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Thread: Ancient genomes reveal complex patterns of population movement, interaction, and repl

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    Ancient genomes reveal complex patterns of population movement, interaction, and repl

    Title fixed: Ancient genomes reveal complex patterns of population movement, interaction, and replacement in sub-Saharan Africa

    Abstract:
    Africa hosts the greatest human genetic diversity globally, but legacies of ancient population interactions and dispersals across the continent remain understudied. Here, we report genome-wide data from 20 ancient sub-Saharan African individuals, including the first reported ancient DNA from the DRC, Uganda, and Botswana. These data demonstrate the contraction of diverse, once contiguous hunter-gatherer populations, and suggest the resistance to interaction with incoming pastoralists of delayed-return foragers in aquatic environments. We refine models for the spread of food producers into eastern and southern Africa, demonstrating more complex trajectories of admixture than previously suggested. In Botswana, we show that Bantu ancestry post-dates admixture between pastoralists and foragers, suggesting an earlier spread of pastoralism than farming to southern Africa. Our findings demonstrate how processes of migration and admixture have markedly reshaped the genetic map of sub-Saharan Africa in the past few millennia and highlight the utility of combined archaeological and archaeogenetic approaches.
    Paper is open access here: https://advances.sciencemag.org/cont.../eaaz0183.full
    ἦθος ἀνθρώπῳ δαίμων

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    Can't wait to read this when I get home.

    Looks like we have our first Ancient East African (Dinka-like) DNA in Kakapel 900 and 300 BP. Not that old and the former has minor Levantine ancestry but still better than nothing.
    Ελευθερία ή θάνατος.

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    Quote Originally Posted by Michalis Moriopoulos View Post
    Can't wait to read this when I get home.

    Looks like we have our first Ancient East African (Dinka-like) DNA in Kakapel 900 and 300 BP. Not that old but still better than nothing.
    Also, a Mota + ~20% Mbuti Individual in the same area 3900BP!

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    There is a very cool insight here from the the authors: that aquatic foragers may have persisted in their habitats for much longer than other forager groups when encountering pastoralist populations in East Africa.

    This makes me think about the origins of the Nilo-Saharan groups. It seems like a decent hypothesis that they existed as foragers along the White Nile (especially the Sudd wetlands) and some combination of high density and local survival advantage in this environment allowed them to resist absorption or displacement from the incoming pastoralists, eventually adopting pastoralism themselves and expanding which I would take to be the divergence point for the proto-language community.

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    There's a 150 bp Congo sample with significant Levant_CHL ancestry, could it possibly be a Tutsi?

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    The figures for everyone to just have out here:

     












    Quote Originally Posted by drobbah View Post
    There's a 150 bp Congo sample with significant Levant_CHL ancestry, could it possibly be a Tutsi?
    Look at the Y-DNA and their admixture seems completely Levant-Chl. Didn't come with Dinka or Mota-like admixture. Probably a Euro admixed individual since it's so recent.

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    Quote Originally Posted by drobbah View Post
    There's a 150 bp Congo sample with significant Levant_CHL ancestry, could it possibly be a Tutsi?
    He's believed to have Portuguese ancestry:

    When modelling Congo_Kindoki_150BP with qpAdm (Fig. 3B and table S5), we found a fitting model with 85 7% ancestry related to Bantu speakers and 15 7% ancestry related to western Eurasians. This ancestry profile would be consistent with the hypothesis that this individual has Portuguese ancestry, which would fit with the colonial history of the region (44) and the Christian burial of this and other individuals in Kindoki.
    Last edited by blackflash16; 06-12-2020 at 08:02 PM.

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    Quote Originally Posted by Psynome View Post
    There is a very cool insight here from the the authors: that aquatic foragers may have persisted in their habitats for much longer than other forager groups when encountering pastoralist populations in East Africa.
    This is pretty in line with the Roman/Greek historical records mentioning "Ichthyophagi" living along the African side of the Red Sea coast.

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    Seems they also tried to sample some remains from Senegal and Sudan but unfortunately those were not successful.

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    KPL001(Kenya_Kakapel_3900BP) could be indeed CT* or some very deep branch. Would be really interesting to see him on Y-full. The coverage is not that low, 572,074 autosomal SNPs. Other samples with similar coverage have much more detailed haplogroups.

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