K = 17 admixture analysis of prehistoric Eurasian genomes

Below is a plot for a K = 17 ADMIXTURE analysis that includes samples from across prehistoric Eurasia.

The correspondences between the colors and the components are as follows:

      Bushman and Pygmy
      Western Negroid
      Eastern Negroid
      European hunter-gatherer Caucasoid
      Northern European Caucasoid
      Southern European Caucasoid
      Northern Middle Eastern Caucasoid
      Southern Middle Eastern Caucasoid
      Veddoid-Caucasoid hybrid
      Taiwanese aborigine Mongoloid
      Southern Mongoloid
      Northern Mongoloid
      Itelmen and Koryak
      Eskimo
      Northern Amerindian
      Southern Amerindian
      Australoid

In this analysis the prehistoric R1b and R1a populations of Europe and Northern Asia show little to none of the Middle Eastern or South Asian components that they appear to have so much of in other ADMIXTURE analyses.

David Reich and his associates at one time made the absurd claim that Northern Europeans have a large amount of admixture from an Amerindian-like population, and they later claimed that the people of the Pit Grave culture had a large amount of admixture from an Armenian-like population. But just as the appearance of Amerindian-like admixture in Northern Europeans was an illusion that resulted from Northern-European-like admixture in Amerindians, the appearance of Middle Eastern or South Asian admixture in northern R1b and R1a populations like the Pit Grave population is an illusion resulting from admixture from R1b and R1a northerners in the populations of the Middle East and South Asia.

eurasia-k-17

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6 comments on “K = 17 admixture analysis of prehistoric Eurasian genomes
  1. Denis Anderthal says:

    So, the Pit Grave people had the North European component in an overwhelming proportion. I wonder whether that means that component in the modern European populations came from that population source, rather than the darker blue European hunter-gatherer component?

    Also, I’d be interested in seeing Kennewick Man’s results run through this calculator. His genome can be found from the links on this page: http://www.y-str.org/2015/07/8300-year-old-ancient-dna-of-kennewick.html Anzick 1 seems to be classified as 100% Amerindian here. I wonder if a component related to Kennewick Man’s mtdna X2 will make something other than that show up here.

    • Denis Anderthal says:

      I just noticed something else on your graph here: the second `Middle Dorset` sample has a large proportion (about 35%) of the European hunter-gatherer component. I’d be interested to see if Kennewick Man’s sample would show a similar result there.

    • Genetiker says:

      I wonder whether that means that component in the modern European populations came from that population source, rather than the darker blue European hunter-gatherer component?

      It doesn’t. The DNA that makes up most of the Northern European component was spread across Europe, from the Urals to the Atlantic, by the R1 Gravettians during the Paleolithic.

    • Genetiker says:

      I did a K = 4 ADMIXTURE analysis of the Kennewick Man genome. He was 86% Amerindian and 14% Mongoloid. He didn’t have any additional Caucasoid admixture.

      • Denis Anderthal says:

        I find that surprising. Kennewick Man was mtdna X2. Many ancient European dna samples have turned out to be X2 and no East Eurasian ones have been, at least so far. Surely there must be some autosomal component he shares with Europeans. I wonder why it doesn’t pick that up at K = 4?

  2. […] of analyzing the Copper and Bronze Age genomes from El Portalón cave with a calculator based on my K = 17 ADMIXTURE analysis of prehistoric Eurasian […]

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