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Thread ID: 11384 | Posts: 1 | Started: 2003-12-06
2003-12-06 20:12 | User Profile
Y-Chromosome Evidence for Differing Ancient demographic Histories in the Americas - Am. J. Hum. Genet. 73:524ö539, 2003
[url]http://www.ucl.ac.uk/tcga/tcgapdf/Bortolini-AJHG-03-YAmer.pdf[/url]
ââ¬ÅHere, we report an analysis of Y-chromosome diversity (including the novel M242 polymorphism) in Native Americans and in a diverse sample from Mongolia, an important candidate region for the Asian source of the initial colonizers of the Americas (Neel et al. 1994; Kolman et al. 1996; Merriwether et al. 1996). The Native American populations typed include a Na Deneë sample and a large set of South Amerinds. These data provide strong support for the occurrence of two major male migrations from central Siberia into America and are consistent with the existence of ancient links between proto-Europeans and proto-Native Americans. A lineage (Q-M19) with a restricted geographic distribution in South America has a diversity similar to that of its ancestor lineage Q-M3, suggesting an isolation of some Amerind populations soon after the initial dispersal of settlers in South America. In contrast to mtDNA analyses, Y-microsatellite diversity is more consistent with a relatively late colonization of the Americas.ââ¬Â