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Hereditas(Beijing) ›› 2020, Vol. 42 ›› Issue (5): 493-505.doi: 10.16288/j.yczz.20-071

• Research Article • Previous Articles     Next Articles

The evaluation of genomic homozygosity for Xinjiang inbred population by SNP panels

Rui Shi1, Yi Zhang1, Yachun Wang1(), Tao Huang2(), Guochang Lu3, Tao Yue4, Zhenxi Lu3, Xixia Huang5, Xinpu Wei6, Shutang Feng7, Jun Chen8, Wulan Kagedeer8, Ruxianguli Abulizi8, Nuerhumaer Muhetaer8   

  1. 1. Key Laboratory of Animal Genetics, Breeding and Reproduction(MARA), National Engineering Laboratory for Animal Breeding, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China
    2. College of Animal Science and Technology, Xinjiang Shihezi University, Shihezi 832000, China
    3. Xinjiang Jinshengwang Agriculture and Science Technology Co., Ltd, Tacheng 834700, China
    4. Livestock Science and Technology Research and Extension Center of Tangcheng Area, Tacheng 834700, China
    5. College of Animal Science, Xinjiang Agricultural University, Urumqi 830052, China
    6. Xinjiang Hutubi Cattle Farm Co., Ltd, Changji 831100, China
    7. Insititute of Animal Scienece, Chinese Academy of Agricultural Sciences, Beijing 100193, China
    8. Animal Husbandry Service of Xinjiang Uygur Autonomous Region, Urumqi 830009, China;
  • Received:2020-03-15 Revised:2020-04-09 Online:2020-05-20 Published:2020-05-09
  • Contact: Wang Yachun,Huang Tao E-mail:wangyachun@cau.edu.cn;taohuagn100@sina.com
  • Supported by:
    Supported by China Agriculture Research System No(CARS-36);the Program for Changjiang Scholar and Innovation Research Team in University No(IRT_15R62)

Abstract:

Xinjiang inbred cattle is a population which has been highly inbred for 45 years. However, the breed origin of this population cannot be traced back due to the lack of original records. To demonstrate the genetic background of Xinjiang inbred cattle, we analysed the worldwide genomic information of 16 cattle breeds using principal components analysis, and Admixture method. Furthermore, the shared SNP markers of Xinjiang inbred cattle, local Kazakh cattle, Holstein cattle, and Xinjiang Brown cattle were extracted to calculate population genetic parameters and genomic inbreeding indicators in order to evaluate the magnitude of inbreeding in each population. We also evaluated the relationship between inbreeding indicators and body size in the Xinjiang inbred population. Finally, the high frequency runs of homozygosity (ROH) regions for Xinjiang inbred cattle and local Kazakh population were selected for genes and QTL annotations. These results demonstrate that the ancestry proportions of inbreeding breed are similar to those of Kazakh cattle. The genomic homozygosity of Xinjiang inbred cattle is significantly higher than other populations; the inbreeding depression is observed in body size to a certain extent because body size decreased when corresponding homozygosity increased. Totally, six basic bio-pathways and 32 QTL regions that related to bovine economical traits were annotated. Our results provide the insights into breeding strategies, future protection, and utilization plan design for this special genetic material-Xinjiang inbred cattle.

Key words: Xinjiang inbred cattle, population structure, genomic inbreeding, runs of homozygosity