570 Biowissenschaften; Biologie
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- HSFA2 (2)
- Habitat loss (2)
- Hamiltonella defensa (2)
- Hantavirus (2)
- Haptene (2)
- HeH-protein (2)
- Heart development (2)
- HepG2 (2)
- Herb layer (2)
- Herbicide risk assessment (2)
- Heterosis (2)
- Hill numbers (2)
- Hippo signaling (2)
- Holocene (2)
- Holocene environmental history (2)
- Home range (2)
- Homeostasis (2)
- Honigbiene (2)
- HopZ1a (2)
- Hybrid speciation (2)
- Hybridisation capture (2)
- Hydrogel (2)
- Hydrogele (2)
- Hypoxie (2)
- IC (2)
- IDP (2)
- Iambic/Trochaic Law (2)
- Illumina amplicon sequencing (2)
- Illuminance (2)
- Immobilisierung (2)
- Immunoassay (2)
- InP (2)
- InPZnS (2)
- India (2)
- Individual-based modeling (2)
- Inflammation (2)
- Influenza A virus (2)
- Insect (2)
- Insulin resistance (2)
- Interdigitated electrodes (2)
- Interoception (2)
- Interspecific interactions (2)
- Introgression (2)
- Intuitive eating (2)
- Invagination (2)
- Ionentransport (2)
- Island biogeography (2)
- Isoflavone (2)
- Isolation (2)
- JUB1 (2)
- Japan (2)
- June 2013 flood (2)
- Jurkat cells (2)
- Just so stories (2)
- Kartoffel (2)
- Kernhülle (2)
- Kettle holes (2)
- Klimaänderung (2)
- Koexpression (2)
- Konnektivität (2)
- Korrelationsanalyse (2)
- Körperfett (2)
- Körperzusammensetzung (2)
- LC–MS/MS (2)
- LEA protein (2)
- LEM-domain protein (2)
- LMA (2)
- LPS (2)
- Lake (2)
- Lamin (2)
- Land use (2)
- Land-use history (2)
- Landscape (2)
- Landscape of fear (2)
- Landschaft der Angst (2)
- Large fragment deletion (2)
- Late Quaternary vegetation (2)
- Leaf senescence (2)
- Leopards (2)
- Limnology (2)
- Lipases (2)
- Lipidomics (2)
- Lysophosphatidylcholine (2)
- Lythrum salicaria (2)
- MADS-domain transcription factor (2)
- MAPK (2)
- MED16 (2)
- MHC (2)
- MSAP (2)
- Manganese (2)
- Markov cluster algorithm (2)
- Martini force-field (2)
- Mate choice (2)
- Maus (2)
- Mechanotransduction (2)
- Medicago truncatula (2)
- Meiosis (2)
- Melampyrum pratense (2)
- Membranproteine (2)
- Mesenchymal stem cells (2)
- Metabolismus (2)
- Metabolit (2)
- Metabolite (2)
- Metaboliten (2)
- Metabolites (2)
- Metabolom (2)
- Metabolomik (2)
- Metal Metabolism (2)
- Metschnikowia (2)
- Microarrays (2)
- Microbial ecology (2)
- Microbiology (2)
- Microcystin (2)
- Microcystis aeruginosa (2)
- Microsatellite analysis (2)
- Mikroorganismen (2)
- Mikrosatelliten (2)
- Mindfulness (2)
- Mitochondrial DNA (2)
- Mitochondrien (2)
- Mitogenome (2)
- Mitogenomes (2)
- Mitose (2)
- Mitosis (2)
- Mixed mating (2)
- Mixed methods (2)
- Modell (2)
- Molekularbiologie (2)
- Molybdänkofaktor (2)
- Monoclonal antibodies (2)
- Monoclonal antibody (2)
- Monte Carlo method (2)
- Morphology (2)
- Multiplex (2)
- Multiplex mutagenesis (2)
- Muntjac (2)
- Mutation rate (2)
- Mutator locus (2)
- Mykotoxine (2)
- NAB (2)
- NE Germany (2)
- NMR spectroscopy (2)
- NMR structure (2)
- NRPS (2)
- NZO (2)
- Nahrungsnetz (2)
- Namibia (2)
- Nanostruktur (2)
- Network clustering (2)
- Netzwerke (2)
- Neurotoxicity (2)
- Nighttime illumination (2)
- Nitrat (2)
- Nitrogen deposition (2)
- Northern Asia (2)
- Norway (2)
- Nostoc punctiforme (2)
- Nucleus (2)
- NutriAct Family Study (2)
- Nutrition (2)
- O-serotyping (2)
- OMICs tools (2)
- Offspring weight (2)
- Ohrid-Prespa region (2)
- Older adults (2)
- Optogenetik (2)
- Organogenesis (2)
- Orthologous Matrix (OMA) Project (2)
- Outcrossing (2)
- Outcrossing rate (2)
- Outdoor enclosure (2)
- PBPK (2)
- PBS1 (2)
- PC-3 cells (2)
- PEI coating (2)
- PKS (2)
- PUFA (2)
- PXR (2)
- Palaeogenetics (2)
- Paläoökologie (2)
- Parasit (2)
- Parasitoid wasp (2)
- Partial Little Square (2)
- Partnership (2)
- Paternity analysis (2)
- Pathogen (2)
- Pathway design (2)
- Peptid (2)
- Periphyton (2)
- Periplaneta americana (2)
- Personality (2)
- Pex1 (2)
- Pex6 (2)
- Pflanze (2)
- Pflanzengemeinschaften (2)
- Pflanzenwachstum (2)
- PhIP (2)
- Phase variation (2)
- Phenole (2)
- Phosphat (2)
- Photosynthesis (2)
- Phylogenetics (2)
- Phylogenie (2)
- Phylogenomics (2)
- Pinus sylvestris (2)
- Pipistrellus nathusii (2)
- Plankton (2)
- Plant community model (2)
- Plant development (2)
- Plant-soil feedback (2)
- Plants (2)
- Plasma membrane (2)
- Plastid (2)
- Poecilia formosa (2)
- Poecilia latipinna (2)
- Polyadenylierung (2)
- Polyelektrolyt-Multischichten (2)
- Polyethylenglykol (2)
- Polysaccharide (2)
- Population dynamics (2)
- Predator-prey interactions (2)
- Pregnancy (2)
- Priming (2)
- Promiscuous enzymes (2)
- Promotor (2)
- Prostaglandin E2 (2)
- Proteinaggregation (2)
- Proteins (2)
- Proteomics (2)
- Pseudomonas aeruginosa (2)
- Puumala virus seroprevalence (2)
- QDs (2)
- R Shiny (2)
- RNA (2)
- RNA interference (2)
- RNA virus (2)
- RNA-guided Cas9 (2)
- RT-PCR (2)
- RUNX2 (2)
- Randomized-controlled trial (2)
- Raphidiopsis (2)
- Recombination (2)
- Redox marker (2)
- Redoxreaktion (2)
- Redoxregulation (2)
- Regulation (2)
- Rezeptor (2)
- Rice (2)
- Riesenvesikel (2)
- Rodent (2)
- Roridula gorgonias (2)
- Rotifera (2)
- RpoS (2)
- RubisCO (2)
- Russia (2)
- S-XRF (2)
- SELEX (2)
- SERS enhancement factor (2)
- SFON (2)
- SIMS techniques (2)
- SPB (2)
- SULT1A1 (2)
- SWL (2)
- Sailfin molly (2)
- Salmonella Typhimurium (2)
- Saprolegnia (2)
- Saprolegniaceae (2)
- Savannas (2)
- Schleudertrauma (2)
- Schmalwand <Arabidopsis> (2)
- Schwefel (2)
- Scopoletin (2)
- Seasonality (2)
- Sediment (2)
- Selenium (2)
- Senescence (2)
- Sequenzierung (2)
- Sequenzierung der nächsten Generation (2)
- Serine cycle (2)
- Sexual selection (2)
- Siberian tree line (2)
- Simulation (2)
- Simulationsmodell (2)
- Smpd1 (2)
- Soil (2)
- Soil function (2)
- Solanaceae (2)
- Space use (2)
- Specific wood density (2)
- Stickstoff (2)
- Strategic growth adjustment (2)
- Störung (2)
- Sulforaphan (2)
- Sulfotransferase (2)
- Sundaland (2)
- Sus scrofa (2)
- Säugetiere (2)
- TAS2R (2)
- TEM (2)
- TMS (2)
- TTR (2)
- Tailspike protein (2)
- Tanzania (2)
- Tas2r (2)
- Tas2rs (2)
- Temperate forest (2)
- Tenebrio molitor larvae (2)
- Tocopherol (2)
- Toll and Imd pathways (2)
- Tomate (2)
- Tomato (2)
- Transcription factors (2)
- Transcriptional memory (2)
- Transcriptome assembly (2)
- Transporters (2)
- Tree allometry (2)
- Turkey (2)
- TusA (2)
- Type 2 Diabetes (2)
- UV radiation (2)
- Ulcerative colitis (2)
- Urbanization (2)
- Ursus arctos (2)
- V-ATPase (2)
- Venom proteins (2)
- Verhalten (2)
- Verkhoyansk mountains (2)
- Virus (2)
- Wachstum (2)
- Walker A motif (2)
- Wastewater (2)
- Weakly electric fish (2)
- Weizen (2)
- Weißstorch (2)
- Wildschwein (2)
- Wind (2)
- Wood specific gravity (2)
- Woody aboveground biomass (2)
- X-ray structure (2)
- XMRV (2)
- Xpr1 (2)
- Yap1/Wwtr1 (Taz) (2)
- Zebrafish (2)
- Zelladhäsion (2)
- Zellkern (2)
- Zellweger (2)
- Zellweger syndrome spectrum disorder (ZSSD) (2)
- Zinypr-1 (2)
- Zweizustandsmodell (2)
- Zytoskelett (2)
- aberrations (2)
- accelerometer (2)
- acclimation (2)
- acid mine drainage (2)
- acoustic communication (2)
- actin polymerization (2)
- activated carbon (2)
- activator–inhibitor models (2)
- adaptive introgression (2)
- adaptive processes (2)
- adaptive radiation (2)
- adhesion (2)
- adiponectin (2)
- age (2)
- ageing (2)
- agricultural landscape (2)
- agrin (2)
- agro-infiltration (2)
- aldehyde oxidoreductase (2)
- alignment (2)
- alignment sensitivity / specificity (2)
- alkylierte polyzyklische aromatische Kohlenwasserstoffe (2)
- alkylphospholipids (2)
- all-cause mortality (2)
- allocation (2)
- alphaherpesvirus (2)
- alternative splicing (2)
- amino acid (2)
- amphibians (2)
- animal cognition (2)
- animal migration (2)
- anthropogenic environment (2)
- anthropogenic food subsidies (2)
- anthropometric measures (2)
- anthropometry (2)
- anti-oxidative response (2)
- antibody producing cell selection (2)
- antioxidant capacity (2)
- anxiety-like behavior (2)
- apis mellifera (2)
- apple (2)
- aquatic ecosystems (2)
- aqueous dispersion (2)
- aqueous-solution (2)
- arable land (2)
- arable weeds (2)
- arbuscular mycorrhizal symbiosis (2)
- archival DNA (2)
- area-based conservation (2)
- arsenic (2)
- arthropod (2)
- artificial light at night (ALAN) (2)
- ascorbate peroxidase (2)
- assembly (2)
- assembly processes (2)
- assembly rules (2)
- autocorrelation (2)
- automated radio telemetry (2)
- axillary bud (2)
- baltic sea (2)
- basal body (2)
- base excision repair (incision activity) (2)
- bat fatalities (2)
- behavior (2)
- behavioral plasticity (2)
- behavioral type (2)
- behavioural syndrome (2)
- benzylic alcohol (2)
- benzylischer Alkohol (2)
- beta diversity (2)
- bias (2)
- bifurcation (2)
- bifurcation theory (2)
- biodiversity conservation (2)
- biodiversity decline (2)
- biodiversity exploratories (2)
- biodiversity facets (2)
- biofortification (2)
- biogene Amine (2)
- biological age (2)
- biological control (2)
- biological invasions (2)
- biological soil crusts (2)
- biomarker detection (2)
- biomimetic sensors (2)
- biosignatures (2)
- biostimulant (2)
- biosynthesis (2)
- biotic filtering (2)
- biotin sulfoxide reductase (2)
- bisphosphonates (2)
- bitter (2)
- bitter taste receptors (2)
- body composition (2)
- body proportions (2)
- bone mineral density (2)
- bone pathologies (2)
- brackish waters (2)
- brain insulin signaling (2)
- branched chain amino acids (2)
- branching (2)
- breeding (2)
- buffer zones (2)
- bush encroachment (2)
- cAMP (2)
- cTBS (2)
- cadmium-free (2)
- caffeine (2)
- calcination (2)
- calcite (2)
- calcium (2)
- calcium carbonate inclusions (2)
- calcium imaging (2)
- calcium influx (2)
- canalization (2)
- cancer epidemiology (2)
- capture enrichment (2)
- carbohydrates (2)
- carbon dots (2)
- carbon isotopes (2)
- carbon labeling (2)
- cardiac development (2)
- cardiomyocyte (2)
- cardiomyogenic differentiation (2)
- carotenoid biosynthesis (2)
- carrion ecology (2)
- cascading effects (2)
- cave fish (2)
- cell adhesion (2)
- cell division (2)
- cell shape (2)
- cell signaling (2)
- cells (2)
- cellular bioenergetics (2)
- cellular bioimaging (2)
- cellulose polymeric organic matter (2)
- cerami-des (2)
- ceramides (2)
- cereal leaf beetle (2)
- cereal meals (2)
- chemostat experiments (2)
- child growth (2)
- chimeric transcription factors (2)
- chlamydomonas (2)
- chlorophyll a (2)
- chloroplast (2)
- chloroplasts (2)
- chronic diseases (2)
- chytridiomycota (2)
- cis-regulatory evolution (2)
- click chemistry (2)
- climate adaptation (2)
- climate dynamics (2)
- climate extremes (2)
- climate warming (2)
- co-expression (2)
- co-limitation (2)
- coefficient (2)
- coffee by-products (2)
- cold stress (2)
- collagen (2)
- colon carcinogenesis (2)
- colony viability (2)
- common‐garden experiment (2)
- community model (2)
- community structure (2)
- community theory (2)
- competition–defense trade‐off (2)
- comprehensive analysis (2)
- concepts (2)
- confocal microscopy (2)
- conformational change (2)
- conformational rearrangement (2)
- congeneric species (2)
- conscripts (2)
- constitutive activity (2)
- constraint-based modeling (2)
- converting factor (2)
- copper complex (2)
- copper(II) (2)
- copper-related disorders (2)
- cord blood (2)
- core shell UCNP (2)
- cori cycle (2)
- cortisol (2)
- counting (2)
- coviability analysis (2)
- crop (2)
- crop diversity (2)
- cropping system (2)
- cross-species capture (2)
- cryolithology (2)
- cryptomycota (2)
- cyanobacterial bloom (2)
- cyanobacterial sucrose-phosphatase (2)
- cytochrome c (2)
- cytoplasmic polyadenylation (2)
- cytosine methylation (2)
- cytosolic tRNA thiolation (2)
- cytotoxicity (2)
- dark virus (2)
- data integration (2)
- ddRAD (2)
- de novo genome assembly (2)
- dead Cas9 (2)
- decline (2)
- defense against predation (2)
- defensive symbiosis (2)
- degraded DNA (2)
- dehydration (2)
- demographic noise (2)
- depressive-like behavior (2)
- desiccation (2)
- design of experiment (2)
- developing brain (2)
- developmental canalization (2)
- developmental dyslexia (2)
- developmental plasticity (2)
- diacylglycerol (2)
- dietary patterns (2)
- dietary restriction (2)
- differential expression analysis (2)
- digestive enzymes quantification (2)
- dimerization of 4-nitrothiophenol (2)
- dispersal filtering (2)
- diversity profiles (2)
- dominance effect (2)
- drought stress (2)
- droughts (2)
- drug delivery (2)
- drug metabolism (2)
- drug release (2)
- dynamic equilibrium (2)
- eastern continental Asia (2)
- eavesdropping (2)
- echolocation (2)
- ecophysiology (2)
- ecosystem services provisioning (2)
- education (2)
- effectors (2)
- egg ratio (2)
- eicosapentaenoic acid (2)
- electric fish (2)
- electroencephalography (EEG) (2)
- electron microscopy (2)
- electron paramagnetic resonance (2)
- electronic tool integration (2)
- emotional imagery (2)
- emotions (2)
- endocardium (2)
- endothelial cell (2)
- endotoxin (2)
- energy expenditure (2)
- enrichment experiments (2)
- entropy (2)
- environmental DNA (2)
- environmental genomics (2)
- environmental noise (2)
- enzymology (2)
- epidemiology (2)
- epigenetic variation (2)
- epiphytes (2)
- epithionitrile (2)
- epitope prediction (2)
- epizoochory (2)
- equalizing and stabilizing mechanisms (2)
- error reduction (2)
- establishment (2)
- event coincidence analysis (2)
- evolutionary ecology (2)
- evolutionary rescue (2)
- expansion microscopy (2)
- exploitation (2)
- expression profile (2)
- extinction (2)
- extinction drivers (2)
- extra-cytoplasmic pockets (2)
- extracellular DNA (2)
- extracellular enzymes (2)
- extracellular matrix (2)
- extracellular signaling (2)
- eye-tracking (2)
- facilitation (2)
- fatty acid changes (2)
- feeding (2)
- feeding behaviour (2)
- fence interaction (2)
- fertilization (2)
- fetal origins hypothesis (2)
- fisheries (2)
- fitness gradient (2)
- fitness response (2)
- floating mat (2)
- flooded grasslands (2)
- floral scent (2)
- flow cytometry (2)
- fluorescent probe (2)
- food frequency questionnaire (2)
- food web dynamics (2)
- food webs (2)
- forage availability (2)
- forage gaps (2)
- foraging (2)
- foraging behaviour (2)
- forebrain (2)
- forest management (2)
- forestREplot (2)
- formaldehyde assimilation (2)
- formate dehydrogenase (2)
- fractionation (2)
- fractionation factors (2)
- fragmentation (2)
- free zinc (2)
- freshwater algae (2)
- freshwater heterotrophic bacteria (2)
- functional complementation (2)
- functional inhibitors of acid sphin-gomyelinase (2)
- functional response (2)
- functional richness (2)
- fungal diversity (2)
- fungal pathogens (2)
- funktionelle Diversität (2)
- galactolipids (2)
- gamma diversity (2)
- gas-production (2)
- gene delivery (2)
- generalized dissimilarity modelling (2)
- genetic accommodation (2)
- genetic adaptation (2)
- genetic engineering (2)
- genetic rescue (2)
- genetic screen (2)
- genetischer Screen (2)
- genome (2)
- genome scan (2)
- genomic prediction (2)
- geo-bio interaction (2)
- geographic distribution (2)
- glacial maximum (2)
- global and regional change (2)
- glucocorticoid receptor (2)
- glucose (2)
- glucosinolate hydrolysis (2)
- glutathione (2)
- glycine cleavage system (2)
- governance (2)
- grazing (2)
- gross primary production (2)
- groundwater (2)
- groundwater recharge (2)
- growth behavior (2)
- growth restriction (2)
- guard cell (2)
- gut microbiota (2)
- gwas (2)
- habitat (2)
- habitat selection (2)
- habitat use (2)
- habituation (2)
- heart regeneration (2)
- heat (2)
- heat shock protein (2)
- heliozoa (2)
- hepcidin-25 (2)
- heterocyclic aromatic amine (2)
- hilly loes plateau (2)
- histone modification (2)
