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Institut
- Theodor-Boveri-Institut für Biowissenschaften (478) (entfernen)
Sonstige beteiligte Institutionen
- Institut für Tierökologie und Tropenbiologie (2)
- Boehringer Ingelheim Pharma GmbH & Co. KG (1)
- Deutsches Krebsforschungszentrum Heidelberg (1)
- ESPCI Paris (1)
- European Molecular Biology Laboratory, Heidelberg, Germany (1)
- Fachgebiet für Populationsgenomik bei Nutztieren, Universität Hohenheim (1)
- Klinische Mikrobiologie am Universitätsklinikum Erlangen (1)
- König-Ludwig-Haus, Orthopedic Clinic, Würzburg (1)
- Landesbetrieb Landwirtschaft Hessen, Bieneninstitut Kirchhain (1)
- Lehrstuhl für Tierökologie und Tropenbiologie, Universität Würzburg (1)
- Michigan State University (1)
- National Park "Bavarian Forest" (1)
- Roche Diagnostics GmbH Penzberg (1)
- Technische Hochschule Nürnberg Georg Simon Ohm (1)
- Technische Universität Darmstadt (1)
- Universität Duisburg-Essen, Institut für Molekularbiologie, AG Becker-Flegler (1)
ResearcherID
- J-8841-2015 (1)
- N-2030-2015 (1)
EU-Projektnummer / Contract (GA) number
- 311781 (1)
The genetics of species differences is an outstanding question in evolutionary biology. How do species evolve to become phenotypically distinct and how is the genetic architecture organized that underlie species differences? Phenotypic diverged traits are supposed to be frequently involved in prezygotic isolation, i.e. they prevent the formation of hybrids, whereas postzygotic isolation occurs when hybrids experience a fitness reduction. The parasitic wasp genus Nasonia represents an appropriate model system to investigate the genetics of species differences as well as the genetics of postzygotic isolation. The genus consists of three species N. vitripennis, N. longicornis and N. giraulti that differ particularly in male traits that are assumed to posses an adaptive significance: courtship behaviour and wing size differences. The courtship behaviour consists of cyclically repeated series of head nods that are separated by pauses. The stereotypic performance allowed to split up the display into distinct courtship components. Males of N. vitripennis bear vestigial forewings and are incapable of flight, whereas N. longicornis wear intermediate sized wings and N. giraulti is fully capable of flying. Nasonia species can produce interspecific hybrids after removing Wolbachia bacteria induced hybrid incompatibilities with antibiotics. Postzygotic isolation occurs to different extent and is asymmetric among reciprocal crosses, e.g. inviability is stronger in the N. vitripennis (♀) x N. longicornis (♂) cross than in the N. longicornis (♀) x N. vitripennis (♂) cross. The formation of hybrids allow to study the genetic of species differences in QTL (quantitative trait locus) analyses as well as the genetics of postzygotic isolation causing hybrid inviability. The aim of the study was to investigate the genetic architecture of differences in courtship behaviour and wing size between N. vitripennis and N. longicornis and to assess the genetics of postzygotic isolation to gain clues about the evolutionary processes underlying trait divergence and establishment of reproductive isolation between taxa. In a QTL analysis based on 94 F2-hybrid individuals of an LV cross only few QTL for wing size differences have been found with relatively large effects, although a large proportion of the phenotypic variance remained unexplained. The QTL on courtship behaviour analysis based on 94-F2 hybrid males revealed a complex genetic architecture of courtship behaviour with QTL of large phenotypic effects that explained more than 40 % of the phenotypic variance in one case. Additionally, an epistatic analysis (non-additive interlocus interaction) of courtship QTL revealed frequent genetic interchromsomal relations leading in some instances to hybrid specific effects, e.g. reversion of phenotypic effects or the transgression of phenotypes. A QTL analysis based on a threefold sample size revealed, however, an overestimation of QTL effects in the analysis based on smaller sample size pointing towards a genetic architecture of many loci with small effects governing the phenotypic differences in courtship behaviour. Furthermore, the the study comprised the analysis of postzygotic isolation in the reciprocal crosses N. vitripennis (♀) x N. longicornis (♂) versus N. longicornis (♀) x N. vitripennis (♂) located several loci distributed over different chromosomes that are involved in hybrid incompatibility. The mapping of hybrid incompatibility regions reproduced for the first time the observed asymmetries in the strength of postzygotic isolation in reciprocal crosses of between the more distant related taxa within the genus Nasonia. Stronger postzygotic incompatibilities in the VL cross are supposed to result from the superposition of nuclear-nuclear incompatibilities with nuclear-cytoplasmic incompatibilities, whereas the coincidences of these to types of incompatibilities were found to be much weaker in the reciprocal LV cross.
