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Thread: Do the South Sudanese like the Dinka have West Eurasian/North African admixture?

  1. #11
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    Quote Originally Posted by thejkhan View Post
    No doubt much of the West Eurasian clades of E owe their origin to Ibero-Maurusians (ANA). That's because some ANA made it to Levant and assimilated into the Natufians.

    E clades found in large numbers in Middle East, Near East or Europe are probably all associated with the spread of farming, along with the Natufian component that the farmers carried.

    That's why I am speculating that E-V22 was part of a reverse migration back into North East Africa, followed by expansion towards SSA.
    Only E-M35 subclades are really associated with North African or Southwest Asian autosomal patterns. All the other E's are rather non-MENA.

    As for E-V22, I think it is an Afro-Asiatic haplogroup. TMRCA is within the range of the Afro-Asiatic language family. Hence, why I think it is exogenous (if you go back far enough) to South Sudan.

  2. #12
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    Quote Originally Posted by NetNomad View Post
    Yeah, but the 'original'/first population that had E-V22 must have been autosomally similar to the IberoMaurusians (clustering somewhere around North Africans).

    During the Green Sahara E-M78 spread all over the place.

    Also, some Nilotic A-M13 lineages spread to the Mediterranean (multi-directional geneflow):

    https://www.yfull.com/tree/A-M13/
    Hmm I would say the original M78 population was certainly similar to Iberomaurusians, as the Taforalt samples are close to the M78 TMRCA. I wouldn't assume the same for early V22 carriers, although it's not impossible since there were still Taforalt-like groups in North Africa at that time as seen in the IAM samples.

    Quote Originally Posted by thejkhan View Post
    No doubt much of the West Eurasian clades of E owe their origin to Ibero-Maurusians (ANA). That's because some ANA made it to Levant and assimilated into the Natufians.

    E clades found in large numbers in Middle East, Near East or Europe are probably all associated with the spread of farming, along with the Natufian component that the farmers carried.

    That's why I am speculating that E-V22 was part of a reverse migration back into North East Africa, followed by expansion towards SSA.
    I support the idea that V22 is related to the Neolithic settlement of Egypt, either entering from West Asia as pre-V22, followed by a migration of V22 out of Egypt, or with fully formed V22 entering Egypt with the spread of the Neolithic. V22 shares an ancestor (Z1919) with European V13, so a Levantine origin of at least Z1919 certainly makes sense to explain its descendants moving to Europe and the Nile Valley.

    V3262, one of the basal V22 branches, is rare in the YFull database, only reported in a few Saudis and an Eritrean. Considering the lack of Egyptian and East African samples, I wouldn't be surprised if at least this sublineage traces back to Neolithic Egypt/Sudan. The shared lineages between Saudis and Horners would be explained by more recent gene flow since the Bronze Age.

    And to address the topic: M78 in South Sudan is almost certainly associated with North African gene flow. But M35 is complicated overall, with certain branches apparently migrating in/out of Africa multiple times. It's also likely Paleolithic North Africans among whom M35 seems to have originated were themselves a bit more Eurasian than African.

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  4. #13
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    Quote Originally Posted by NetNomad View Post
    Do the South Sudanese like the Dinka have West Eurasian/North African admixture?
    I guess it depends how far back we're talking: Eurasian admixture for nilotes is mostly negligible on modern runs especially on upper Ks (minus the odd few exceptions).

    Though on lower Ks or when ancients are included, it's not uncommon to see a minor non-negligible layer of Eurasian affinity for upper-nilotic pops (Hodgson, 2014), (Tiskoff, 2009), (Mulindwa, 2017), (Loosdrecht, 2018)...


    IMO this minor ~<5% Eurasian affinity among nilotes might be mostly attributed to inverse green-saharan migrations from Ancient North-African HGs migrating southward. This is based on the premise of upper-nilotic pops like the Dinka being spread across the southern range of the sahara before migrating to present day S.Sudan and adjacent regions:

     
    Ancient watercourses and biogeography of the Sahara explain the peopling of the desert (Drake, 2011):

    "..We hypothesize that the other economic revolution that occurred in the Sahara at approximately the same time was the southward spread of the bow and arrow. North African hunters would have observed the new abundance of large and unfamiliar land mammals to the south, notably elephant and giraffe. In a dispersal inverse to that of the Nilo-Saharans, they would have been attracted southward to hunt these animals with the bow and arrow. The “Ounanian” of Northern Mali, Southern Algeria, Niger, and central Egypt at ca. 10 ka is partly defined by a distinctive type of arrow point (37). These arrowheads are found in much of the northern Sahara (Fig. 3) and are generally considered to have spread from Northwest Africa. This view is supported by the affinity of this industry with the Epipalaeolithic that also appears to have colonized the Sahara from the north (41)."




    Fig. 3)

    • Some of the above Ounanian and Barbed bone sites are adjacent or overlap (e.g. Nabta Playa, NW Chad basin). This might translate that there was some degree of introgression between ANA and NS HGs



    This range of non-SSA admixture correlates nicely with the Eurasian affinity that nilotes share with ancient Natufians -- it's usually ~3-5% with the LBK and Lazardis samples.

    You can see this on ancient calcs for nilotes with samples uploaded on GEDmatch (Kit#s posted here)


    What are your thoughts here:

    • Could this be OoA/BE shared-drift with rich Ancient-East-African pops?
    • Some other kind of ADMIX flaw?
    • Remnants of a common ancestor shared by Iberomaurusians and Natufians which may have lived somewhere in the Maghreb during the Epipalaeolithic?


    From what I recall, nilotes like the Dinka typically don't have any non-negligible horner/coptic/cushitic-like ancestry, they also don't have any admixture from recent ANA samples (TOR, IAM, KEB ) -- so it's perplexing why they're getting this ~<5% minor Natufian
    Last edited by Angoliga; 02-22-2019 at 03:58 PM. Reason: Meant to mention the *Epipalaeolithic not the Epipleistocene
    .... .. I have spoken."

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