- holding capability (2)
- holding isometric muscle action (HIMA) (2)
- holocene (2)
- honey bee (2)
- honey bees (2)
- hoverflies (2)
- human aldehyde oxidase (2)
- human endotoxemia (2)
- human excised skin (2)
- human introduction (2)
- human-wildlife conflict (2)
- hydrogels (2)
- hyena (2)
- hyperoxia (2)
- hypertension (2)
- hyperthermia (2)
- immunoassay (2)
- immunogenicity (2)
- importin (2)
- in silico (2)
- in vitro intestinal model (2)
- in-vitro-synthesis (2)
- inbreeding depression (2)
- indirect facilitation (2)
- individual based modeling (2)
- individual-based modeling (2)
- infancy (2)
- infiltration (2)
- inhibition (2)
- inner-mongolia (2)
- integrated assessments (2)
- inter-brain synchronization (2)
- inter-muscle-brain synchronization (2)
- interpersonal muscle action (2)
- interspecific interactions (2)
- intestinal mucins (2)
- intestinal zinc resorption (2)
- intra-organ-communication (2)
- intraguild predation (2)
- intraspecific variation (2)
- invasibility (2)
- invasion success (2)
- invasive species (2)
- ion channel (2)
- ion mobility spectrometry (2)
- ion transport (2)
- ion-exchange chromatography (2)
- ionic liquid (2)
- ionic strength (2)
- ionogel (2)
- iron-sulfur clusters (2)
- island biogeography (2)
- island disharmony (2)
- island syndromes (2)
- islands (2)
- isomerization (2)
- jasmonate (2)
- kelp (2)
- l-cysteine desulfurase (2)
- lake monitoring (2)
- lake periphyton (2)
- land sharing vs. land sparing (2)
- land use change (2)
- land-use change (2)
- landscape diversity (2)
- landscape generator (2)
- landscape homogenization (2)
- late pleistocene (2)
- later health (2)
- lichens (2)
- life cycle (2)
- life‐history traits (2)
- ligand exchange (2)
- light adaptation (2)
- light variability (2)
- limits (2)
- lipid classes (2)
- lipid limitation thresholds (2)
- lipid membranes (2)
- lipidomics (2)
- lipid–lipid interactions (2)
- lipoplexes (2)
- loci (2)
- lokale Anpassung (2)
- longitudinal (2)
- low-energy electrons (2)
- luminescence (2)
- lysosomal hydrolases (2)
- lysosomal storage disorders (2)
- lysosome (2)
- mRNA degradation (2)
- magnitude estimation (2)
- maintenance (2)
- maintenance of functional diversity (2)
- maintenance of genomic integrity (2)
- major histocompatibility complex (2)
- male Daphnia (2)
- maltooligosaccharides (2)
- mammalian-cells (2)
- manganese (2)
- manual muscle test (2)
- many-to-one genotype–phenotype map (2)
- mapping (2)
- mass conservation (2)
- mass index (2)
- mate-pairs (2)
- mathematical modelling (2)
- mathematical precursor (2)
- maturation (2)
- meal timing (2)
- mechanical (2)
- mechanical strength (2)
- mechanisms (2)
- mechanomyography (MMG) (2)
- mediated delivery (2)
- membrane biophysics (2)
- membrane fusion (2)
- membrane microdomains (2)
- membrane protein (2)
- membrane stabilization (2)
- memory (2)
- mercaptocarboxylic acids (2)
- mesenchymal stem cells (2)
- mesophyll cell (2)
- messenger-rna polyadenylation (2)
- meta-analysis (2)
- metabolic syndrome (2)
- metabolic-profiling (2)
- metabolische Netzwerke (2)
- metabolite (2)
- metagenome (2)
- metagenomic analysis (2)
- metagenomics 2.0 (2)
- metal complex (2)
- metal peptide (2)
- metallopeptide (2)
- metalloprotein (2)
- methane oxidation (2)
- methylotrophy (2)
- miRNAs (2)
- microarrays (2)
- microbial activity (2)
- microbial communities (2)
- microbiota (2)
- microclimate (2)
- microcomputed tomography (2)
- microeukaryotes (2)
- microfluidics (2)
- microstructure (2)
- microtubule-organization (2)
- mitochondrial genome (mtDNA) (2)
- mitogenomes (2)
- mixed cultures (2)
- model (2)
- model integration (2)
- model limitations (2)
- modeling (2)
- models (2)
- modern coexistence theory (2)
- mojave desert (2)
- molecular biology (2)
- molecular dynamics simulations (2)
- molecular evolution (2)
- molecular species identification (2)
- molybdoenzyme (2)
- molybdopterin synthase (2)
- morphology (2)
- movement speed (2)
- mucus layer (2)
- multidrug resistance (2)
- multiple sclerosis (2)
- multishell (2)
- multivalence (2)
- multi‐ year flooding cycle (2)
- muscle (2)
- musicality (2)
- mutation (2)
- mutual information (2)
- mycotoxins (2)
- myocardial infarction (2)
- myocardium (2)
- myoglobin (2)
- n-oxide reductase (2)
- nachhaltige Landnutzung (2)
- nanoelectrodes (2)
- nanogels (2)
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Institute
- Institut für Biochemie und Biologie (1792)
- Institut für Ernährungswissenschaft (239)
- Mathematisch-Naturwissenschaftliche Fakultät (120)
- Extern (82)
- Institut für Chemie (55)
- Institut für Geowissenschaften (38)
- Institut für Physik und Astronomie (34)
- Institut für Umweltwissenschaften und Geographie (31)
- Department Sport- und Gesundheitswissenschaften (14)
- Fakultät für Gesundheitswissenschaften (10)
Plants are unable to move away from unwanted environments and therefore have to locally adapt to changing conditions. Arabidopsis thaliana (Arabidopsis), a model organism in plant biology, has been able to rapidly colonize a wide spectrum of environments with different biotic and abiotic challenges. In recent years, natural variation in Arabidopsis has shown to be an excellent resource to study genes underlying adaptive traits and hybridization’s impact on natural diversity. Studies on Arabidopsis hybrids have provided information on the genetic basis of hybrid incompatibilities and heterosis, as well as inheritance patterns in hybrids. However, previous studies have focused mainly on global accessions and yet much remains to be known about variation happening within a local growth habitat. In my PhD, I investigated the impact of heterozygosity at a local collection site of Arabidopsis and its role in local adaptation. I focused on two different projects, both including hybrids among Arabidopsis individuals collected around Tübingen in Southern Germany. The first project sought to understand the impact of hybridization on metabolism and growth within a local Arabidopsis collection site. For this, the inheritance patterns in primary and secondary metabolism, together with rosette size of full diallel crosses among seven parents originating from Southern Germany were analyzed. In comparison to primary metabolites, compounds from secondary metabolism were more variable and showed pronounced non-additive inheritance patterns. In addition, defense metabolites, mainly glucosinolates, displayed the highest degree of variation from the midparent values and were positively correlated with a proxy for plant size.
In the second project, the role of ACCELERATED CELL DEATH 6 (ACD6) in the defense response pathway of Arabidopsis necrotic hybrids was further characterized. Allelic interactions of ACD6 have been previously linked to hybrid necrosis, both among global and local Arabidopsis accessions. Hence, I characterized the early metabolic and ionic changes induced by ACD6, together with marker gene expression assays of physiological responses linked to its activation. An upregulation of simple sugars and metabolites linked to non-enzymatic antioxidants and the TCA cycle were detected, together with putrescine and acids linked to abiotic stress responses. Senescence was found to be induced earlier in necrotic hybrids and cytoplasmic calcium signaling was unaffected in response to temperature. In parallel, GFP-tagged constructs of ACD6 were developed.
This work therefore gave novel insights on the role of heterozygosity in natural variation and adaptation and expanded our current knowledge on the physiological and molecular responses associated with ACD6 activation.
Analyzing mixture toxicity requires an in-depth understanding of the mechanisms of action of its individual components. Substances with the same target organ, same toxic effect and same mode of action (MoA) are believed to cause additive effects, whereas substances with different MoAs are assumed to act independently. Here, we tested 2 triazole fungicides, propiconazole, and tebuconazole (Te), for individual and combined effects on liver toxicity-related endpoints. Both triazoles are proposed to belong to the same cumulative assessment group and are therefore thought to display similar and additive behavior. Our data show that Te is an antagonist of the constitutive androstane receptor (CAR) in rats and humans, while propiconazole is an agonist of this receptor. Both substances activate the pregnane X-receptor (PXR) and further induce mRNA expression of CYP3A4. CYP3A4 enzyme activity, however, is inhibited by propiconazole. For common targets of PXR and CAR, the activation of PXR by Te overrides CAR inhibition. In summary, propiconazole and Te affect different hepatotoxicity-relevant cellular targets and, depending on the individual endpoint analyzed, act via similar or dissimilar mechanisms. The use of molecular data based on research in human cell systems extends the picture to refine cumulative assessment group grouping and substantially contributes to the understanding of mixture effects of chemicals in biological systems.
The cyanobacterial genus Microcystis is known to produce an elaborate array of structurally unique and biologically active natural products, including hazardous cyanotoxins. Cytotoxic aeruginoguanidines represent a yet unexplored family of peptides featuring a trisubstituted benzene unit and farnesylated arginine derivatives. In this study, we aimed at assigning these compounds to a biosynthetic gene cluster by utilizing biosynthetic attributes deduced from public genomes of Microcystis and the sporadic distribution of the metabolite in axenic strains of the Pasteur Culture Collection of Cyanobacteria. By integrating genome mining with untargeted metabolomics using liquid chromatography with mass spectrometry, we linked aeruginoguanidine (AGD) to a nonribosomal peptide synthetase gene cluster and coassigned a significantly smaller product to this pathway, microguanidine (MGD), previously only reported from two Microcystis blooms. Further, a new intermediate class of compounds named microguanidine amides was uncovered, thereby further enlarging this compound family. The comparison of structurally divergent AGDs and MGDs reveals an outstanding versatility of this biosynthetic pathway and provides insights into the assembly of the two compound subfamilies. Strikingly, aeruginoguanidines and microguanidines were found to be as widespread as the hepatotoxic microcystins, but the occurrence of both toxin families appeared to be mutually exclusive.
Filamentous cyanobacteria belong to the most prolific producers of structurally unique and biologically active natural products, yet the majority of biosynthetic gene clusters predicted for these multicellular collectives are currently orphan. Here, we present a systems analysis of secondary metabolite gene expression in the model strain Nostoc punctiforme PCC73102 using RNA-seq and fluorescence reporter analysis. Our data demonstrate that the majority of the cryptic gene clusters are not silent but are expressed with regular or sporadic pattern. Cultivation of N. punctiforme using high-density fermentation overrules the spatial control and leads to a pronounced upregulation of more than 50% of biosynthetic gene clusters. Our data suggest that a combination of autocrine factors, a high CO2 level, and high light account for the upregulation of individual pathways. Our overarching study not only sheds light on the strategies of filamentous cyanobacteria to share the enormous metabolic burden connected with the production of specialized molecules but provides an avenue for the genome-based discovery of natural products in multicellular cyanobacteria as exemplified by the discovery of highly unusual variants of the tricyclic peptide microviridin.
The sequencing of the human genome in the early 2000s led to an increased interest in cheap and fast sequencing technologies. This interest culminated in the advent of next generation sequencing (NGS). A number of different NGS platforms have arisen since then all promising to do the same thing, i.e. produce large amounts of genetic information for relatively low costs compared to more traditional methods such as Sanger sequencing. The capabilities of NGS meant that researchers were no longer bound to species for which a lot of previous work had already been done (e.g. model organisms and humans) enabling a shift in research towards more novel and diverse species of interest. This capability has greatly benefitted many fields within the biological sciences, one of which being the field of evolutionary biology. Researchers have begun to move away from the study of laboratory model organisms to wild, natural populations and species which has greatly expanded our knowledge of evolution. NGS boasts a number of benefits over more traditional sequencing approaches. The main benefit comes from the capability to generate information for drastically more loci for a fraction of the cost. This is hugely beneficial to the study of wild animals as, even when large numbers of individuals are unobtainable, the amount of data produced still allows for accurate, reliable population and species level results from a small selection of individuals.
The use of NGS to study species for which little to no previous research has been carried out on and the production of novel evolutionary information and reference datasets for the greater scientific community were the focuses of this thesis. Two studies in this thesis focused on producing novel mitochondrial genomes from shotgun sequencing data through iterative mapping, bypassing the need for a close relative to serve as a reference sequence. These mitochondrial genomes were then used to infer species level relationships through phylogenetic analyses. The first of these studies involved reconstructing a complete mitochondrial genome of the bat eared fox (Otocyon megalotis). Phylogenetic analyses of the mitochondrial genome confidently placed the bat eared fox as sister to the clade consisting of the raccoon dog and true foxes within the canidae family. The next study also involved reconstructing a mitochondrial genome but in this case from the extinct Macrauchenia of South America. As this study utilised ancient DNA, it involved a lot of parameter testing, quality controls and strict thresholds to obtain a near complete mitochondrial genome devoid of contamination known to plague ancient DNA studies. Phylogenetic analyses confidently placed Macrauchenia as sister to all living representatives of Perissodactyla with a divergence time of ~66 million years ago. The third and final study of this thesis involved de novo assemblies of both nuclear and mitochondrial genomes from brown and striped hyena and focussed on demographic, genetic diversity and population genomic analyses within the brown hyena. Previous studies of the brown hyena hinted at very low levels of genomic diversity and, perhaps due to this, were unable to find any notable population structure across its range. By incorporating a large number of genetic loci, in the form of complete nuclear genomes, population structure within the brown hyena was uncovered. On top of this, genomic diversity levels were compared to a number of other species. Results showed the brown hyena to have the lowest genomic diversity out of all species included in the study which was perhaps caused by a continuous and ongoing decline in effective population size that started about one million years ago and dramatically accelerated towards the end of the Pleistocene.
