Characterization of the complete mitochondrial genome sequence of Gannan yak (Bos grunniens).

Gannan yak is the native breed of Gansu province in China. In this work, the complete mitochondrial genome sequence of Gannan yak was determined for the first time. The total length of the mitogenome is 16,322 bp long, with the base composition of 33.74% A, 25.84% T, 13.18% C, and 27.24% G. It contained 13 protein-coding genes, 22 tRNA genes, two rRNA genes and one non-coding region (D-loop region). The gene order of Gannan yak mitogenome is identical to that observed in most other vertebrates. The complete mitogenome sequence information of Gannan yak can provide useful data for further studies on protection of genetic resources and phylogenetic relationships within Bos grunniens.