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Thread: Estimating the Impact of Prehistoric Admixture on the Genome of Europeans

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    Post Estimating the Impact of Prehistoric Admixture on the Genome of Europeans

    Estimating the Impact of Prehistoric Admixture on the Genome of Europeans

    Isabelle Dupanloup*,1, Giorgio Bertorelle*, Lounès Chikhi and Guido Barbujani*
    * Dipartimento di Biologia, Università di Ferrara, Ferrara, Italy
    UMR Evolution et Diversité Biologique, Université Paul Sabatier, Toulouse, France

    Correspondence: E-mail: g.barbujani@unife.it.

    Abstract

    We inferred past admixture processes in the European population from genetic diversity at eight loci, including autosomal, mitochondrial and Y-linked polymorphisms. Admixture coefficients were estimated from multilocus data, assuming that most current populations can be regarded as the result of a hybridization process among four or less potential parental populations. Two main components are apparent in the Europeans' genome, presumably corresponding to the contributions of the first, Paleolithic Europeans, and of the early, Neolithic farmers dispersing from the Near East. In addition, only a small fraction of the European alleles seems to come from North Africa, and a fourth component reflecting gene flow from Northern Asia is largely restricted to the northeast of the continent. The estimated Near Eastern contribution decreases as one moves from east to west, in agreement with the predictions of a model in which (Neolithic) immigrants from the Near East contributed a large share of the alleles in the genome of current Europeans. Several tests suggest that probable departures from the admixture models, due to factors such as choice of the putative parental populations and more complex demographic scenarios, may have affected our main estimates only to a limited extent.

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    Post Re: Estimating the Impact of Prehistoric Admixture on the Genome of Europeans

    Interesting article, though it is somewhat irritating how much studies made in the last 4 years can differ in their results...

    If its right what they say, the Nordid type in the narrower sense (Danubian-Corded-Skandonordid) might be really a depigmented (by mixture and re-selection? Came already in that form from the Near East?) Mediterranoid type, more or less like Coon said.

    But maybe that just my interpretation, and of course, these results and its interpretation might not be the final one.
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    Post Re: Estimating the Impact of Prehistoric Admixture on the Genome of Europeans

    Well, why do I care? Why do Meds always link themselves to the Levant? Oh, that's right! They want to claim some "fame"...All the studies I did of those people in history classes showed how vile they were, despite the texts' attempts to encase them in glory.

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    Post Re: Estimating the Impact of Prehistoric Admixture on the Genome of Europeans

    Quote Originally Posted by Agrippa
    Interesting article, though it is somewhat irritating how much studies made in the last 4 years can differ in their results...

    If its right what they say, the Nordid type in the narrower sense (Danubian-Corded-Skandonordid) might be really a depigmented (by mixture and re-selection? Came already in that form from the Near East?) Mediterranoid type, more or less like Coon said.

    But maybe that just my interpretation, and of course, these results and its interpretation might not be the final one.
    There should be made work out of taking zonal geological, hydrological and climatic situation into consideration in stead of relying too much to sacrosant genome studies, which never fail to let me unimpressed and sceptic.

    An ecological boundary where a Mediterrenean subsistence regime is applied, runs like a reversed fan to e.g. the northwestern corner of Great Hungarian Plain, the Jaszag area, where Mesolithics would keep unto themselves and only much later reluctantly and with their own stamp on it, adopt a Neolithic way of living; I mentioned elsewhere the Transdanubian LBK unaffected by the symbolic art and expression of the East Mediterrenean, indicating that the indigenous element in the Danubians shouldn't be underestimated.
    The Danubian expanse contained three different types, of which foremost the Atl.-Med and small paedomorphic proper Danubian show a degree of intermingling and next to them, a rugged-boned Cromagnoid.
    Besides in SW Europe Atl.-Med. types have risen long before any Neolithic in-flow.
    Even among the Capsians, there is UP survival and the tall, linear Near Eastern Natufian is basically Combe Capelle, but gracilized, with steeper forehead, rounder skull, reduced browridges, etc...
    So, if we push forward a simple adaptionist scenario linked to change of diet and its effect on bone structure, facia size and constitutional shaping of the total body and its drastic consequence in the genic material, we might be able to dispel a migrationist theory and allowed to see this neolithic progression as an impact of one part cultural-technological improvement, one part a physical revolution of native SE Europeans meeting new demands within a particular ecological niche.

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    Post Re: Estimating the Impact of Prehistoric Admixture on the Genome of Europeans

    We must remember that it is likely the religious people from the Levant brought bodies, too.

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    Post Re: Estimating the Impact of Prehistoric Admixture on the Genome of Europeans

    Quote Originally Posted by Rodskarl Dubhgall
    We must remember that it is likely the religious people from the Levant brought bodies, too.
    Hither Asia would make sense, but it's but accessory to this great circum-Pontic and East Mediterrenean complex...further south into the Levant and onwards to Mesopotamia, the dimensions increase.

    Hither Asia in general or Anatolian finds like Hissarlik are approximate but aren't identical to the Balkan types.

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    Post Re: Estimating the Impact of Prehistoric Admixture on the Genome of Europeans

    Nor should they be!


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    Post Re: Estimating the Impact of Prehistoric Admixture on the Genome of Europeans

    I think there is still much to do and probably Neolithic farmers came, spread their genes, and those were selected for in the mixed populations.

    So at the moment the answer isnt clear, though I think you described it quite good Frans, and I agree on many points.

    And again, looking at so much differences on such subject which should be one of the more easy to solve ones, doesnt increase my trust in studies like that.

    Though I think about how this results are possible...maybe its really like that: Some Neolithics came, maybe even in great numbers, but not comparable to what this study is suggesting.
    They mixed and certain genes and associated sequences were selected, so after the adaptation of the new "way of life" this genes, brought by Neolithics most of the time are dominant, though their real overall contribution might be still different.

    Oh well, just guessing around of course...

    Wait for other studies on this subject.
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    Post Re: Estimating the Impact of Prehistoric Admixture on the Genome of Europeans

    Maybe certain survival genes are linked to the emotions we experience. Perhaps the emotions to survive imbued us to breed with the prime people, carrying neolithic in us to feel popular or worthy perhaps also.

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    Smile Re: Estimating the Impact of Prehistoric Admixture on the Genome of Europeans

    Quote Originally Posted by Euclides
    Estimating the Impact of Prehistoric Admixture on the Genome of Europeans
    Another very useful paper, Euclides. Thanks for uploading it here!

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