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Registros recuperados: 34
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A Functional Study of Transforming Growth Factor-Beta from the Gonad of Pacific Oyster Crassostrea gigas ArchiMer
Corporeau, Charlotte; Groisillier, Agnes; Jeudy, Alexandra; Barbeyron, Tristan; Fleury, Elodie; Fabioux, Caroline; Czjzek, Mirjam; Huvet, Arnaud.
The transforming growth factor (TGF)-beta superfamily is a group of important growth factors involved in multiple processes such as differentiation, cell proliferation, apoptosis and cellular growth. In the Pacific oyster Crassostrea gigas, the oyster gonadal (og) TGF-beta gene was recently characterized through genome-wide expression profiling of oyster lines selected to be resistant or susceptible to summer mortality. Og TGF-beta appeared specifically expressed in the gonad to reach a maximum when gonads are fully mature, which singularly contrasts with the pleiotropic roles commonly ascribed to most TGF-beta family members. The function of og TGF-beta protein in oysters is unknown, and defining its role remains challenging. In this study, we develop a...
Tipo: Text Palavras-chave: Transforming growth factor-beta; Bacterial expression; In vivo antibody inhibition; Reproduction; Crassostrea gigas; Marine bivalve.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00042/15371/13438.pdf
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Assessment of oocyte and trochophore quality in Pacific oyster, Crassostrea gigas ArchiMer
Boulais, Myrina; Corporeau, Charlotte; Huvet, Arnaud; Bernard, Ismael; Quere, Claudie; Quillien, Virgile; Fabioux, Caroline; Suquet, Marc.
Pacific oyster hatchery production remains highly variable, partially due to inconsistent gamete quality. However, little attention has been paid to oocyte quality in Pacific oyster compared to important vertebrate aquaculture species such as fishes. The aims of the present study were to identify criteria of oocyte and trochophore quality used as predictive tools for embryo developmental success at the D-larval stage. Twenty-six potential proxies of oocyte and trochophore quality were studied on 25 mature females, as determined using histology. Some morphological and biochemical characteristics of mature oocytes were described. Protein appeared to be the main constituent of fully mature Pacific oyster oocytes. Neutral lipids accounted for 61% of the total...
Tipo: Text Palavras-chave: Crassostrea gigas; Oocyte quality; Trochophore; Lipid; Gene expression; ATP.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00239/35010/33544.pdf
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Energy and Antioxidant Responses of Pacific Oyster Exposed to Trace Levels of Pesticides ArchiMer
Epelboin, Yanouk; Quere, Claudie; Pernet, Fabrice; Pichereau, Vianney; Corporeau, Charlotte.
Here, we assess the physiological effects induced by environmental concentrations of pesticides in Pacific oyster Crassostrea gigas. Oysters were exposed for 14 d to trace levels of metconazole (0.2 and 2 mu g/L), isoproturon (0.1 and 1 mu g/L), or both in a mixture (0.2 and 0.1 mu g/L, respectively). Exposure to trace levels of pesticides had no effect on the filtration rate, growth, and energy reserves of oysters. However, oysters exposed to metconazole and isoproturon showed an overactivation of the sensing-kinase AMP-activated protein kinase alpha (AMPK alpha), a key enzyme involved in energy metabolism and more particularly glycolysis. In the meantime, these exposed oysters showed a decrease in hexokinase and pyruvate kinase activities, whereas 2-DE...
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Ano: 2015 URL: http://archimer.ifremer.fr/doc/00284/39490/44227.pdf
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Episodes de mortalité massive de moules bleues observés en 2014 dans les Pertuis charentais ArchiMer
Bechemin, Christian; Soletchnik, Patrick; Polsenaere, Pierre; Le Moine, Olivier; Pernet, Fabrice; Protat, Martin; Fuhrmann, Marine; Quere, Claudie; Goulitquer, Sophie; Corporeau, Charlotte; Lapegue, Sylvie; Travers, Marie-agnes; Morga, Benjamin; Garrigues, Manon; Garcia, Celine; Haffner, Philippe; Dubreuil, Christine; Faury, Nicole; Baillon, Laury; Baud, Jean-pierre; Renault, Tristan.