The studies within this thesis show the power NGS sequencing has and its utility within evolutionary biology. The most notable capabilities outlined in this thesis involve the study of species for which no reference data is available and in the production of large amounts of data, providing evolutionary answers at the species and population level that data produced using more traditional techniques simply could not.
Background: Inferring regulatory interactions between genes from transcriptomics time-resolved data, yielding reverse engineered gene regulatory networks, is of paramount importance to systems biology and bioinformatics studies. Accurate methods to address this problem can ultimately provide a deeper insight into the complexity, behavior, and functions of the underlying biological systems. However, the large number of interacting genes coupled with short and often noisy time-resolved read-outs of the system renders the reverse engineering a challenging task. Therefore, the development and assessment of methods which are computationally efficient, robust against noise, applicable to short time series data, and preferably capable of reconstructing the directionality of the regulatory interactions remains a pressing research problem with valuable applications.
Results: Here we perform the largest systematic analysis of a set of similarity measures and scoring schemes within the scope of the relevance network approach which are commonly used for gene regulatory network reconstruction from time series data. In addition, we define and analyze several novel measures and schemes which are particularly suitable for short transcriptomics time series. We also compare the considered 21 measures and 6 scoring schemes according to their ability to correctly reconstruct such networks from short time series data by calculating summary statistics based on the corresponding specificity and sensitivity. Our results demonstrate that rank and symbol based measures have the highest performance in inferring regulatory interactions. In addition, the proposed scoring scheme by asymmetric weighting has shown to be valuable in reducing the number of false positive interactions. On the other hand, Granger causality as well as information-theoretic measures, frequently used in inference of regulatory networks, show low performance on the short time series analyzed in this study.
Conclusions: Our study is intended to serve as a guide for choosing a particular combination of similarity measures and scoring schemes suitable for reconstruction of gene regulatory networks from short time series data. We show that further improvement of algorithms for reverse engineering can be obtained if one considers measures that are rooted in the study of symbolic dynamics or ranks, in contrast to the application of common similarity measures which do not consider the temporal character of the employed data. Moreover, we establish that the asymmetric weighting scoring scheme together with symbol based measures (for low noise level) and rank based measures (for high noise level) are the most suitable choices.
Maize is the cereal crop with the highest production worldwide, and its oil is a key energy resource. Improving the quantity and quality of maize oil requires a better understanding of lipid metabolism. To predict the function of maize genes involved in lipid biosynthesis, we assembled transcriptomic and lipidomic data sets from leaves of B73 and the high-oil line By804 in two distinct time-series experiments. The integrative analysis based on high-dimensional regularized regression yielded lipid-transcript associations indirectly validated by Gene Ontology and promoter motif enrichment analyses. The co-localization of lipid-transcript associations using the genetic mapping of lipid traits in leaves and seedlings of a B73 x By804 recombinant inbred line population uncovered 323 genes involved in the metabolism of phospholipids, galactolipids, sulfolipids and glycerolipids. The resulting association network further supported the involvement of 50 gene candidates in modulating levels of representatives from multiple acyl-lipid classes. Therefore, the proposed approach provides high-confidence candidates for experimental testing in maize and model plant species.
Polyhydroxyalkanoates (PHAs) have attracted attention as degradable (co)polyesters which can be produced by microorganisms with variations in the side chain. This structural variation influences not only the thermomechanical properties of the material but also its degradation behavior. Here, we used Langmuir monolayers at the air-water (A-W) interface as suitable models for evaluating the abiotic degradation of two PHAs with different side-chain lengths and crystallinity. By controlling the polymer state (semi crystalline, amorphous), the packing density, the pH, and the degradation mechanism, we could draw several significant conclusions. (i) The maximum degree of crystallinity for a PHA film to be efficiently degraded up to pH = 12.3 is 40%. (ii) PHA made of repeating units with shorter side-chain length are more easily hydrolyzed under alkaline conditions. The efficiency of alkaline hydrolysis decreased by about 65% when the polymer was 40% crystalline. (iii) In PHA films with a relatively high initial crystallinity, abiotic degradation initiated a chemicrystallization phenomenon, detected as an increase in the storage modulus (E'). This could translate into an increase in brittleness and reduction in the material degradability. Finally, we demonstrate the stability of the measurement system for long-term experiments, which allows degradation conditions for polymers that could closely simulate real-time degradation.
Leaf senescence is an active process required for plant survival, and it is flexibly controlled, allowing plant adaptation to environmental conditions. Although senescence is largely an age-dependent process, it can be triggered by environmental signals and stresses. Leaf senescence coordinates the breakdown and turnover of many cellular components, allowing a massive remobilization and recycling of nutrients from senescing tissues to other organs (e.g., young leaves, roots, and seeds), thus enhancing the fitness of the plant. Such metabolic coordination requires a tight regulation of gene expression. One important mechanism for the regulation of gene expression is at the transcriptional level via transcription factors (TFs). The NAC TF family (NAM, ATAF, CUC) includes various members that show elevated expression during senescence, including ORE1 (ANAC092/AtNAC2) among others. ORE1 was first reported in a screen for mutants with delayed senescence (oresara1, 2, 3, and 11). It was named after the Korean word “oresara,” meaning “long-living,” and abbreviated to ORE1, 2, 3, and 11, respectively. Although the pivotal role of ORE1 in controlling leaf senescence has recently been demonstrated, the underlying molecular mechanisms and the pathways it regulates are still poorly understood. To unravel the signaling cascade through which ORE1 exerts its function, we analyzed particular features of regulatory pathways up-stream and down-stream of ORE1. We identified characteristic spatial and temporal expression patterns of ORE1 that are conserved in Arabidopsis thaliana and Nicotiana tabacum and that link ORE1 expression to senescence as well as to salt stress. We proved that ORE1 positively regulates natural and dark-induced senescence. Molecular characterization of the ORE1 promoter in silico and experimentally suggested a role of the 5’UTR in mediating ORE1 expression. ORE1 is a putative substrate of a calcium-dependent protein kinase named CKOR (unpublished data). Promising data revealed a positive regulation of putative ORE1 targets by CKOR, suggesting the phosphorylation of ORE1 as a requirement for its regulation. Additionally, as part of the ORE1 up-stream regulatory pathway, we identified the NAC TF ATAF1 which was able to transactivate the ORE1 promoter in vivo. Expression studies using chemically inducible ORE1 overexpression lines and transactivation assays employing leaf mesophyll cell protoplasts provided information on target genes whose expression was rapidly induced upon ORE1 induction. First, a set of target genes was established and referred to as early responding in the ORE1 regulatory network. The consensus binding site (BS) of ORE1 was characterized. Analysis of some putative targets revealed the presence of ORE1 BSs in their promoters and the in vitro and in vivo binding of ORE1 to their promoters. Among these putative target genes, BIFUNCTIONAL NUCLEASE I (BFN1) and VND-Interacting2 (VNI2) were further characterized. The expression of BFN1 was found to be dependent on the presence of ORE1. Our results provide convincing data which support a role for BFN1 as a direct target of ORE1. Characterization of VNI2 in age-dependent and stress-induced senescence revealed ORE1 as a key up-stream regulator since it can bind and activate VNI2 expression in vivo and in vitro. Furthermore, VNI2 was able to promote or delay senescence depending on the presence of an activation domain located in its C-terminal region. The plasticity of this gene might include alternative splicing (AS) to regulate its function in different organs and at different developmental stages, particularly during senescence. A model is proposed on the molecular mechanism governing the dual role of VNI2 during senescence.
The Annamites mountain range of Southeast Asia which runs along the border of Viet Nam and Laos is an important biodiversity hotspot with high levels of endemism. However, that biodiversity is threatened by unsustainable hunting, and many protected areas across the region have been emptied of their wildlife. To better protect the unique species in the Annamites, it is crucial to have a better understanding of their ecology and distribution. Additionally, basic genetic information is needed to provide conservation stakeholders with essential information to facilitate conservation breeding and counteract the illegal wildlife trade. To date, this baseline information is lacking for many Annamites species.
This thesis aims to assess the effectiveness of using non-invasive collection methods, i.e. camera-trap surveys and leech-derived wildlife host DNA, in order to improve and enhance our understanding of ecology, distribution, and genetic diversity of the Annamites terrestrial mammals.
In chapter 1, we analysed data from a systematic landscape camera-trap survey using single-species occupancy models to assess the ecology and distribution of two little-known Annamite endemics, the Annamite dark muntjac (Muntiacus rooseveltorum / truongsonensis) and Annamite striped rabbit (Nesolagus timminsi), in multiple protected areas across the Annamites. This chapter provided the first in-depth information on their ecology, as well as distribution patterns at large spatial scales. Most notably, we found that the Annamite dark muntjac was predominantly found at higher elevations, while responses to elevation varied among study areas for the Annamite striped rabbit. We estimated occupancy probabilities for both endemics by using their responses to environmental and anthropogenic influences and used this information to make recommendations for targeted conservation actions. We discuss how the approach we used for these two Annamites endemics can be expanded for other little-known and threatened species in other tropical regions.
As is the case with ecology and distribution, very little is known about the genetic diversity of the Annamite striped rabbit and other mammals of the Annamites. This poor understanding is mainly attributed to the lack of a comprehensive DNA sample collection that covers the species’ entire distribution range, which is believed to be a consequence of the low density of mammals or the remoteness of species’ habitat. In order to overcome the difficulties when trying to collect DNA samples from elusive mammals, we applied invertebrate-derived DNA (iDNA) sampling via hematophagous leeches to indirectly obtain genetic materials of their terrestrial host mammals.
In chapter 2, leech-derived DNA was used to study the genetic diversity of the Annamite striped rabbit population. By analysing the DNA extracted from leech samples collected at multiple study areas of the central Annamites, we found a genetic variation with five haplotypes among nine obtained sequences. Despite this diversity, we found no clear phylogeographic pattern among the lagomorph’s populations in central Annamites. The findings have direct conservation implications for the species, as local stakeholders are currently establishing a conservation rescue and breeding facility for Annamite endemic species. Thus our results suggested that Annamite striped rabbits from multiple protected areas in central Annamites can be used as founders for the breeding program.
In chapter 3, the genetic material of six mammals, which are frequently found in Indochina's illegal wildlife trade, was extracted from leeches collected at six study sites across the Anamites. Species-specific genetic markers were used to obtain DNA fragments that were analysed together with Genbank reference sequences from other parts of the species’ distribution range. Our results showed that invertebrate-derived DNA can be used to fill the sampling gaps and provide genetic reference data that is needed for conservation breeding programmes or to counteract the illegal wildlife trade.
Overal, this dissertation provides the first insights in the ecology, distribution, and genetics of rare and threatened species of the Annamites by utilising camera traps and leech-derived DNA as two non-invasive collection methods. This information is essential for improving conservation efforts of local stakeholders and managers, especially for the Annamite endemics. Results in this dissertation also show the effectiveness of both non-invasive methods for studying terrestrial mammals at a landscape level. By expanding the application of these methods to other protected areas across the Annamites, we will further our understanding of ecology, distribution, and genetics of Annamite endemics. With such landscape-scale surveys, we are able to provide stakeholders with an overview of the current status of wildlife in the Annamites which supports efforts to protect these secretive species from illegal hunting and thus their extinction.
Untersuchung des Recyclings Kaede-fusionierter Corticotropin-Releasing-Factor Rezeptoren Typ 1
(2009)
Aktivierte G-Protein-gekoppelte Rezeptoren (GPCR) werden schnell desensitisiert, internalisiert und anschließend entweder lysosomal degradiert oder zur Plasmamembran (PM) recycelt. Zur Resensitisierung der Zellen tragen neben recycelten auch neusynthetisierte Rezeptoren bei. Die Überlagerung beider Prozesse erschwert die Untersuchung des Rezeptorrecyclings. In dieser Arbeit sollte mit Hilfe des photokonvertierbaren Fluoreszenzproteins Kaede eine Technik entwickelt werden, mit der es möglich ist Recycling- von Neusyntheseprozessen zu trennen und das Recycling von GPCR mikroskopisch in Echtzeit zu beobachten. Als Modellproteine wurden der Vasopressin-1a-Rezeptor V1aR (recycelnder Rezeptor), der Vasopressin-2-Rezeptor V2R (degradierter Rezeptor) und der Corticotropin-Releasing Factor-Rezeptor Typ 1 (CRF1R) verwendet, wobei bei Letzterem untersucht werden sollte, ob er nach Stimulation zur PM zurücktransportiert wird. Da Kaede als fluoreszierendes Protein mit den GPCR fusioniert wird, wurde zunächst überprüft, ob es die Eigenschaften der Rezeptoren verändert und generell für Transportstudien geeignet ist. Eventuell könnte die bereits publizierte Tetramerisierung von Kaede seine Anwendung verhindern oder erschweren. Mittels Fluoreszenz-Korrelationsspektroskopie konnte gezeigt werden, dass Kaede nicht tetramerisiert, wenn es an ein Membranprotein fusioniert ist. Außerdem konnte in in vitro- und Zellkulturexperimenten belegt werden, dass die native und die photokonvertierte Form von Kaede gleichermaßen stabil sind. Darüber hinaus zeigten Kaede-fusionierte GPCR sowohl in Kolokalisationsstudien als auch in Agonistbindungs- und Rezeptoraktivierungsexperimenten die gleichen Eigenschaften wie CFP- bzw. die unfusionierte Rezeptoren. Lediglich die Expression der Kaede-fusionierten Rezeptoren war geringer. Parallel wurde anhand der bereits publizierten Kaede-Struktur versucht, die Tetramerisierung des Proteins durch den Austausch interagierender Aminosäuren zu unterbinden. Die eingeführten Mutationen bewirkten aber eine Fehlfaltung des Proteins und damit den Verlust der Fluoreszenz. Da zuvor gezeigt werden konnte, dass Kaede-fusionierte Membranproteine nicht tetramerisieren und nicht die Eigenschaften der fusionierten Proteine verändern, war monomerisiertes Kaede zur Untersuchung des Rezeptorrecyclings nicht notwendig. Im zweiten Teil der Arbeit wurde mit Hilfe von Kaede-Fusionsproteinen und mikroskopischer Testsysteme das noch unbekannte Recyclingverhalten des CRF1R untersucht. Hierfür wurden die Kaede-fusionierten Rezeptoren in eukaryotischen Zellen exprimiert und mit Agonisten internalisiert. Die internalisierten Rezeptoren wurden in Endosomen selektiv mit UV-Strahlung photokonvertiert. Anschließend wurde der Transport der photokonvertierten Form verfolgt. Sowohl beim CRF1R als auch beim V1aR wurden Signale in der PM detektiert, beim V2R hingegen nicht. Dies zeigt, dass es sich beim CRF1R um einen recycelnden Rezeptor handelt. Die als Kontrolle eingesetzten Rezeptoren verhielten sich in diesem Experiment wie erwartet: Der V1aR wurde zur PM zurücktransportiert, der V2R nicht. Diese Ergebnisse konnten mit Hilfe biochemischer und durchflusscytometrischer Experimente bestätigt werden. Die Internalisierung des CRF1R verläuft Clathrin-vermittelt in Anwesenheit von β-Arrestin. Je nach Stabilität der β Arrestin-Interaktion unterscheidet man zwei Klassen von Rezeptoren: Klasse A-Rezeptoren interagieren transient mit β Arrestin und können recyceln. Im Gegensatz dazu gehen Klasse B-Rezeptoren eine stabile Interaktion mit β Arrestin ein und werden nach Internalisierung degradiert. In mikroskopischen Untersuchungen konnte für die aktivierten CRF1R und V1aR eine Rekrutierung von β Arrestin zur PM und eine transiente Interaktion mit β Arrestin gezeigt werden (Klasse A-Rezeptoren). Für den V2R wurde dagegen eine stabile Interaktion mit β Arrestin beobachtet (Klasse B-Rezeptor). Diese Daten stützen die Ergebnisse des Kaede-basierten Recyclingversuchs und zeigen, dass der CRF1R ein recycelnder Rezeptor ist. Ferner wurde untersucht, ob der CRF1R zu den schnell oder langsam recycelnden Rezeptoren zählt. Schnell recycelnde Rezeptoren werden direkt aus frühen Endosomen, langsam recycelnde hingegen über das Trans-Golgi-Netzwerk (TGN) bzw. über Recycling-Endosomen zur PM transportiert. Als Marker für das TGN oder die Recycling-Endosomen wurde Rab11 verwendet. In Kolokalisationsstudien konnte gezeigt werden, dass der CRF1R den langsam recycelnden Rezeptoren zugeordnet werden kann. Zusammenfassend konnte in dieser Arbeit belegt werden, dass Kaede als Fusionspartner für Membranproteine genutzt werden kann um deren Transport in Echtzeit zu studieren. Damit wurde erstmals eine mikroskopische Methode etabliert, die es erlaubt recycelnde von neusynthetisierten Rezeptoren zu unterscheiden. Mit Hilfe dieser Methode war es möglich zu zeigen, dass der CRF1R ein recycelnder Rezeptor ist.
