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Registros recuperados: 13
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Advances in gastropod immunity from the study of the interaction between the snail Biomphalaria glabrata and its parasites: A review of research progress over the last decade ArchiMer
Coustau, C.; Gourbal, B.; Duval, D.; Yoshino, T. P.; Adema, C. M.; Mitta, Guillaume.
This review summarizes the research progress made over the past decade in the field of gastropod immunity resulting from investigations of the interaction between the snail Biomphalaria glabrata and its trematode parasites. A combination of integrated approaches, including cellular, genetic and comparative molecular and proteomic approaches have revealed novel molecular components involved in mediating Biomphalaria immune responses that provide insights into the nature of host-parasite compatibility and the mechanisms involved in parasite recognition and killing. The current overview emphasizes that the interaction between B. glabrata and its trematode parasites involves a complex molecular crosstalk between numerous antigens, immune receptors, effectors...
Tipo: Text Palavras-chave: Biomphalaria glabrata; Schistosoma mansoni; Echinostoma caproni; Immunity; Compatibility.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00276/38718/38622.pdf
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Comprendre et prédire les maladies multifactorielles de bivalves marins : le cas de l’huître ArchiMer
De Lorgeril, Julien; Gueguen, Yannick; Mitta, Guillaume.
Tipo: Text
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00487/59821/62964.pdf
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Differential basal expression of immune genes confers Crassostrea gigas resistance to Pacific Oyster Mortality Syndrome ArchiMer
De Lorgeril, Julien; Petton, Bruno; Lucasson, Aude; Perez, Valérie; Stenger, Pierre-louis; Degremont, Lionel; Montagnani, Caroline; Escoubas, Jean Michel; Haffner, Philippe; Allienne, Jean-françois; Leroy, Marc; Lagarde, Franck; Vidal Dupiol, Jeremie; Gueguen, Yannick; Mitta, Guillaume.
Background: As a major threat to the oyster industry, Pacific Oyster Mortality Syndrome (POMS) is a polymicrobial disease affecting the main oyster species farmed across the world. POMS affects oyster juveniles and became panzootic this last decade, but POMS resistance in some oyster genotypes has emerged. While we know some genetic loci associated with resistance, the underlying mechanisms remained uncharacterized. So, we developed a comparative transcriptomic approach using basal gene expression profiles between different oyster biparental families with contrasted phenotypes when confronted to POMS (resistant or susceptible). Results: We showed that POMS resistant oysters show differential expression of genes involved in stress responses, protein...
Tipo: Text Palavras-chave: Pacific oyster; Oyster disease; Resistance; OsHV-1; Antiviral molecular pathways; Invertebrate immunity..
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00602/71369/69811.pdf
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Differential distribution and defence involvement of antimicrobial peptides in mussel ArchiMer
Mitta, Guillaume; Vandenbulcke, Franck; Noel, Thierry; Romestand, Bernard; Beauvillain, Jean Claude; Salzet, Michel; Roch, Philippe.
In previous papers, we characterised 3 types of 4-kDa, cysteine-rich, cationic antimicrobial peptides: MGDs (for Mytilus galloprovincialis defensins), mytilins and myticins, which are abundant in the mussel hemocytes. In the present work, me revealed a differential distribution of the cells expressing the different genes. In addition, using confocal and electron microscopy, we confirmed that defensins and mytilins were partially located in different sub-types of circulating hemocytes although the peptides can be located in the same cell, and even in the same granule. We also demonstrated that mytilins exert their microbicidal effect within the cells through the process of phagosome-mytilin granule fusion leading to the co-location of ingested bacteria and...
Tipo: Text Palavras-chave: Innate immunity; Hemocyte; Mussel; Myticin; Mytilin; Defensin; Antimicrobial.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/2000/publication-413.pdf
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Effects of a parental exposure to diuron on Pacific oyster spat methylome ArchiMer
Rondon Sallan, Rodolfo; Grunau, Christoph; Fallet, Manon; Charlemagne, Nicolas; Sussarellu, Rossana; Chaparro, Cristian; Montagnani, Caroline; Mitta, Guillaume; Bachere, Evelyne; Akcha, Farida; Cosseau, Celine.
Environmental epigenetic is an emerging field that studies the cause-effect relationship between environmental factors and heritable trait via an alteration in epigenetic marks. This field has received much attentions since the impact of environmental factors on different epigenetic marks have been shown to be associated with a broad range of phenotypic disorders in natural ecosystems. Chemical pollutants have been shown to affect immediate epigenetic information carriers of several aquatic species but the heritability of the chromatin marks and the consequences for long term adaptation remain open questions. In this work, we investigated the impact of the diuron herbicide on the DNA methylation pattern of spat from exposed Crassotrea gigas genitors. This...
