate for the primary sex-determining gene in the medaka fish Oryzias latipes. But this gene is not the universal master sex-determining gene in teleost fish, since dmrt1bY is not found in most other fishes. Hence, other fish models need to be examined including the platyfish Xiphophorus maculatus. Xiphophorus maculatus has three types of sex chromosomes (X, Y and W; females are XX, WX or WY; males are XY or YY). Its gonosomes are at an early stage of differentiation. The sex-determining locus on the sex chromosomes is flanked by two receptor tyrosine kinase genes, the Xmrk oncogene and its protooncogenic progenitor gene egfrb, which both delimit a region of about 0.6 centiMorgans. This situation should allow the positional cloning of the sex-determining gene (SD) of the platyfish. For this purpose, Bacterial Artificial Chromosome (BAC) contigs were assembled from a BAC library of XY males constructed in our laboratory, using the oncogene Xmrk, egfrb, as well as a Y-specific pseudogene called ps-criptY as starting points. The ps-criptY sequence was found to be closely linked to the SD gene, since no recombination was observed between SD and ps-criptY in more than 400 individuals tested. Two major BAC contigs for the X chromosome (about 2.5 Mb) and three major BAC contigs for the Y chromosome (about 3.5 Mb) were built up and analyzed by strategic sequencing. These are some of the largest contigs ever assembled for the sex chromosomes of a non-mammalian vertebrate species. The molecular analysis of the ps-criptY contig was the major objective of this work. The Y-specific ps-criptY contig has been extended over 1 Mb in this work with 58 identified molecular markers. Approximatively 700 kb of non-redundant sequences has been obtained from this contig by strategic sequencing. Numerous Y-linked markers from the contig including ps-criptY were also detected on the X chromosome. Nevertheless, major structural differences were observed between the X and Y chromosomes. Particularly, a large region, which is present at one copy on the X chromosome and contains several candidate genes, was found to be duplicated on the Y chromosome. Evidence for an inversion in the sex-determining region and for the Y-specific accumulation of a repeated sequence called XIR was also obtained. Such events might correspond to an initiation of differentiation between both types of gonosomes. Accumulation of transposable elements was also observed in the ps-criptY contig. A DNA transposable element, helitron, was isolated from the sex-determining region of X. maculatus. Three copies of helitron are located on the ps-criptY contig and one copy on the X-linked contig (helitron has roughly 15 copies per haploid genome). No in-frame stop codon, truncation or intron was found in these four copies, which present high nucleotide identities to each other. This suggests that helitron elements might be active or have been recently active in X. maculatus. A consensus open reading frame of helitron was also assembled from medaka (Oryzias latipes) genomic sequences. Two candidate genes from the ps-criptY contig are also located on the W chromosome in the X. maculatus Usumacinta strain (heterogamety). These markers show the relationship between the different types of gonosomes and allow to compare the male and female heterogameties in the platyfish. Several gene candidates were identified in the ps-criptY contig. However, some of them such as msh2, cript, igd and acr probably correspond to pseudogenes. Interestingly, a novel gene, called swimy, is exclusively expressed in spermatogonia of the adult testis. Swimy is a gene encoding a DNA-binding protein with several putative DNA-binding domains. The data suggest that swimy is a very promising candidate for the master SD gene. Another novel gene, which is called fredi and encodes a novel helix-turn-helix protein, is predominately expressed in the adult testis and currently under scrutiny. There is no doubt that the master SD gene of X. maculatus will be identified by positional cloning. Further molecular analysis of the contigs built in this work will shed new light on the molecular mechanism of sex determination and the evolution of sex chromosomes in fish.
