›› 2016, Vol. 43 ›› Issue (3): 746-753.doi: 10.16431/j.cnki.1671-7236.2016.03.027

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Polymorphism Study on DRB3 Gene Exon 2 in Tianzhu White Yak and Gannan Yak Arlud

SHA Ri-nai1, AN Tian-wu2, E Guang-xin3, HAN Jian-lin1   

  1. 1. Institute of Animal Sciences, Chinese Academy of Animal Sciences, Beijing 100193, China;
    2. Sichuan Academy of Grassland Science, Chengdu 611731, China;
    3. Southwest University, Chongqing 400716, China
  • Revised:2015-12-22 Online:2016-03-20 Published:2016-03-30

Abstract: In this study,CDS sequence of DRB3 gene exon 2 in Tianzhu White yak and Gannan yak were analyzed,a clean single chain was obtained to get the accurate haplotype by direct sequencing and amplification refractory mutation system (ARMS) method,the double chain of high heterozygosity was typed.The results showed that 65 SNPs and a codon insertion and deletion were discovered,all together separated to 30 haplotypes,in which seven haplotypes were found firstly,it should be peculiar to Tianzhu White yak and Gannan yak.Compared with published bovine DRB3 gene exon 2 haplotypes,the analysis results showed Tianzhu White yak and Gannan yak shared haplotypes of cattle (Bos taurus) and zebu (Bos indicus),which meaned they might crossed with cattle (Bos taurus) and zebu (Bos indicus).PAML analysis showed that 4,25,30,53,59,62,63,66,78 amino acid sites were affected by positive selection,and mainly occurred in Tianzhu yak,it had a certain relation with breeding history of Tianzhu White yak.

Key words: Tianzhu White yak; Gannan yak; DRB3 gene; exon 2; polymorphism

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