"Untersuchung kardioprotektiver Wirkungen des Olivenöles und seiner phenolischen Komponenten in einer Gruppe gesunder deutscher Männer" EINLEITUNG: Epidemiologische Daten belegen, dass die mediterrane Ernährung mit einer niedrigen Inzidenz an mit oxidativen Stress assoziierten kardiovaskulären Erkrankungen einhergeht. Dabei wird vor allem dem Olivenöl, als Hauptfettlieferant in der mediterranen Ernährung, eine kardioprotektive Wirkung zugesprochen. Olivenöl zeichnet sich neben dem hohen Gehalt an einfach ungesättigten Fettsäuren (MUFA) durch ein reichhaltiges Spektrum an phenolischen Verbindungen aus, deren antioxidative Wirkung bereits zahlreichen in in vitro Studien beschrieben wurde. Demnach könnte der Verzehr von phenolreichem Olivenöl auch in vivo vor oxidativen Schädigungen schützen und somit das Risiko für kardiovaskuläre Erkrankungen senken. ZIELSTELLUNG: Untersuchung der kardioprotektiven Wirkung von Olivenöl und seiner phenolischen Komponenten in einer Gruppe gesunder deutscher Männer. METHODE: Dazu wurde eine randomisierte cross-over doppelt-verblindete Interventionsstudie an 70 gesunden Männern zwischen 20 - 60 Jahren im Raum Berlin-Brandenburg durchgeführt. In jeweils drei dreiwöchigen Interventionsphasen konsumierten die Probanden täglich 25 ml natives (phenolreich), gemischtes (mittlerer Phenolgehalt) und raffiniertes (annähernd phenolfrei) Olivenöl, was sich ausschließlich im Gehalt an phenolischen Verbindungen unterschied. Das Olivenöl sollte dabei die gewöhnlich verzehrten Fette ersetzen. Die Interventionsphasen waren durch zweiwöchige Wash out-Phasen unterbrochen. Die Erhebung der Blutlipide, Biomarker der Lipidperoxidation und endogene Antioxidantien erfolgte zu Studienbeginn sowie zu Beginn und Ende jeder Verzehrsperiode.ERGEBNISSE: Bei den Blutlipiden sowie den Biomarkern der Lipidperoxidation und den endogenen Antioxidantien konnte keine signifikante Veränderung in Abhängigkeit vom Phenolgehalt der applizierten Olivenöle nachgewiesen werden. Einzig die Glutathion-Reduktase-Aktivität stieg mit zunehmendem Gehalt an phenolischen Verbindungen (pTrend = 0,041). Unabhängig von der Konzentration der Phenole im Olivenöl wurde bei den Probanden durch den Olivenölverzehr eine Senkung von Gesamtcholesterol (p = 0,007) und Triglyzeride (p = 0,013) im Serum erzielt. Diese Wirkung geht einher mit einem gestiegenen MUFA-Anteil in der Ernährung aufgrund des Olivenölkonsums (p < 0,001). SCHLUSSFOLGERUNG: Die Hypothese, dass die Phenole im Olivenöl aufgrund ihrer in in vitro und Tierstudien beschriebenen antioxidativen Wirkung dem Olivenöl neben dem einzigartigen Fettsäureprofil eine zusätzliche kardioprotektive Wirkung bescheren, konnte in der vorliegenden Studie nicht gezeigt werden. Dennoch konnte durch den Olivenölverzehr und der damit einhergehenden Erhöhung des MUFA-Anteils in der Ernährung eine vorteilhafte Beeinflussung der Blutlipide erzielt werden. Obgleich Olivenöl nicht das vorwiegend verzehrte Fett in Deutschland darstellt, zeigten die befragten Probanden eine hohe Akzeptanz. Folglich könnte die Integration von Olivenöl in die habituelle Ernährung einen Beitrag zur Senkung des kardiovaskulären Erkrankungsrisikos leisten.
Untersuchungen PEG-basierter thermo-responsiver Polymeroberflächen zur Steuerung der Zelladhäsion
(2010)
Moderne Methoden für die Einzelzellanalyse werden dank der fortschreitenden Weiterentwicklung immer sensitiver. Dabei steigen jedoch auch die Anforderungen an das Probenmaterial. Viele Aufbereitungsprotokolle adhärenter Zellen beinhalten eine enzymatische Spaltung der Oberflächenproteine, um die Ablösung vom Zellkultursubstrat zu ermöglichen. Verschiedene Methoden, wie die Patch-Clamp-Technik oder eine auf der Markierung extrazellulärer Domänen von Membranproteinen basierende Durchflusszytometrie können dann nur noch eingeschränkt eingesetzt werden. Daher ist die Etablierung neuer Zellablösemethoden dringend notwendig. In der vorliegenden Arbeit werden erstmals PEG-basierte thermo-responsive Oberflächen erfolgreich für die Zellkultur eingesetzt. Dabei wird das zerstörungsfreie Ablösen verschiedener Zelllinien von den Oberflächen durch Temperatursenkung realisiert. Die Funktionalität der Oberflächen wird durch Variation der Polymerstruktur, sowie der Konzentration der Beschichtungslösung, durch Beschichtung der Oberflächen mit einem zelladhäsionsfördernden Protein (Fibronektin) und durch Adsorption zelladhäsionsvermittelnder Peptide (RGD) optimiert. Um den Zellablösungsprozess detaillierter zu untersuchen, wird hier zum ersten Mal der direkte Zellkontakt mit thermo-responsiven Oberflächen mittels oberflächensensitiver Mikroskopie (TIRAF) sichtbar gemacht. Mit dieser Technik sind die exakte Quantifizierung und die Analyse der Reduktion der Zelladhäsionsfläche während des Abkühlens möglich. Hierbei werden in Abhängigkeit von der Zelllinie Unterschiede im Zellverhalten während des Ablösens festgestellt: Zellen, wie eine Brustkrebszelllinie und eine Ovarzelllinie, die bekanntermaßen stärker mit ihrer Umgebung in Kontakt treten, vergrößern im Verlauf des Beobachtungszeitraumes den Abstand zwischen Zellmembran und Oberfläche, reduzieren jedoch ihre Zell-Substratkontaktfläche kaum. Mausfibroblasten hingegen verkleinern drastisch die Zelladhäsionsfläche. Der Ablösungsprozess wird vermutlich aktiv von den Zellen gesteuert. Diese Annahme wird durch zwei Beobachtungen gestützt: Erstens verläuft die Reduktion der Zelladhäsionsfläche bei Einschränkung des Zellmetabolismus durch eine Temperatursenkung auf 4 °C verzögert. Zweitens hinterlassen die Zellen Spuren, die nach dem Ablösen der Zellen auf den Oberflächen zurückbleiben. Mittels Kombination von TIRAF- und TIRF-Mikroskopie werden die Zelladhäsionsfläche und die Aktinstruktur gleichzeitig beobachtet. Die Verknüpfung beider Methoden stellt eine neue Möglichkeit dar, intrazelluläre Prozesse mit der Zellablösung von thermo-responsiven Oberflächen zu korrelieren.
Auf dem Weg der genetischen Information stellt die Translation der RNA in eine Aminosäuresequenz den letzten Schritt dar. In Chloroplasten, den grünen Organellen der Pflanzenzellen, findet ein Großteil der Regulation der Genexpression auf Ebene der Initiation dieses Schrittes statt. Eine Vielzahl von Eigenschaften der RNA und von Faktoren, die an die RNA binden, entfalten einen Einfluss auf diesen Schritt. Bisher unvollständig aufgeklärt ist die Rolle einer konservierten Nukleotidsequenz in der untranslatierten Region der RNA -- der Shine-Dalgarno-Sequenz. Diese stellt in Bakterien, wie z.B. E. coli als Ribosomenbindestelle sicher, dass Ribosomen den Anfang der zu translatierenden Sequenz zuverlässig erkennen. Im Rahmen dieser Arbeit wurden diverse DNA-Konstrukte in Plastiden von Tabak eingebracht. Hierzu zählten Konstrukte, die sowohl eine erhöhte Anzahl von Ribosomenbindestellen enthielten als auch vermehrte Startpunkte der Translation. Zusätzlich wurden Konstrukte hergestellt, die die Situation von mehreren zu translatierenden Regionen in der RNA nachstellten. Es konnte festgestellt werden, dass plastidäre Ribosomen die strangaufwärts gelegenen Translationsstartpunkte bevorzugen -- im Gegensatz zu E. coli, wo alle Startpunkte gleichmäßig genutzt wurden. Hierdurch zeigten die prokaryotischen Ribosomen aus Chloroplasten, die sich aus bakteriellen Systemen ableiten, Eigenschaften von eukaryotischen Ribosomen. Ein zweites Teilprojekt dieser Arbeit beschäftigte sich mit der Inkompatibilität von Chloroplasten mit dem Kerngenom. In Kreuzungen von Arten der Gattung Pelargonium fielen Kombinationen auf, bei denen die Tochterpflanzen bleiche Blattbereiche bis hin zu vollständig weißen Pflanzen zeigten. Dieses Phänomen wird als Bastardbleichheit bezeichnet. In der Gattung Pelargonium werden Chloroplasten von beiden Elternteilen an die Tochterpflanzen vererbt. Da das Phänomen der Bastardbleichheit nur in einem der Plastiden vorkommt, nicht jedoch im anderen in der gleichen Pflanze, muss von einem Effekt ausgegangen werden, der von Plastiden ausgeht. Die Interaktionen zwischen Zellkern und Chloroplasten sind offensichtlich stark gestört. Zur detaillierten Untersuchung dieses Effekts wurde die Nukleotidsequenz von drei Chloroplastengenomen aufgeklärt. Es konnte eine Reihe von Sequenzunterschieden der Genome ermittelt werden. Aus diesen wurde eine Reihe von Unterschieden beobachtet, die einen solchen Effekt zur Folge haben können. Aus diesen Unterschieden wurde eine Reihe von potentiellen Kandidatengenen zusammengestellt, die in weiteren Arbeiten auf ihre Rolle in der Entstehung der Bastardbleichheit untersucht werden.
Mit der vorliegenden Arbeit sollten mit Hilfe elektronenmikroskopischer Methoden verschiedene Liposomen-DNA-Komplexe zum Gentransfer charakterisiert sowie die Aufnahme und Verteilung in der Zellkultur untersucht werden. Dabei waren vor allem solche Präparationen von besonderem Interesse, die in unserer Arbeitsgruppe 'Drug Targeting' getestet oder entwickelt und verwendet wurden, wie Sendai-Virus Liposomen (HVJ-Liposomen), Virosomen sowie DAC-Chol und DOCSPER-Liposomen als Vertreter der kationischen Lipide. Im ersten Teil der Arbeit wurden fusogene Liposomen und Virosomen charakterisiert. Bei diesen Untersuchungen wurden folgende Ergebnisse erzielt: ·Sendai-Viren fusionieren mit Liposomen unterschiedlicher Lipidzusammensetzung. ·Die daraus resultierenden HVJ-Liposomen sind mit elektronenmikroskopischen Methoden identifizierbar. ·Die Spikes auf den HVJ-Liposomen besitzen fusogene Eigenschaften. ·HVJ-Liposomen eignen sich auf Grund der geringen Ausbeute sowie der geringen Transfektionseffizienz nicht zum in vitro Gentransfer. ·Virosomen stellen einen weiteren Typ fusogener Gentransfervesikel dar. ·Ihre Größe und fusogenen Eigenschaften sind abhängig von der externen Zugabe einer optimierten Lipidmischung. ·Im Innenraum der Virosomen kann mit Poly-L-Lysin vorkomplexierte DNA verkapselt werden. ·Die fusogenen Eigenschaften der Virosomen wurden mit Hilfe immunelektronenmikroskopischer Techniken und monoklonaler Antikörper gegen Hämagglutinin/Neuraminidase und das Fusionsprotein sowie mit polyklonalen Antiseren gezeigt. ·An Hand goldmarkierter DNA sind Virosomen nach der Transfektion in der Zelle nachweisbar. Da in unserer Arbeitsgruppe bevorzugt kationische Liposomen zum Gentransfer verwendet werden, wurde auch die Struktur der Liposomen untersucht und folgende Ergebnisse dokumentiert: ·Die Struktur und die Größe kationischer Liposomen werden hauptsächlich durch die Lipidzusammensetzung bestimmt. ·Die Bildung von Liposomen-DNA-Komplexen ist mit einer Größenzunahme der Komplexe gekoppelt. ·Die Anzahl gebundener Plasmide steigt mit der Größe der Lipoplexe. ·Gentransferaktive Lipopolyplexe (mit Protaminsulfat komplexierte DNA und DAC-Chol- Liposomen) sind kleiner als Lipoplexe. Ihre Struktur wird von der Zusammensetzung bestimmt. Eine weitere wichtige Frage betrifft den Weg der Gencarrier in der Zelle. Kenntnisse über diese Vorgänge sind vorteilhaft, um die einzelnen Schritte zu verstehen und möglichst gezielt zu verbessern. Bei der Untersuchung der Partikel im Hinblick auf zelluläre Barrieren beim Gentransfer konnten folgende Ergebnisse erzielt werden: ·Die Bindung der Partikel an die Zellmembran und Aufnahme sind abhängig von den eingesetzten Zellen und Komplexen sowie derInkubationszeit. ·Die Aufnahme erfolgt über endozytotische Mechanismen, wobei Lipopolyplexe schneller als Lipoplexe in die Zellen gelangen. Nicht alle gebundenen Komplexe werden aufgenommen. ·Die aufgenommenen Partikel befinden sich in Endosomen und werden ins Innere der Zelle transportiert. ·Freisetzung der DNA und Eintritt in den Zellkern über Kernporen konnte nicht beobachtet werden. ·DNA-haltige Vesikel in Kernnähe deuten auf einen weiteren Mechanismus hin (Vesikeltransfer zum Zellkern).
Even though the structure of the plant cell wall is by and large quite well characterized, its synthesis and regulation remains largely obscure. However, it is accepted that the building blocks of the polysaccharidic part of the plant cell wall are nucleotide sugars. Thus to gain more insight into the cell wall biosynthesis, in the first part of this thesis, plant genes possibly involved in the nucleotide sugar interconversion pathway were identified using a bioinformatics approach and characterized in plants, mainly in Arabidopsis. For the computational identification profile hidden markov models were extracted from the Pfam and TIGR databases. Mainly with these, plant genes were identified facilitating the “hmmer” program. Several gene families were identified and three were further characterized, the UDP-rhamnose synthase (RHM), UDP-glucuronic acid epimerase (GAE) and the myo-inositol oxygenase (MIOX) families. For the three-membered RHM family relative ubiquitous expression was shown using variuos methods. For one of these genes, RHM2, T-DNA lines could be obtained. Moreover, the transcription of the whole family was downregulated facilitating an RNAi approach. In both cases a alteration of cell wall typic polysaccharides and developmental changes could be shown. In the case of the rhm2 mutant these were restricted to the seed or the seed mucilage, whereas the RNAi plants showed profound changes in the whole plant. In the case of the six-membered GAE family, the gene expressed to the highest level (GAE6) was cloned, expressed heterologously and its function was characterized. Thus, it could be shown that GAE6 encodes for an enzyme responsible for the conversion of UDP-glucuronic acid to UDP-galacturonic acid. However, a change in transcript level of variuos GAE family members achieved by T-DNA insertions (gae2, gae5, gae6), overexpression (GAE6) or an RNAi approach, targeting the whole family, did not reveal any robust changes in the cell wall. Contrary to the other two families the MIOX gene family had to be identified using a BLAST based approach due to the lack of enough suitable candidate genes for building a hidden markov model. An initial bioinformatic characterization was performed which will lead to further insights into this pathway. In total it was possible to identify the two gene families which are involved in the synthesis of the two pectin backbone sugars galacturonic acid and rhamnose. Moreover with the identification of the MIOX genes a genefamily, important for the supply of nucleotide sugar precursors was identified. In a second part of this thesis publicly available microarray datasets were analyzed with respect to co-responsive behavior of transcripts on a global basis using nearly 10,000 genes. The data has been made available to the community in form of a database providing additional statistical and visualization tools (http://csbdb.mpimp-golm.mpg.de). Using the framework of the database to identify nucleotide sugar converting genes indicated that co-response might be used for identification of novel genes involved in cell wall synthesis based on already known genes.