Computer Science approaches (software, database, management systems) are powerful tools to boost research. Here they are applied to metabolic modelling in infections as well as health care management. Starting from a comparative analysis this thesis shows own steps and examples towards improvement in metabolic modelling software and health data management. In section 2, new experimental data on metabolites and enzymes induce high interest in metabolic modelling including metabolic flux calculations. Data analysis of metabolites, calculation of metabolic fluxes, pathways and their condition-specific strengths is now possible by an advantageous combination of specific software. How can available software for metabolic modelling be improved from a computational point of view? A number of available and well established software solutions are first discussed individually. This includes information on software origin, capabilities, development and used methodology. Performance information is obtained for the compared software using provided example data sets. A feature based comparison shows limitations and advantages of the compared software for specific tasks in metabolic modeling. Often found limitations include third party software dependence, no comprehensive database management and no standard format for data input and output. Graphical visualization can be improved for complex data visualization and at the web based graphical interface. Other areas for development are platform independency, product line architecture, data standardization, open source movement and new methodologies. The comparison shows clearly space for further software application development including steps towards an optimal user friendly graphical user interface, platform independence, database management system and third party independence especially in the case of desktop applications. The found limitations are not limited to the software compared and are of course also actively tackled in some of the most recent developments. Other improvements should aim at generality and standard data input formats, improved visualization of not only the input data set but also analyzed results. We hope, with the implementation of these suggestions, metabolic software applications will become more professional, cheap, reliable and attractive for the user. Nevertheless, keeping these inherent limitations in mind, we are confident that the tools compared can be recommended for metabolic modeling for instance to model metabolic fluxes in bacteria or metabolic data analysis and studies in infection biology. ...
Dynamic interactions and their changes are at the forefront of current research in bioinformatics and systems biology. This thesis focusses on two particular dynamic aspects of cellular adaptation: miRNA and metabolites.
miRNAs have an established role in hematopoiesis and megakaryocytopoiesis, and platelet miRNAs have potential as tools for understanding basic mechanisms of platelet function. The thesis highlights the possible role of miRNAs in regulating protein translation in platelet lifespan with relevance to platelet apoptosis and identifying involved pathways and potential key regulatory molecules. Furthermore, corresponding miRNA/target mRNAs in murine platelets are identified. Moreover, key miRNAs involved in aortic aneurysm are predicted by similar techniques. The clinical relevance of miRNAs as biomarkers, targets, resulting later translational therapeutics, and tissue specific restrictors of genes expression in cardiovascular diseases is also discussed.
In a second part of thesis we highlight the importance of scientific software solution development in metabolic modelling and how it can be helpful in bioinformatics tool development along with software feature analysis such as performed on metabolic flux analysis applications. We proposed the “Butterfly” approach to implement efficiently scientific software programming. Using this approach, software applications were developed for quantitative Metabolic Flux Analysis and efficient Mass Isotopomer Distribution Analysis (MIDA) in metabolic modelling as well as for data management. “LS-MIDA” allows easy and efficient MIDA analysis and, with a more powerful algorithm and database, the software “Isotopo” allows efficient analysis of metabolic flows, for instance in pathogenic bacteria (Salmonella, Listeria). All three approaches have been published (see Appendices).
Embryonale Stammzellen (ESCs) sind durch zwei charakteristische Eigenschaften definiert. Neben einer kontinuierlichen Selbsterneuerungskapazität weisen ESCs die Fähigkeit auf, in alle Zelltypen der drei Keimblätter differenzieren zu können. Diese Eigenschaften werden unter anderem durch ein Netzwerk wichtiger Pluripotenzfaktoren als auch durch epigenetische Mechanismen reguliert, welche die Transkription von Pluripotenz- und Differenzierungsgenen kontrollieren.
In murinen ESCs sind an der Repression von Differenzierungsgenen auch Polycomb group (PcG) Proteine beteiligt. Diese Proteine bauen zwei Chromatin-modifizierende Komplexe auf, die als Polycomb repressive complex 1 bzw. 2 (PRC1 bzw. PRC2) bezeichnet werden. Nach dem klassischen Modell der Polycombfunktion, katalysieren PRC1 und PRC2 gemeinsam zwei charakteristische Histonmodifikationen, die zur Repression PRC-spezifischer Zielgene beitragen. Zahlreiche Studien in den letzten Jahren belegen, dass der Proteinaufbau der PRC1 Komplexe stark variieren kann, wobei die Familie der Polycomb group RING finger (Pcgf) Proteine eine wichtige Rolle spielt. In diesem Zusammenhang definieren einzelne Pcgf Paraloge (Pcgf1 – 6) verschiedene PRC1 Varianten (PRC1.1 – 1.6), die Komplex-spezifische Bindestellen im Genom aufweisen. Diese Erkenntnisse lassen auf unterschiedliche Mechanismen der PRC1 Varianten und Pcgf Paralog-spezifische Funktionen schließen, die zum jetzigen Zeitpunkt nur wenig erforscht sind.