Mass mortality outbreaks (90-100%) in both juvenile and adult blue mussels were reported in 2014 along the Pertuis Charentais area of the French Atlantic coast. A series of studies were carried out to learn more about the phenomenon through detecting pathogens, describing environmental conditions and establishing the physiological status of the animals. Bacteria identif ied as belonging to the V. splendidus species were detected in dying mussels and seem able to cause mortality in blue mussels in the laboratory. Unusual environmental conditions (large amounts of fresh water, re-suspension of sediments during a series of storms, and a high renewal rate of specific water masses in Brittany’s Pertuis area) may be partially responsible for sparking the phenomen
Tipo: Text Palavras-chave: Mortalités; Moules; Pertuis Charentais; Vibrio splendidus; Environnement; Mortality; Mussels; Pertuis Charentais; Vibrio splendidus; Environment.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00312/42343/41682.pdf
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Etude transcriptomique, génétique et fonctionnelle de la gamétogenèse chez l'huître creuse Crassostrea gigas ArchiMer
Bigot, L.; Dubos, M. P.; Dheilly, N.; Favrel, P.; Kellner, K.; Lelong, C.; Martinez, A. S.; Riviere, G.; Santerre, C.; Sourdaine, P.; Degremont, Lionel; Flahauw, Emilie; Hatt, Philippe-jacques; Heurtebise, Serge; Lapegue, Sylvie; Azzouzi, N.; Galibert, F.; Boudry, Pierre; Corporeau, Charlotte; Fabioux, Caroline; Guevelou, Eric; Huvet, Arnaud; Sussarellu, Rossana.
Le projet GAMETOGENES vise à améliorer les connaissances des bases physiologiques et génétiques de la reproduction et des métabolismes associés chez un mollusque d'importance économique l'huître creuse, Crassostrea gigas. Il a pour objectifs (1) la définition de marqueurs clés de la gamétogenèse, de l'investissement reproducteur et du déterminisme du sexe chez une espèce hermaphrodite à protandrie irrégulière (2) la recherche de QTL de survie aux mortalités estivales ou à l'effort de reproduction dont le succès repose sur l'augmentation de la densité de marqueurs sur les cartes génétiques existantes (SNP en particulier) et sur les liens qui pourront être établis entre ces cartes de liaison et une carte physique (3) le développement d'outils pour valider la...
Tipo: Text Palavras-chave: Génétique; Huître creuse; Crassostrea gigas; Gamétogenèse; QTL; Marqueur; Physiologie.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00107/21781/19355.pdf
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Exposure to chronic moderate hypoxia impacts physiological and developmental traits of European sea bass (Dicentrarchus labrax) larvae ArchiMer
Vanderplancke, Gwenaelle; Claireaux, Guy; Quazuguel, Patrick; Huelvan, Christine; Corporeau, Charlotte; Mazurais, David; Zambonino-infante, Jose-luis.
Since European sea bass (Dicentrarchus labrax) larvae occurred in coastal and estuarine waters at early life stages, they are likely to be exposed to reduced dissolved oxygen waters at a sensitive developmental stage. However, the effects of hypoxia at larval stage, which depend in part on fish species, remain very poorly documented in European sea bass. In the present study, the impacts of an experimental exposure to a chronic moderate hypoxia (40 % air saturation) between 30 and 38 days post-hatching on the physiological and developmental traits of European sea bass larvae were assessed. This study was based on the investigation of survival and growth rates, parameters related to energy metabolism [Citrate Synthase (CS) and Cytochrome-c Oxidase (COX)...
