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Y染色体单倍群Q1a揭示西伯利亚和印第安人之间古代的联系

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发表于 2011-6-20 15:26 | 显示全部楼层 |阅读模式
本帖最后由 198401 于 2011-6-20 15:32 编辑

Ancient links between Siberians and Native Americans revealed by subtyping the Y chromosome haplogroup Q1a.

Malyarchuk B, Derenko M, Denisova G, Maksimov A, Wozniak M, Grzybowski T,Dambueva I, Zakharov I.

Genetics Laboratory, Institute of Biological Problems of the North, RussianAcademy of Sciences, Magadan, Russia.

Abstract

To investigate the structure of Y chromosome haplogroups R-M207 and Q-M242 inhuman populations of North Asia, we have performed high-resolution genotypingusing both single nucleotide polymorphisms and short tandem repeat (STR)-basedapproaches of 121 M207- and M242-derived samples from 885 males of 16 ethnicgroups of Siberia and East Asia. As a result, the following Y chromosomehaplogroups were revealed: R1b1b1-M73 (2.0%), R1b1b2-M269 (0.7%), R2-M124 (1.1%),Q1a(*)-MEH2 (0.5%), Q1a2-M25 (0.1%), Q1a3(*)-M346 (9.2%) and Q1a3a-M3 (0.2%).Despite the low coalescence age of haplogroup Q1a3(*)-M346, which is estimated inSouth Siberia as about 4.5±1.5 thousand years ago (Ka), divergence time betweenthese Q1a3(*)-M346 haplotypes and Amerindian-specific haplogroup Q1a3a-M3 isequal to 13.8±3.9 Ka, pointing to a relatively recent entry date to America. Inaddition, unique cluster of haplotypes belonging to Q1a(*)-MEH2 was found inKoryaks inhabiting the Sea of Okhotsk coast (at a frequency of 10.3%). Althoughthe level of STR diversity associated with Q1a(*)-MEH2 is very low, this lineage appears to be closest to the extinct Palaeo-Eskimo individuals belonging to theSaqqaq culture arisen in the New World Arctic about 5.5 Ka. This finding suggeststhat Q1a(*)-MEH2 likely traces a population migration originating in NortheastSiberia across the Bering Strait.Journal of Human Genetics advance onlinepublication, 16 June 2011; doi:10.1038/jhg.2011.64.PMID: 21677663  [PubMed - as supplied by publisher]



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