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Outlier loci highlight the direction of introgression in oaks

hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorGUICHOUX, Erwan
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorGARNIER‐GÉRÉ, Pauline
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorLAGACHE, Lelia
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorLANG, Tiange
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorBOURY, Christophe
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorPETIT R.J., Remy
dc.date.issued2013
dc.identifier.issn0962-1083
dc.description.abstractEnLoci considered to be under selection are generally avoided in attempts to infer past demographic processes as they do not fit neutral model assumptions. However, opportunities to better reconstruct some aspects of past demography might thus be missed. Here we examined genetic differentiation between two sympatric European oak species with contrasting ecological dynamics (Quercus robur and Quercus petraea) with both outlier (i.e. loci possibly affected by divergent selection between species or by hitchhiking effects with genomic regions under selection) and nonoutlier loci. We sampled 855 individuals in six mixed forests in France and genotyped them with a set of 262 SNPs enriched with markers showing high interspecific differentiation, resulting in accurate species delimitation. We identified between 13 and 74 interspecific outlier loci, depending on the coalescent simulation models and parameters used. Greater genetic diversity was predicted in Q.petraea (a late-successional species) than in Q.robur (an early successional species) as introgression should theoretically occur predominantly from the resident species to the invading species. Remarkably, this prediction was verified with outlier loci but not with nonoutlier loci. We suggest that the lower effective interspecific gene flow at loci showing high interspecific divergence has better preserved the signal of past asymmetric introgression towards Q.petraea caused by the species' contrasting dynamics. Using markers under selection to reconstruct past demographic processes could therefore have broader potential than generally recognized.
dc.description.sponsorshipRelations entre diversité génétique et réponse écologique aux changements environementaux : les arbres forestiers comme modèles d'étude - ANR-08-BDVA-0006
dc.language.isoen
dc.publisherWiley
dc.subjectoutlier loci
dc.subjectQuercus petraea
dc.subjectQuercus robur
dc.subject.enasymmetric introgression
dc.subject.endivergent selection
dc.subject.engene flow barriers
dc.subject.engenetic assignment
dc.subject.ensingle nucleotide polymorphism
dc.title.enOutlier loci highlight the direction of introgression in oaks
dc.typeArticle de revue
dc.identifier.doi10.1111/mec.12125
dc.subject.halSciences du Vivant [q-bio]
bordeaux.journalMolecular Ecology
bordeaux.page450-62
bordeaux.volume22
bordeaux.issue2
bordeaux.peerReviewedoui
hal.identifierhal-02646008
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02646008v1
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