The genus Pogonomyrmex is predisposed for analyzing the evolution of ant colony characteristics in general and the sociogenetic structure in particular, due to the renowned biology of several species and the diversity of mating frequency and queen number. This variation in the sociogenetic structure of colonies produces a high variance in intracolonial relatedness which can be a major component driving the evolution of various colony characteristics. To exactly determine the variability of the intracolonial relatedness in the genus Pogonomyrmex both were analyzed, the number of matrilines and patrilines, in selected members of Pogonomyrmex, namely P. (sensu stricto) rugosus, P. (sensu stricto) badius and P. (Ephebomyrmex) pima using DNA fingerprint techniques. The evolution of these colony characteristics were tried to be explained within a phylogenetic framework. For that purpose we constructed a gene-tree of 39 species of the genus Pogonomyrmex. The taxon sampling covered about 83 % of the North American species and 43 % of the South American species. Effective multiple mating of queens was confirmed for P. rugosus (me=4.1) and P. badius (me=6.7). Additionally, both species are monogynous. These results corroborate behavioral observations of multiple mating for these species. Multiple mating is now known from 9 Pogonomyrmex species (behavioral evidence for 3 species – genetic evidence for 6 species). However, in P. (E.) pima all queens that were analyzed were single mated (me=1.0). Therefore, multiple mating may have either evolved early during the evolution of the genus Pogonomyrmex and has subsequently been lost in the subgenus Ephebomyrmex (plesiomorphic hypothesis), or it has first been evolved in the subgenus Pogonomyrmex sensu stricto (apomorphic hypothesis). In P. huachucanus, a species basal to the North- American sensu stricto complex, smaller effective mating number of queens compared to its sensu stricto relatives (J. Gadau and C.-P. Strehl, unpublished) probably do mirror a change from monandry to polyandry during the evolution of more advanced sensu stricto species, which would support the apomorphic hypothesis. The intracolonial relatedness in P. (E.) pima is however rather low. This is probably the result of multiple reproducing queens (polygyny). Polygyny is also documented for at least four other species of the subgenus Ephebomyrex, but so far P. (E.) pima is the only species with genetic evidence. It might be that there was an evolutionary trade-off within the subgenus Ephebomyrmex between polyandry and polygyny. Therefore, both subgenera retained a high intracolonial genetic diversity. This high genetic diversity might be one cause for the success and radiation of the genus Pogonomyrmex in arid environments. Evolution might have favored high genetic diversity of Pogonomyrmex colonies, because it helps colonies to improve their colonial organization and efficiency in performing external tasks. At least in P. badius a link between patrilines and physical polyethism was found, indicative of an improvement of colonial organization via polyandry. Furthermore, the documented extreme levels of polyandry might help P. badius females to overcome the possibility of inbreeding due to restricted dispersal. Restricted dispersal is also found in P. (E.) pima due to wingless, intermorphic queens. However, in P. (E.) pima inbreeding is probably prevented by outcrossing via males because no significant inbreeding is found. In the presented gene trees the subgenus Pogonomyrmex Ephebomyrmex was separated from the subgenus Pogonomyrmex sensu stricto. Therefore, P. Ephebomyrmex might be elevated to generic status, also due to its distinct morphological and life history characters. Nevertheless, for a precise taxonomic revision a broader complement of species has to be applied. Regularly a low number of unrelated workers was found in P. rugosus colonies, which probably stem from brood raids between mature and founding colonies. It is well known that most founding colonies are destroyed by neighboring conspecific mature colonies, but so far it was assumed that the brood of these colonies was also destroyed. This often neglected aspect might be an important fitness token for mature colonies.
