文献类型： 外文期刊
第一作者： Wang, Xingdong
作者： Wang, Xingdong;Pei, Jie;Xiong, Lin;Bao, Pengjia;Chu, Min;Ma, Xiaoming;La, Yongfu;Liang, Chunnian;Yan, Ping;Guo, Xian;Wang, Xingdong;Pei, Jie;Xiong, Lin;Bao, Pengjia;Chu, Min;Ma, Xiaoming;La, Yongfu;Liang, Chunnian;Yan, Ping;Guo, Xian
作者机构：
关键词： Genetic diversity; Mitochondrial DNA; Phylogeography; Yak; Glacial refugia
期刊名称：BMC GENOMICS （ 影响因子：4.4； 五年影响因子：4.7 ）
ISSN： 1471-2164
年卷期： 2024 年 25 卷 1 期
页码：
收录情况： SCI
摘要： Background There is no consensus as to the origin of the domestic yak (Bos grunniens). Previous studies on yak mitochondria mainly focused on mitochondrial displacement loop (D-loop), a region with low phylogenetic resolution. Here, we analyzed the entire mitochondrial genomes of 509 yaks to obtain greater phylogenetic resolution and a comprehensive picture of geographical diversity. Results A total of 278 haplotypes were defined in 509 yaks from 21 yak breeds. Among them, 28 haplotypes were shared by different varieties, and 250 haplotypes were unique to specific varieties. The overall haplotype diversity and nucleotide diversity of yak were 0.979 +/- 0.0039 and 0.00237 +/- 0.00076, respectively. Phylogenetic tree and network analysis showed that yak had three highly differentiated genetic branches with high support rate. The differentiation time of clades I and II were about 0.4328 Ma, and the differentiation time of clades (I and II) and III were 0.5654 Ma. Yushu yak is shared by all haplogroups. Most (94.70%) of the genetic variation occurred within populations, and only 5.30% of the genetic variation occurred between populations. The classification showed that yaks and wild yaks were first clustered together, and yaks were clustered with American bison as a whole. Altitude had the highest impact on the distribution of yaks. Conclusions Yaks have high genetic diversity and yak populations have experienced population expansion and lack obvious phylogeographic structure. During the glacial period, yaks had at least three or more glacial refugia.
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