Tipo: Text Palavras-chave: Crassostrea gigas; Mollusk; DNA methylation; Herbicide; Epigenetic.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00602/71413/69895.pdf
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Evidence for a genetic sex determination in Cnidaria, the Mediterranean red coral (Coralliumrubrum) ArchiMer
Pratlong, M.; Haguenauer, A.; Chenesseau, S.; Brener, K.; Mitta, Guillaume; Toulza, E.; Bonabaud, M.; Rialle, S.; Aurelle, D.; Pontarotti, P..
dSexual reproduction is widespread among eukaryotes, and the sex-determining processes vary greatly among species. While genetic sex determination (GSD) has been intensively described in bilaterian species, no example has yet been recorded among non-bilaterians. However, the quasi-ubiquitous repartition of GSD among multicellular species suggests that similar evolutionary forces can promote this system, and that these forces could occur also in non-bilaterians. Studying sex determination across the range of Metazoan diversity is indeed important to understand better the evolution of this mechanism and its lability. We tested the existence of sexlinked genes in the gonochoric red coral (Corallium rubrum, Cnidaria) using restriction site-associated DNA...
Tipo: Text Palavras-chave: Genetic sex determination; Corallium rubrum; RAD-sequencing; Cnidaria.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00382/49367/49769.pdf
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Immune-suppression by OsHV-1 viral infection causes fatal bacteraemia in Pacific oysters ArchiMer
De Lorgeril, Julien; Lucasson, Aude; Petton, Bruno; Toulza, Eve; Montagnani, Caroline; Clerissi, Camille; Vidal-dupiol, Jeremie; Chaparro, Cristian; Galinier, Richard; Escoubas, Jean Michel; Haffner, Philippe; Degremont, Lionel; Charriere, Guillaume; Lafont, Maxime; Delort, Abigail; Vergnes, Agnes; Chiarello, Marlene; Faury, Nicole; Rubio, Tristan; Leroy, Marc; Perignon, Adeline; Regler, Denis; Morga, Benjamin; Alunno-bruscia, Marianne; Boudry, Pierre; Le Roux, Frederique; Destoumieux-garzon, Delphine; Gueguen, Yannick; Mitta, Guillaume.
Infectious diseases are mostly explored using reductionist approaches despite repeated evidence showing them to be strongly in fluenced by numerous interacting host and environmental factors. Many diseases with a complex aetiology therefore remain misunderstood. By developing a holistic approach to tackle the complexity of interactions, we decipher the complex intra-host interactions underlying Pacific oyster mortality syndrome affecting juveniles of Crassostrea gigas, the main oyster species exploited worldwide. Using experimental infections reproducing the natural route of infection and combining thorough molecular analyses of oyster families with contrasted susceptibilities, we demonstrate that the disease is caused by multiple infection with an initial...
Tipo: Text
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00461/57234/59228.pdf
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Implication des peptides antimicrobiens dans l'immunité innée de la moule, Mytilus galloprovincialis ArchiMer
Mitta, Guillaume.
Les mécanismes immunitaires innés des vertébrés sont une mosaïque de mécanismes ancestraux partagés avec des animaux évolutivement plus primitifs. Les peptides antimicrobiens sont une de ces composantes conservées au travers du règne animal. En effet, ils participent vraisemblablement chez tous les métazoaires aux processi d'immunité innée. Toutefois, leurs implications dans la réponse anti-infectieuse peuvent être assez différentes. L'objet de cette thèse était de comprendre comment ces peptides participaient aux processi de défense de la moule. Une première phase de caractérisation biochimique de telles molécules avait été entreprise chez la moule, Mytilus galloprovincialis, dans le cadre de la thèse de Florence Hubert. Notre travail a consisté (i) à...
Tipo: Text Palavras-chave: Immunité; Peptides; Antibiotiques; Moule; Défensine.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00439/55101/56547.pdf
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Innate Immune Responses of a Scleractinian Coral to Vibriosis ArchiMer
Vidal-dupiol, Jeremie; Ladriere, Ophelie; Destoumieux-garzon, Delphine; Sautiere, Pierre-eric; Meistertzheim, Anne-leila; Tambutte, Eric; Tambutte, Sylvie; Duval, David; Foure, Laurent; Adjeroud, Mehdi; Mitta, Guillaume.
Scleractinian corals are the most basal eumetazoan taxon and provide the biological and physical framework for coral reefs, which are among the most diverse of all ecosystems. Over the past three decades and coincident with climate change, these phototrophic symbiotic organisms have been subject to increasingly frequent and severe diseases, which are now geographically widespread and a major threat to these ecosystems. Although coral immunity has been the subject of increasing study, the available information remains fragmentary, especially with respect to coral antimicrobial responses. In this study, we characterized damicornin from Pocillopora damicornis, the first scleractinian antimicrobial peptide (AMP) to be reported. We found that its precursor has...