Corynebacterium glutamicum is together with C. callunae and C. efficiens a member of the diverse group of mycolic-acid containing actinomycetes, the mycolata. These bacteria are potent producer of glutamate, lysine and other amino acids on industrial scale. The cell walls of most actinomycetes contain besides an arabinogalactan-peptidoglycan complex large amounts of mycolic acids. This three-layer envelope is called MAP (mycolyl-arabinogalactan-peptidoglycan) complex and it represents a second permeability barrier beside the cytoplasmic membrane similar to the outer membrane of Gram-negative bacteria. In analogy to the situation in the outer membrane of Gram-negative bacteria, channels are present in the mycolic acid layer of the mycobacterial cell wall for the passage of hydrophilic solutes. Molecular studies have provided far-reaching findings on the amino acid flux and its balance in C. glutamicum in general, but the L-glutamate export still remains unknown. The properties of the outer layers, typical of mycolata, seem to be of major importance in this process, and diffusion seems to play a key role for this part of the cell wall. The major aim of this thesis was to identify and study novel channel-forming proteins of the amino acid producers C. glutamicum, C. callunae and C. efficiens. Cell wall extracts of the organisms were investigated and a novel pore-forming protein, named PorH, that is homologue in all three organisms, was detected and characterized. PorHC.glut was isolated from C. glutamicum cells cultivated in minimal medium. The protein was identified in lipid bilayer experiments and purified to homogeneity by fast-protein liquid chromatography across a HiTrap-Q column. The purified protein forms cation-selective channels with a diameter of about 2.2 nm and an average single-channel conductance of about 2.5 nS in 1 M KCl in the lipid bilayer assay. Organic solvent extracts were used to study the permeability properties of the cell wall of C. callunae and C.efficiens. The cell extracts contained channel-forming activity, the corresponding proteins were purified to homogeneity by fast-protein liquid chromatography across a HiTrap-Q column and named PorHC.call and PorHC.eff. Channels formed by PorHC.call are cation-selective with a diameter of about 2.2 nm and an average single-channel conductance of 3 nS, whereas PorHC.eff forms slightly anion selective channels with an average single-channel conductance of 2.3 nS in 1 M KCl in the lipid bilayer assay. The PorH proteins were partially sequenced and the corresponding genes, which were designated as porH, were identified in the published genome sequence of C. glutamicum and C. efficiens. The chromosome of C. callunae is not sequenced, but PorHC.call shows a high homology to PorHC.eff and PorHC.glut. The proteins have no N-terminal extension, only the inducer methionine, which suggests that secretion of the proteins could be very similar to that of PorAC.glut of C. glutamicum. PorHC.glut is coded in the bacterial chromosome by a gene that is localized in the vincinity of the porAC.glut gene, within a putative operon formed by 13 genes that are encoded by the minus strand. Both porins are cotranscribed and coexist in the cell wall, which was demonstrated in RT-PCR and immunological detection experiments. The arrangement of porHC.glut and porAC.glut on the chromosome is similar to that of porBC.glut and porCC.glut and it was found that PorAC.glut, PorHC.glut, PorBC.glut and PorCC.glut coexist in the cell wall of C. glutamicum. The molecular mass of about 6 kDa of the PorH channel forming proteins is rather small and suggests that the cell wall channels are formed by oligomers. A possibly hexameric form was demonstrated for PorHC.glut in Western blot analysis with anti- PorHC.glut antibodies. Secondary structure predictions for PorHC.glut, PorHC.call and PorHC.eff predict that a stretch of about 42 amino acids of PorHC.glut and 28 amino acids of PorHC.call and PorHC.eff forms amphipathic -helices with a total length of 6.3 nm and 4.2 nm respectively. This should be sufficient to cross the mycolic acid layer. Another objective of this work was to establish an heterologous expression system for corynebacterial channel-forming proteins, to investigate the channel-forming properties of the up to now only hypothetical porins PorA, PorB, PorC from C. efficiens and PorC from C. glutamicum. We could demonstrate with recombinant expression experiments in E. coli that porBC.eff and porCC.eff encode for channel-forming proteins. They are, like PorBC.glut, anion-selective with a similar single-channel conductance of 1 nS in 1 M KCl.
