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He S, Zhang Z, Sun Y, Ren T, Li W, Zhou X, Michal JJ, Jiang Z, Liu M. Genome-wide association study shows that microtia in Altay sheep is caused by a 76 bp duplication of HMX1. Anim Genet 2019; 51:132-136. [PMID: 31691317 DOI: 10.1111/age.12876] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/10/2019] [Indexed: 01/29/2023]
Abstract
Microtia is a congenital malformation of the external ear that can be observed in many species including sheep. However, the genetic basis of microtia still remains unclear. Here, a GWAS was conducted to investigate the genetic basis underlying microtia. A total of 55 samples from 26 microtia and 29 normal animals were genotyped with Illumina OvineHD BeadChip. The strongest significant SNP was identified on OAR6, approximating the evolutionarily conserved region of the HMX1 gene, which is related to congenital malformations of the external ear in other species such as cattle and rats. Sequencing an evolutionarily conserved region surrounding HMX1 revealed a duplication of 76 bp, which is concordant with microtia, suggesting a dominant inheritance mode. Identification of this causal mutation in the HMX1 gene indicates the role of this particular gene in the development of the external ear and provides a genetic marker for selection against microtia.
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Affiliation(s)
- S He
- Key Laboratory of Ruminant Genetics, Breeding and Reproduction, Ministry of Agriculture, Key Laboratory of Animal Biotechnology of Xinjiang, Institute of Biotechnology, Xinjiang Academy of Animal Science, Urumqi, Xinjiang, 830026, China.,Department of Animal Sciences, Washington State University, Pullman, WA, 99164-7620, USA
| | - Z Zhang
- Key Laboratory of Ruminant Genetics, Breeding and Reproduction, Ministry of Agriculture, Key Laboratory of Animal Biotechnology of Xinjiang, Institute of Biotechnology, Xinjiang Academy of Animal Science, Urumqi, Xinjiang, 830026, China
| | - Y Sun
- Key Laboratory of Ruminant Genetics, Breeding and Reproduction, Ministry of Agriculture, Key Laboratory of Animal Biotechnology of Xinjiang, Institute of Biotechnology, Xinjiang Academy of Animal Science, Urumqi, Xinjiang, 830026, China
| | - T Ren
- Key Laboratory of Ruminant Genetics, Breeding and Reproduction, Ministry of Agriculture, Key Laboratory of Animal Biotechnology of Xinjiang, Institute of Biotechnology, Xinjiang Academy of Animal Science, Urumqi, Xinjiang, 830026, China
| | - W Li
- Key Laboratory of Ruminant Genetics, Breeding and Reproduction, Ministry of Agriculture, Key Laboratory of Animal Biotechnology of Xinjiang, Institute of Biotechnology, Xinjiang Academy of Animal Science, Urumqi, Xinjiang, 830026, China
| | - X Zhou
- Department of Animal Sciences, Washington State University, Pullman, WA, 99164-7620, USA.,Key Laboratory of Agricultural Animal Genetics, Breeding, and Reproduction of Ministry of Education and Key Laboratory of Swine Genetics and Breeding of Ministry of Agriculture, Huazhong Agricultural University, Wuhan, 430070, Hubei, China
| | - J J Michal
- Department of Animal Sciences, Washington State University, Pullman, WA, 99164-7620, USA
| | - Z Jiang
- Department of Animal Sciences, Washington State University, Pullman, WA, 99164-7620, USA
| | - M Liu
- Key Laboratory of Ruminant Genetics, Breeding and Reproduction, Ministry of Agriculture, Key Laboratory of Animal Biotechnology of Xinjiang, Institute of Biotechnology, Xinjiang Academy of Animal Science, Urumqi, Xinjiang, 830026, China
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