Genome variability in European and American bison detected using the BovineSNP50 BeadChip

Abstract

The remaining wild populations of bison have all been through severe bottlenecks. The genomic consequences of these bottlenecks present an interesting area to study. Using a very large panel of SNPs developed in Bos taurus we have carried out a genome-wide screening on the European bison (Bison bonasus; EB) and on two subspecies of American bison: the plains bison (B. bison bison; PB) and the wood bison (B. bison athabascae; WB). One hundred bison samples were genotyped for 52,978 SNPs along with seven breeds of domestic bovine Bos taurus. Only 2,209 of the SNPs were polymorphic in the bison when EB, PB and WB were pooled and only 929 SNPs were polymorphic in EB. Larger numbers of polymorphic SNPs were found in PB (1,403 SNPs) and WB (1,524 SNPs). Also the expected heterozygosity was lower in EB (HE = 0.135) than in WB (HE = 0.197) and PB (HE = 0.199). The polymorphic SNPs were not randomly distributed in the bison, but were aggregated and separated from each other by regions with low haplotype diversity (haplotype blocks). Based on our results we suggest that the utilization of genome-wide screening technologies holds large potential to radically change the breeding practices in captive or managed populations of threatened populations and advocate for developing marker assisted selected strategies in such populations.