Rhodococcus equi is a Gram-positive intracellular pathogen which can cause severe bronchopneumonia in foals. In recent years, the role of this bacterium as human pathogen has been noted, as R.equi infections in humans have increase in frequency. This increase is associated with the rise in immunosupressed individuals, specially AIDS patients, where infection leads to symptoms and pathology similar to those seen in foals with a high mortality rate. Due to its capability to survive and multiply in murine and equine macrophages, R.equi has been classified as a facultative intracellular bacterium. R.equi is found frequently in macrophages in alveolar infiltrate from infected animals. The pathogenicity of R.equi depends on its ability to exist and multiply inside macrophages and has been associated with the presence of virulence plasmids. It has been observed that, inside foal alveolar macrophages, R.equi-containing vacuoles (RCVs) do not mature into phagolysosomes. However, most of the intracellular events during R.equi infection have not been investigated in detail. The aim of this study was to elucidate the intracellular compartmentation of R.equi and the mechanism by which the bacteria avoid destruction in host macrophages. The importance of the virulence-associated plasmids of R.equi for the establishment of RCVs was also evaluated. Furthermore, the intracellular fate of viable and non-viable R.equi was compared in order to study whether viability of R.equi influeciantes the establishment of RCVs. In this study, the RCV was characterized by using a variety of endocytic markers to follow the path of the bacteria trhough murine macropages. Transmission electron microscopy-base analysis showed that R.equi was found equally frequently in phagosomes with loosely or thightly apposed membranes, and RCV often contains numerous membranous vesicles. Laser scanning microscopy of infected macrophages showed that the majority of phagosomes containing R.equi acquired transiently the early endosomal markers Rab5, Ptlns3P, and EEA-1, suggesting initially undisturbed phagosome maturation. Although the RCV acquired some late endosomal markers, such as Rab7, LAMP-1, and Lamp-2, they did not acquired vATPase, did not interact with pre-labeled lysosomes, and failed to acidify. These data clearly suggest that the RCV is a compartment which has left vacuoles that resemble multivesicular body compartments (MVB), which are transport intermediates between early and late endosomes and display internal vesicles very similar to the ones observed within RCVs. Analyisis of several R.equi strains containing either VapA- or VapB-expressing plasmids or neither demonstrated that the possession of the virulence-associated plasmids does not affect phagosome trafficking over a two hour period of infection. The finding that non-viable R.equi was still able to inhibit phagosome maturation (although not to the same extent as viable R.equi did) suggests that heat-insensitive factors, such as cell periphery lipids, may play a major role in inhibition of phagosome maturation, although heat-sensitive factors may also be involved.
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.
