Genetic characterization of cupped oyster resources in Europe using informative single nucleotide polymorphism (SNP) panels

• Published in: Genes
• Main Authors: Lapègue, Sylvie, Heurtebise, Serge, Cornette, Florence, Guichoux, Erwan, Gagnaire, Pierre-Alexandre
• Other Authors: Unité Santé, Génétique et Microbiologie des Mollusques (SGMM), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Biodiversité, Gènes & Communautés (BioGeCo), Université de Bordeaux (UB)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Institut des Sciences de l'Evolution de Montpellier (UMR ISEM), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-École Pratique des Hautes Études (EPHE), Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Montpellier (UM)-Institut de recherche pour le développement IRD : UR226-Centre National de la Recherche Scientifique (CNRS), ANR-12-BSV7-0011,HYSEA,L'hybridation, un processus clé mais négligé de la dynamique de la biodiversité marine(2012), ANR-10-EQPX-0016,XYLOFOREST,Plateforme d'Innovation " Forêt-Bois-Fibre-Biomasse du Futur "(2010)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2020
• Subjects: cupped oysters; population genetics; introgression; conservation; shellfisheries; [SDV.GEN.GPO]Life Sciences [q-bio]/Genetics/Populations and Evolution [q-bio.PE]; Crassostrea gigas; Pacific oyster
• Online Access: https://hal.science/hal-03065752; https://hal.science/hal-03065752/document; https://hal.science/hal-03065752/file/Lap%C3%A8gue,%20Genes,%202020.%20Genetic%20characterization%20of%20cupped%20oyster%20resources%20in%20Europe%20uing%20informative%20SNPs.pdf; https://doi.org/10.3390/genes11040451

International audience The Pacific oyster, Crassostrea gigas, was voluntarily introduced from Japan and British Columbia into Europe in the early 1970s, mainly to replace the Portuguese oyster, Crassostrea angulata, in the French shellfish industry, following a severe disease outbreak. Since then, the two species have been in contact in southern Europe and, therefore, have the potential to exchange genes. Recent evolutionary genomic works have provided empirical evidence that C. gigas and C. angulata exhibit partial reproductive isolation. Although hybridization occurs in nature, the rate of interspecific gene flow varies across the genome, resulting in highly heterogeneous genome divergence. Taking this biological property into account is important to characterize genetic ancestry and population structure in oysters. Here, we identified a subset of ancestry-informative makers from the most differentiated regions of the genome using existing genomic resources. We developed two different panels in order to (i) easily differentiate C. gigas and C. angulata, and (ii) describe the genetic diversity and structure of the cupped oyster with a particular focus on French Atlantic populations. Our results confirm high genetic homogeneity among Pacific cupped oyster populations in France and reveal several cases of introgressions between Portuguese and Japanese oysters in France and Portugal.