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Thread: Ancient West African foragers in the context of African population history

  1. #1
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    Ancient West African foragers in the context of African population history

    A new paper from Nature: (Lipson et. al)

    "Our knowledge of ancient human population structure in sub-Saharan Africa, particularly prior to the advent of food production, remains limited. Here we report genome-wide DNA data from four children—two of whom were buried approximately 8,000 years ago and two 3,000 years ago—from Shum Laka (Cameroon), one of the earliest known archaeological sites within the probable homeland of the Bantu language group. One individual carried the deeply divergent Y chromosome haplogroup A00, which today is found almost exclusively in the same region. However, the genome-wide ancestry profiles of all four individuals are most similar to those of present-day hunter-gatherers from western Central Africa, which implies that populations in western Cameroon today—as well as speakers of Bantu languages from across the continent—are not descended substantially from the population represented by these four people. We infer an Africa-wide phylogeny that features widespread admixture and three prominent radiations, including one that gave rise to at least four major lineages deep in the history of modern humans."
    Last edited by alchemist223; 01-23-2020 at 01:23 AM.
    MDKA: Robert Boulay, b. 1631, Réveillon, Orne, France
    Y-DNA: R1b-U152 > L2 > Z367 > Z34 > Z33 > BY164497> BY3604

    Maternal Y-DNA: J2a-M67 > Z1847 > Y4036 > Z467 > Z447> L210

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  3. #2
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    I've added these samples from the paper to the Global25 datasheets. But I wouldn't recommend any sort of deep ancestry modeling like in the paper.

    CMR_Shum_Laka_3000BP:I10873
    CMR_Shum_Laka_3000BP:I10874
    CMR_Shum_Laka_8000BP:I10871
    CMR_Shum_Laka_8000BP:I10872
    Cameroon_Aghem:TK-KV-NKA0027
    Cameroon_Aghem:TK-KVWUM001
    Cameroon_Aghem:TK-KVWUM002
    Cameroon_Aghem:TK-KVWUM003
    Cameroon_Aghem:TK-KVWUM005
    Cameroon_Aghem:TK-KVWUM006
    Cameroon_Aghem:TK-KVWUM007
    Cameroon_Aghem:TK-KVWUM008
    Cameroon_Aghem:TK-KVWUM009
    Cameroon_Aghem:TK-KVWUM010
    Cameroon_Aghem:TK-KVWUM011
    Cameroon_Aghem:TK-KVWUM012
    Cameroon_Aghem:TK-KVWUM013
    Cameroon_Aghem:TK-KVWUM014
    Cameroon_Aghem:TK-KVWUM015
    Cameroon_Aghem:TK-KVWUM016
    Cameroon_Aghem:TK-KVWUM017
    Cameroon_Aghem:TK-KVWUM018
    Cameroon_Aghem:TK-KVWUM019
    Cameroon_Aghem:TK-KVWUM020
    Cameroon_Aghem:TK-KVWUM021
    Cameroon_Aghem:TK-KVWUM022
    Cameroon_Aghem:TK-KVWUM023
    Cameroon_Aghem:TK-KVWUM024
    Cameroon_Aghem:TK-KVWUM025
    Cameroon_Aghem:TK-KVWUM026
    Cameroon_Aghem:TK-KVWUM027
    Cameroon_Aghem:TK-KVWUM028
    Cameroon_Bafut:CMF-BAK-074
    Cameroon_Bafut:TK-KVBAF003
    Cameroon_Bafut:TK-KVBAF009
    Cameroon_Bafut:TK-KVBAF011
    Cameroon_Bafut:TK-KVBAF012
    Cameroon_Bafut:TK-KVBAF030
    Cameroon_Bafut:TK-KVBAF032
    Cameroon_Bafut:TK-KVBAF045
    Cameroon_Bafut:TK-KVBAF052
    Cameroon_Bafut:TK-KVBAF081
    Cameroon_Bafut:TK-KVBAF082
    Cameroon_Bakoko:CAM-PYKL-222
    Cameroon_Bangwa:CAM-PYKL-244
    Cameroon_Bangwa:CMF-BAK-001
    Cameroon_Mbo:CAM-MBO-002
    Cameroon_Mbo:CAM-MBO-010
    Cameroon_Mbo:CAM-MBO-012
    Cameroon_Mbo:CAM-MBO-013
    Cameroon_Mbo:CAM-MBO-015
    Cameroon_Mbo:CAM-MBO-019
    Cameroon_Mbo:CAM-MBO-022
    Cameroon_Mbo:CAM-MBO-036
    Cameroon_Mbo:CAM-MBO-037
    Cameroon_Mbo:CAM-MBO-038
    Cameroon_Mbo:CAM-MBO-039
    Cameroon_Mbo:CAM-MBO-040
    Cameroon_Mbo:CAM-MBO-042
    Cameroon_Mbo:CAM-MBO-046
    Cameroon_Mbo:CAM-MBO-051
    Cameroon_Mbo:CAM-MBO-052
    Cameroon_Mbo:CAM-MBO-083
    Cameroon_Mbo:CAM-MBO-089
    Cameroon_Mbo:CAM-MBO-093
    Cameroon_Mbo:CAM-PYKL-047
    Cameroon_Mbo:CMF-BAK-022

    Same links as always...

    https://bga101.blogspot.com/2019/07/...-global25.html
    Last edited by Generalissimo; 01-23-2020 at 06:56 AM.

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  5. #3
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    That's good. That's good.

    Hopefully that's a sign old enough Egypt samples are not beyond reach.

  6. #4
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    Quote Originally Posted by Generalissimo View Post
    I've added these samples from the paper to the Global25 datasheets. But I wouldn't recommend any sort of deep ancestry modeling like in the paper.
    Because we lack the requisite tools/expertise or because you think it's fundamentally unsound?

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  8. #5
    How can we explain the lack of haplogroup E ?

  9. #6
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    Quote Originally Posted by Nebro View Post
    How can we explain the lack of haplogroup E ?
    To begin with there are only 3 Y results, so even if they had a good deal of E it could have been missed by chance.

    If their model is correct the Shum Laka boys were a mix of ancestral West African and ancestral Central African, with maybe some additional ghost ancestry or other. Nowadays West Africans have predominantly E1b1a1-M2, but that needn't have always been the case - E-M2 could have replaced other haplogroups over the course of the Holocene. The mixture between these ancestries would have happened more than 8000 years ago, so there's no reason it should have involved male bias on the West African side like in recent farmer-forager interactions. A00 might itself be West African, coming from the ghost element. B might be Central African, but it could belong to the Out-of-Africa-related branch instead, and just didn't sent any branches out of Africa. Who knows.

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