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A multistrain approach to studying the mechanisms underlying compatibility in the interaction between Biomphalaria glabrata and Schistosoma mansoni ArchiMer
Galinier, Richard; Roger, Emmanuel; Mone, Yves; Duval, David; Portet, Anais; Pinaud, Silvain; Chaparro, Cristian; Grunau, Christoph; Genthon, Clemence; Dubois, Emeric; Rognon, Anne; Arancibia, Nathalie; Dejean, Bernard; Theron, Andre; Gourbal, Benjamin; Mitta, Guillaume.
In recent decades, numerous studies have sought to better understand the mechanisms underlying the compatibility between Biomphalaria glabrata and Schistosoma mansoni. The developments of comparative transcriptomics, comparative genomics, interactomics and more targeted approaches have enabled researchers to identify a series of candidate genes. However, no molecular comparative work has yet been performed on multiple populations displaying different levels of compatibility. Here, we seek to fill this gap in the literature. We focused on B. glabrata FREPs and S. mansoni SmPoMucs, which were previously demonstrated to be involved in snail/schistosome compatibility. We studied the expression and polymorphisms of these factors in combinations of snail and...
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Ano: 2017 URL: https://archimer.ifremer.fr/doc/00388/49951/50515.pdf
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A Novel Bacterial Pathogen of Biomphalaria glabrata: A Potential Weapon for Schistosomiasis Control? ArchiMer
Duval, David; Galinier, Richard; Mouahid, Gabriel; Toulza, Eve; Allienne, Jean Francois; Portela, Julien; Calvayrac, Christophe; Rognon, Anne; Arancibia, Nathalie; Mitta, Guillaume; Theron, Andre; Gourbal, Benjamin.
Background Schistosomiasis is the second-most widespread tropical parasitic disease after malaria. Various research strategies and treatment programs for achieving the objective of eradicating schistosomiasis within a decade have been recommended and supported by the World Health Organization. One of these approaches is based on the control of snail vectors in endemic areas. Previous field studies have shown that competitor or predator introduction can reduce snail numbers, but no systematic investigation has ever been conducted to identify snail microbial pathogens and evaluate their molluscicidal effects. Methodology/Principal findings In populations of Biomphalaria glabrata snails experiencing high mortalities, white nodules were visible on snail...
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Ano: 2015 URL: https://archimer.ifremer.fr/doc/00615/72716/71712.pdf
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A Shift from Cellular to Humoral Responses Contributes to Innate Immune Memory in the Vector Snail Biomphalaria glabrata ArchiMer
Pinaud, Silvain; Portela, Julien; Duval, David; Nowacki, Fanny C.; Olive, Marie-aude; Allienne, Jean-francois; Galinier, Richard; Dheilly, Nolwenn M.; Kieffer-jaquinod, Sylvie; Mitta, Guillaume; Theron, Andre; Gourbal, Benjamin.
Discoveries made over the past ten years have provided evidence that invertebrate antiparasitic responses may be primed in a sustainable manner, leading to the failure of a secondary encounter with the same pathogen. This phenomenon called "immune priming" or "innate immune memory" was mainly phenomenological. The demonstration of this process remains to be obtained and the underlying mechanisms remain to be discovered and exhaustively tested with rigorous functional and molecular methods, to eliminate all alternative explanations. In order to achieve this ambitious aim, the present study focuses on the Lophotrochozoan snail, Biomphalaria glabrata, in which innate immune memory was recently reported. We provide herein the first evidence that a shift from a...
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Ano: 2016 URL: https://archimer.ifremer.fr/doc/00315/42664/71872.pdf
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A Sustained Immune Response Supports Long-Term Antiviral Immune Priming in the Pacific Oyster, Crassostrea gigas ArchiMer
Lafont, Maxime; Vergnes, Agnes; Vidal-dupiol, Jeremie; De Lorgeril, Julien; Gueguen, Yannick; Haffner, Philippe; Petton, Bruno; Chaparro, Cristian; Barrachina, Celia; Destoumieux-garzon, Delphine; Mitta, Guillaume; Gourbal, Benjamin; Montagnani, Caroline.
Over the last decade, innate immune priming has been evidenced in many invertebrate phyla. If mechanistic models have been proposed, molecular studies aiming to substantiate these models have remained scarce. We reveal here the transcriptional signature associated with immune priming in the oyster Crassostrea gigas. Oysters were fully protected against Ostreid herpesvirus 1 (OsHV-1), a major oyster pathogen, after priming with poly(I·C), which mimics viral double-stranded RNA. Global analysis through RNA sequencing of oyster and viral genes after immune priming and viral infection revealed that poly(I·C) induces a strong antiviral response that impairs OsHV-1 replication. Protection is based on a sustained upregulation of immune genes, notably genes...
Tipo: Text Palavras-chave: Innate immunity; Priming; OsHV-1; Antiviral response; Immune memory; Oyster; POMS; Poly(I·C); Interferon; Transcriptomic.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00614/72580/71541.pdf
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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.