Cloning and functional characterization of novel genes expressed preferentially in the human retina
(2005)
The human retina is a multi-layered neuronal tissue specialized for the reception and processing of visual information. The retina is composed of a great diversity of neuronal cell types including rod and cone photoreceptors, bipolar cells, ganglion cells, amacrine cells, horizontal cells and Müller glia. In response to light, a coordinated series of molecular events, the so-called phototransduction cascade, is triggered in photoreceptor cells and the signals from the photoreceptors are further processed by the bipolar and ganglion cells to the higher centers of the brain. The retina as highly complex system may be greatly susceptible to genetic defects which can lead to a wide range of disease phenotypes. Therefore, isolation and characterisation of the genes active in the human retina will facilitate our deeper understanding of retinal physiology and mechanisms underlying retinal degeneration and provide novel candidates for the retinal disease genes. To identify novel genes that are specifically or predominantly expressed in the human retina, a cDNA library enriched for retina specific transcripts was generated using suppression subtractive hybridization (SSH) technique. In total, 1113 clones were randomly isolated from the retina SSH cDNA library and partially sequenced. On the basis of BLASTN algorithm analysis these clones were classified into four categories including those with I) significant homology to known human genes (766/1113), II) significant homology to partial transcripts and hypothetical gene predictions (162/1113), III) no homology to known mRNAs (149/1113), and IV) vector sequences and clones derived from mitochondrial genes (36/1113). After correcting for redundancy, category I represented 234 known human genes and category II a total of 92unknown transcripts. Clones from category I, were selected for expression analysis by RT-PCR in a great number of human tissues. This resulted in the identification of 16 genes which were expressed exclusively in the retina, 13 which were highly expressed in the retina compared to other tissues, 12 genes which were specifically expressed in neuronal tissues and 48 ubiquitously expressed genes. Thus, our expression analysis resulted in the identification of 29 genes exclusively or abundantly transcribed in the human retina. Of those, retina specific genes L25,L33, L35, L37, L38 and L40 were selected for further analysis. To characterize the complete mRNA sequences of these transcripts a full-length human retina cDNA library was constructed. The analysis of the L25 gene revealed three splicing variants of the ABCC5 gene, consequently named ABCC5_SV1 (SV1), ABCC5_SV2 (SV2) and ABCC5_SV3 (SV3).These isoforms comprise the first five exons of ABCC5 and additional novel exons named 5a, 5b and 5c, generated by differential exon usage. The determined lengths of the three transcripts are 2039 bp, 1962 bp, and 1887 bp in size, respectively. RT-PCR, real-time PCR and Northern blot analysis of ABCC5 as well as the isoforms SV1, SV2 and SV3demonstrated high levels of expression for all transcripts in the retina compared to other tissues. Analysis of their nucleotide sequences revealed that inclusion of exon 5a in splicing variant SV1 produced a frame shift and premature termination codon (PTC). Our data show that this splice variant is the target of nonsense mediated mRNA decay (NMD). This was shown by inhibition of protein synthesis with antibiotics puromycin and anisomycin in human cell lines A-RPE 19 and Y79. Our analysis resulted in an increase of the PTC containing transcript and a decrease of the ABCC5 transcript. Conversely, the amount of both transcripts (SV1 and ABCC5) returned to pre-treatment levels after removal of the inhibitors. Together, our results suggest that alternative splicing of the ubiquitously expressed ABCC5 gene in addition to NMD is involved in retina-specific transcriptional regulation of the mRNA level of ABCC5. In contrast, additional experiments demonstrated that the levels of expression ofSV2 and SV3 isoforms do not appear to influence ABCC5 transcription. Several of the cloned genes were selected for additional genotyping of single nucleotide polymorphisms (SNPs) in order to construct their SNP maps which are going to be used for future association studies of complex disease AMD. Thus, identification of novel retinal genes and their functional characterization will further our elucidation of retinal physiology in general and in the diseased state in particular, by providing candidate retinal disease genes.
