TY  - JOUR
T1  - Molecular Phylogeny and Taxonomic Status of Domestic Yak Inferred from Cytochrome B Gene Partial Sequences
AU - , S.P. Li AU - , H. Chang AU - , G.M. Song AU - , G.L. Ma AU - , H.Y. Chen AU - , D.J. Ji AU - , R.Q. Geng 
JO  - Journal of Animal and Veterinary Advances
VL  - 6
IS  - 12
SP  - 1495
EP  - 1499
PY  - 2007
DA  - 2001/08/19
SN  - 1680-5593
DO  - javaa.2007.1495.1499
UR  - https://makhillpublications.co/view-article.php?doi=javaa.2007.1495.1499
KW  - Domestic yak (Bos grunniens)
KW  -cytochrome b gene
KW  -molecular phylogeny
KW  -taxonomic status
AB  - The domestic yak (<I>Bos grunniens</I>) is the most important domesticated bovine species in the Qinghai-Tibetan Plateau. In the present study, the cytochrome b (<I>Cyt b</I>) gene partial sequences (540 bp) of 27 domestic yaks (20 sequences determined in our study and 7 sequences cited in GenBank) were analyzed. Combined with the homologous fragments of other bovine <I>Cyt b</I> sequences in GenBank, the phylogenetic trees of Bovinae were reconstructed by Neighbor-Joining (NJ) methods with <I>Ovis aries</I> as outgroup. Sequence analysis showed that, among 540 sites compared for 27 domestic yaks, 9 variable sites (1.67% of 540 sites) and 5 different haplotypes were observed, showing very low mitochondrial genetic diversity in domestic yaks. The sequence divergence and divergence time between yak (<I>Bos grunniens</I>/<I>Bos mutus</I>) and American bison were 3.33% and 1.48-1.85 million years, respectively, lower and shorter than those between yak and genus Bos (<I>Bos taurus</I>/<I>Bos indicus</I>). Phylogenetic analysis showed that yak and American bison close clustered into one embranchment, while <I>Bos taurus</I> and <I>Bos indicus</I> independently clustered into another embranchment. Our results supported that the domestic yak was domesticated from a primitive yak different from the present wild yak and the yak should be classified as an independent genus Poephagus in Bovinae.
ER  -