Tipo: Text
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00039/14996/12433.pdf
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Species-specific mechanisms of cytotoxicity toward immune cells determine the successful outcome of Vibrio infections ArchiMer
Rubio, Tristan; Oyanedel, Daniel; Labreuche, Yannick; Toulza, Eve; Luo, Xing; Bruto, Maxime; Chaparro, Cristian; Torres, Marta; De Lorgeril, Julien; Haffner, Philippe; Vidal-dupiol, Jeremie; Lagorce, Arnaud; Petton, Bruno; Mitta, Guillaume; Jacq, Annick; Le Roux, Frederique; Charriere, Guillaume; Destoumieux-garzon, Delphine.
Vibrio species cause infectious diseases in humans and animals, but they can also live as commensals within their host tissues. How Vibrio subverts the host defenses to mount a successful infection remains poorly understood, and this knowledge is critical for predicting and managing disease. Here, we have investigated the cellular and molecular mechanisms underpinning infection and colonization of 2 virulent Vibrio species in an ecologically relevant host model, oyster, to study interactions with marine Vibrio species. All Vibrio strains were recognized by the immune system, but only nonvirulent strains were controlled. We showed that virulent strains were cytotoxic to hemocytes, oyster immune cells. By analyzing host and bacterial transcriptional...
Tipo: Text Palavras-chave: T6SS; Toxin; Dual RNA-seq; Cytolysis; Pathogenesis.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00507/61837/65900.pdf
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Thermal regime and host clade, rather than geography, drive Symbiodinium and bacterial assemblages in the scleractinian coral Pocillopora damicornis sensu lato ArchiMer
Brener-raffalli, Kelly; Clerissi, Camille; Vidal-dupiol, Jeremie; Adjeroud, Mehdi; Bonhomme, Francois; Pratlong, Marine; Aurelle, Didier; Mitta, Guillaume; Toulza, Eve.
Background: Although the term holobiont has been popularized in corals with the advent of the hologenome theory of evolution, the underlying concepts are still a matter of debate. Indeed, the relative contribution of host and environment and especially thermal regime in shaping the microbial communities should be examined carefully to evaluate the potential role of symbionts for holobiont adaptation in the context of global changes. We used the sessile, long-lived, symbiotic and environmentally sensitive reef-building coral Pocillopora damicornis to address these issues. Results: We sampled Pocillopora damicornis colonies corresponding to two different mitochondrial lineages in different geographic areas displaying different thermal regimes: Djibouti,...
Tipo: Text Palavras-chave: Coral holobiont; Microbiota; Bacterial communities; Symbiodinium assemblages; Thermal adaptation; Scleractinian corals; Coral reefs; Pocillopora damicornis.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00429/54076/55380.pdf
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Thermal Stress Triggers Broad Pocillopora damicornis Transcriptomic Remodeling, while Vibrio coralliilyticus Infection Induces a More Targeted Immuno-Suppression Response ArchiMer
Vidal-dupiol, Jeremie; Dheilly, Nolwenn M.; Rondon, Rodolfo; Grunau, Christoph; Cosseau, Celine; Smith, Kristina M.; Freitag, Michael; Adjeroud, Mehdi; Mitta, Guillaume.
Global change and its associated temperature increase has directly or indirectly changed the distributions of hosts and pathogens, and has affected host immunity, pathogen virulence and growth rates. This has resulted in increased disease in natural plant and animal populations worldwide, including scleractinian corals. While the effects of temperature increase on immunity and pathogen virulence have been clearly identified, their interaction, synergy and relative weight during pathogenesis remain poorly documented. We investigated these phenomena in the interaction between the coral Pocillopora damicornis and the bacterium Vibrio coralliilyticus, for which the infection process is temperature-dependent. We developed an experimental model that enabled...
Tipo: Text
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00221/33265/31738.pdf
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Transcriptional changes in Crassostrea gigas oyster spat following a parental exposure to the herbicide diuron ArchiMer
Rondon, R.; Akcha, Farida; Alonso, P.; Menard, Dominique; Rouxel, Julien; Montagnani, Caroline; Mitta, Guillaume; Cosseau, C.; Grunau, C..
The Pacific oyster Crassostrea gigas is the main oyster species produced in the world, and a key coastal economic resource in France. High mortalities affect Pacific oysters since 2008 in France and Europe. Their origins have been attributed to a combination of biotic and abiotic factors, underlining the importance of environment quality. The impact of water pollution has been pointed out and one of the pollutants, the genotoxic herbicide diuron, occurs at high concentrations all along the French coasts. Previous work has revealed that a parental exposure to diuron had a strong impact on hatching rates and offspring development even if spats were not exposed to diuron themselves. In this study, we explored for the first time the transcriptional changes...
Tipo: Text Palavras-chave: Mollusk; Oyster; Diuron; Transcriptomic; Ecotoxicology.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00318/42938/42438.pdf
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