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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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Epigenetic origin of adaptive phenotypic variants in the human blood fluke Schistosoma mansoni ArchiMer
Fneich, Sara; Theron, Andre; Cosseau, Celine; Rognon, Anne; Aliaga, Benoit; Buard, Jerome; Duval, David; Arancibia, Nathalie; Boissier, Jerome; Roquis, David; Mitta, Guillaume; Grunau, Christoph.
Background: Adaptive evolution is not possible without the generation of phenotypic variants. The origin of these variations has been a central topic in evolutionary biology. Up to now, it was commonly accepted that standing genetic variation is the only cause of phenotypic variants. However, epigenetic information is emerging as a complementary source of heritable phenotypic variation that contributes to evolution. The relative importance of genetics and epigenetics in generating heritable phenotypic variation is nevertheless a matter of debate. Results: We used a host-parasite system to address this question. The human blood fluke Schistosoma mansoni can adapt rapidly to new intermediate snail hosts. The interaction between parasite and mollusk is...
Tipo: Text Palavras-chave: Epigenetics; Adaptive evolution; Compatibility polymorphism; Schistosoma mansoni.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00615/72708/71730.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...
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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...
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Ano: 2011 URL: http://archimer.ifremer.fr/doc/00039/14996/12433.pdf
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Microbiota Composition and Evenness Predict Survival Rate of Oysters Confronted to Pacific Oyster Mortality Syndrome ArchiMer
Clerissi, Camille; De Lorgeril, Julien; Petton, Bruno; Lucasson, Aude; Escoubas, Jean Michel; Gueguen, Yannick; Dégremont, Lionel; Mitta, Guillaume; Toulza, Eve.
Pacific Oyster Mortality Syndrome (POMS) affects Crassostrea gigas oysters worldwide and causes important economic losses. Disease dynamic was recently deciphered and revealed a multiple and progressive infection caused by the Ostreid herpesvirus OsHV-1 μVar, triggering an immunosuppression followed by microbiota destabilization and bacteraemia by opportunistic bacterial pathogens. However, it remains unknown if microbiota might participate to protect oysters against POMS, and if microbiota characteristics might be predictive of oyster mortalities. To tackle this issue, we transferred full-sib progenies of resistant and susceptible oyster families from hatchery to the field during a period in favor of POMS. After 5 days of transplantation, oysters from...
Tipo: Text Palavras-chave: Holobiont; Microbiome; Metabarcoding; Fitness; Bacteria.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00621/73332/72500.pdf
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Oyster hemolymph is a complex and dynamic ecosystem hosting bacteria, protists and viruses ArchiMer
Dupont, Samuel; Lokmer, A.; Corre, E.; Auguet, Jean-christophe; Petton, Bruno; Toulza, E.; Montagnani, Caroline; Tanguy, G.; Pecqueur, D.; Salmeron, C.; Guillou, L.; Desnues, C.; La Scola, B.; Bou Khalil, J.; De Lorgeril, Julien; Mitta, Guillaume; Gueguen, Yannick; Escoubas, Jean Michel.
Background The impact of the microbiota on host fitness has so far mainly been demonstrated for the bacterial microbiome. We know much less about host-associated protist and viral communities, largely due to technical issues. However, all microorganisms within a microbiome potentially interact with each other as well as with the host and the environment, therefore likely affecting the host health. Results We set out to explore how environmental and host factors shape the composition and diversity of bacterial, protist and viral microbial communities in the Pacific oyster hemolymph, both in health and disease. To do so, five oyster families differing in susceptibility to the Pacific oyster mortality syndrome were reared in hatchery and transplanted into a...
Tipo: Text Palavras-chave: Oyster genetic background; Hemolymph microbiota dynamics; Early-life microbiota; Trans-kingdom interactions; Crassostrea gigas; Within-host ecosystem.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00627/73916/73254.pdf
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Separate the wheat from the chaff: genomic scan for local adaptation in the red coral Corallium rubrum ArchiMer
Pratlong, Marine; Haguenauer, Anne; Brener, Kelly; Mitta, Guillaume; Toulza, E; Garrabou, Joaquim; Bensoussan, Nathaniel; Pontarotti, Pierre; Aurelle, Didier.
Genomic data allow an in-depth and renewed study of local adaptation. The red coral (Corallium rubrum, Cnidaria) is a highly genetically structured species and a promising model for the study of adaptive processes along an environmental gradient. Here, we used RAD-Sequencing in order to study the vertical genetic structure of this species and to search for signals of local adaptation to depth and thermal regime in the red coral. Previous studies have shown different thermotolerance levels according to depth in this species which could correspond to genetic or environmental differences. We designed a sampling scheme with six pairs of ‘shallow vs deep’ populations distributed in three geographical regions as replicates. Our results showed significant...
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Ano: 2018 URL: https://archimer.ifremer.fr/doc/00615/72745/71893.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...
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Ano: 2014 URL: http://archimer.ifremer.fr/doc/00221/33265/31738.pdf
Registros recuperados: 22
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