Abstract
The patterns of prehistoric migrations across the Bering Land Bridge are far from being completely understood: there still exists a significant gap in our knowledge of the population history of former Beringia. Here, through comprehensive survey of mitochondrial DNA genomes retained in ‘relic’ populations, the Maritime Chukchi, Siberian Eskimos, and Commander Aleuts, we explore genetic contribution of prehistoric Siberians/Asians to northwestern Native Americans. Overall, 201 complete mitochondrial sequences (52 new and 149 published) were selected in the reconstruction of trees encompassing mtDNA lineages that are restricted to Coastal Chukotka and Alaska, the Canadian Arctic, Greenland, and the Aleutian chain. Phylogeography of the resulting mtDNA genomes (mitogenomes) considerably extends the range and intrinsic diversity of haplogroups (eg, A2a, A2b, D2a, and D4b1a2a1) that emerged and diversified in postglacial central Beringia, defining independent origins of Neo-Eskimos versus Paleo-Eskimos, Aleuts, and Tlingit (Na-Dene). Specifically, Neo-Eskimos, ancestral to modern Inuit, not only appear to be of the High Arctic origin but also to harbor Altai/Sayan-related ancestry. The occurrence of the haplogroup D2a1b haplotypes in Chukotka (Sireniki) introduces the possibility that the traces of Paleo-Eskimos have not been fully erased by spread of the Neo-Eskimos or their descendants. Our findings are consistent with the recurrent gene flow model of multiple streams of expansions to northern North America from northeastern Eurasia in late Pleistocene–early Holocene.
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Acknowledgements
The authors have greatly benefited from conversations with Anatoly P Derevianko. The help of Andre M Sukernik and Alexander Kim in editing the final draft of the manuscript is gratefully acknowledged. This work received support from Russian Foundation for Basic Research (#12-04-01851), the Ministry of Education and Science, Russian Federation, and was partly funded by the Russian Academy of Science Program on Molecular and Cellular Biology.
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Dryomov, S., Nazhmidenova, A., Shalaurova, S. et al. Mitochondrial genome diversity at the Bering Strait area highlights prehistoric human migrations from Siberia to northern North America. Eur J Hum Genet 23, 1399–1404 (2015). https://doi.org/10.1038/ejhg.2014.286
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DOI: https://doi.org/10.1038/ejhg.2014.286
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