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| David, Elise; Boudry, Pierre; Degremont, Lionel; Tanguy, Amelie; Quere, N; Samain, Jean-francois; Moraga, D. |
| Large-scale mortality events have been observed in Pacific oyster Crassostrea gigas on the west coast of France since the early 1980s, particularly during summer. In order to understand the causes of this mortality, two generations of oysters from single-pair matings were studied in three sites on the French Atlantic coast (Baie-des-Veys, Auray and Ronce-les-Bains). The present paper examines the role of two candidate genes in the susceptibility of oysters to summer mortality, and the selective pressure exerted by such mortality on their polymorphism. Glutamine synthetase (amino-acid metabolism) and delta-9 desaturase (lipid metabolism) genes were studied in the successive generations, using polymerase chain reaction single-strand conformation polymorphism... |
| Tipo: Text |
Palavras-chave: SSCP; Mortality; Glutamine synthetase; Delta 9 desaturase; Crassostrea gigas. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-3040.pdf |
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| Bierne, Nicolas; Tanguy, A; Faure, Michel; Faure, B; David, E; Boutet, I; Boon, E; Quere, N; Plouviez, S; Kemppainen, P; Jollivet, D; Moraga, D; Boudry, Pierre; David, P. |
| We describe a simple protocol to reduce the number of cloning reactions of nuclear DNA sequences in population genetic studies of diploid organisms. Cloning is a necessary step to obtain correct haplotypes in such organisms, and, while traditional methods are efficient at cloning together many genes of a single individual, population geneticists rather need to clone the same locus in many individuals. Our method consists of marking individual sequences during the polymerase chain reaction (PCR) using 5'-tailed primers with small polynucleotide tags. PCR products are mixed together before the cloning reaction and clones are sequenced with universal plasmid primers. The individual from which a sequence comes from is identified by the tag sequences upstream... |
| Tipo: Text |
Palavras-chave: Sequence; Population genetics; High throughput allele recognition; DNA polymorphism. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-4222.pdf |
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| Moraga, D; Lucas, A. |
| The three populations studied were situated on the west coast of Brittany: to the North (Diben), to the West (Tinduff) to the South (Ile Tudy). 25 to 57 analysis were carried out on each of the 19 enzymatic systems where 27 loci had been recognized. Six of which were not interpreted, 10 were monomorphic, 11 polymorphic. Among these latter, the analysis of 4 of the loci were not used as the determination was too confused. Therefore, the comparison of the 3 populations was carried out on 7 polymorphic loci (EST3, HK2, LAP2, MDH1, MDH2, GPI, PGM2). Only a rare allele showed one qualitative difference; this coupled with slight quantitative differences in the distribution of the alleles did not permit to distinguish the three various populations. The genetic... |
| Tipo: Text |
Palavras-chave: ANE; France; Brittany Ruditapes decussatus Bivalvia Genetics Enzymes Biopolymorphism Bivalve Mollusque Heterozygotie Polymorphisme enzymatique. |
| Ano: 1983 |
URL: http://archimer.ifremer.fr/doc/1983/acte-1183.pdf |
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| Bierne, Nicolas; Boudry, Pierre; Lapegue, Sylvie; Bonhomme, Francois; Faure, M; Sauvage, Christopher; Moraga, D; Boutet, Isabelle; David, Elise; Jollivet, Didier; Tanguy, Arnaud; Faure, Baptiste; David, Patrice. |
| For a long time, population geneticists have had to content themselves with analysing neutral markers to infer selection processes indirectly. The recent improvement of sequencing tools now enables them to analyse the variations of a large number of genes and therefore to spot the genes, or the amino acids, which are under the direct influence of the selection (Yang & Bielawski, 2000). In order to analyse the selection processes acting on the mutations and discriminate the different factors acting on their evolution (genetic selection or drift), it is essential to compare polymorphism data between genomes of the same species/population and divergence data between species/populations (Kimura, 1983). Recently, polymorphism data has become available for a... |
| Tipo: Text |
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| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/rapport-6489.pdf |
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