BMPs influence a variety of cellular processes. They have been shown to regulate proliferation, differentiation, migration and apoptosis and thus play central roles during developmental processes and tissue homeostasis. Ligand mediated signal transduction is transmitted via BMP type I and BMP type II receptors, both members of the serine/threonine kinase superfamily. The BMP receptor mediated signal transduction is not explored in detail. Therefore our aim was to address different aspects of BMP mediated signal transduction with main focus on BRII and its regulation. Due to the existence of two alternative splice variants, a long and a short form, the function of the two variants and the impact of the C-terminal extension are of general interest. Moreover, mutations in the BMPR2 gene were identified to be responsible for PPH, a autosomal dominant lung disease. In this thesis, BRII phosphorylation and signalling mediated by different receptor oligomers were investigated and multiple BRII associated proteins were identified. We could show that the oligomerization pattern of BMP receptors exhibits a higher degree of flexibility compared to other receptors of that superfamily. In the present work the BMP2 mediated signal transduction should be examined, depending on the receptor oligomerization pattern. Using kinase-deficient mutants, it could be demonstrated, that signalling via preformed BMP receptor complexes is mediated by the well characterized Smad1/5/8 pathway, whereas signalling initiated by BMP2 induced recruitment of the receptors activates the p38 pathway and leads to Alkaline Phosphatase production. To further study signalling events triggered directly from the BRII a proteomics-based screen for BRII associated proteins was performed. 53 associated proteins were found, the majority being signal transducing molecules, but in addition metabolic proteins, transcriptional regulators and others were identified. These proteins enable to gain a deeper insight in BMP mediated signalling. One of the interactors, the receptor tyrosine kinase c-kit, was characterized in more detail. It could be demonstrated, that BRII and c-kit form a complex in vitro and in vivo, and the interaction is enhanced upon BMP2 stimulation. 2D phosphopeptid mapping showed that BRII is phosphorylated at S757 upon activation of c-kit by SCF. Moreover, c-kit and its ligand SCF are modulating BMP2 pathways, by enhancing Smad1/5 phosphorylation, Smad-transcriptional activity, Alkaline Phosphatase production and expression of Cbfa1. All these pathways hint towards modulation of the osteoblast development via c-kit. Thus, we were able to develop a novel paradigm for the BMP2 meditated signalling. One of the initial triggers for BRII is the auto-phosphorylation of BRII. Here we analyze ligand-independent as well as ligand-dependent phosphorylation of BRII. Some phosphorylation sites in BRII were identified. The general phosphorylation occurs mostly on serines. S815, S818 and Y825 are identified targets of phosphorylation whose function is still unclear. However phosphorylation of S336 is demonstrated to be essential for BRII activation. The elucidation of BMP receptor phosphorylation and oligomerization as well as the impact of a number of BRII associated proteins (such as c-kit), demonstrated in this thesis that BMP signalling has to be regulated precisely on multiple levels. This can be useful for the development of selective signalling inhibitors for basic research and therapeutic approaches of PPH and other diseases.
The hoatzin (Opisthocomus hoazin) is an enigmatic bird that lives in the riparian lowlands of northern South America. Among its peculiar attributes are 1) microbial foregut fermentation, unique in birds, to convert plant cellulose in the foliage which it consumes into simple sugars, 2) an ongoing debate about the puzzling taxonomic position, although a relationship to the Cuculiformes appears likely, 3) adaptive wing claws in the young which are used for climbing, and 4) co-operative breeding behaviour. Despite the information available on digestive mode and taxonomy little has been published on its breeding biology and behaviour and until now almost all knowledge was based on a study in the savannah of Venezuela. This is the first detailed study of the hoatzin’s nesting ecology in a rainforest habitat. From 1995-1998 and in 2000 I monitored a hoatzin population which consisted of approximately 700 individuals in an Amazonian rainforest in Ecuador situated in the Cuyabeno Wildlife Reserve (between 0°02’ N, 76°0’ W, 0°03’ S, and 76°14’ W). The area is composed of various black water lagoons and small rivers, flooded forests and terra firme forest. Primarily, I examined group composition and breeding pattern and success related to traits such as clutch and egg size, offspring sex ratio and the number of parents involved in a common breeding attempt. Apart from