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| Registros recuperados: 48 | |
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| Gerard, Andre; Naciri, Yamama; Peignon, Jean-marie; Ledu, Christophe; Phelipot, Pascal; Baud, Jean-pierre; Nourry, Max; Haure, Joel; Coatanea, Denis; Oheix, Jocelyne; Vercelli, Catherine; Chabirand, Jean-michel; Borel, Michel; Maurer, Daniele; Heurtebise, Serge; Garnier, Jacqueline; Martin, Anne-genevieve; Tige, Gilbert; Mazurie, Joseph; Langlade, Aime. |
| Cette réunion des membres du Réseau Génétique Mollusques avait pour objet de faire un bilan provisoire des actions en cours et surtout de mettre en place les protocoles et les calendriers du début de l'année 1994. La première demi-journée a été réservée à un exposé de Yamama NACIRI sur les bases de la Génétique Quantitative et ses applications dans le cadre des programmes de sélection des mollusques.La deuxième demi-journée a été consacrée au bilan des actions de 1993. Les représentants de chaque site, intervenant dans une opération du réseau en 1993, ont fait une présentation orale de leurs résultats. Un résumé de chaque intervention vous est fourni dans ce document. Il est important de souligner que tous ces bilans sont provisoires, en premier lieu parce... |
| Tipo: Text |
Palavras-chave: Génétique; Sélection génétique; Huître plate; Ostrea edulis; Croissance; Génétique population. |
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/00049/15982/13425.pdf |
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| Boudry, Pierre; Launey, Sophie; Diaz-almela, A.; Naciri-graven, Yamama; Ledu, Christophe; Mira, S.; Taris, Nicolas; Bonhomme, Francois; Lapegue, Sylvie. |
| PCR-based DNA markers enable the study of diversity and differentiation of marine organisms at different stages of their life cycle. Our study of European fiat oyster (Ostrea edulis) populations aimed to describe their spatial and temporal dynamics. First, we analyzed adults sampled over the natural range of the species. An Atlantic/Mediterranean differentiation pattern was observed. Similar patterns of variation were found using allozymes, microsatellites and mitochondrial DNA, aIl which support an isolation by distance model. High variability was observed in the range of diversity between populations using a mitochondrial marker, a reflection of small effective population sizes in sorne locations. A 10fold quantitative difference was observed in Fst,... |
| Tipo: Text |
Palavras-chave: Recruitment; Diversity; Molecular markers; Population genetics; Ostrea edulis; Flat oyster; Dynamique de recrutement; Diversité génétique; Microsatellites; Marqueurs moléculaires; Génétique des populations; Ostrea edulis; Huître plate. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/2003/acte-2851.pdf |
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| Benabdelmouna, Abdellah; Saunier, Alice; Ledu, Christophe; Travers, Marie-agnes; Morga, Benjamin. |
| In the context of the abnormal mass mortality of mussels in France since 2014, Flow CytoMetry (FCM) was used in 2015 and 2016 to study the DNA content and cell cycle characteristics of hemic circulating cells collected from 2000 mussels. The mussels were sampled from 12 wild and cultivated blue mussels stocks distributed along the French Atlantic coast from the south Brittany to Pertuis Charentais areas. During these surveys, various genetic abnormalities were frequently detected, and ploidy characteristics revealed contrasting profiles that corresponded to respective contrasting sanitary status, i.e. healthy mussels with high cytogenetic quality (HCQ) versus diseased mussels with low cytogenetic quality (LCQ). In the present work, FCM and hemocytology... |
| Tipo: Text |
Palavras-chave: Mussels; Hemocytes; Flow cytometry; Hemocytology; Cytogenetic quality; Neoplasia. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00455/56623/58443.pdf |
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| Mccombie, Helen; Lapegue, Sylvie; Cornette, Florence; Ledu, Christophe; Boudry, Pierre. |
