Genomics Insights into the Demographic History and Introgression of Tibetan Pigs
Xue P, Zha C, Luo Y, Huang N, Liu N, Wang H, Fang M.
Abstract
In this study, we analyzed high-depth whole-genome resequencing data from 69 wild boars from 17 geographic regions and 29 Tibetan pigs from four regions to investigate the demographic history of different Tibetan pig groups. Our results showed that Tibetan pigs from Tibet had a demographic history distinct from that of the other three Tibetan pig groups. Demographic modelling based on the multidimensional site frequency spectrum indicated that Tibetan pigs from Tibet were best explained by a mixed origin involving both southern and northern wild boars, whereas the other three Tibetan pig groups were more likely to have diverged after the formation of the Tibetan pig population from Tibet. In addition, we detected a potential introgression signal between a wild boar from the Caucasus region and Tibetan pigs from Tibet, which may have contributed, at least in part, to adaptation to the high-altitude environment.
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