standardised observations and monitoring I took blood samples from chicks, which were later used for molecular sexing and for DNA fingerprints. Food plants were collected and determined and a rough habitat mapping was conducted. Since the impacts of boat tourism in the area became apparent I investigated the interactions of adult and young hoatzins with tourists and measured the plasma concentration of the hormone corticosterone in chicks as an indicator of stress. Each chapter has its own introduction to the specific topic and can be read independently. The main findings of this study are: The reproduction of the hoatzin was timed strictly following the bimodal rainy pattern in the area. There was only one breeding attempt per year. Only 18% of breeding attempts ended successfully with at least one fledgling. Incubation started with the first egg laid and led to hatching asynchrony. In most cases only the A-chick survived and there is evidence for a brood reduction strategy. I observed egg size variation patterns both within the clutches and between the clutches. Approximately 80% of breeding attempts were carried out with auxiliaries. Units with alloparentals had a higher breeding success than single pairs. The results indicate a trade-off between helping and group size. DNA band-sharing comparisons revealed the existence of joint-nests, where several females laid their eggs in one single nest. The clutches of these joint-nests suffered severe egg loss during all stages of incubation. Breeding success did not differ between single- and joint-nests. The primary offspring sex ratio was biased towards daughters. There was no differential mortality between the sexes until fledging. Individual breeding units employed an adaptive production of offspring of each sex according to their current group size. Rainforest tourism negatively influenced the survival and growth of young, not yet fledged hoatzins. In addition tourist-exposed young showed a stronger hormonal stress response than their conspecifics from undisturbed sites. In contrast, breeding adults appear to have habituated to tourist boats and exposure to observers.
The bacteriophage Lambda is a virus which infects bacteria carrying LamB protein in their outer membrane. GpJ, a protein of the tail of the phage, is involved in the binding to LamB. The study of the interaction between GpJ expressed as fusion protein and LamB was performed in order to investigate the interaction between the bacteriophage Lambda and LamB. The fusion proteins are called MBP-gpJ and His-gpJ. MBP-gpJ is a chimeric protein representing Maltose Binding Protein connected to the Cterminal part of the GpJ protein (residue 684 until 1132), graciously given by Pr. Charbit (Paris, France). MBP-gpJ, expressed in E.coli and purified, bound to the exoplasmic side of LamB and LamB variants in planar lipid bilayer experiments and allowed a complete and reversible blockage of LamB channels. In order to obtain data about the binding of the GpJ fragment alone to LamB, an other fusion protein without MBP was created, called His-gpJ. His-gpJ is the C-terminal part of GpJ (684-1132) in fusion with a 6×Histidine-tag, produced as insoluble form in E.coli. After renaturation, a soluble protein can be obtained. Without MBP, the GpJ fragment still bound to LamB in planar lipid bilayer experiments, but did not block significantly its channels, as previously observed after addition of MBP-gpJ. The interaction between His-gpJ and LamB or LamB mutants was also demonstrated on SDSPAGE and immunodetection by the presence of high molecular mass bands. Furthermore, the use of variants of lamB allowed to demonstrate that the C-terminal fragment of GpJ does not bind to the same area on the surface of LamB than GpJ involved in the tail of the Lambda phage.
This study investigates the abundance and geographic distribution of the hawkmoth species (Lepidoptera: Sphingidae) of Southeast-Asia and analyses the resulting patterns of biodiversity, biogeography and macroecology. Data on the distribution of species were retrieved from published and unpublished faunal lists and museum collections (in close cooperation with the Natural History Museum, London). Over 34,500 records of the global distribution of the 380 species that occur in Southeast-Asia (including New Guinea and the Solomon Islands) were used for a GIS-supported estimate of distributional ranges, which can be accessed at http://www.sphingidae-sea.biozentrum.uni-wuerzburg.de, an Internet site that also provides pictures of the species and checklists for 114 islands of the Malesian region. The abundance of species in local assemblages was assessed from nightly collections at artificial light sources. Using a compilation of own samples as well as published and unpublished data from other sources, local abundance data on 93 sites were used for analysis, covering 159 species or 17,676 specimens.