Evolution of the polymorphism at molecular markers in QTL and non-QTL regions in selected chicken lines (Open Access publication)

Genetics Selection Evolution

Piter Bijma³  Étienne Verrier²  Frédérique Pitel¹  Marie-Hélène Pinard-van der Laan²  Bertrand Bed'hom²  Valérie Loywyck² 

[1] Génétique Cellulaire UR444, INRA, 31326 Castanet-Tolosan, France;Génétique et Diversité Animales UMR1236, INRA/AgroParisTech, 78352 Jouy-en-Josas, France;Animal Breeding and Genomics Group, Wageningen University, 6700 AH Wageningen, The Netherlands

关键词: genetic diversity;    chicken;    hitchhiking;    quantitative trait loci;    selection;   

Others  :  1093800
DOI  :  10.1186/1297-9686-40-6-639

 received in 2007-10-22, accepted in 2008-06-18,  发布年份 2008

【 摘 要 】

We investigated the joint evolution of neutral and selected genomic regions in three chicken lines selected for immune response and in one control line. We compared the evolution of polymorphism of 21 supposedly neutral microsatellite markers versus 30 microsatellite markers located in seven quantitative trait loci (QTL) regions. Divergence of lines was observed by factor analysis. Five supposedly neutral markers and 12 markers in theQTL regions showed F_st values greater than 0.15. However, the non-significant difference (P > 0.05) between matrices of genetic distances based on genotypes at supposedly neutral markers on the one hand, and at markers in QTL regions, on the other hand, showed that none of the markers in the QTL regions were influenced by selection. A supposedly neutral marker and a marker located in the QTL region on chromosome 14 showed temporal variations in allele frequencies that could not be explained by drift only. Finally, to confirm thatmarkers located inQTL regions on chromosomes 1, 7 and 14were under the influence of selection, simulations were performed using haplotype dropping along the existing pedigree. In the zone located on chromosome 14, the simulation results confirmed that selection had an effect on the evolution of polymorphism of markers within the zone.

【 授权许可】

   
2008 INRA, EDP Sciences