Arachidonsäurelipoxygenasen (ALOX-Isoformen) sind Lipid-peroxidierenden Enzyme, die bei der Zelldifferenzierung und bei der Pathogenese verschiedener Erkrankungen bedeutsam sind. Im menschlichen Genom gibt es sechs funktionelle ALOX-Gene, die als Einzelkopiegene vorliegen. Für jedes humane ALOX-Gen gibt es ein orthologes Mausgen. Obwohl sich die sechs humanen ALOX-Isoformen strukturell sehr ähnlich sind, unterscheiden sich ihre funktionellen Eigenschaften deutlich voneinander. In der vorliegenden Arbeit wurden vier unterschiedliche Fragestellungen zum Vorkommen, zur biologischen Rolle und zur Evolutionsabhängigkeit der enzymatischen Eigenschaften von Säugetier-ALOX-Isoformen untersucht:
1) Spitzhörnchen (Tupaiidae) sind evolutionär näher mit dem Menschen verwandt als Nagetiere und wurden deshalb als Alternativmodelle für die Untersuchung menschlicher Erkrankungen vorgeschlagen. In dieser Arbeit wurde erstmals der Arachidonsäurestoffwechsel von Spitzhörnchen untersucht. Dabei wurde festgestellt, dass im Genom von Tupaia belangeri vier unterschiedliche ALOX15-Gene vorkommen und die Enzyme sich hinsichtlich ihrer katalytischen Eigenschaften ähneln. Diese genomische Vielfalt, die weder beim Menschen noch bei Mäusen vorhanden ist, erschwert die funktionellen Untersuchungen zur biologischen Rolle des ALOX15-Weges. Damit scheint Tupaia belangeri kein geeigneteres Tiermodel für die Untersuchung des ALOX15-Weges des Menschen zu sein.
2) Entsprechend der Evolutionshypothese können Säugetier-ALOX15-Orthologe in Arachidonsäure-12-lipoxygenierende- und Arachidonsäure-15-lipoxygenierende Enzyme eingeteilt werden. Dabei exprimieren Säugetierspezies, die einen höheren Evolutionsgrad als Gibbons aufweisen, Arachidonsäure-15-lipoxygenierende ALOX15-Orthologe, während evolutionär weniger weit entwickelte Säugetiere Arachidonsäure-12 lipoxygenierende Enzyme besitzen. In dieser Arbeit wurden elf neue ALOX15-Orthologe als rekombinante Proteine exprimiert und funktionell charakterisiert. Die erhaltenen Ergebnisse fügen sich widerspruchsfrei in die Evolutionshypothese ein und verbreitern deren experimentelle Basis. Die experimentellen Daten bestätigen auch das Triadenkonzept.
3) Da humane und murine ALOX15B-Orthologe unterschiedliche funktionelle Eigenschaften aufweisen, können Ergebnisse aus murinen Krankheitsmodellen zur biologischen Rolle der ALOX15B nicht direkt auf den Menschen übertragen werden. Um die ALOX15B-Orthologen von Maus und Mensch funktionell einander anzugleichen, wurden im Rahmen der vorliegenden Arbeit Knock-in Mäuse durch die In vivo Mutagenese mittels CRISPR/Cas9-Technik hergestellt. Diese exprimieren eine humanisierte Mutante (Doppelmutation von Tyrosin603Asparaginsäure+Histidin604Valin) der murinen Alox15b. Diese Mäuse waren lebens- und fortpflanzungsfähig, zeigten aber geschlechtsspezifische Unterschiede zu ausgekreuzten Wildtyp-Kontrolltieren im Rahmen ihre Individualentwicklung.
4) In vorhergehenden Untersuchungen zur Rolle der ALOX15B in Rahmen der Entzündungsreaktion wurde eine antiinflammatorische Wirkung des Enzyms postuliert. In der vorliegenden Arbeit wurde untersucht, ob eine Humanisierung der murinen Alox15b die Entzündungsreaktion in zwei verschiedenen murinen Entzündungsmodellen beeinflusst. Eine Humanisierung der murinen Alox15b führte zu einer verstärkten Ausbildung von Entzündungssymptomen im induzierten Dextran-Natrium-Sulfat-Kolitismodell. Im Gegensatz dazu bewirkte die Humanisierung der Alox15b eine Abschwächung der Entzündungssymptome im Freund‘schen Adjuvans Pfotenödemmodell. Diese Daten deuten darauf hin, dass sich die Rolle der ALOX15B in verschiedenen Entzündungsmodellen unterscheidet.
Alle Organismen sind für ihr Überleben auf Metalle angewiesen. Hierbei gibt es für jedes Metall einen Konzentrationsbereich, der das Optimum zwischen Metallmangel, -bedarf und -toxizität darstellt. Es gilt mittlerweile als erwiesen, dass alle Organismen zur Aufrechterhaltung des Metallgleichgewichts ein komplexes Netzwerk von Proteinen und niedermolekularen Verbindungen entwickelt haben. Die molekularen Komponenten dieses Netzwerks sind nur zu einem Teil bekannt und charakterisiert: In den letzten Jahren wurden einige Proteinfamilien identifiziert, deren Mitglieder Metalle durch Lipidmembranen transportieren. Eine dieser Metalltransporterfamilien ist die Cation Diffusion Facilitator (CDF)-Familie: Alle charakterisierten Mitglieder exportieren Metalle aus dem Zytoplasma – entweder in zelluläre Kompartimente oder aus der Zelle heraus. Von den zwölf Mitgliedern dieser Familie in Arabidopsis thaliana (A. thaliana) – Metall Toleranz Protein (MTP)-1 bis -12 – wurden bisher AtMTP1 und AtMTP3 charakterisiert. In dieser Arbeit wird die Charakterisierung von AtMTP2 beschrieben. Wie die homologen Proteine AtMTP1 und AtMTP3 führt AtMTP2 zu Zn-Toleranz, wenn es heterolog in Zn-sensitiven Hefemutanten exprimiert wird. Mit AtMTP2 transformierte Hefemutanten zeigten darüber hinaus erhöhte Co-Toleranz. Expression von chimären AtMTP2/GFP Fusionsproteinen in Hefe, A.thaliana protoplasten und in stabil transformierten A.thalinana Planzenlinien deutet auf Lokalisation of AtMTP2 in Membranen des Endoplasmatischen Retikulums (ER) hin, wenn GFP an den C-Terminus von MTP2 fusioniert wird. Fusion of GFP an den N-Terminus von AtMTP2 führte zu Lokalisation in der vakuolären Membran, was wahrscheinlichsten auf Fehllokalisierung durch Maskierung eines ER-Retentionsmotivs (XXRR) am N-Terminus von AtMTP2 zurückgeht. Dies legt nahe, dass AtMTP2 die erwähnten Metalle in das Endomembransystem der Zelle transportieren kann. Eine gewebespezifische Lokalisierung wurde mit Pflanzen durchgeführt, die das β-Glucuronidase (GUS)-Reporterprotein bzw. chimäre Fusionsproteine aus EGFP und AtMTP2 unter Kontrolle des nativen pMTP2-Promotors exprimierten. Diese Experimente bestätigten zum einen, dass der pMTP2-Promotor nur unter Zn-Defizienz aktiv ist. GUS-Aktivität wurde unter diesen Bedingungen in zwei Zonen der Wurzelspitze beobachtet: in den isodiametrischen Zellen der meristematischen Zone und in der beginnenden Wurzelhaarzone. Darüber hinaus konnte gezeigt werden, dass die EGFP-Fusionsproteine unter Kontrolle des nativen pMTP2-Promotors nur in epidermalen Zellen exprimiert werden. Für eine homozygote Knockout- Linie, mtp2-S3, konnte bisher kein eindeutiger Phänotyp identifiziert werden. Auf Grundlage der bisher durchgeführten Charakterisierung von AtMTP2 erscheinen zwei Modelle der Funktion von AtMTP2 in der Pflanze möglich: AtMTP2 könnte essentiell für die Versorgung des ER mit Zn unter Zn-Mangelbedingungen sein. Hierfür spricht, dass AtMTP2 in jungen, teilungsaktiven und damit Zn-benötigenden Wurzelzonen exprimiert wird. Die auf die Epidermis beschränkte Lokalisation könnte bei diesem Modell auf die Möglichkeit der zwischenzellulären Zn-Verteilung innerhalb des ER über Desmotubules hindeuten. Alternativ könnte AtMTP2 eine Funktion bei der Detoxifizierung von Zn unter Zn-Schock Bedingungen haben: Es ist bekannt, dass unter Zn- Mangelbedingungen die Expression der zellulären Zn-Aufnahmesysteme hochreguliert wird. Wenn nun die Zn-Verfügbarkeit im Boden z. B durch eine pH-Änderung innerhalb kurzer Zeit stark ansteigt, besteht die Notwendigkeit der Entgiftung von Zn innerhalb der Zelle, bis der starke Einstrom von Zn ins Zytoplasma durch die Deaktivierung der Zn-Aufnahmesysteme und einer geringeren Expression in der Pflanze gedrosselt ist. Ein ähnlicher Mechanismus wurde in der Bäckerhefe S. cerevisae beschrieben, in der darüber hinaus ein Zn-Transporter verstärkt exprimiert wird, der Zn durch Transport in die Vakuole entgiften kann. Es ist durchaus möglich, dass in Arabidopsis AtMTP2 die Zn-Detoxifizierung unter diesen speziellen Bedingungen durch Zn-Transport in das ER oder die Vakuole vermittelt. Zur Identifikation weiterer Komponenten des Metallhomöostasenetzwerks sind verschiedene Ansätze denkbar. In dieser Arbeit wurde in Hefe ein heterologer Screen durchgeführt, um Interaktoren für vier Mitglieder der Arabidopsis-CDF-Familie zu identifizieren. Unter den 11 im Hefesystem bestätigten Kandidaten befindet sich mit AtSPL1 ein AtMTP1-Interaktionskandidat, der möglicherweise eine Rolle bei der Cu-,Zn-Homöostase spielt. Als wahrscheinliche AtMTP3-Interaktionskandidaten wurde die c”-Untereinheit der vakuolären H+-ATPase AtVHA identifiziert sowie mit AtNPSN13 ein Protein, das vermutlich eine Rolle bei Fusionen von Vesikeln mit Zielmembranen spielt. Ein anderer Ansatz zur Identifikation neuer Metallhomöostasegene ist die vergleichende Elementanalyse von natürlichen oder mutagenisierten Pflanzenpopulationen. Voraussetzung für diesen Ansatz ist die schnelle und genaue Analyse des Elementgehalts von Pflanzen. Eine etablierte Methode zur simultanen Bestimmung von bis zu 65 Elementen in einer Probe ist die Inductively Coupled Plasma Optical Emission Spectrometry (ICP OES). Der limitierende Faktor für einen hohen Probendurchsatz ist die Notwendigkeit, Proben für die Analyse zu verflüssigen. Eine alternative Methode der Probenzuführung zum Analysegerät ist die elektrothermale Verdampfung (ETV) der Probe. Zur weitgehend automatisierten Analyse von Pflanzenmaterial mit minimiertem Arbeitsaufwand wurde eine Methode entwickelt, die auf der Kopplung der ETV mit der ICP OES basiert.
Die 11beta-HSD1 reguliert intrazellulär die Cortisolkonzentration durch Regeneration von Cortison z.B. aus dem Blutkreislauf, zu Cortisol. Daher stellt diese ein wichtiges Element in der Glucocorticoid-vermittelten Genregulation dar. Die 11beta-HSD1 wird ubiquitär exprimiert, auf hohem Niveau besonders in Leber, Fettgewebe und glatten Muskelzellen. Insbesondere die Bedeutung der 11beta-HSD1 in Leber und Fettgewebe konnte mehrfach nachgewiesen werden. In der Leber führte eine erhöhte Aktivität aufgrund einer Überexpression in Mäusen zu einer verstärkten Gluconeogeneserate. Des Weiteren konnte gezeigt werden, dass eine erhöhte Expression und erhöhte Enzymaktivität der 11beta-HSD1 im subkutanen und viszeralen Fettgewebe assoziiert ist mit Fettleibigkeit, Insulinresistenz und Dyslipidämie. Über die Regulation ist jedoch noch wenig bekannt. Zur Untersuchung der Promotoraktivität wurde der Promotorbereich von -3034 bis +188, vor und nach dem Translations- und Transkriptionsstart, der 11beta-HSD1 kloniert. 8 Promotorfragmente wurden mittels Dual-Luciferase-Assay in humanen HepG2-Zellen sowie undifferenzierten und differenzierten murinen 3T3-L1-Zellen untersucht. Anschließend wurde mittels nicht-radioaktiven EMSA die Bindung des TATA-Binding Proteins (TBP) sowie von CCAAT/Enhancer-Binding-Proteinen (C/EBP) an ausgewählte Promotorregionen analysiert. Nach der Charakterisierung des Promotors wurden spezifische endogene und exogene Regulatoren untersucht. Fettsäuren modifizieren die Entstehung von Adipositas und Insulinresistenz. Ihre Wirkung wird u.a. PPARgamma-abhängig vermittelt und kann durch das Inkretin (Glucose-dependent insulinotropic Peptide) GIP modifiziert werden. So wurden die Effekte von unterschiedlichen Fettsäuren, vom PPARgamma Agonisten Rosiglitazon sowie dem Inkretin GIP auf die Expression und Enzymaktivität der 11beta-HSD1 untersucht. Dies wurde in-vitro-, tierexperimentell und in humanen in-vivo-Studien realisiert. Zuletzt wurden 2 Single Nucleotide Polymorphismen (SNP) im Promotorbereich der 11beta-HSD1 in der Zellkultur im Hinblick auf potentielle Funktionalität analysiert sowie die Assoziation mit Diabetes mellitus Typ 2 und Körpergewicht in der MeSyBePo-Kohorte bei rund 1.800 Personen untersucht. Die Luciferase-Assays zeigten basal eine zell-spezifische Regulation der 11beta-HSD1, wobei in allen 3 untersuchten Zelltypen die Bindung eines Repressors nachgewiesen werden konnte. Zudem konnte eine mögliche Bindung des TBPs sowie von C/EBP-Proteinen an verschiedene Positionen gezeigt werden. Die Transaktivierungsassays mit den C/EBP-Proteinen -alpha, -beta und -delta zeigten eben-falls eine zellspezifische Regulation des 11beta-HSD1-Promotors. Die Aktivität und Expression der 11beta-HSD1 wurde durch die hier untersuchten endogenen und exogenen Faktoren spezifisch modifiziert, was sowohl in-vitro als auch in-vivo in unterschiedlichen Modellsystemen dargestellt werden konnte. Die Charakterisierung der MeSyBePo-Kohorte ergab keine direkten Assoziationen zwischen Polymorphismus und klinischem Phänotyp, jedoch Tendenzen für eine erhöhtes Körper-gewicht und Typ 2 Diabetes mellitus in Abhängigkeit des Genotyps. Der Promotor der 11beta-HSD1 konnte aufgrund der Daten aus den Luciferaseassays sowie den Daten aus den EMSA-Analysen näher charakterisiert werden. Dieser zeigt eine variable und zell-spezifische Regulation. Ein wichtiger Regulator stellen insbesondere in den HepG2-Zellen die C/EBP-Proteine -alpha, -beta und -delta dar. Aus den in-vivo-Studien ergab sich eine Regulation der 11beta-HSD1 durch endogene, exogene und pharmakologische Substanzen, die durch die Zellkulturversuche bestätigt und näher charakterisiert werden konnten.
Water is essential to life and thus, an essential resource. However, freshwater resources are limited and their maintenance is crucial. Pollution with chemicals and pathogens through urbanization and a growing population impair the quality of freshwater. Furthermore, water can serve as vector for the transmission of pathogens resulting in water-borne illness.
