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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 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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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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Histone methylation changes are required for life cycle progression in the human parasite Schistosoma mansoni ArchiMer
Roquis, David; Taudt, Aaron; Geyer, Kathrin K.; Padalino, Gilda; Hoffmann, Karl F.; Holroyd, Nancy; Berriman, Matt; Aliaga, Benoit; Chaparro, Cristian; Grunau, Christoph; De Carvalho Augusto, Ronaldo.
Epigenetic mechanisms and chromatin structure play an important role in development. Their impact is therefore expected to be strong in parasites with complex life cycles and multiple, strikingly different, developmental stages, i.e. developmental plasticity. Some studies have already described how the chromatin structure, through histone modifications, varies from a developmental stage to another in a few unicellular parasites. While H3K4me3 profiles remain relatively constant, H3K27 trimethylation and bivalent methylation show strong variation. Inhibitors (A366 and GSK343) of H3K27 histone methyltransferase activity in S. mansoni efficiently blocked miracidium to sporocyst transition indicating that H3K27 trimethylation is required for life cycle...
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Ano: 2018 URL: https://archimer.ifremer.fr/doc/00445/55690/71773.s001
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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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Notos - a galaxy tool to analyze CpN observed expected ratios for inferring DNA methylation types ArchiMer
Bulla, Ingo; Aliaga, Benoit; Lacal, Virginia; Bulla, Jan; Grunau, Christoph; Chaparro, Cristian.
Background: DNA methylation patterns store epigenetic information in the vast majority of eukaryotic species. The relatively high costs and technical challenges associated with the detection of DNA methylation however have created a bias in the number of methylation studies towards model organisms. Consequently, it remains challenging to infer kingdom-wide general rules about the functions and evolutionary conservation of DNA methylation. Methylated cytosine is often found in specific CpN dinucleotides, and the frequency distributions of, for instance, CpG observed/expected (CpG o/e) ratios have been used to infer DNA methylation types based on higher mutability of methylated CpG. Results: Predominantly model-based approaches essentially founded on...
Tipo: Text Palavras-chave: Epigenetics; DNA methylation; Kernel density estimation; CpG o/e ratio; CpN o/e ratio.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00437/54816/71790.pdf
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On the Importance to Acknowledge Transposable Elements in Epigenomic Analyses ArchiMer
Lerat, Emmanuelle; Casacuberta, Josep; Chaparro, Cristian; Vieira, Cristina.
Eukaryotic genomes comprise a large proportion of repeated sequences, an important fraction of which are transposable elements (TEs). TEs are mobile elements that have a significant impact on genome evolution and on gene functioning. Although some TE insertions could provide adaptive advantages to species, transposition is a highly mutagenic event that has to be tightly controlled to ensure its viability. Genomes have evolved sophisticated mechanisms to control TE activity, the most important being epigenetic silencing. However, the epigenetic control of TEs can also affect genes located nearby that can become epigenetically regulated. It has been proposed that the combination of TE mobilization and the induced changes in the epigenetic landscape could...
Tipo: Text Palavras-chave: Transposable element; Epigenomics; Bioinformatic tools.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00487/59900/63082.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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Sympatric versus allopatric evolutionary contexts shape differential immune response in Biomphalaria / Schistosoma interaction ArchiMer
Portet, Anais; Pinaud, Silvain; Chaparro, Cristian; Galinier, Richard; Dheilly, Nolwenn M.; Portela, Julien; Charriere, Guillaume; Allienne, Jean-francois; Duval, David; Gourbal, Benjamin.
Selective pressures between hosts and their parasites can result in reciprocal evolution or adaptation of specific life history traits. Local adaptation of resident hosts and parasites should lead to increase parasite infectivity/virulence (higher compatibility) when infecting hosts from the same location (in sympatry) than from a foreign location (in allopatry). Analysis of geographic variations in compatibility phenotypes is the most common proxy used to infer local adaptation. However, in some cases, allopatric host-parasite systems demonstrate similar or greater compatibility than in sympatry. In such cases, the potential for local adaptation remains unclear. Here, we study the interaction between Schistosoma and its vector snail Biomphalaria in which...
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Ano: 2019 URL: https://archimer.ifremer.fr/doc/00488/59982/63214.pdf
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Terminal-Repeat Retrotransposons with GAG Domain in Plant Genomes: A New Testimony on the Complex World of Transposable Elements ArchiMer
Chaparro, Cristian; Gayraud, Thomas; De Souza, Rogerio Fernandes; Domingues, Douglas Silva; Akaffou, Selastique; Laforga Vanzela, Andre Luis; De Kochko, Alexandre; Rigoreau, Michel; Crouzillat, Dominique; Hamon, Serge; Hamon, Perla; Guyot, Romain.
A novel structure of nonautonomous long terminal repeat (LTR) retrotransposons called terminal repeat with GAG domain (TR-GAG) has been described in plants, both in monocotyledonous, dicotyledonous and basal angiosperm genomes. TR-GAGs are relatively short elements in length (<4 kb) showing the typical features of LTR-retrotransposons. However, they carry only one open reading frame coding for the GAG precursor protein involved for instance in transposition, the assembly, and the packaging of the element into the virus-like particle. GAG precursors show similarities with both Copia and Gypsy GAG proteins, suggesting evolutionary relationships of TR-GAG elements with both families. Despite the lack of the enzymatic machinery required for their mobility,...
Tipo: Text Palavras-chave: Nonautonomous elements; LTR-retrotransposons; GAG; Conservation in plant genomes.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00615/72715/71715.pdf
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The anti-fecundity effect of 5-azacytidine (5-AzaC) on Schistosoma mansoni is linked to dis-regulated transcription, translation and stem cell activities ArchiMer
Geyer, Kathrin K.; Munshi, Sabrina E.; Vickers, Martin; Squance, Michael; Wilkinson, Toby J.; Berrar, Daniel; Chaparro, Cristian; Swain, Martin T.; Hoffmann, Karl F..
Uncontrolled host immunological reactions directed against tissue-trapped eggs precipitate a potentially lethal, pathological cascade responsible for schistosomiasis. Blocking schistosome egg production, therefore, presents a strategy for simultaneously reducing immunopathology as well as limiting disease transmission in endemic or emerging areas. We recently demonstrated that the ribonucleoside analogue 5-azacytidine (5-AzaC) inhibited Schistosoma mansoni oviposition, egg maturation and ovarian development. While these anti-fecundity effects were associated with a loss of DNA methylation, other molecular processes affected by 5-AzaC were not examined at the time. By comparing the transcriptomes of 5-AzaC-treated females to controls, we provide evidence...
Tipo: Text Palavras-chave: Schistosoma mansoni; Epigenetics; 5-Azacytidine; Fecundity; RNA-Seq; Protein synthesis; Stem cells.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00615/72703/71747.pdf
Registros recuperados: 11
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