Tipo: Text Palavras-chave: Hypoxia; Fish larvae; Energy metabolism; Maturation.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00253/36433/35005.pdf
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FADS2: A potential limiting step in HUFA metabolic pathway of European sea bass (Dicentrarchus labrax) ArchiMer
Geay, E; Santigosa I Culi, E; Corporeau, Charlotte; Boudry, Pierre; Dreano, Y; Corcos, L; Bodin, Nathalie; Kaushik, Sadasivam; Vandeputte, Marc; Zambonino, Jose-luis; Mazurais, David; Cahu, Chantal.
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Ano: 2010
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Generation and analysis of a 29,745 unique Expressed Sequence Tags from the Pacific oyster (Crassostrea gigas) assembled into a publicly accessible database: the GigasDatabase ArchiMer
Fleury, Elodie; Huvet, Arnaud; Lelong, Christophe; De Lorgeril, Julien; Boulo, Viviane; Gueguen, Yannick; Bachere, Evelyne; Tanguy, Arnaud; Moraga, Dario; Fabioux, Caroline; Lindeque, Penelope; Shaw, Jenny; Reinhardt, Richard; Prunet, Patrick; Davey, Grace; Lapegue, Sylvie; Sauvage, Christopher; Corporeau, Charlotte; Moal, Jeanne; Gavory, Frederick; Wincker, Patrick; Moreews, Francois; Klopp, Christophe; Mathieu, Michel; Boudry, Pierre; Favrel, Pascal.
Background: Although bivalves are among the most-studied marine organisms because of their ecological role and economic importance, very little information is available on the genome sequences of oyster species. This report documents three large-scale cDNA sequencing projects for the Pacific oyster Crassostrea gigas initiated to provide a large number of expressed sequence tags that were subsequently compiled in a publicly accessible database. This resource allowed for the identification of a large number of transcripts and provides valuable information for ongoing investigations of tissue-specific and stimulus-dependant gene expression patterns. These data are crucial for constructing comprehensive DNA microarrays, identifying single nucleotide...
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Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6770.pdf
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Identification of Hypoxia-Regulated Genes in the Liver of Common Sole (Solea solea ) Fed Different Dietary Lipid Contents ArchiMer
Mazurais, David; Ferraresso, Serena; Gatta, Pier Paolo; Desbruyeres, Elisabeth; Severe, Armelle; Corporeau, Charlotte; Claireaux, Guy; Bargelloni, Luca; Zambonino, Jose-luis.
Coastal systems could be affected by hypoxic events brought about by global change. These areas are essential nursery habitats for several fish species including the common sole (Solea solea L.). Tolerance of fish to hypoxia depends on species and also on their physiological condition and nutritional status. Indeed, high dietary lipid content has been recently shown to negatively impact the resistance of sole to a severe hypoxic challenge. In order to study the molecular mechanisms involved in the early response to hypoxic stress, the present work examined the hepatic transcriptome in common sole fed diets with low and high lipid content, exposed to severe hypoxia. The activity of AMP-activated protein kinase (AMPK) was also investigated through the...
Tipo: Text Palavras-chave: Fish; Hypoxia; Nutrition; Liver; Transcriptome; AMPK.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00169/28062/26474.pdf
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In vivo RNA interference in oyster -vasa silencing inhibits germ cell development ArchiMer
Fabioux, Caroline; Corporeau, Charlotte; Quillien, Virgile; Favrel, Pascal; Huvet, Arnaud.
This study investigated the potential of RNA interference, which is technically challenging in bivalve mollusc species, to assess gene function in the oyster Crassostrea gigas. We designed dsRNA targeting the oyster vasa-like gene (Oyvlg), specifically expressed in oyster germ cells. In vivo injection of oyvl-dsRNA into the gonad provokes a knockdown phenotype corresponding to germ cell underproliferation and prematurely arrested meiosis througout the organ. The most severe phenotype observed is sterile. This knockdown phenotype is associated with a decrease in Oyvlg mRNA level of between 39% and 87%, and a strong reduction in OYVLG protein, to an undetectable level. Therefore, Oyvlg appears to be essential for germ cell development in Crassostrea gigas,...