The Interdisciplinary Research Group III – "Water" of the Leibniz alliance project INFECTIONS‘21 investigated water as a hub for pathogens focusing on Clostridioides difficile and avian influenza A viruses that may be shed into the water. Another aim of this study was to characterize the bacterial communities in a wastewater treatment plant (WWTP) of the capital Berlin, Germany to further assess potential health risks associated with wastewater management practices.
Bacterial communities of WWTP inflow and effluent differed significantly. The proportion of fecal/enteric bacteria was relatively low and OTUs related to potential enteric pathogens were largely removed from inflow to effluent. However, a health risk might exist as an increased relative abundance of potential pathogenic Legionella spp. such as L. lytica was observed. Three Clostridioides difficile isolates from wastewater inflow and an urban bathing lake in Berlin (‗Weisser See‘) were obtained and sequenced. The two isolates from the wastewater did not carry toxin genes, whereas the isolate from the lake was positive for the toxin genes. All three isolates were closely related to human strains. This indicates a potential, but rather sporadic health risk. Avian influenza A viruses were detected in 38.8% of sediment samples by PCR, but virus isolation failed. An experiment with inoculated freshwater and sediment samples showed that virus isolation from sediment requires relatively high virus concentrations and worked much better in Madin-Darby Canine Kidney (MDCK) cell cultures than in embryonated chicken eggs, but low titre of influenza contamination in freshwater samples was sufficient to recover virus.
In conclusion, this work revealed potential health risks coming from bacterial groups with pathogenic potential such as Legionella spp. whose relative abundance is higher in the released effluent than in the inflow of the investigated WWTP. It further indicates that water bodies such as wastewater and lake sediments can serve as reservoir and vector, even for non-typical water-borne or water-transmitted pathogens such as C. difficile.
Urbanization promotes specific bacteria in freshwater microbiomes including potential pathogens
(2022)
Freshwater ecosystems are characterized by complex and highly dynamic microbial communities that are strongly structured by their local environment and biota. Accelerating urbanization and growing city populations detrimentally alter freshwater environments. To determine differences in freshwater microbial communities associated with urban-ization, full-length 16S rRNA gene PacBio sequencing was performed in a case study from surface waters and sedi-ments from a wastewater treatment plant, urban and rural lakes in the Berlin-Brandenburg region, Northeast Germany. Water samples exhibited highly habitat specific bacterial communities with multiple genera showing clear urban signatures. We identified potentially harmful bacterial groups associated with environmental parameters specific to urban habitats such as Alistipes, Escherichia/Shigella, Rickettsia and Streptococcus. We demonstrate that urban-ization alters natural microbial communities in lakes and, via simultaneous warming and eutrophication and creates favourable conditions that promote specific bacterial genera including potential pathogens. Our findings are evidence to suggest an increased potential for long-term health risk in urbanized waterbodies, at a time of rapidly expanding global urbanization. The results highlight the urgency for undertaking mitigation measures such as targeted lake restoration projects and sustainable water management efforts.
Der Fettsäurestoffwechsel unterliegt vielfältigen Kontrollmechanismen. So wird der Fettsäureabbau über die Induktion und Aktivität spezifischer Enzyme reguliert. Ein zentraler Regulator ist dabei der nukleäre Rezeptor Peroxisomenproliferator-aktivierter-Rezeptor-α (PPARα). PPARα wird durch freie Fettsäuren in der Zelle aktiviert und fördert über die Induktion von Zielgenen den Fettsäuretransport und -abbau sowie die Gluconeogenese und Ketogenese. Der Anstieg an freien Fettsäuren beim Fasten, aber auch im Diabetes aktiviert PPARα. Unabhängig davon wurde in beiden Stoffwechsellagen auch eine erhöhte Expression des nukleären Rezeptors Constitutiver-Androstan-Rezeptor (CAR) und einiger CAR-Zielgene, vorrangig Enzyme des Fremdstoffmetabolismus wie Cytochrom P450 2B (CYP2B), festgestellt. Bei der Adaption an eine Fastensituation scheinen PPARα- und CAR-Signalwege über einen bisher unbekannten Mechanismus miteinander verschaltet zu sein. In der vorliegenden Arbeit sollte der der Verschaltung zugrunde liegende Mechanismus anhand eines Modelsystems, der PPARα-Agonisten-vermittelten Verstärkung der Phenobarbital (PB)-abhängigen Induktion des CAR-Zielgens CYP2B, in vitro untersucht werden. Zudem sollte die physiologische Relevanz einer durch PPARα-Agonisten vermittelten Modulierung der CYP2B-Aktivität in einer Ganztierstudie in vivo belegt werden. Die verwendeten synthetischen PPARα-Agonisten steigerten in primären Hepatozyten der Ratte signifikant die Phenobarbital (PB)-abhängige mRNA- und Protein-Expression sowie die Aktivität von CYP2B. Ohne vorherige PB-Behandlung induzierten PPARα-Agonisten CYP2B nicht. In Gegenwart von PB war die Steigerung der CYP2B-Aktivität durch PPARα-Agonisten dosisabhängig. In einem Luciferase-Reportergenassay wurde gezeigt, dass die Induktion durch PB unter der Kontrolle des CYP2B1-Promotors von einem distalen PBREM (PB-responsive-enhancer-module), an welches CAR binden kann, abhängig war. PPARα-Agonisten steigerten diese PB- und PBREM-abhängige Reportergentranskription und induzierten die CAR-mRNA und CAR-Proteinexpression. Sie aktivierten die Transkription eines Reportergens unter der Kontrolle eines Promotorfragments von bis zu 4,4 kb oberhalb des mutmaßlichen CAR-Transkriptionsstarts. Mit Hilfe von Deletionskonstrukten konnte ein potentielles Peroxisomenproliferator-aktivierter-Rezeptor-responsives Element (PPRE) im CAR-Promotorbereich von -942 bp bis -930 bp identifiziert werden, welches essentiell für die Initiation der Transkription durch PPARα-Agonisten ist. In band shift Experimenten akkumulierte verstärkt Kernprotein mit diesem PPRE. Ein Überschuss an unmarkiertem Wildtyp-CAR-Reportergenvektor, nicht aber an CAR-Reportergenvektor mit PPRE-Deletion, konnte mit dem markierten PPRE um die Bindung von Kernprotein konkurrieren. Nach Chromatin-Immunpräzipitation mit einem PPARα-Antikörper wiederum wurde das betreffende PPRE amplifiziert. Bei in vivo Experimenten an männlichen Ratten resultierte die Behandlung mit PPARα-Agonisten in einer signifikanten Induktion der CAR-mRNA-Expression und signifikant erhöhter PB-abhängiger CYP2B-Aktivität. Die physiologisch Relevanz wurde durch weiterführenden Experimente unterstrichen, in denen gezeigt wurde, dass die Fasten-abhängige Induktion von CAR in PPARα-defizienten Mäusen unterdrückt war. Diese Experimente legen nahe, dass durch PPARα-Agonisten aktiviertes PPARα an das PPRE im CAR-Promotorbereich von -942 bp bis -930 bp bindet und dadurch die CAR-Transkription induziert. Somit kann CAR als PPARα-Zielgen betrachtet werden, was die Schlussfolgerung zulässt, dass die PPARα- und CAR-Signalwege über die direkte Bindung von PPARα an den CAR-Promotor unmittelbar miteinander verknüpft sind. Allerdings ist davon unabhängig eine Aktivierung von CAR, etwa durch PB, für die vermehrte Induktion von CAR-Zielgenen notwendig . Die physiologische Relevanz der PPARα-abhängige CAR-Expression zeigt sich in den Ganztierexperimenten, bei denen die Wirksamkeit der PPARα-Agonisten bestätigt werden konnte. CAR-abhängig induzierte Enzyme sind nicht nur in großem Umfang am Fremdstoffmetabolismus beteiligt, sondern auch am Abbau von Schilddrüsenhormonen und Glucocorticoiden. Sie können damit direkt Einfluss auf den Kohlenhydrat- und Energiestoffwechsel sowie die Regulation der Nahrungsaufnahme nehmen. Über eine PPARα-abhängige Induktion von CAR im Rahmen der Fastenadaption könnten die CAR-Zielgene UDP-Glucuronyltransferase 1A1 und Sulfotransferase N beispielsweise verstärkt Schilddrüsenhormone abbauen und in der Folge den Grundumsatz senken. Der in dieser Arbeit erstmals beschriebene Mechanismus ist dafür von zentraler Bedeutung.
Using ESTs for phylogenomics
(2008)
Background
While full genome sequences are still only available for a handful of taxa, large collections of partial gene sequences are available for many more. The alignment of partial gene sequences results in a multiple sequence alignment containing large gaps that are arranged in a staggered pattern. The consequences of this pattern of missing data on the accuracy of phylogenetic analysis are not well understood. We conducted a simulation study to determine the accuracy of phylogenetic trees obtained from gappy alignments using three commonly used phylogenetic reconstruction methods (Neighbor Joining, Maximum Parsimony, and Maximum Likelihood) and studied ways to improve the accuracy of trees obtained from such datasets.
Results
We found that the pattern of gappiness in multiple sequence alignments derived from partial gene sequences substantially compromised phylogenetic accuracy even in the absence of alignment error. The decline in accuracy was beyond what would be expected based on the amount of missing data. The decline was particularly dramatic for Neighbor Joining and Maximum Parsimony, where the majority of gappy alignments contained 25% to 40% incorrect quartets. To improve the accuracy of the trees obtained from a gappy multiple sequence alignment, we examined two approaches. In the first approach, alignment masking, potentially problematic columns and input sequences are excluded from from the dataset. Even in the absence of alignment error, masking improved phylogenetic accuracy up to 100-fold. However, masking retained, on average, only 83% of the input sequences. In the second approach, alignment subdivision, the missing data is statistically modelled in order to retain as many sequences as possible in the phylogenetic analysis. Subdivision resulted in more modest improvements to alignment accuracy, but succeeded in including almost all of the input sequences.
Conclusion
These results demonstrate that partial gene sequences and gappy multiple sequence alignments can pose a major problem for phylogenetic analysis. The concern will be greatest for high-throughput phylogenomic analyses, in which Neighbor Joining is often the preferred method due to its computational efficiency. Both approaches can be used to increase the accuracy of phylogenetic inference from a gappy alignment. The choice between the two approaches will depend upon how robust the application is to the loss of sequences from the input set, with alignment masking generally giving a much greater improvement in accuracy but at the cost of discarding a larger number of the input sequences.
Using individual-based modeling to understand grassland diversity and resilience in the Anthropocene
(2020)
The world’s grassland systems are increasingly threatened by anthropogenic change. Susceptible to a variety of different stressors, from land-use intensification to climate change, understanding the mechanisms driving the maintenance of these systems’ biodiversity and stability, and how these mechanisms may shift under human-mediated disturbance, is thus critical for successfully navigating the next century. Within this dissertation, I use an individual-based and spatially-explicit model of grassland community assembly (IBC-grass) to examine several processes, thought key to understanding their biodiversity and stability and how it changes under stress. In the first chapter of my thesis, I examine the conditions under which intraspecific trait variation influences the diversity of simulated grassland communities. In the second and third chapters of my thesis, I shift focus towards understanding how belowground herbivores influence the stability of these grassland systems to either a disturbance that results in increased, stochastic, plant mortality, or eutrophication.
Intraspecific trait variation (ITV), or variation in trait values between individuals of the same species, is fundamental to the structure of ecological communities. However, because it has historically been difficult to incorporate into theoretical and statistical models, it has remained largely overlooked in community-level analyses. This reality is quickly shifting, however, as a consensus of research suggests that it may compose a sizeable proportion of the total variation within an ecological community and that it may play a critical role in determining if species coexist. Despite this increasing awareness that ITV matters, there is little consensus of the magnitude and direction of its influence. Therefore, to better understand how ITV changes the assembly of grassland communities, in the first chapter of my thesis, I incorporate it into an established, individual-based grassland community model, simulating both pairwise invasion experiments as well as the assembly of communities with varying initial diversities. By varying the amount of ITV in these species’ functional traits, I examine the magnitude and direction of ITV’s influence on pairwise invasibility and community coexistence. During pairwise invasion, ITV enables the weakest species to more frequently invade the competitively superior species, however, this influence does not generally scale to the community level. Indeed, unless the community has low alpha- and beta- diversity, there will be little effect of ITV in bolstering diversity. In these situations, since the trait axis is sparsely filled, the competitively inferior may suffer less competition and therefore ITV may buffer the persistence and abundance of these species for some time.
In the second and third chapters of my thesis, I model how one of the most ubiquitous trophic interactions within grasslands, herbivory belowground, influences their diversity and stability. Until recently, the fundamental difficulty in studying a process within the soil has left belowground herbivory “out of sight, out of mind.” This dilemma presents an opportunity for simulation models to explore how this understudied process may alter community dynamics. In the second chapter of my thesis, I implement belowground herbivory – represented by the weekly removal of plant biomass – into IBC-grass. Then, by introducing a pulse disturbance, modelled as the stochastic mortality of some percentage of the plant community, I observe how the presence of belowground herbivores influences the resistance and recovery of Shannon diversity in these communities. I find that high resource, low diversity, communities are significantly more destabilized by the presence of belowground herbivores after disturbance. Depending on the timing of the disturbance and whether the grassland’s seed bank persists for more than one season, the impact of the disturbance – and subsequently the influence of the herbivores – can be greatly reduced. However, because human-mediated eutrophication increases the amount of resources in the soil, thus pressuring grassland systems, our results suggest that the influence of these herbivores may become more important over time.
In the third chapter of my thesis, I delve further into understanding the mechanistic underpinnings of belowground herbivores on the diversity of grasslands by replicating an empirical mesocosm experiment that crosses the presence of herbivores above- and below-ground with eutrophication. I show that while aboveground herbivory, as predicted by theory and frequently observed in experiments, mitigates the impact of eutrophication on species diversity, belowground herbivores counterintuitively reduce biodiversity. Indeed, this influence positively interacts with the eutrophication process, amplifying its negative impact on diversity. I discovered the mechanism underlying this surprising pattern to be that, as the herbivores consume roots, they increase the proportion of root resources to root biomass. Because root competition is often symmetric, herbivory fails to mitigate any asymmetries in the plants’ competitive dynamics. However, since the remaining roots have more abundant access to resources, the plants’ competition shifts aboveground, towards asymmetric competition for light. This leads the community towards a low-diversity state, composed of mostly high-performance, large plant species. We further argue that this pattern will emerge unless the plants’ root competition is asymmetric, in which case, like its counterpart aboveground, belowground herbivory may buffer diversity by reducing this asymmetry between the competitively superior and inferior plants.
I conclude my dissertation by discussing the implications of my research on the state of the art in intraspecific trait variation and belowground herbivory, with emphasis on the necessity of more diverse theory development in the study of these fundamental interactions. My results suggest that the influence of these processes on the biodiversity and stability of grassland systems is underappreciated and multidimensional, and must be thoroughly explored if researchers wish to predict how the world’s grasslands will respond to anthropogenic change. Further, should researchers myopically focus on understanding central ecological interactions through only mathematically tractable analyses, they may miss entire suites of potential coexistence mechanisms that can increase the coviability of species, potentially leading to coexistence over ecologically-significant timespans. Individual-based modelling, therefore, with its focus on individual interactions, will prove a critical tool in the coming decades for understanding how local interactions scale to larger contexts, and how these interactions shape ecological communities and further predicting how these systems will change under human-mediated stress.
The activity of vacuolar H+-ATPase (V-ATPase) in the apical membrane of blowfly (Calliphora vicina) salivary glands is regulated by the neurohormone serotonin (5-HT). 5-HT induces, via protein kinase A, the phosphorylation of V-ATPase subunit C and the assembly of V-ATPase holoenzymes. The protein phosphatase responsible for the dephosphorylation of subunit C and V-ATPase inactivation is not as yet known. We show here that inhibitors of protein phosphatases PP1 and PP2A (tautomycin, ocadaic acid) and PP2B (cyclosporin A, FK-506) do not prevent V-ATPase deactivation and dephosphorylation of subunit C. A decrease in the intracellular Mg2+ level caused by loading secretory cells with EDTA-AM leads to the activation of proton pumping in the absence of 5-HT, prolongs the 5-HT-induced response in proton pumping, and inhibits the dephosphorylation of subunit C. Thus, the deactivation of V-ATPase is most probably mediated by a protein phosphatase that is insensitive to okadaic acid and that requires Mg2+, namely, a member of the PP2C protein family. By molecular biological techniques, we demonstrate the expression of at least two PP2C protein family members in blowfly salivary glands. © 2009 Wiley Periodicals, Inc.
