Replication and fine-mapping of a QTL for recurrent airway obstruction in European Warmblood horses.

Shakhsi-Niaei, M; Klukowska-Rötzler, Jolanta; Drögemüller, Cord; Swinburne, J; Ehrmann, C; Saftic, Dounia; Ramseyer, Alessandra; Gerber, Vinzenz; Dolf, Gaudenz; Leeb, Tosso (2012). Replication and fine-mapping of a QTL for recurrent airway obstruction in European Warmblood horses. Animal genetics, 43(5), pp. 627-631. Blackwell 10.1111/j.1365-2052.2011.02315.x

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Recurrent airway obstruction (RAO), or 'heaves', is a common performance-limiting allergic respiratory disease of mature horses. It is related to sensitization and exposure to mouldy hay and has a familial basis with a complex mode of inheritance. In a previous study, we detected a QTL for RAO on ECA 13 in a half-sib family of European Warmblood horses. In this study, we genotyped additional markers in the family and narrowed the QTL down to about 1.5 Mb (23.7-25.2 Mb). We detected the strongest association with SNP BIEC2-224511 (24,309,405 bp). We also obtained SNP genotypes in an independent cohort of 646 unrelated Warmblood horses. There was no genome-wide significant association with RAO in these unrelated horses. However, we performed a genotypic association study of the SNPs on ECA 13 in these unrelated horses, and the SNP BIEC2-224511 also showed the strongest association with RAO in the unrelated horses (p(raw) = 0.00037). The T allele at this SNP was associated with RAO both in the family and the unrelated horses. Thus, the association study in the unrelated animals provides independent support for the previously detected QTL. The association study allows further narrowing of the QTL interval to about 0.5 Mb (24.0-24.5 Mb). We sequenced the coding regions of the genes in the critical region but did not find any associated coding variants. Therefore, the causative variant underlying this QTL is likely to be a regulatory mutation.

Item Type:

Journal Article (Original Article)

Division/Institute:

05 Veterinary Medicine > Research Foci > Host-Pathogen Interaction
05 Veterinary Medicine > Department of Clinical Veterinary Medicine (DKV) > Equine Clinic
05 Veterinary Medicine > Department of Clinical Veterinary Medicine (DKV)
05 Veterinary Medicine > Department of Clinical Research and Veterinary Public Health (DCR-VPH) > Institute of Genetics
05 Veterinary Medicine > Department of Clinical Research and Veterinary Public Health (DCR-VPH)

UniBE Contributor:

Klukowska, Jolanta; Drögemüller, Cord; Kehrli, Dounia; Ramseyer, Alessandra; Gerber, Vinzenz; Dolf, Gaudenz and Leeb, Tosso

Subjects:

500 Science > 590 Animals (Zoology)
600 Technology > 630 Agriculture

ISSN:

0268-9146

Publisher:

Blackwell

Language:

English

Submitter:

Andrea Gassmann-Suter

Date Deposited:

24 Mar 2015 13:32

Last Modified:

12 Sep 2017 16:43

Publisher DOI:

10.1111/j.1365-2052.2011.02315.x

PubMed ID:

22497545

BORIS DOI:

10.7892/boris.65188

URI:

https://boris.unibe.ch/id/eprint/65188

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