Für manche Pcgf Paraloge sind wichtige Rollen in verschiedenen Stammzelltypen und während der iPS Reprogrammierung bekannt. Pcgf1 (Nspc1), Pcgf2 (Mel18) und Pcgf4 (Bmi1) zeigen eine Funktion in verschiedenen adulten Stammzellen. Pcgf4 spielt darüber hinaus eine wichtige Rolle in der murinen iPS Reprogrammierung. Für Pcgf6 (Mblr) wird eine Pluripotenz-assoziierte Funktion angenommen, denn Pcgf6 ist das einzige Pcgf Paralog, das eine erhöhte Expression in murinen ESCs aufweist, die jedoch im Verlauf der ESC-Differenzierung absinkt. Außerdem zeigen murine Pcgf6 KD ESCs eine verminderte Expression der Pluripotenzgene Oct4, Sox2 und Nanog, eine De-Repression mesodermaler und Testes-spezifischer Gene als auch eine erhöhte Tendenz zur hämatopoetischen Differenzierung. Wie genau Pcgf6 an der Regulation dieser Prozesse in murinen ESCs beteiligt ist, ist nicht bekannt.
In der hier vorliegenden Dissertation wurde die Funktion von Pcgf6 in der murinen iPS Reprogrammierung untersucht. Da bereits für Pcgf4 eine Rolle in der Reprogrammierung somatischer Zellen gezeigt wurde und Pcgf6 eine erhöhte Expression in ESCs aufweist, wurde auch für Pcgf6 eine Funktion in der iPS Reprogrammierung angenommen. Zunächst konnte in dieser Arbeit gezeigt werden, dass Pcgf6 während der iPS Reprogrammierung verstärkt exprimiert wird und in iPS Zellen eine ESC-ähnliche Expression aufweist. Darüber hinaus konnte Pcgf6 in Kombination mit Oct4, Klf4 und c-Myc spezifisch den Transkriptionsfaktor Sox2 in der iPS Reprogrammierung ersetzen. Zudem wurden für OPKM-induzierte iPS Zellen charakteristische Eigenschaften pluripotenter Zellen nachgewiesen. Außerdem konnte eine Rolle von Pcgf6 als Enhancer-Faktor für die iPS Reprogrammierung ausgeschlossen werden, da die Überexpression von Pcgf6 zusammen mit den OSKM Faktoren keine additiven Effekte auf die Reprogrammierungseffizienz erzielte. Im Gegensatz dazu führte der Knockdown (KD) von Pcgf6 in embryonalen Mausfibroblasten (MEFs) zu verminderten Effizienzen nach OSKM Reprogrammierung. Darüber hinaus handelte es sich bei der Mehrheit der AP+ Kolonien, die unter Pcgf6 KD Konditionen entstanden, um partiell-reprogrammierte iPS Zellen.
Zusammengefasst zeigen die Ergebnisse der hier vorliegenden Arbeit, dass Pcgf6 ein neuer und essentieller Faktor der iPS Reprogrammierung ist, der in Kombination mit Oct4, Klf4 und c-Myc spezifisch den Transkriptionsfaktor Sox2 ersetzen kann.
Die molekularen Mechanismen der Wirt-Parasit-Interaktion bei der durch den Zestoden Echinococcus multilocularis ausgelösten Erkrankung der alveolären Echinokokkose sind bislang ungeklärt. Zudem liegen keine Daten über Entwicklungs- und Differenzierungsmechanismen dieses Parasiten vor, die für die Entwicklung neuer Antiparasitika genutzt werden könnten. Ein bei der Evolution der Metazoen bereits frühzeitig entstandener Signaltransduktionsmechanismus zur Steuerung von Entwicklungsvorgängen ist das TGFβ/BMP-System, das aus strukturell verwandten Zytokinen der TGFβ (transforming growth factor β) bzw. BMP (bone morphogenetic protein)-Familie, oberflächenständigen Rezeptoren der TGFβ-Rezeptorfamilie (Typ I und Typ II) und intrazellulären Signaltransduktoren der Smad-Familie besteht. Außer an Entwicklungsvorgängen tierischer Organismen könnte diesem System eine wichtige Rolle bei der Wirt-Helminth-Kommunikation während Infektionsprozessen zukommen, wie in vorherigen Studien am Nematoden Brugia malayi und am Trematoden Schistosoma mansoni gezeigt werden konnte. Erste, wichtige Schritte zur Charakterisierung von TGFβ und BMP-Signalsystemen in Zestoden wurden in der vorliegenden Arbeit getan. Aufbauend auf einem vorherigen Bericht zu einem Transmembranrezeptor (EmRSK1) und einem Smad-Homologen (EmSmadA) aus Echinococcus multilocularis wurde die Liste der TGFβ/BMP Signaltransduktionsfaktoren in E. multilocularis in dieser Arbeit deutlich erweitert und erstmals umfangreiche funktionelle Studien durchgeführt. Die hier charakterisierten Faktoren umfassen zwei weitere