Vacuole integrity maintained by DUF300 proteins is required for brassinosteroid signaling regulation
(2018)
Brassinosteroid (BR) hormone signaling controls multiple processes during plant growth and development and is initiated at the plasma membrane through the receptor kinase BRASSINOSTEROID INSENSITIVE1 (BRI1) together with co-receptors such as BRI1-ASSOCIATED RECEPTOR KINASE1 (BAK1). BRI1 abundance is regulated by endosomal recycling and vacuolar targeting, but the role of vacuole-related proteins in BR receptor dynamics and BR responses remains elusive. Here, we show that the absence of two DUF300 domain-containing tonoplast proteins, LAZARUS1 (LAZ1) and LAZ1 HOMOLOG1 (LAZ1H1), causes vacuole morphology defects, growth inhibition, and constitutive activation of BR signaling. Intriguingly, tonoplast accumulation of BAK1 was substantially increased and appeared causally linked to enhanced BRI1 trafficking and degradation in laz1 laz1h1 plants. Since unrelated vacuole mutants exhibited normal BR responses, our findings indicate that DUF300 proteins play distinct roles in the regulation of BR signaling by maintaining vacuole integrity required to balance subcellular BAK1 pools and BR receptor distribution.
In order to improve a recently established cell-based assay to assess the potency of botulinum neurotoxin, neuroblastoma-derived SiMa cells and induced pluripotent stem-cells (iPSC) were modified to incorporate the coding sequence of a reporter luciferase into a genetic safe harbor utilizing CRISPR/Cas9. A novel method, the double-control quantitative copy number PCR (dc-qcnPCR), was developed to detect off-target integrations of donor DNA. The donor DNA insertion success rate and targeted insertion success rate were analyzed in clones of each cell type. The dc-qcnPCR reliably quantified the copy number in both cell lines. The probability of incorrect donor DNA integration was significantly increased in SiMa cells in comparison to the iPSCs. This can possibly be explained by the lower bundled relative gene expression of a number of double-strand repair genes (BRCA1, DNA2, EXO1, MCPH1, MRE11, and RAD51) in SiMa clones than in iPSC clones. The dc-qcnPCR offers an efficient and cost-effective method to detect off-target CRISPR/Cas9-induced donor DNA integrations.
Puumala virus (PUUV) causes many human infections in large parts of Europe and can lead to mild to moderate disease. The bank vole (Myodes glareolus) is the only reservoir of PUUV in Central Europe. A commercial PUUV rapid field test for rodents was validated for bank-vole blood samples collected in two PUUV-endemic regions in Germany (North Rhine-Westphalia and Baden-Wurttemberg). A comparison of the results of the rapid field test and standard ELISAs indicated a test efficacy of 93-95%, largely independent of the origin of the antigens used in the ELISA. In ELISAs, reactivity for the German PUUV strain was higher compared to the Swedish strain but not compared to the Finnish strain, which was used for the rapid field test. In conclusion, the use of the rapid field test can facilitate short-term estimation of PUUV seroprevalence in bank-vole populations in Germany and can aid in assessing human PUUV infection risk.
Der Buchfinkengesang wurde in Potsdam in zwei Hauptpopulationen über drei Jahre aufgenommen. Jedes Individuum wurde eindeutig am individuellen Strophentypenrepertoire identifiziert. Ein weiterer Punkt der die individuelle Wiedererkennung bestätigt ist die hohe Standorttreue der adulten Männchen. Die beschriebene Methode eignet sich für die Untersuchung von gesamten Populationen, um den Wandel des Gesangs von Populationen in Raum und Zeit zu beschreiben. Die Haupterkenntnisse der Arbeit sind: - Die Gesamtanzahl der Grundstrophentypen innerhalb einer Population bleibt über Jahre konstant. - Die relative Häufigkeit jedes einzelnen Strophentyps variiert von Jahr zu Jahr und von Population zu Population. - Gesangslernen erfolgt exakt mit einem Korrektheitsgrad von mindestens 96%. - Das Song-Sharing ist innerhalb der Population hoch. Die diskutierten Mechanismen für das Song-Sharing sind: Die Lebenserwartung, das Zugverhalten, das Lernverhalten, die Etabliertheit von Strophentypen, Weibchenpräferenzen und die Reaktionen der territorialen Männchen. - Weiterhin wurde ein Modell zur kulturellen Evolution des Buchfinkengesangs programmiert, um die Rolle der Einflussfaktoren, wie Fehlerquote, Abwanderungsrate und Laufzeit zu ermitteln. Der Wandel des Dialektes erfolgt graduell in Raum und Zeit. Daher sind keine scharfen Dialektgrenzen anzutreffen. Trotz dieser Tatsache markieren die etablierten Strophentypen die Population. 50 % der Juvenilen siedeln am Geburtsort, auf diese Weise bleibt der Dialekt erhalten und Inzest wird vermieden. -Analysiert man das Repertoire benachbarten Männchen bei isolierten Alleen, so entspricht die Gesangsangleichung in etwa dem Zufall. -Intraindividuelle Vergleiche der quantitativen Parameter des jeweiligen Strophentyps wurden saisonal und annuell durchgeführt. Saisonal konnten für einen Strophentyp ein Trend ermittelt werden. Bei jährlichen Vergleichen konnten intraindividuell ausschließlich nicht signifikante Ergebnisse ermittelt werden, wohingegen die interindividuelle Variation in zwei Fällen signifikant war. In einem Fall bestand ein Trend und in einem weiteren Fall war die Variationsunterschiede nicht signifikant. - Der Verlauf der Brutsaison lässt sich an der jährlichen Gesangsaktivität nachvollziehen.
Plastic pollution is an increasing environmental problem, but a comprehensive understanding of its effect in the environment is still missing. The wide variety of size, shape, and polymer composition of plastics impedes an adequate risk assessment. We investigated the effect of differently sized polystyrene beads (1-, 3-, 6-µm; PS) and polyamide fragments (5–25 µm, PA) and non-plastics items such as silica beads (3-µm, SiO2) on the population growth, reproduction (egg ratio), and survival of two common aquatic micro invertebrates: the rotifer species Brachionus calyciflorus and Brachionus fernandoi. The MPs were combined with food quantity, limiting and saturating food concentration, and with food of different quality. We found variable fitness responses with a significant effect of 3-µm PS on the population growth rate in both rotifer species with respect to food quantity. An interaction between the food quality and the MPs treatments was found in the reproduction of B. calyciflorus. PA and SiO2 beads had no effect on fitness response. This study provides further evidence of the indirect effect of MPs in planktonic rotifers and the importance of testing different environmental conditions that could influence the effect of MPs.
Plastic pollution is an increasing environmental problem, but a comprehensive understanding of its effect in the environment is still missing. The wide variety of size, shape, and polymer composition of plastics impedes an adequate risk assessment. We investigated the effect of differently sized polystyrene beads (1-, 3-, 6-µm; PS) and polyamide fragments (5–25 µm, PA) and non-plastics items such as silica beads (3-µm, SiO2) on the population growth, reproduction (egg ratio), and survival of two common aquatic micro invertebrates: the rotifer species Brachionus calyciflorus and Brachionus fernandoi. The MPs were combined with food quantity, limiting and saturating food concentration, and with food of different quality. We found variable fitness responses with a significant effect of 3-µm PS on the population growth rate in both rotifer species with respect to food quantity. An interaction between the food quality and the MPs treatments was found in the reproduction of B. calyciflorus. PA and SiO2 beads had no effect on fitness response. This study provides further evidence of the indirect effect of MPs in planktonic rotifers and the importance of testing different environmental conditions that could influence the effect of MPs.
Genetic divergence and the frequency of hybridization are central for defining species delimitations, especially among cryptic species where morphological differences are merely absent. Rotifers are known for their high cryptic diversity and therefore are ideal model organisms to investigate such patterns. Here, we used the recently resolved Brachionus calyciflorus species complex to investigate whether previously observed between species differences in thermotolerance and gene expression are also reflected in their genomic footprint. We identified a Heat Shock Protein gene (HSP 40 kDa) which exhibits cross species pronounced sequence variation. This gene exhibits species-specific fixed sites, alleles, and sites putatively under positive selection. These sites are located in protein binding regions involved in chaperoning and may therefore reflect adaptive diversification. By comparing three genetic markers (ITS, COI, HSP 40 kDa), we revealed hybridization events between the cryptic species. The low frequency of introgressive haplotypes/alleles suggest a tight, but not fully impermeable boundary between the cryptic species.
Resource distribution heterogeneity offers niche opportunities for species with different functional traits to develop and potentially coexist. Available light (photosynthetically active radiation or PAR) for suspended algae (phytoplankton) may fluctuate greatly over time and space. Species-specific light acquisition traits capture important aspects of the ecophysiology of phytoplankton and characterize species growth at either limiting or saturating daily PAR supply. Efforts have been made to explain phytoplankton coexistence using species-specific light acquisition traits under constant light conditions, but not under fluctuating light regimes that should facilitate non-equilibrium coexistence. In the well-mixed, hypertrophic Lake TaiHu (China), we incubated the phytoplankton community in bottles placed either at fixed depths or moved vertically through the water column to mimic vertical mixing. Incubations at constant depths received only the diurnal changes in light, while the moving bottles received rapidly fluctuating light. Species-specific light acquisition traits of dominant cyanobacteria (Anabaena flos-aquae, Microcystis spp.) and diatom (Aulacoseira granulata, Cyclotella pseudostelligera) species were characterized from their growth-light relationships that could explain relative biomasses along the daily PAR gradient under both constant and fluctuating light. Our study demonstrates the importance of interspecific differences in affinities to limiting and saturating light for the coexistence of phytoplankton species in spatially heterogeneous light conditions. Furthermore, we observed strong intraspecific differences in light acquisition traits between incubation under constant and fluctuating light - leading to the reversal of light utilization strategies of species. This increased the niche space for acclimated species, precluding competitive exclusion. These observations could enhance our understanding of the mechanisms behind the Paradox of the Plankton.
Understanding the molecular basis of morphological change remains a central challenge in evolutionary-developmental biology. The transition from outbreeding to selfing is often associated with a dramatic reduction in reproductive structures and functions, such as the loss of attractive pheromones in hermaphroditic Caenorhabditis elegans and a reduced flower size in plants. Here, we demonstrate that variation in the level of the brassinosteroid-biosynthesis enzyme CYP724A1 contributes to the reduced flower size of selfing Capsella rubella compared with its outbreeding ancestor Capsella grandiflora. The primary transcript of the C. rubella allele is spliced more efficiently than that of C. grandiflora, resulting in higher brassinosteroid levels. These restrict organ growth by limiting cell proliferation. More efficient splicing of the C. rubella allele results from two de novo mutations in the selfing lineage. Thus, our results highlight the potentially widespread importance of differential splicing efficiency and higher-than-optimal hormone levels in generating phenotypic variation.
The nature of the interaction between prehistoric humans and their environment, especially the vegetation, has long been of interest. The Qinghai Lake Basin in North China is well-suited to exploring the interactions between prehistoric humans and vegetation in the Tibetan Plateau, because of the comparatively dense distribution of archaeological sites and the ecologically fragile environment. Previous pollen studies of Qinghai Lake have enabled a detailed reconstruction of the regional vegetation, but they have provided relatively little information on vegetation change within the Qinghai Lake watershed. To address the issue we conducted a pollen-based vegetation reconstruction for an archaeological site (YWY), located on the southern shore of Qinghai Lake. We used high temporal-resolution pollen records from the YWY site and from Qinghai Lake, spanning the interval since the last deglaciation (15.3 kyr BP to the present) to quantitatively reconstruct changes in the local and regional vegetation using Landscape Reconstruction Algorithm models. The results show that, since the late glacial, spruce forest grew at high altitudes in the surrounding mountains, while the lakeshore environment was occupied mainly by shrub-steppe. From the lateglacial to the middle Holocene, coniferous woodland began to expand downslope and reached the YWY site at 7.1 kyr BP. The living environment of the local small groups of Paleolithic-Epipaleolithic humans (during 15.3-13.1 kyr BP and 9-6.4 kyr BP) changed from shrub-steppe to coniferous forest-steppe. The pollen record shows no evidence of pronounced changes in the vegetation community corresponding to human activity. However, based on a comparison of the local and regional vegetation reconstructions, low values of biodiversity and a significant increase in two indicators of vegetation degradation, Chenopodiaceae and Rosaceae, suggest that prehistoric hunters-gatherers likely disturbed the local vegetation during 9.0-6.4 kyr BP. Our findings are a preliminary attempt to study human-environment interactions at Paleolithic-Epipaleolithic sites in the region, and they contribute to ongoing environmental archaeology research in the Tibetan Plateau.
Relationships between climate, species composition, and species richness are of particular importance for understanding how boreal ecosystems will respond to ongoing climate change. This study aims to reconstruct changes in terrestrial vegetation composition and taxa richness during the glacial Late Pleistocene and the interglacial Holocene in the sparsely studied southeastern Yakutia (Siberia) by using pollen and sedimentary ancient DNA (sedaDNA) records. Pollen and sedaDNA metabarcoding data using the trnL g and h markers were obtained from a sediment core from Lake Bolshoe Toko. Both proxies were used to reconstruct the vegetation composition, while metabarcoding data were also used to investigate changes in plant taxa richness. The combination of pollen and sedaDNA approaches allows a robust estimation of regional and local past terrestrial vegetation composition around Bolshoe Toko during the last similar to 35,000 years. Both proxies suggest that during the Late Pleistocene, southeastern Siberia was covered by open steppe-tundra dominated by graminoids and forbs with patches of shrubs, confirming that steppe-tundra extended far south in Siberia. Both proxies show disturbance at the transition between the Late Pleistocene and the Holocene suggesting a period with scarce vegetation, changes in the hydrochemical conditions in the lake, and in sedimentation rates. Both proxies document drastic changes in vegetation composition in the early Holocene with an increased number of trees and shrubs and the appearance of new tree taxa in the lake's vicinity. The sedaDNA method suggests that the Late Pleistocene steppe-tundra vegetation supported a higher number of terrestrial plant taxa than the forested Holocene. This could be explained, for example, by the "keystone herbivore" hypothesis, which suggests that Late Pleistocene megaherbivores were able to maintain a high plant diversity. This is discussed in the light of the data with the broadly accepted species-area hypothesis as steppe-tundra covered such an extensive area during the Late Pleistocene.
Ecological niche models (ENMs) are often used to investigate how climatic variables from known occurrence records can estimate potential species range distribution. Although climate-based ENMs provide critical baseline information, the inclusion of non-climatic predictors related to vegetation cover might generate more realistic scenarios. This assumption is particularly relevant for species with life-history traits related to forest habitats and sensitive to habitat loss and fragmentation. Here, we developed ENMs for 36 Atlantic Forest endemic birds considering two sets of predictor variables: (i) climatic variables only and (ii) climatic variables combined with the percentage of remaining native vegetation. We hypothesized that the inclusion of native vegetation data would decrease the potential range distribution of forest-dependent species by limiting their occurrence in regions harboring small areas of native vegetation habitats, despite otherwise favorable climatic conditions. We also expected that habitat restriction in the climate-vegetation models would be more pronounced for highly forest-dependent birds. The inclusion of vegetation data in the modeling procedures restricted the final distribution ranges of 22 out of 36 modeled species, while the 14 remaining presented an expansion of their ranges. We observed that species with high and medium forest dependency showed higher restriction in range size predictions between predictor sets than species with low forest dependency, which showed no alteration or range expansion. Overall, our results suggest that ENMs based on climatic and landscape variables may be a useful tool for conservationists to better understand the dynamic of bird species distributions in threatened and highly fragmented regions such as the Atlantic Forest hotspot.(c) 2021 Associacao Brasileira de Cie circumflex accent ncia Ecol ogica e Conservacao. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/ ).