| Alterations of chromosome number have been observed in the somatic tissue of Crassostrea gigas diploids and artificial polyploids bred in this species. Tetraploid animals with lower chromosome counts in some or all of their somatic tissue are considered undesirable as parents either for commercial triploids (produced via a cross with diploids) or for tetraploid breeding because (1) they may confer the tendency to lose chromosomes and revert to lower ploidy levels to their offspring or (2) their offspring could have a lower ploidy directly because of potential links between somatic and gametic chromosome loss. The present study evaluated the phenomenon in bi-parental tetraploid families bred from parents of differing ploidy quality, including a... |
| Tipo: Text |
Palavras-chave: Tetraploid; Chromosome; Genetic; Crassostrea gigas; Oyster. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/2003/acte-3435.pdf |
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| Gerard, Andre; Naciri-graven, Yamama; Boudry, Pierre; Launey, Sophie; Heurtebise, Serge; Ledu, Christophe; Phelipot, Pascal. |
| At the end of the 1980s, after two decades of aquaculture research in molluscs, Ifremer initiated its first genetic studies. These new studies quickly revealed the limits of knowledge in aquaculture, particularly in terms of controlling oyster reproduction. This presentation attempts to summarize the available information on genetics in aquaculture. In particular, breeding practices in the 1980s involved populations of broodstock, while genetics requires modern techniques where individuals, not just populations, can be identified. Controlling reproduction at the individual level in oysters raises new questions that existing protocols cannot address, especially in terms of controlling sex determination, individual maturity, spawning synchrony, chemical... |
| Tipo: Text |
Palavras-chave: Gamètes; Fécondation; Induction ponte; Reproducteur; Conditionnement; Gamétogénèse; Génétique; Reproduction; Crassostrea gigas; Huîtres. |
| Ano: 1995 |
URL: http://archimer.ifremer.fr/doc/1995/acte-3210.pdf |
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| Boudry, Pierre; Huvet, Arnaud; Fabioux, Caroline; Lapegue, Sylvie; Heurtebise, Serge; Ledu, Christophe; Blouin, Frederic; Phelipot, Pascal; Gerard, Andre. |
| L'étude de la variabilité génétique de l' huître creuse Crassastrea gigas est un point essentiel dans la mise en place de programmes de gestion des ressources génétiques et de sélection chez cette espèce. C. gigas, originaire du Japon, a été introduite dans de nombreuses régions du monde et représente aujourd'hui plus de 95 % de la production mondiale d' huîtres. Introduite en France au début des années 1970 pour remplacer l' huître portugaise Crassostrea angulata, c'est aujourd 'hui une ressource de première importance pour notre région. Malgré la maîtrise du cycle de reproduction de l'espèce et son importance commerciale, elle n' a pas été génétiquement améliorée et on peut donc considérer les stocks comme « sauvages» ou « non domestiqués ». De plus, la... |
| Tipo: Text |
Palavras-chave: Génétique; Ressources génétiques; Différenciation génétique; Hybridation; Anomalies chromosomiques; Huîtres creuses; Crassostrea gigas; Crassostrea angulata. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/00044/15564/12955.pdf |
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| Benabdelmouna, Abdellah; Ledu, Christophe. |
| Since 2014, blue mussel industry in France has been facing heavy mortality outbreaks (90–100%) affecting both juveniles and adults. This report presents evidence of heavy genomic abnormalities associated with mortality outbreaks in blue mussels from the Atlantic coast of France. Ploidy characteristics of hemic cells were investigated using Flow CytoMetry (FCM), revealing an unusual, broad continuum of ploidy distribution from hypodiploidy to tetraploidy. FCM was additionally used to evaluate, at individual and populations levels, different thresholds of genomic abnormality (GA%)using the percentage of non-diploid nuclei. Individual mussels were considered to be abnormal when more than 10% of hemocytes in S–G2/M phase were present. At the population level,... |
| Tipo: Text |
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| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00356/46720/46591.pdf |
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| Registros recuperados: 48 | |
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