Serin/Threonin-Kinasen der TGFβ/BMP-Rezeptorfamilie (EmRSK2, EmRSK3) sowie intrazelluläre Transduktoren der R-Smad-Subfamilie (EmSmadB, EmSmadC) und ein Homologes zur MAP-kinase-kinase-kinase TAK1 (TGFβ activated kinase 1), genannt EmTAK1. Zudem konnte erstmals für einen parasitären Helminthen ein Zytokin der BMP-Subfamilie, EmBMP, auf molekularer Ebene charakterisiert werden. Strukturelle und funktionelle Untersuchungen legen nahe, dass E. multilocularis sowohl ein TGFβ wie auch ein BMP-Signalsystem exprimiert. Ersteres wird sehr wahrscheinlich durch die Kinase EmRSK2 und den Smad-Faktor EmSmadC gebildet, letzteres durch EmRSK1 und EmSmadB. EmSmadA nimmt eine Sonderstellung ein, da es sowohl durch TGFβ- wie auch durch BMP-Rezeptoren aktiviert werden kann. Die genaue Rolle von EmRSK1 und EmTAK1 wäre durch weitere Untersuchungen zu klären. Signifikante funktionelle Homologien zwischen den TGFβ/BMP-Signalsystemen des Parasiten und Säugern konnten nachgewiesen werden, die sich u.a. darin äußern, dass die Echinococcus Smad-Proteine durch entsprechende Rezeptoren des Menschen aktiviert werden können. Darüber hinaus konnten jedoch auch einige deutliche Unterschiede zwischen den Systemen aus Parasit und Wirt nachgewiesen werden, die sich als Angriffspunkte zur Entwicklung von Chemotherapeutika eignen könnten. So fehlt den Smad-Faktoren EmSmadA und EmSmadC eine MH1-Domäne, die sonst unter allen R-Smads hoch konserviert ist. Zudem sind einige bislang noch nie beschriebene, strukturelle Besonderheiten der Echinococcus TGFβ/BMP-Rezeptoren zu verzeichnen. Auch die Regulation dieser Faktoren und die Kreuz-Interaktion mit weiteren intrazellulären Signalwegen (z.B. der MAP Kinase Kaskade) scheint in E. multilocularis anders zu verlaufen als bislang für Vertebraten, Insekten oder Nematoden beschrieben. Schließlich konnte, als sehr wichtiger Befund, auch nachgewiesen werden dass mindestens ein Rezeptor des Parasiten, EmRSK1, mit einem Zytokin des Wirts (BMP2) in vitro funktionell interagiert. Da BMP2 in Zellkultursystemen, die das Wachstum des Parasiten am befallenen Wirtsorgan nachstellen, einen deutlichen Effekt auf E. multilocularis ausübt, könnte die hier beschriebene EmRSK1/BMP2 – Interaktion von entscheidender Bedeutung für die Wirt-Parasit-Interaktion bei der alveolären Echinokokkose sein.
During infection, bacteria need to adapt to a changing environment and have to endure various stress conditions. Small non-coding RNAs are considered as important regulators of bacterial gene expression and so allow quick adaptations by altering expression of specific target genes. Regulation of gene expression in the human-restricted pathogen Neisseria gonorrhoeae, the causative agent of the sexually transmitted disease gonorrhoea, is only poorly understood. The present study aims a better understanding of gene regulation in N. gonorrhoeae by studying small non-coding RNAs.
The discovery of antisense RNAs for all opa genes led to the hypothesis of asRNA-mediated degradation of out-of-frame opa transcripts. Analysis of asRNA expression revealed a very low abundance of the transcripts and inclusion of another phase-variable gene in the study indicates that the asRNAs are not involved in degradation of out-of-frame transcripts.
This doctoral thesis focuses on the analysis of trans-acting sRNAs. The sibling sRNAs NgncR_162 and NgncR_163 were discovered as post-transcriptional regulators altering expression of genes involved in metabolic processes, amino acid uptake and transcriptional regulation. A more detailed analysis by in silico and transcriptomic approaches showed that the sRNAs regulate a broad variety of genes coding for proteins of central metabolism, amino acid biosynthesis and degradation and several transport processes. Expression levels of the sibling sRNAs depend on the growth phase of the bacteria and on the growth medium. This indicates that NgncR_162 and NgncR_163 are involved in the adaptation of the gonococcal metabolism to specific growth conditions.
