Recurrent laryngeal neuropathy (RLN) is a major upper-airway disease of horses that causes abnormal respiratory noise during exercise and can impair performance. Etiopathogenesis remains unclear but genetic factors have been suspected for many decades. The objective of this study was to identify risk loci associated with RLN. To that end we genotyped 234 cases (196 Warmbloods, 20 Trotters, 14 Thoroughbreds, and 4 Draft horses), 228 breed-matched controls, and 69 parents with the Illumina Equine SNP50 BeadChip. Using these data, we quantified population structure and performed single-marker and haplotype-based association studies, as well as family-based linkage analyses. We accounted for population stratification by modeling a random polygenic background effect with covariance structure estimated from genome-wide SNP data. Using the haplotype-based approach, we identified two genome-wide suggestive loci in Warmbloods, respectively on chromosomes 21 (p = 1.62 × 10−6) and 31 (p = 1.69 × 10−5). The two signals were driven by the enrichment of a “protective” haplotype in controls compared to cases.
Mammalian Genome – Springer Journals
Published: Jun 23, 2011
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