Y-Chromosome Evidence for Differing Ancient Demographic Histories in the Americas

Y-Chromosome Evidence for Differing Ancient Demographic Histories in the Americas

Abstract:

To scrutinize the male ancestry of extant Native American populations, we examined eight biallelic and six microsatellite polymorphisms from the nonrecombining portion of the Y chromosome, in 438 individuals from 24 Native American populations (1 Na Dené and 23 South Amerinds) and in 404 Mongolians. One of the biallelic markers typed is a recently identified mutation (M242) characterizing a novel founder Native American haplogroup. The distribution, relatedness, and diversity of Y lineages in Native Americans indicate a differentiated male ancestry for populations from North and South America, strongly supporting a diverse demographic history for populations from these areas. These data are consistent with the occurrence of two major male migrations from southern/central Siberia to the Americas (with the second migration being restricted to North America) and a shared ancestry in central Asia for some of the initial migrants to Europe and the Americas. The microsatellite diversity and distribution of a Y lineage specific to South America (Q-M19) indicates that certain Amerind populations have been isolated since the initial colonization of the region, suggesting an early onset for tribalization of Native Americans. Age estimates based on Y-chromosome microsatellite diversity place the initial settlement of the American continent at ?14,000 years ago, in relative agreement with the age of well-established archaeological evidence.

Citation:

  • Bortolini, M.; Salzano, F.; Thomas, M.; Stuart, S.; Nasanen, S.; Bau, C.; Hutz, M.; Layrisse, Z.; Petzlerler, M. & Tsuneto, L. (2003). Y-Chromosome Evidence for Differing Ancient Demographic Histories in the Americas. American journal of human genetics, 73(3), 524-539.

Source Link:
http://www.dx.doi.org/10.1086/377588

Keywords

Peoples: - | Places: - | Topics: - | DNA Type: Y-DNA

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