This work further initiates characterisation of the sRNA NgncR_237. An in silico analysis showed details on sequence conservation and a possible secondary structure. A combination of in silico target prediction and differential RNA sequencing resulted in the identification of several target genes involved in type IV pilus biogenesis and DNA recombination. However, it was not successful to find induction conditions for sRNA expression. Interestingly, a possible sibling sRNA could be identified that shares the target interaction sequence with NgncR_237 and could therefore target the same mRNAs.
In conclusion, this thesis provides further insights in gene regulation by non-coding RNAs in N. gonorrhoeae by analysing two pairs of sibling sRNAs modulating bacterial metabolism or possibly type IV pilus biogenesis.
Past experience contributes to behavioural organization mainly via learning: Animals learn otherwise ordinary cues as predictors for biologically significant events. This thesis studies such predictive, associative learning, using the fruit fly Drosophila melanogaster. I ask two main questions, which complement each other: One deals with the processing of those cues that are to be learned as predictors for an important event; the other one deals with the processing of the important event itself, which is to be predicted. Do fruit flies learn about combinations of olfactory and visual cues? I probe larval as well as adult fruit flies for the learning about combinations of olfactory and visual cues, using a so called ‘biconditional discrimination’ task: During training, one odour is paired with reinforcement only in light, but not in darkness; the other odour in turn is reinforced only in darkness, but not in light. Thus, neither the odours nor the visual conditions alone predict reinforcement, only combinations of both do. I find no evidence that either larval or adult fruit flies were to solve such task, speaking against a cross-talk between olfactory and visual modalities. Previous studies however suggest such cross-talk. To reconcile these results, I suggest classifying different kinds of interaction between sensory modalities, according to their site along the sensory-motor continuum: I consider an interaction ‘truly’ cross-modal, if it is between the specific features of the stimuli. I consider an interaction ’amodal’ if it instead engages the behavioural tendencies or ‘values’ elicited by each stimulus. Such reasoning brings me to conclude that different behavioural tasks require different kinds of interaction between sensory modalities; whether a given kind of interaction will be found depends on the neuronal infrastructure, which is a function of the species and the developmental stage. Predictive learning of pain-relief in fruit flies Fruit flies build two opposing kinds of memory, based on an experience with electric shock: Those odours that precede shock during training are learned as predictors for punishment and are subsequently avoided; those odours that follow shock during training on the other hand are learned as signals for relief and are subsequently approached. I focus on such relief learning. I start with a detailed parametric analysis of relief learning, testing for reproducibility as well as effects of gender, repetition of training, odour identity, odour concentration and shock intensity. I also characterize how relief memories, once formed, decay. In addition, concerning the psychological mechanisms of relief learning, first, I show that relief learning establishes genuinely associative conditioned approach behaviour and second, I report that it is most likely not mediated by context associations. These results enable the following neurobiological analysis of relief learning; further, they will form in the future the basis for a mathematical model; finally, they will guide the researchers aiming at uncovering relief learning in other experimental systems. Next, I embark upon neurogenetic analysis of relief learning. First, I report that fruit flies mutant for the so called white gene build overall more ‘negative’ memories about an experience with electric shock. That is, in the white mutants, learning about the painful onset of shock is enhanced, whereas learning about the relieving offset of shock is diminished. As they are coherently affected, these two kinds of learning should be in a balance. The molecular mechanism of the effect of white on this balance remains unresolved. Finally, as a first step towards a neuronal circuit analysis of relief learning, I compare it to reward learning and punishment learning. I find that relief learning is distinct from both in terms of the requirement for biogenic amine signaling: Reward and punishment are respectively signalled by octopamine and dopamine, for relief learning, either of these seem dispensible. Further, I find no evidence for roles for two other biogenic amines, tyramine and serotonin in relief learning. Based on these findings I give directions for further research.