Tipo: Text Palavras-chave: Vasa; RNAi; Marine bivalve; Germline; Crassostrea gigas.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6641.pdf
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In Vivo RNA Interference of a Gonad-Specific Transforming Growth Factor-beta in the Pacific Oyster Crassostrea gigas ArchiMer
Huvet, Arnaud; Fleury, Elodie; Corporeau, Charlotte; Quillien, Virgile; Daniel, Jean-yves; Riviere, Guillaume; Boudry, Pierre; Fabioux, Caroline.
We investigated the role of oyster gonadal TGF beta (og-TGF beta) in the reproduction of Crassostrea gigas, using an in vivo RNA interference approach. We designed double-stranded RNA targeting og-TGF beta, which is specifically expressed in the somatic cells surrounding germ cells in the gonad of both male and female oysters. In vivo injection of this og-TGF beta dsRNA into the gonad led to knock-down phenotypes for both sexes, with significant reduction (77.52% relative to controls) of the gonad area, lowered reproductive effort and germ cell under-proliferation. Interestingly, half of the injected females halted their vitellogenesis, since we were only able to observe pre-vitellogenic oocytes. In addition, apoptotic germ cells and haemocytes infiltrated...
Tipo: Text Palavras-chave: Marine bivalve; Crassostrea gigas; Reproduction; RNA interference; Transforming growth factor-beta.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00087/19794/17486.pdf
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L’huître creuse, sentinelle de l’état de santé des écosystèmes côtiers exploités du littoral français. Rapport annuel ECOSCOPA 2016 ArchiMer
Fleury, Elodie; Corporeau, Charlotte; Pouvreau, Stephane.
Occupant une place de premier ordre dans nos paysages côtiers, l’ostréiculture est le premier contributeur de la filière aquacole française avec une production estimée à 85 000 tonnes ces dernières années. Véritable espèce ingénieur, l’huître creuse joue aussi un rôle essentiel sur le plan écologique dans les écosystèmes qui l’abritent. Pourtant, depuis plusieurs années, l’ostréiculture subie une baisse de production et les bancs naturels, garants de la diversité génétique, sont mis en danger. Ces phénomènes sont la conséquence directe de l’épizootie causée par OsHV-1 µVar frappant les naissains et des mortalités d’adultes associées à la bactérie Vibrio aestuarianus. Ces épisodes de mortalités accrues ne sont pas nouveaux mais leur récurrence et leur...
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Ano: 2017 URL: http://archimer.ifremer.fr/doc/00433/54425/55774.pdf
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Mass mortalities of Pacific oysters Crassostrea gigas reflect infectious diseases and vary with farming practices in the Mediterranean Thau lagoon, France ArchiMer
Pernet, Fabrice; Barret, Jean; Le Gall, Patrik; Corporeau, Charlotte; Degremont, Lionel; Lagarde, Franck; Pepin, Jean-francois; Keck, Nicolas.
Experiments were conducted to investigate the effects of farming sites, seeding date, age of oysters, ploidy level and rearing structures on mortality, pathogens and energetic reserves of oysters Crassostrea gigas. Mortality of oysters coincided with infections involving, primarily, the ostreid herpesvirus OsHV-1 and, secondarily, bacteria of the group Vibrio splendidus, when seawater temperature was between 17 and 24°C. Mortality started in early May and lasted until late September, with an interruption in July and August when seawater temperatures rose above 24°C. Mortality varied with farming site: oysters maintained in the open Mediterranean Sea showed no mortality and OsHV-1 was occasionally detected at a low level only, while oysters maintained in...
Tipo: Text Palavras-chave: Pacific oyster; Mortality; Disease; Farming practices; Hydrodynamics; Energetic.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00086/19739/17379.pdf
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Metabolic responses of clam Ruditapes philippinarum exposed to its pathogen Vibrio tapetis in relation to diet ArchiMer
Richard, Gaelle; Guerard, Fabienne; Corporeau, Charlotte; Lambert, Christophe; Paillard, Christine; Pernet, Fabrice.
