4 results on '"Gisder, Sebastian"'
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2. Direct Evidence for Infection of Varroa destructor Mites with the Bee-Pathogenic Deformed Wing Virus Variant B, but Not Variant A, via Fluorescence In Situ Hybridization Analysis.
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Gisder, Sebastian and Genersch, Elke
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BEE colonies , *VARROA destructor , *MITES , *FLUORESCENCE in situ hybridization , *HONEYBEES , *INSECT anatomy , *IN situ hybridization - Abstract
Deformed wing virus (DWV) is a bee-pathogenic, single- and positivestranded RNA virus that has been involved in severe honey bee colony losses worldwide. DWV, when transmitted horizontally or vertically from bee to bee, causes mainly covert infections not associated with any visible symptoms or damage. Overt infections occur after vectorial transmission of DWV to the developing bee pupae through the ectoparasitic mite Varroa destructor. Symptoms of overt infections are pupal death, bees emerging with deformed wings and shortened abdomens, or cognitive impairment due to brain infection. So far, three variants of DWV, DWV-A, DWV-B, and DWV-C, have been described. While it is widely accepted that V. destructor acts as vector of DWV, the question of whether the mite only functions as a mechanical vector or whether DWV can infect the mite, thus using it as a biological vector, is hotly debated because in the literature data can be found that support both hypotheses. In order to settle this scientific dispute, we analyzed putatively DWVinfected mites with a newly established protocol for fluorescence in situ hybridization of mites and demonstrated DWV-specific signals inside mite cells. We provide compelling and direct evidence that DWV-B infects the intestinal epithelium and the salivary glands of V. destructor. In contrast, no evidence for DWV-A infecting mite cells was found. Our data are key to understanding the pathobiology of DWV, the mite's role as a biological DWV vector, and the quasispecies dynamics of this RNA virus when switching between insect and arachnid host species. IMPORTANCE Deformed wing virus (DWV) is a bee-pathogenic, originally rather benign, single- and positive-stranded RNA virus. Only the vectorial transmission of this virus to honey bees by the ectoparasitic mite Varroa destructor leads to fatal or symptomatic infections of individuals, usually followed by collapse of the entire colony. Studies on whether the mite only acts as a mechanical virus vector or whether DWV can infect the mite and thus use it as a biological vector have led to disparate results. In our study using fluorescence in situ hybridization, we provide compelling and direct evidence that at least the DWV-B variant infects the gut epithelium and the salivary glands of V. destructor. Hence, the host range of DWV includes both bees (Insecta) and mites (Arachnida). Our data contribute to a better understanding of the triangular relationship between honey bees, V. destructor, and DWV and the evolution of virulence in this viral bee pathogen. [ABSTRACT FROM AUTHOR]
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- 2021
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3. Unity in defence: honeybee workers exhibit conserved molecular responses to diverse pathogens (vol 18, 207, 2017)
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Doublet, Vincent, Poeschl, Yvonne, Gogol-Doering, Andreas, Alaux, Cedric, Annoscia, Desiderato, Aurori, Christian, Barribeau, Seth M, Bedoya-Reina, Oscar C, Brown, Mark JF, Bull, James C, Flenniken, Michelle L, Galbraith, David A, Genersch, Elke, Gisder, Sebastian, Grosse, Ivo, Holt, Holly L, Hultmark, Dan, Lattorff, H Michael G, Le Conte, Yves, Manfredini, Fabio, McMahon, Dino P, Moritz, Robin FA, Nazzi, Francesco, Nino, Elina L, Nowick, Katja, van Rij, Ronald P, Paxton, Robert J, Grozinger, Christina M, German Centre for Integrative Biodiversity Research (iDiv), Centre for Ecology and Conservation, University of Exeter, Cornwall Campus, Institute of Computer Science, Faculty of Networktechnologies and Multimedia Teleservices, University of Potsdam, Technische Hochschule Mittelhessen, Abeilles & Environnement (UR 406 ), Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Università degli Studi di Udine - University of Udine [Italie], University of Agricultural Sciences and Veterinary Medicine, East Carolina University, Western General Hospital, University of Edinburgh, Center for Comparative Genomics and Bioinformatics (CCBB), Pennsylvania State University (Penn State), Penn State System-Penn State System, MRC Functional Genomics Unit, Department of Physiology, Anatomy and Genetics, University of Oxford [Oxford], School of Biological Sciences, Royal Holloway [University of London] (RHUL), Department of Biosciences, Swansea University, Montana State University (MSU), Penn State System, Free University of Berlin (FU), Institute for Bee Research Hohen Neuendorf, University of Minnesota [Twin Cities] (UMN), University of Minnesota System, Department of Molecular Biology, Umeå University, International Centre of Insect Physiology and Ecology (ICIPE), Institute for Biology, University of Bergen (UiB), School of Biological Sciences [Belfast], Queen's University [Belfast] (QUB), Univ Halle Wittenberg, Inst Biol, Halle, Germany, Partenaires INRAE, German Ctr Integrat Biodivers Res iDiv, Leipzig, Germany, Department of Entomology and Nematology, University of California [Davis] (UC Davis), University of California-University of California, Leipzig University, and Radboud university [Nijmegen]