In contrast to c-Myc, a deregulated expression of the MYCN gene is restricted to human neuroendocrine tumours. In most cases, the excessive activity of N-Myc results from a MYCN amplification. In neuroblastoma, amplification of MYCN is a predictor of poor prognosis and resistance to therapy. The inability to target the N-Myc protein directly necessitates the search for alternative targets. This project aimed at identifying genes specifically required for growth and survival of cells that express high levels of N-Myc using high-throughput shRNA screening combined with next generation sequencing. The identification and analysis of these genes will shed light on functional interaction partners of N-Myc.
We screened a shRNA library containing 18,327 shRNAs and identified 148 shRNAs, which were selectively depleted in the presence of active N-Myc. In addition, shRNAs targeting genes that are involved in p53 and ARF turnover and apoptosis were depleted in the cell population during the screen. These processes are known to affect N-Myc-mediated apoptosis. Consequently, these results biologically validated the screen. The 148 shRNAs that showed a significant synthetic lethal interaction with high levels of N-Myc expression were further analysed using the bioinformatics program DAVID. We found an enrichment of shRNAs that target genes involved in specific biological processes. For example, we validated synthetic lethal interactions for genes such as, THOC1, NUP153 and LARP7, which play an important role in the process of RNA polymerase II-mediated transcription elongation. We also validated genes that are involved in the neddylation pathway.
In the screen we identified Cullin 3, which is a component of the BTB-CUL3-Rbx1 ubiquitin ligase that is involved in the turnover of Cyclin E. Depletion of cullin 3 and activation of N-Myc was found to synergistically increase Cyclin E expression to supraphysiological levels, inducing S-phase arrest and a strong DNA damage response.
Together with results from a proteomics analysis of N-Myc associated proteins, our results lead us to the following hypothesis: In a neuroblastoma cell, the high levels of N-Myc result in a conflict between RNA polymerase II and the replication machinery during S-phase. The newly identified interaction partners of N- Myc are required to solve this conflict. Consequently, loss of the interaction leads to a massive DNA damage and the induction of apoptosis. In addition, inhibition or depletion of the essential components of the neddylation pathway also results in an unresolvable problem during S-phase.
Neisseria gonorrhoeae is a human-specific pathogen that causes gonorrhea. It is defined as a super bacterium by the WHO due to the emergence of gonococci that are resistant to a variety of antibiotics and a rapidly increasing infection incidence. Genome-wide investigation of neisserial gene essentiality and novel virulence factors is urgently required in order to identify new targets for anti-neisserial therapeutics. To identify essential genes and new virulence factors, a high-density mutant library in N. gonorrhoeae MS11 was generated by in vitro transposon mutagenesis. The transposon library harbors more than 100,000 individual mutants, a density that is unprecedented in gonococcal research. Essential genes in N. gonorrhoeae were determined by enumerating frequencies of transposon insertion sites (TIS) with Illumina deep sequencing (Tn-seq). Tn-seq indicated an average distance between adjacent TIS of 25 bp. Statistical analysis unequivocally demonstrated 781 genes that were significantly depleted in TIS and thus are essential for Neisseria survival. A subset of the genes was experimentally verified to comprise essential genes and thus support the outcome of the study. The hereby identified candidate essential genes thus may constitute excellent targets for the development of new antibiotics or vaccines.
In a second study, the transposon mutant library was applied in a genome-scale “negative-selection strategy” to identify genes that are involved in low phosphate-dependent invasion (LPDI). LPDI is dependent on the Neisseria porin subtype PorBIA which acts as an epithelial cell invasin in absence of phosphate and is associated with severe pathogenicity in disseminated gonococcal infections (DGI). Tn-seq demonstrated 98 genes, which were involved in adherence to host cells and 43 genes involved in host cell invasion. E.g. the hypothetical protein NGFG_00506, an ABC transporter ATP-binding protein NGFG_01643, as well as NGFG_04218 encoding a homolog of mafI in N. gonorrhoeae FA1090 were experimentally verified as new invasive factors in LPDI. NGFG_01605, a predicted protease, was identified to be a common factor involved in PorBIA, Opa50 and Opa57-mediated neisserial engulfment by the epithelial cells. Thus, this first systematic Tn-seq application in N. gonorrhoeae identified a set of previously unknown N. gonorrhoeae invasive factors which demonstrate molecular mechanisms of DGI.