We investigated the effect of brown ring disease (BRD)1 development and algal diet on energy reserves and activity of enzymes related to energy metabolism, antioxidant system and immunity in Manila clam, Ruditapes philippinarum. We found that algal diet did not impact the metabolic response of clams exposed to Vibrio tapetis. At two days post-injection (dpi), activities of superoxide dismutase and glutathione peroxidase (GPx) decreased whereas activities of nitric oxide synthase (iNOS) and catalase increased in infected clams, although no clinical signs were visible (BRD-). At 7 dpi, activities of several antioxidant and immune-related enzymes were markedly increased in BRD-likely indicating an efficient reactive oxygen species (ROS) scavenging compared to...
Tipo: Text Palavras-chave: Antioxidant enzymes; Immunity; Energetic metabolism; Ruditapes philippinarum; Vibrio tapetis.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00316/42684/42057.pdf
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Metabolism of the Pacific oyster, Crassostrea gigas , is influenced by salinity and modulates survival to the Ostreid herpesvirus OsHV-1 ArchiMer
Fuhrmann, Marine; Delisle, Lizenn; Petton, Bruno; Corporeau, Charlotte; Pernet, Fabrice.
The Pacific oyster, Crassostrea gigas, is an osmoconforming bivalve exposed to wide salinity fluctuations. The physiological mechanisms used by oysters to cope with salinity stress are energy demanding and may impair other processes, such as defense against pathogens. This oyster species has been experiencing recurrent mortality events caused by the Ostreid herpesvirus 1 (OsHV-1). The objectives of this study were to investigate the effect of salinity (10, 15, 25 and 35‰) on energetic reserves, key enzyme activities and membrane fatty acids, and to identify the metabolic risk factors related to OsHV-1-induced mortality of oysters. Acclimation to low salinity led to increased water content, protein level, and energetic reserves (carbohydrates and...
Tipo: Text Palavras-chave: Bivalve; Disease; Environment; Metabolism; Mortality risk; Salinity.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00427/53886/54958.pdf
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Microarray-Based Identification of Gonad Transcripts Differentially Expressed Between Lines of Pacific Oyster Selected to Be Resistant or Susceptible to Summer Mortality ArchiMer
Fleury, Elodie; Moal, Jeanne; Boulo, Viviane; Daniel, Jean-yves; Mazurais, David; Henaut, Alain; Corporeau, Charlotte; Boudry, Pierre; Favrel, Pascal; Huvet, Arnaud.
Summer mortality of the Pacific oyster Crassostrea gigas is the result of a complex interaction between oysters, their environment, and pathogens. Heredity appears to be a major factor determining the sensitivity of oysters to summer mortality, allowing resistant (R) and susceptible (S) lines to be produced. We conducted genome-wide expression profiling of R and S gonads during the 3-month period preceding a summer mortality event, using a cDNA microarray that we designed. ANOVA analysis revealed that 34 genes were differentially expressed between R and S lines on four dates preceding the mortality event. Annotation of some of these genes highlights reproduction and its allocation and antioxidant defenses as the main pathways that operate differentially...
Tipo: Text Palavras-chave: Mollusca; Bivalvia; Gene expression; CDNA microarrays; Reproduction; Oxidative stress; Energy metabolism.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00005/11590/8258.pdf
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Mortalité du naissain d’Huître creuse Crassostrea gigas dans l’étang de Thau en 2009 ArchiMer
Pernet, Fabrice; Barret, Jean; Le Gall, Patrik; Malet, Nathalie; Pastoureaud, Annie; Munaron, Dominique; De Lorgeril, Julien; Bachere, Evelyne; Vaquer, Andre; Huvet, Arnaud; Corporeau, Charlotte; Normand, Julien; Boudry, Pierre; Moal, Jeanne; Quere, Claudie; Quilien, Virgile; Daniel, Jean-yves; Pepin, Jean-francois; Saulnier, Denis; Gonzalez, Jean-louis.
