Qianyun Ge , Caixia Gao , Yuan Cai , Ting Jiao , Jinqiang Quan , Yongbo Guo , Wangshan Zheng , Shengguo Zhao *
Asian-Australas J Anim Sci. 2019 Jul 1. doi: 10.5713/ajas.19.0275. [Epub ahead of print]
Evidence from previous reports indicates that pig domestication in East Asia mainly occurred in the Mekong region and the middle and downstream regions of the Yangtze River. Further research identified two new origin centers for domestic pigs in the Tibetan Plateau and the islands of Southeast Asia. However, due to the small sample size of Tibetan pigs, details of the origin and spread of Tibetan pigs has not yet been established.
METHODS AND RESULTS:
We analyzed mitochondrial DNA control region (D-loop) variation in 1201 individuals from nine Tibetan pig populations across five provinces. Comprehensive Tibetan pig samples were taken to perform the most detailed analysis of Tibetan pigs to date. The result indicate that Rkaze pigs had the lowest level of diversity, while Changdu pigs had the highest diversity. Interestingly, these two populations were both in the Tibetan Plateau area. If we calculate diversity in terms of each province, the Tibetan Plateau area had the lowest diversity, while the Chinese province of Gansu had the highest diversity. Diversity gradient analysis of major haplotypes suggested three domestication centers of Tibetan pigs in the Tibetan Plateau and the Chinese provinces of Gansu and Yunnan.
We find two new domestication centers for Tibetan pigs. One is in the Chinese province of Gansu, which lies in the upstream region of the Yellow River, and the other is in the Chinese province of Yunnan.
Phylogeny; Polymorphism; Tibetan Pig; Upstream Region of the Yellow River; mtDNA D-Loop