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RNA virus ,[SDV.BIO]Life Sciences [q-bio]/Biotechnology ,transcriptomique ,Immunology ,Immunity ,Biotechnologies ,Meta-analysis ,résistance aux agents pathogènes ,Nosema ,IAPV ,Immunologie ,Varroa destructor ,Co- expression network ,[SDV.IMM]Life Sciences [q-bio]/Immunology ,approche statistique ,Apis mellifera ,DWV ,Transcriptomics ,immunité ,bioinformatique - Abstract
International audience; Background: Organisms typically face infection by diverse pathogens, and hosts are thought to have developed specific responses to each type of pathogen they encounter. The advent of transcriptomics now makes it possible to test this hypothesis and compare host gene expression responses to multiple pathogens at a genome-wide scale. Here, we performed a meta-analysis of multiple published and new transcriptomes using a newly developed bioinformatics approach that filters genes based on their expression profile across datasets. Thereby, we identified common and unique molecular responses of a model host species, the honey bee (Apis mellifera), to its major pathogens and parasites: the Microsporidia Nosema apis and Nosema ceranae, RNA viruses, and the ectoparasitic mite Varroa destructor, which transmits viruses. Results: We identified a common suite of genes and conserved molecular pathways that respond to all investigated pathogens, a result that suggests a commonality in response mechanisms to diverse pathogens. We found that genes differentially expressed after infection exhibit a higher evolutionary rate than non-differentially expressed genes. Using our new bioinformatics approach, we unveiled additional pathogen-specific responses of honey bees; we found that apoptosis appeared to be an important response following microsporidian infection, while genes from the immune signalling pathways, Toll and Imd, were differentially expressed after Varroa/virus infection. Finally, we applied our bioinformatics approach and generated a gene co-expression network to identify highly connected (hub) genes that may represent important mediators and regulators of anti-pathogen responses.Conclusions: Our meta-analysis generated a comprehensive overview of the host metabolic and other biological processes that mediate interactions between insects and their pathogens. We identified key host genes and pathways that respond to phylogenetically diverse pathogens, representing an important source for future functional studies as well as offering new routes to identify or generate pathogen resilient honey bee stocks. The statistical and bioinformatics approaches that were developed for this study are broadly applicable to synthesize information across transcriptomic datasets. These approaches will likely have utility in addressing a variety of biological questions.
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- 2017
4. Evidence for damage-dependent hygienic behaviour towards Varroa destructor-parasitised brood in the western honey bee, Apis mellifera.
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Schöning, Caspar, Gisder, Sebastian, Geiselhardt, Sven, Kretschmann, Ivonne, Bienefeld, Kaspar, Hilker, Monika, and Genersch, Elke
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VARROA , *HONEYBEE behavior , *BROOD parasites , *MITE infestations , *IMMUNOREGULATION , *MICROBIAL virulence - Abstract
The ectoparasitic mite Varroa destructor and honey bee pathogenic viruses have been implicated in the recent demise of honey bee colonies. Several studies have shown that the combination of V. destructor and deformed wing virus (DWV) poses an especially serious threat to honey bee health. Mites transmitting virulent forms of DWV may cause fatal DWV infections in the developing bee, while pupae parasitised by mites not inducing or activating overt DWV infections may develop normally. Adult bees respond to brood diseases by removing affected brood. This hygienic behaviour is an essential part of the bees' immune response repertoire and is also shown towards mite-parasitised brood. However, it is still unclear whether the bees react towards the mite in the brood cell or rather towards the damage done to the brood. We hypothesised that the extent of mite-associated damage rather than the mere presence of parasitising mites triggers hygienic behaviour. Hygienic behaviour assays performed with mites differing in their potential to transmit overt DWV infections revealed that brood parasitised by 'virulent' mites (i.e. mites with a high potential to induce fatal DWV infections in parasitised pupae) were removed significantly more often than brood parasitised by 'less virulent' mites (i.e. mites with a very low potential to induce overt DWV infections) or non-parasitised brood. Chemical analyses of brood odour profiles suggested that the bees recognise severely affected brood by olfactory cues. Our results suggest that bees show selective, damage-dependent hygienic behaviour, which may be an economic way for colonies to cope with mite infestation. [ABSTRACT FROM AUTHOR]
- Published
- 2012
- Full Text
- View/download PDF
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