A genome-wide association study of osteochondritis dissecans in the Thoroughbred

Laura J Corbin, Sarah C Blott, June E Swinburne, Charlene Sibbons, Laura Y Fox-Clipsham, Maud Helwegen, Tim D H Parkin, J Richard Newton, Lawrence R Bramlage, C Wayne McIlwraith, Stephen C Bishop, John A Woolliams, Mark Vaudin

Research output: Contribution to journalArticle (Academic Journal)peer-review

35 Citations (Scopus)
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Osteochondrosis is a developmental orthopaedic disease that occurs in horses, other livestock species, companion animal species, and humans. The principal aim of this study was to identify quantitative trait loci (QTL) associated with osteochondritis dissecans (OCD) in the Thoroughbred using a genome-wide association study. A secondary objective was to test the effect of previously identified QTL in the current population. Over 300 horses, classified as cases or controls according to clinical findings, were genotyped for the Illumina Equine SNP50 BeadChip. An animal model was first implemented in order to adjust each horse's phenotypic status for average relatedness among horses and other potentially confounding factors which were present in the data. The genome-wide association test was then conducted on the residuals from the animal model. A single SNP on chromosome 3 was found to be associated with OCD at a genome-wide level of significance, as determined by permutation. According to the current sequence annotation, the SNP is located in an intergenic region of the genome. The effects of 24 SNPs, representing QTL previously identified in a sample of Hanoverian Warmblood horses, were tested directly in the animal model. When fitted alongside the significant SNP on ECA3, two of these SNPs were found to be associated with OCD. Confirmation of the putative QTL identified on ECA3 requires validation in an independent sample. The results of this study suggest that a significant challenge faced by equine researchers is the generation of sufficiently large data sets to effectively study complex diseases such as osteochondrosis.

Original languageEnglish
Pages (from-to)294-303
Number of pages10
JournalMammalian Genome
Issue number3-4
Early online date4 Nov 2011
Publication statusPublished - Apr 2012


  • Animals
  • Female
  • Genome-Wide Association Study
  • Horse Diseases
  • Horses
  • Male
  • Osteochondritis Dissecans
  • Polymorphism, Single Nucleotide
  • Quantitative Trait Loci


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