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Mitochondrial DNA sequence diversity and origin of Chinese domestic yak
Author(s) -
Lai S.J.,
Chen S.Y.,
Liu Y.P.,
Yao Y.G.
Publication year - 2007
Publication title -
animal genetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.756
H-Index - 81
eISSN - 1365-2052
pISSN - 0268-9146
DOI - 10.1111/j.1365-2052.2007.01555.x
Subject(s) - biology , mitochondrial dna , genetic diversity , yak , genetics , introgression , phylogenetic tree , domestication , mtdna control region , dna sequencing , evolutionary biology , gene , haplotype , genotype , population , zoology , demography , sociology
Summary In order to clarify the origin and genetic diversity of yak in China, we analysed mitochondrial DNA (mtDNA) control region sequences (∼ 891 bp) in 52 individuals from four domestic yak ( Poephagus grunniens ) breeds, as well as from a hybrid between yak and cattle (Pianniu). Twenty‐five samples were further selected for partial (420 bp) cytochrome b sequencing based on control region sequence information. Two yak samples shared sequences with Chinese cattle ( Bos taurus ); the remaining yak mtDNAs converged into two major clades in the phylogenetic analysis. Genetic diversity varied substantially among the breeds, with the hybrid Pianniu yak demonstrating the highest diversity. Our results suggest that the Chinese yak was domesticated from two distinct matrilineal sources or from a heterogeneous pool containing both divergent lineages, with occasional gene introgression from cattle.