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Native Americans Descended from One?

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  • Native Americans Descended from One?

    The land bridge theory of migration for Native Americans is well-known. But a twenty-year study reveals an interesting twist.


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  • #2
    So, 53 different DNA strands sampled. 1-32 are in Asia and NONE of them match the samples taken in the America's and we still cling to a "land-bridge" theory of settlement in the America's?
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    • #3
      Interesting article. I would like to see a longer article with follow-up in the future.

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      • #4
        So the "interesting twist" is, where was the semi-permanent settlement?
        Hmmm?

        Alaska perhaps? Western Canada, near the Southern border? Northwestern US-area, maybe?

        Factor in CE Amer-indian population concentrations. Perhaps BCE climate differences from the CE? What do the latest archeological findings, if any, indicate?
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        • #5
          The research doesn't negate the Bering land bridge theory. It just indicates that the original Americans who migrated across the land bridge probably descended from a Siberian population that had been genetically isolated from the rest of Asia for quite a long time...
          "Our work provides strong evidence that, in general, Native Americans are more closely related to each other than to any other existing Asian populations, except those that live at the very edge of the Bering Strait," said Kari Britt Schroeder, a lecturer at the University of California, Davis, and the first author on the paper describing the study.

          "While earlier studies have already supported this conclusion, what's different about our work is that it provides the first solid data that simply cannot be reconciled with multiple ancestral populations," said Schroeder, who was a Ph.D. student in anthropology at the university when she did the research.

          The study is published in the May issue of the journal Molecular Biology and Evolution.

          The team's work follows up on earlier studies by several of its members who found a unique variant (an allele) of a genetic marker in the DNA of modern-day Native American people. Dubbed the "9-repeat allele," the variant (which does not have a biological function), occurred in all of the 41 populations that they sampled from Alaska to the southern tip of Chile, as well as in Inuit from Greenland and the Chukchi and Koryak people native to the Asian (western) side of the Bering Strait. Yet this allele was absent in all 54 of the Eurasian, African and Oceanian groups the team sampled.

          Overall, among the 908 people who were in the 44 groups in which the allele was found, more than one out of three had the variant.

          In these earlier studies, the researchers concluded that the most straightforward explanation for the distribution of the 9-repeat allele was that all modern Native Americans, Greenlanders and western Beringians descend from a common founding population. Furthermore, the fact that the allele was absent in other Asian populations most likely meant that America's ancestral founders had been isolated from the rest of Asia for thousands of years before they moved into the New World: that is, for a period of time that was long enough to allow the allele to originate in, and spread throughout, the isolated population... LINK
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