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蓝海人类学在线 Ryan WEI's Forum of Anthropology

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藏缅人群的遗传结构显示南方藏缅的形成中存在性别偏差

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发表于 2010-1-23 14:39 | 显示全部楼层 |阅读模式
Analyses of Genetic Structure of Tibeto-Burman Populations Reveals Sex-Biased Admixture in Southern Tibeto-Burmans
Bo Wen1, ,  , Xuanhua Xie1, Song Gao1, Hui Li1, Hong Shi2, 3, Xiufeng Song1, Tingzhi Qian1, Chunjie Xiao2, Jianzhong Jin1, Bing Su3, 4, Daru Lu1, Ranajit Chakraborty4 and Li Jin1, 4, ,

An unequal contribution of male and female lineages from parental populations to admixed ones is not uncommon in the American continents, as a consequence of directional gene flow from European men into African and Hispanic Americans in the past several centuries. However, little is known about sex-biased admixture in East Asia, where substantial migrations are recorded. Tibeto-Burman (TB) populations were historically derived from ancient tribes of northwestern China and subsequently moved to the south, where they admixed with the southern natives during the past 2,600 years. They are currently extensively distributed in China and Southeast Asia. In this study, we analyze the variations of 965 Y chromosomes and 754 mtDNAs in 120 TB populations from China. By examining the haplotype group distributions of Y-chromosome and mtDNA markers and their principal components, we show that the genetic structure of the extant southern Tibeto-Burman (STB) populations were primarily formed by two parental groups: northern immigrants and native southerners. Furthermore, the admixture has a bias between male and female lineages, with a stronger influence of northern immigrants on the male lineages (~62%) and with the southern natives contributing more extensively to the female lineages (~56%) in the extant STBs. This is the first genetic evidence revealing sex-biased admixture in STB populations, which has genetic, historical, and anthropological implications.

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