Shrub encroachment has far-reaching ecological and economic consequences in many ecosystems worldwide. Yet, compositional changes associated with shrub encroachment are often overlooked despite having important effects on ecosystem functioning. We document the compositional change and potential drivers for a northern Namibian Combretum woodland transitioning into a Terminalia shrubland. We use a multiproxy record (pollen, sedimentary ancient DNA, biomarkers, compound-specific carbon (delta C-13) and deuterium (delta D) isotopes, bulk carbon isotopes (delta(13)Corg), grain size, geochemical properties) from Lake Otjikoto at high taxonomical and temporal resolution. We provide evidence that state changes in semiarid environments may occur on a scale of one century and that transitions between stable states can span around 80 years and are characterized by a unique vegetation composition. We demonstrate that the current grass/woody ratio is exceptional for the last 170 years, as supported by n-alkane distributions and the delta C-13 and delta(13)Corg records. Comparing vegetation records to environmental proxy data and census data, we infer a complex network of global and local drivers of vegetation change. While our delta D record suggests physiological adaptations of woody species to higher atmospheric pCO(2) concentration and drought, our vegetation records reflect the impact of broad-scale logging for the mining industry, and the macrocharcoal record suggests a decrease in fire activity associated with the intensification of farming. Impact of selective grazing is reflected by changes in abundance and taxonomical composition of grasses and by an increase of nonpalatable and trampling-resistant taxa. In addition, grain-size and spore records suggest changes in the erodibility of soils because of reduced grass cover. Synthesis. We conclude that transitions to an encroached savanna state are supported by gradual environmental changes induced by management strategies, which affected the resilience of savanna ecosystems. In addition, feedback mechanisms that reflect the interplay between management legacies and climate change maintain the encroached state.
Vergleich von rekombinanten Vaccinia- und DNA-Vektoren zur Tumorimmuntherapie im C57BL/6-Mausmodell
(2002)
In der vorliegenden Arbeit wurden Tumorimpfstoffe auf der Basis des Plasmid-Vektors pCI, modified vaccinia virus Ankara (MVA) und MVA-infizierten dendritischen Zellen entwickelt und durch Sequenzierung, Western blotting und durchflußzytometrische Analyse überprüft. Die in vivo Wirksamkeit der Vakzinen wurde in verschiedenen Tumormodellen in C57BL/6 Mäusen verglichen. Die auf dem eukaryotischen Expressionsvektor pCI basierende DNA-Vakzinierung induzierte einen sehr wirksamen, antigenspezifischen und langfristigen Schutz vor Muzin, CEA oder beta-Galactosidase exprimierenden Tumoren. Eine MVA-Vakzinierung bietet in den in dieser Arbeit durchgeführten Tumormodellen keinen signifikanten Schutz vor Muzin oder beta-Galactosidase exprimierenden Tumoren. Sowohl humane, als auch murine in vitro generierte dendritische Zellen lassen sich mit MVA – im Vergleich zu anderen viralen Vektoren – sehr gut infizieren. Die Expressionsrate der eingefügten Gene ist aber gering im Vergleich zur Expression in permissiven Wirtszellen des Virus (embryonale Hühnerfibroblasten). Es konnte gezeigt werden, daß eine MVA-Infektion dendritischer Zellen ähnliche Auswirkungen auf den Reifezustand humaner und muriner dendritischer Zellen hat, wie eine Infektion mit replikationskompetenten Vakzinia-Stämmen, und außerdem die Hochregulation von CD40 während der terminalen Reifung von murinen dendritischen Zellen inhibiert wird. Die während der langfristigen in vitro Kultur auf CEF-Zellen entstandenen Deletionen im MVA Genom führten zu einer starken Attenuierung und dem Verlust einiger Gene, die immunmodulatorische Proteine kodieren, jedoch nicht zu einer Verminderung des zytopathischen Effekts in dendritischen Zellen. Die geringe Expressionsrate und die beobachtete Inhibition der Expression kostimulatorischer Moleküle auf dendritischen Zellen kann für eine wenig effektive Induktion einer Immunantwort in MVA vakzinierten Tieren durch cross priming oder die direkte Infektion antigenpräsentierender Zellen verantwortlich sein. Durch die Modifikation einer Methode zur intrazellulären IFN-gamma Färbung konnten in vakzinierten Mäusen tumorantigenspezifische CTL sensitiv und quantitativ detektiert werden. Die so bestimmte CTL-Frequenz, nicht jedoch die humorale Antwort, korrelierte mit der in vivo Wirksamkeit der verschiedenen Vakzinen: DNA vakzinierte Tiere entwickeln starke tumorantigenspezifische CTL-Antworten, wohingegen in MVA-vakzinierten Tieren überwiegend gegen virale Epitope gerichtete CD4 und CD8-T-Zellen detektiert wurden. Die Wirksamkeit der pCI-DNA-Vakzine spricht für die Weiterentwicklung in weiteren präklinischen Mausmodellen, beispielsweise unter Verwendung von MUC1 oder HLA-A2 transgenen Mäusen. Die Methoden zur Detektion Tumorantigen-spezifischer CTL in 96-Loch-Mikrotiterplatten können dabei zur systematischen Suche nach im Menschen immundominanten T-Zell-Epitopen im Muzin-Molekül genutzt werden. Der durchgeführte Vergleich der auf den Vektoren pCI und MVA basierenden Vakzinen und die Analyse neuerer Publikationen führen zu dem Ergebnis, daß vor allem DNA-Vakzinen in Zukunft eine wichtige Rolle bei der Entwicklung von aktiven Tumorimpfstoffen spielen werden. Rekombinante MVA-Viren, eventuell in Kombination mit DNA- oder anderen Vektoren, haben sich dagegen in zahlreichen Studien als wirksame Impfstoffe zur Kontrolle von durch Pathogene hervorgerufenen Infektionserkrankungen erwiesen.
Escherichia (E.) coli ist als kommensales Bakterium ein wichtiger Bestandteil des Mikrobioms von Säugern, jedoch zudem der häufigste Infektionserreger des Menschen. Entsprechend des Infektionsortes werden intestinal (InPEC) und extraintestinal pathogene E. coli (ExPEC) unterschieden. Die Pathogenese von E. coli-Infektionen ist durch Virulenzfaktoren determiniert, welche von jeweils spezifischen virulenzassoziierten Genen (inVAGs und exVAGs) kodiert werden. Häufig werden exVAGs auch in E. coli-Isolaten aus dem Darm gesunder Wirte nachgewiesen. Dies führte zu der Vermutung, dass exVAGs die intestinale Kolonisierung des Wirtes durch E. coli unterstützen. Das Hauptziel dieser Arbeit bestand darin, das Wissen über den Einfluss von exVAGs auf die Besiedlung und damit die Adhäsion von E. coli an Epithelzellen des Darmtraktes zu erweitern. Die Durchführung einer solch umfassenden E. coli-Populationsstudie erforderte die Etablierung neuer Screeningmethoden. Für die genotypische Charakterisierung wurden mikropartikelbasierte Multiplex-PCR-Assays zum Nachweis von 44 VAGs und der Phylogenie etabliert. Für die phänotypische Charakterisierung wurden Adhäsions- und Zytotoxizitätsassays etabliert. Die Screeningmethoden basieren auf der VideoScan-Technologie, einem automatisierten bildbasierten Multifluoreszenzdetektionssystem. Es wurden 398 E. coli-Isolate aus 13 Wildsäugerarten und 5 Wildvogelarten sowie aus gesunden und harnwegserkrankten Menschen und Hausschweinen charakterisiert. Die Adhäsionsassays hatten zum Ziel, sowohl die Adhäsionsraten als auch die Adhäsionsmuster der 317 nicht hämolytischen Isolate auf 5 Epithelzelllinien zu bestimmen. Die Zytotoxizität der 81 hämolytischen Isolate wurde in Abhängigkeit der Inkubationszeit auf 4 Epithelzelllinien geprüft. In den E. coli-Isolaten wurde eine Reihe von VAGs nachgewiesen. Potentielle InPEC, insbesondere shigatoxinproduzierende und enteropathogene E. coli wurden aus Menschen, Hausschweinen und Wildtieren, vor allem aus Rehen und Feldhasen isoliert. exVAGs wurden mit stark variierender Prävalenz in Isolaten aus allen Arten detektiert. Die größte Anzahl und das breiteste Spektrum an exVAGs wurde in Isolaten aus Urin harnwegserkrankter Menschen, gefolgt von Isolaten aus Dachsen und Rehen nachgewiesen. In Isolaten der phylogenetischen Gruppe B2 wurden mehr exVAGs detektiert als in den Isolaten der phylogenetischen Gruppen A, B1 und D. Die Ergebnisse der Adhäsionsassays zeigten, dass die meisten Isolate zelllinien-, gewebe- oder wirtsspezifisch adhärierten. Ein Drittel der Isolate adhärierte an keiner Zelllinie und nur zwei Isolate adhärierten stark an allen Zelllinien. Grundsätzlich adhärierten mehr Isolate an humanen sowie an intestinalen Zelllinien. Besonders Isolate aus Eichhörnchen und Amseln sowie aus Urin harnwegserkrankter Menschen und Hausschweine waren in der Lage, stark zu adhärieren. Hierbei bildeten die Isolate als Adhäsionsmuster diffuse Adhäsion, Mikrokolonien, Ketten und Agglomerationen. Mittels statistischer Analysen wurden Assoziationen zwischen exVAGs und einer hohen Adhäsionsrate ersichtlich. So war beispielsweise das Vorkommen von afa/dra mit einer höheren Adhäsionsrate auf Caco-2- und 5637-Zellen und von sfa/foc auf IPEC-J2-Zellen assoziiert. Die Ergebnisse der Zytotoxizitätsassays zeigten eine sehr starke und zeitabhängige Zerstörung der Monolayer aller Epithelzelllinien durch die α-Hämolysin-positiven Isolate. Auffallend war die hohe Toxizität hämolytischer Isolate aus Wildtieren gegenüber den humanen Zelllinien. Mit den innerhalb dieser Arbeit entwickelten Screeningmethoden war es möglich, große Mengen an Bakterien zu charakterisieren. Es konnte ein Überblick über die Verbreitung von VAGs in E. coli aus unterschiedlichen Wirten gewonnen werden. Besonders Wildtiere wurden sowohl durch den Nachweis von VAGs in den entsprechenden Isolaten, verbunden mit deren Adhäsionsfähigkeit und ausgeprägter Zytotoxizität als Reservoire pathogener E. coli identifiziert. Ebenso wurde eine zelllinienspezifische Adhäsion von Isolaten mit bestimmten exVAGs deutlich. Damit konnte der mögliche Einfluss von exVAGs auf die intestinale Kolonisierung bestätigt werden. In weiterführenden Arbeiten sind jedoch Expressions- und Funktionsanalysen der entsprechenden Proteine unerlässlich. Es wird anhand der Mikrokoloniebildung durch kommensale E. coli vermutet, dass Adhäsionsmuster und demzufolge Kolonisierungsstrategien, die bisher pathogenen E. coli zugeschrieben wurden, eher als generelle Kolonisierungsstrategien zu betrachten sind. Das E. coli-α-Hämolysin wirkt im Allgemeinen zytotoxisch auf Epithelzellen. Ein in der Fachliteratur diskutierter adhäsionsunterstützender Mechanismus dieses Toxins ist demnach fragwürdig. Innerhalb dieser Arbeit konnte gezeigt werden, dass die entwickelten Screeningmethoden umfassende Analysen einer großen Anzahl an E. coli-Isolaten ermöglichen.
Im Rahmen dieser Arbeit gelang es, katalytische Antikörper zur Hydrolyse von Benzylphenylcarbamaten sowie zahlreiche monoklonale Antikörper gegen Haptene herzustellen. Es wurden verschiedene Hapten-Protein-Konjugate unter Verwendung unterschiedlicher Kopplungsmethoden hergestellt und charakterisiert. Zur Generierung der hydrolytisch aktiven Antikörper wurden Inzuchtmäuse mit KLH-Konjugaten von 4 Übergangszustandsanaloga (ÜZA) immunisiert. Mit Hilfe der Hybridomtechnik wurden verschiedene monoklonale Antikörper gegen diese ÜZA gewonnen. Dabei wurden sowohl verschiedene Immunisierungsschemata als auch verschiedene Inzuchtmausstämme und Fusionstechniken verwendet. Insgesamt wurden 32 monoklonale Antikörper gegen die verwendeten ÜZA selektiert. Diese Antikörper wurden in großen Mengen hergestellt und gereinigt. Zum Nachweis der Antikörper-vermittelten Katalyse wurden verschiedene Methoden entwickelt und eingesetzt, darunter immunologische Nachweismethoden mit Anti-Substrat- und Anti-Produkt-Antikörpern und eine photometrische Methode mit Dimethylaminozimtaldehyd. Der Nachweis der hydrolytischen Aktivität gelang mit Hilfe eines Enzymsensors, basierend auf immobilisierter Tyrosinase. Die Antikörper N1-BC1-D11, N1-FA7-C4, N1-FA7-D12 und R3-LG2-F9 hydrolysierten die Benzylphenylcarbamate POCc18, POCc19 und Substanz 27. Der Nachweis der hydrolytischen Aktivität dieser Antikörper gelang auch mit Hilfe der HPLC. Der katalytische Antikörper N1-BC1-D11 wurde kinetisch und thermodynamisch untersucht. Es wurde eine Michaelis-Menten-Kinetik mit Km von 210 µM, vmax von 3 mM/min und kcat von 222 min-1 beobachtet. Diese Werte korrelieren mit den Werten der wenigen bekannten Diphenylcarbamat-spaltenden Abzyme. Die Beschleunigungsrate des Antikörpers N1-BC1-D11 betrug 10. Das ÜZA Hei3 hemmte die hydrolytische Aktivität. Dies beweist, dass die Hydrolyse in der Antigenbindungsstelle stattfindet. Weiter wurde zwischen der Antikörperkonzentration und der Umsatzgeschwindigkeit eine lineare Abhängigkeit festgestellt. Die thermodynamische Gleichtgewichtsdissoziationskonstante KD des Abzyms von 2,6 nM zeugt von einer sehr guten Affinität zum ÜZA. Hydrolytisch aktiv waren nur Antikörper, die gegen das Übergangszustandsanalogon Hei3 hergestellt worden waren. Es wird vermutet, dass die Hydrolyse der Benzylphenylcarbamate über einen Additions-Eliminierungsmechanismus unter Ausbildung eines tetraedrischen Übergangszustandes verläuft, dessen analoge Verbindung Hei3 ist. Im Rahmen der Generierung von Nachweisantikörpern zur Detektion der Substratabnahme bei der Hydrolyse wurden Anti-Diuron-Antikörper hergestellt. Einer der Antikörper (B91-CG5) ist spezifisch für das Herbizid Diuron und hat einen IC50-Wert von 0,19 µg/l und eine untere Nachweisgrenze von 0,04 µg/l. Ein anderer Antikörper (B91-KF5) reagiert kreuz mit einer Palette ähnlicher Herbizide. Mit diesen Antikörpern wurde ein empfindlicher Labortest, der ein Monitoring von Diuron auf Grundlage des durch die Trinkwasserverordnung festgeschriebenen Wertes für Pflanzenschutzmittel von 0,1 µg/l erlaubt, aufgebaut. Der Effekt der Anti-Diuron-Antikörper auf die Diuron-inhibierte Photosynthese wurde in vitro und in vivo untersucht. Es wurde nachgewiesen, dass sowohl in isolierten Thylakoiden, als auch in intakten Algen eine Vorinkubation der Anti-Diuron-Antikörper mit Diuron zur Inaktivierung seiner Photosynthese-hemmenden Wirkung führt. Wurde der Elektronentransport in den isolierten Thylakoiden oder in Algen durch Diuron unterbrochen, so führte die Zugabe der Anti-Diuron-Antikörper zur Reaktivierung der Elektronenübertragung.
Vielfalt in der Uckermark
(2019)
Secretory Wnt trafficking can be studied in the polarized epithelial monolayer of Drosophila wing imaginal discs (WID). In this tissue, Wg (Drosophila Wnt-I) is presented on the apical surface of its source cells before being internalized into the endosomal pathway. Long-range Wg secretion and spread depend on secondary secretion from endosomal compartments, but the exact post-endocytic fate of Wg is poorly understood. Here, we summarize and present three protocols for the immunofluorescencebased visualization and quantitation of different pools of intracellular and extracellular Wg in WID: (1) steady-state extracellular Wg; (2) dynamic Wg trafficking inside endosomal compartments; and (3) dynamic Wg release to the cell surface. Using a genetic driver system for gene manipulation specifically at the posterior part of the WID (EnGal4) provides a robust internal control that allows for direct comparison of signal intensities of control and manipulated compartments of the same WID. Therefore, it also circumvents the high degree of staining variability usually associated with whole-tissue samples. In combination with the genetic manipulation of Wg pathway components that is easily feasible in Drosophila, these methods provide a tool-set for the dissection of secretory Wg trafficking and can help us to understand how Wnt proteins travel along endosomal compartments for short-and long-range signal secretion.