In der vorliegenden Arbeit wurden die Mechanismen der Hochdosis-GC-Pulstherapie im Zusammenhang mit akuten Schüben von MS-Patienten anhand des Tiermodells der MS, der Experimentellen Autoimmunen Enzephalomyelitis (EAE), untersucht. Die EAE wurde in C57Bl/6 Mäusen und diversen GR-defizienten Mäusen durch Immunisierung mit Myelinoligodendrozytenglykoprotein (MOG35-55) induziert. Es konnte gezeigt werden, dass die Gabe von Dexamethason (Dex) den Krankheitsverlauf dosisabhängig verbessert. Die Untersuchung heterozygoter GR Knock-out Mäuse und hämatopoetischer Stammzellchimären verdeutlichte, dass der zytosolische GR (cGR) für die Vermittlung therapeutischer GC-Effekte von sehr großer Bedeutung ist. Der Einsatz zelltyp-spezifischer GR-defizienter Mäuse zeigte auf zellulärer Ebene, dass für die Vermittlung von GC-Wirkungen die Expression des GR vor allem in T-Zellen unabdingbar ist, wohingegen die GR-Expression in myeloiden Zellen in diesem Kontext keine Bedeutung hat. Durch die Analyse des molekularen Mechanismus konnte festgestellt werden, dass diese Effekte durch Apoptoseinduktion und Herunterregulieren von Adhäsionsmolekülen in peripheren, aber nicht ZNS-residenten T-Zellen erzielt wurden. Überdies wurde ersichtlich, dass Dex die T-Zellmigration in das ZNS verhinderte. Diese Beobachtung unterstützt die Hypothese, dass Dex durch Apoptoseinduktion und Immunmodulation hauptsächlich auf periphere T-Zellen wirkt und somit den ständigen Influx neuer Immunzellen in das ZNS verhindert. Ferner konnte in dieser Arbeit gezeigt werden, dass die therapeutische Gabe hochdosierten Methylprednisolons (MP) in diesem EAE-Modell ebenfalls zu einer dosisabhängigen Verbesserung der EAE führte. Diese beruhte auf einer reduzierten Lymphozyteninfiltration in das ZNS, war allerdings im Vergleich zur Dex-Therapie aufgrund geringerer Wirkpotenz weniger stark ausgeprägt. Im Gegensatz dazu führte die präventive MP-Applikation zu einem verstärkten EAE-Verlauf, der nach der Beeinflussung peripherer, hämatopoetischer Immunzellen auf eine verstärkte Proliferation autoreaktiver T-Zellen zurückzuführen ist. Im weiteren Verlauf der vorliegenden Arbeit wurde als möglicher Ersatz für die Hochdosis-GC-Pulstherapie eine nicht-steroidale, antiinflammatorische Substanz im chronischen EAE-Modell der C57Bl/6 Maus etabliert. Erste tierexperimentelle Untersuchungen mit Compound A (CpdA) offenbarten eine lediglich geringe therapeutische Breite dieser Substanz, wobei innerhalb pharmakologischer Dosierungen dennoch therapeutische Wirkungen vermittelt werden konnten. Anhand von in vitro Experimenten konnte eindeutig nachgewiesen werden, dass CpdA GR-unabhängig Apoptose induzierte, wobei Immunzellen und neuronale Zellen gegenüber CpdA besonders empfindlich reagierten. Der Einsatz T-Zell-spezifischer GR-defizienter Mäuse konnte zeigen, dass CpdA für die Vermittlung therapeutischer Wirkungen den cGR benötigt. Ferner wurde offensichtlich, dass CpdA in Abwesenheit des cGR in T-Zellen eine signifikante Verschlechterung der EAE verursachte. Durch die Anwendung physikochemischer Analysenmethoden, wie der Massenspektrometrie und 1H-NMR-Spektroskopie, konnte festgestellt werden, dass CpdA in vitro in gepufferten Medien in eine zyklische, chemisch sehr reaktive Verbindung (Aziridin) metabolisiert wird. Diese kann sehr wahrscheinlich für die Apoptose-Induktion in Zellen und die in Mäusen beobachteten neurotoxischen Ausfallerscheinungen verantwortlich gemacht werden. Durch chemische Analysen konnte in vitro in wässriger CpdA-Lösung ein weiterer Metabolit, das sympathomimetisch wirksame Synephrin, identifiziert werden. Um die Wirksamkeit adrenerger Substanzen in vivo zu testen, wurde das ß1/2-Sympathomimetikum Isoproterenol appliziert. Dieses verbesserte die EAE-Symptomatik, was sehr wahrscheinlich auf eine reduzierte Antigenpräsentation und einer damit verbundenen verminderten T-Zellinfiltration in das ZNS zurückzuführen ist.