NDLI: Genome-wide association analysis of osteochondrosis of the tibiotarsal joint in Norwegian Standardbred trotters

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Genome-wide association analysis of osteochondrosis of the tibiotarsal joint in Norwegian Standardbred trotters

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Genome-wide association analysis of osteochondrosis of the tibiotarsal joint in Norwegian Standardbred trotters

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Lykkjen, S. Dolvik, N. I. McCue, M. E. Rendahl, A. K. Mickelson, J. R. Roed, K. H.
Description	Country affiliation: Norway Author Affiliation: Lykkjen S ( The Norwegian School of Veterinary Science, Department of Basic Sciences and Aquatic Medicine, Post-box 8146 Dep., N-0033 Oslo, Norway. sigrid.lykkjen@nvh.no)
Abstract	Osteochondrosis (OC), a disturbance in the process of endochondral ossification, is by far the most important equine developmental orthopaedic disease and is also common in other domestic animals and humans. The purpose of this study was to identify quantitative trait loci (QTL) associated with osteochondrosis dissecans (OCD) at the intermediate ridge of the distal tibia in Norwegian Standardbred (SB) using the Illumina Equine SNP50 BeadChip whole-genome single-nucleotide polymorphism (SNP) assay. Radiographic data and blood samples were obtained from 464 SB yearlings. Based on the radiographic examination, 162 horses were selected for genotyping; 80 of these were cases with an OCD at the intermediate ridge of the distal tibia, and 82 were controls without any developmental lesions in the joints examined. Genotyped horses descended from 22 sires, and the number of horses in each half-sib group ranged from 3 to 14. The population structure necessitated statistical correction for stratification. When conducting a case-control genome-wide association study (GWAS), mixed-model analyses displayed regions on chromosomes (Equus callabus chromosome - ECA) 5, 10, 27 and 28 that showed moderate evidence of association (P ≤ 5 × 10(-5); this P-value is uncorrected i.e. not adjusted for multiple comparisons) with OCD in the tibiotarsal joint. Two SNPs on ECA10 represent the most significant hits (uncorrected P=1.19 × 10(-5) in the mixed-model). In the basic association (chi-square) test, these SNPs achieved statistical significance with the Bonferroni correction (P=0.038) and were close in the permuted logistic regression test (P=0.054). Putative QTL on ECA 5, 10, 27 and 28 represent interesting areas for future research, validation studies and fine mapping of candidate regions. Results presented here represent the first GWAS of OC in horses using the recently released Illumina Equine SNP50 BeadChip.
File Format	HTM / HTML
ISSN	02689146
Issue Number	Suppl 2
Volume Number	41
e-ISSN	13652052
Journal	Animal Genetics
Language	English
Publisher	Wiley-Blackwell
Publisher Date	2010-12-01
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Genetics Discipline Zoology Genome-wide Association Study Horse Diseases Genetics Osteochondrosis Veterinary Polymorphism, Single Nucleotide Animals Female Pathology Horses Male Quantitative Trait Loci Tarsal Joints Journal Article Research Support, Non-u.s. Gov't Research Support, U.s. Gov't, Non-p.h.s.
Content Type	Text
Resource Type	Article
Subject	Genetics Medicine Animal Science and Zoology

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