Design of a bovine low-density SNP array optimized for imputation

Didier Boichard (1) , Hoyoung Chung (2, 3) , Romain Dassonneville (1) , Xavier David , Andre Eggen (1) , Sebastien Fritz (1) , Kimberly J. Gietzen , Ben J. Hayes (4) , Cynthia T. Lawley , Tad S. Sonstegard (3) , Curtis P. van Tassell (3) , Paul M. Vanraden (5) , Karine A. Viaud-Martinez , George R. Wiggans (5)

1 GABI - Génétique Animale et Biologie Intégrative
2 Animal Genetic Improvement Division
3 Bovine Functional Genomics Laboratory, Agricultural Research Service
4 Biosciences Research Division
5 Animal Improvement Programs Laboratory, Agricultural Research Service

The Illumina BovineLD BeadChip was designed to support imputation to higher density genotypes in dairy and beef breeds by including single-nucleotide polymorphisms (SNPs) that had a high minor allele frequency as well as uniform spacing across the genome except at the ends of the chromosome where densities were increased. The chip also includes SNPs on the Y chromosome and mitochondrial DNA loci that are useful for determining subspecies classification and certain paternal and maternal breed lineages. The total number of SNPs was 6,909. Accuracy of imputation to Illumina BovineSNP50 genotypes using the BovineLD chip was over 97% for most dairy and beef populations. The BovineLD imputations were about 3 percentage points more accurate than those from the Illumina GoldenGate Bovine3K BeadChip across multiple populations. The improvement was greatest when neither parent was genotyped. The minor allele frequencies were similar across taurine beef and dairy breeds as was the proportion of SNPs that were polymorphic. The new BovineLD chip should facilitate low-cost genomic selection in taurine beef and dairy cattle.

Mots clés: genotype; snps; beef breed; dairy breed; illumina bovineld beadchip

Domaines: Sciences agricoles

Didier Boichard, Hoyoung Chung, Romain Dassonneville, Xavier David, Andre Eggen, et al.. Design of a bovine low-density SNP array optimized for imputation. PLoS ONE, 2012, 7, online (3), Non paginé. ⟨10.1371/journal.pone.0034130⟩. ⟨hal-01019774⟩