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Study raises doubt about human/neandertal hybridization

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  • Moderators, Science, Health & Environment Moderators, Society & Culture Moderators Posts: 60,109 Mod ✭✭✭✭Wibbs


    Naw I don't buy it. The separation between what were going to become moderns and Neandertals kicked off around 600,000 years ago and we had diverged by 300,000 years ago. So how come African folks didn't hang onto these commonalities? In order for north Africans that led to us hanging onto them then they were getting jiggy with European/Levantine peoples throughout that time so that still shows hybridisation. I don't buy that one either. Evidence in the stones and bones shows us and them hanging out for 10,000 years in the Levant, in the same areas, cheek to jowl in neighbouring caves and that's when the genetic clocks seem to suggest we got all romantic. That makes more sense than this article. For my mind anyway.

    Rejoice in the awareness of feeling stupid, for that’s how you end up learning new things. If you’re not aware you’re stupid, you probably are.



  • Registered Users Posts: 27,564 ✭✭✭✭steddyeddy


    New study carried out by Cambridge university claims that neaderthal-human DNA similarities are a result of shared ancestory rather than interbreeding.

    http://www.bbc.co.uk/news/science-environment-19250778

    For those on smartphones heres the link.
    Neanderthal breeding idea doubted

    By Jonathan Ball BBC News Neanderthals were close evolutionary cousins of our own species - Homo sapiens
    Similarities between the DNA of modern people and Neanderthals are more likely to have arisen from shared ancestry than interbreeding, a study reports.
    That is according to research carried out at the University of Cambridge and published this week in PNAS journal.
    Previously, it had been suggested that shared parts of the genomes of these two populations were the result of interbreeding.
    However, the newly published research proposes a different explanation.
    The origin of modern humans is a hotly debated topic; four main theories have arisen to describe the evolution of Homo sapiens.
    All argue for an African origin, but an important distinction in these competing theories is whether or not interbreeding - or "hybridisation" - occurred between Homo sapiens and other members of the genus Homo.
    In the current study, Cambridge evolutionary biologists Dr Anders Eriksson and Dr Andrea Manica used computer simulations to reassess the strength of evidence supporting hybridisation events.
    They argue that the amount of DNA shared between modern Eurasian humans and Neanderthals - estimated at between 1-4% - can be explained if both arose from a geographically isolated population, most likely in North Africa, which shared a common ancestor around 300-350 thousand years ago.
    When modern humans expanded out of Africa, around 60-70,000 years ago, they took that genetic similarity with them.
    By contrast, previous ancient DNA studies of Neanderthal remains have shown that their genomes harbour genetic signatures - polymorphisms - that are also seen in the genomes of modern Europeans, East Asians and Oceanians (from Papua New Guinea) but not in modern African populations.
    The findings challenged previously held views - based on several lines of evidence - that modern humans had replaced the Neanderthals with little or no gene flow occurring between the two groups.

    The observations from the Neanderthal genome led some evolutionary biologists to argue that this genetic similarity had arisen through hybridisation between Neanderthals - already resident in Europe and western Asia - and the ancestors of present-day non-Africans.
    Prof David Reich, from Harvard University in Cambridge, US - an exponent of the hybridisation theory - is not convinced that the data represents a powerful argument against interbreeding.
    By using methods that are able to differentiate between genetic similarity caused by gene flow via hybridisation vs shared ancestry, he argues that "the patterns observed [in our analyses] are exactly what one would expect from recent gene flow" - a view shared by his collaborator Professor Svante Paabo from the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany.
    Prof Reich went on to say that their data shows that Neanderthals and non-Africans last exchanged genetic material 47-65,000 years ago.



    What do people think? Personally I think shared ancestory explains what looks like recent gene flow.


  • Moderators, Science, Health & Environment Moderators, Society & Culture Moderators Posts: 60,109 Mod ✭✭✭✭Wibbs


    Yea it's the same research linked in the OP. Doesn't ring true for me S. I'd suspect it's a touch of the "but, but, Out of Africa must be true surely?. For a start how do they explain east Asian folks with other archaic DNA? Never mind why did those north Africans not keep gene flow going with their southern cousins? Today that's less likely with the Sahara in the way, but that's a recent thing. 8,000 years ago the Sahara was lush and had a fair bit of human habitation.

    Rejoice in the awareness of feeling stupid, for that’s how you end up learning new things. If you’re not aware you’re stupid, you probably are.



  • Registered Users Posts: 27,564 ✭✭✭✭steddyeddy


    Whoops sorry guys didnt see it!


  • Registered Users Posts: 30,746 ✭✭✭✭Galvasean


    Woops, forgot to put in a 'threads merged' notice :o

    Bad Moderator!


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