This study was conducted in the Mediterranean area during a mass mortality event of Pacific oyster Crassostrea gigas. The objectives of this work were to increase our understanding of the mass mortality phenomena in Pacific oysters, to identify risky cultivation practises and to propose mitigation strategies. In the first part of this work, we followed environmental parameters of the Thau lagoon in relation with mortality events. Then, we compared mortality and growth parameters of oysters as a function of their origins, their development stages and cultivation sites in relation with energetic, reproduction and pathogens. Finally, we conducted transfer experiments where oysters maintained free of mortality in open sea were transferred in the Thau lagoon...
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Ano: 2010 URL: http://archimer.ifremer.fr/doc/00002/11354/7927.pdf
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Mortalités massives de l’Huître creuse: causes et perspectives ArchiMer
Pernet, Fabrice; Barret, Jean; Le Gall, Patrik; Lagarde, Franck; Fiandrino, Annie; Huvet, Arnaud; Corporeau, Charlotte; Boudry, Pierre; Quere, Claudie; Degremont, Lionel; Pepin, Jean-francois; Saulnier, Denis; Boulet, Hélène; Keck, Nicolas.
The objectives of this study are to increase our understanding of the mass mortality phenomena in Pacific oysters Crassostrea gigas in the Thau lagoon and to examine the effect of cultivation practises. Mortality events in 2009 and 2010 always coincide with simple or dual infections involving primarily the Herpes virus OsHV-I and secondarily the bacteria Vibrio splendidus, when seawater temperature is between 17°C and 24°C. In the Thau lagoon, mortality starts early May and last until fall with an interruption period when seawater temperature is higher than 24°C in July and August. Mortality of oysters varies as a function of zootechnical life-history, hydrodynamics and cultivation practises. First, mortality depends on whether or not oysters have been...
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Ano: 2011 URL: http://archimer.ifremer.fr/doc/00043/15404/12764.pdf
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Non-additive effects of ocean acidification in combination with warming on the larval proteome of the Pacific oyster, Crassostrea gigas ArchiMer
Harney, Ewan; Artigaud, Sebastien; Le Souchu, Pierrick; Miner, Philippe; Corporeau, Charlotte; Essid, Hafida; Pichereau, Vianney; Nunes, Flavia.
Increasing atmospheric carbon dioxide results in ocean acidification and warming, significantly impacting marine invertebrate larvae development. We investigated how ocean acidification in combination with warming affected D-veliger larvae of the Pacific oyster Crassostrea gigas. Larvae were reared for 40 h under either control (pH 8.1, 20 °C), acidified (pH 7.9, 20 °C), warm (pH 8.1, 22 °C) or warm acidified (pH 7.9, 20 °C) conditions. Larvae in acidified conditions were significantly smaller than in the control, but warm acidified conditions mitigated negative effects on size, and increased calcification. A proteomic approach employing two-dimensional electrophoresis (2-DE) was used to quantify proteins and relate their abundance to phenotypic traits. In...
Tipo: Text Palavras-chave: Crassostrea gigas; Ocean acidification; Larval development; ATP synthase; GAPDH; Superoxide dismutase.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00299/40985/40076.pdf
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NPY signalling in the gonad of the oyster Crassostrea gigas : involvement in summer mortality? ArchiMer
Corporeau, Charlotte; Fleury, Elodie; Moal, Jeanne; Boudry, Pierre; Favrel, Pascal; Huvet, Arnaud.
In summer, oysters suffer mortality that decimates this year about 60% of the population in France. We previously demonstrated a genetic basis for summer survival thatallowed us to produce resistant (R) and susceptible (S) oyster familiesby divergent selection (Samainet al., 2007). At the physiological level, R families can survive summer mortality because they are reproductively less active than S families (Fleury et al., 2008).In order to identify the molecular basis of the summer survival,a transcriptomicapproach on R and S families was performed using microarray analysis and 34 differentially-expressed genes were identified between R and S in the gonad (Fleury et al., in prep). Among these genes, we found an EST encoding a neuropeptide Y related...
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Ano: 2008 URL: http://archimer.ifremer.fr/doc/00083/19424/17035.pdf
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