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Thread: A Southeast Asian origin for present‐day non‐African human Y chromosomes

  1. #1
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    A Southeast Asian origin for present‐day non‐African human Y chromosomes

    The genomes of present-day humans outside Africa originated almost entirely from a single out-migration~50,000– 70,000 years ago, followed by mixture with Neanderthals contributing ~ 2% to all non-Africans. However, the details of this initial migration remain poorly understood because no ancient DNA analyses are available from this key time period, and interpretation of present-day autosomal data is complicated due to subsequent population movements/reshaping. One locus, however, does retain male-specific information from this early period: the Y chromosome, where a detailed calibrated phylogeny has been constructed. Three present-day Y lineages were carried by the initial migration: the rare haplogroup D, the moderately rare C, and the very common FT lineage which now dominates most non-African populations. Here, we show that phylogenetic analyses of haplogroup C, D and FT sequences, including very rare deep-rooting lineages, together with phylogeographic analyses of ancient and present-day non-African Y chromosomes, all point to East/Southeast Asia as the origin 50,000–55,000 years ago of all known surviving non-African male lineages (apart from recent migrants). This observation contrasts with the expectation of a West Eurasian origin predicted by a simple model of expansion from a source near Africa, and can be interpreted as resulting from extensive genetic drift in the initial population or replacement of early western Y lineages from the east, thus informing and constraining models of the initial expansion.

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     ATjunior1 (09-01-2021),  Robert1 (09-01-2021)

  3. #2
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    Northwest USA
    British & Irish
    Y-DNA (P)
    R1b>L513>A7> BY11186
    mtDNA (M)
    Y-DNA (M)
    mtDNA (P)

    Scotland Wales Ireland England Germany Netherlands
    Welcome to Anthrogenica, Ylang-Ylang! Thanks, that is an interesting link.
    Estimated ancestry after reviewing, 23&Me, FTDNA My Origins, Living DNA and known family history:
    33% English, 27% Scottish, 18% Welsh, 18% Irish, 4% German/Netherlands

    Y-DNA leads to Isle of Skye, Scottish Highlands: R1b>M343>L278>L754>L389>P297>M269>L23>L51>L151/L11>P312>Z290>L21/M529>DF13>L513/DF1>S5668>A7>Z21253> S7834 > S7828 > BY11203 > BY11186 (about 320-550 years old)

    MTDNA leads to Glamorgan, South Wales: K1a4a1f

  4. The Following User Says Thank You to Robert1 For This Useful Post:

     Ylang-Ylang (09-01-2021)

  5. #3
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    According to serial founder model, the earliest-branching non-African lineages are expected to expand and be present closer to Africa (a), but instead have expanded in East or Southeast Asia (b). Simplified Y tree is shown as reference for colours
    Attached Images Attached Images
    Last edited by Ylang-Ylang; 09-01-2021 at 07:33 PM.

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     ATjunior1 (09-01-2021)

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  8. The Following 3 Users Say Thank You to Q-M242-is-Papuan-related For This Useful Post:

     sheepslayer (09-02-2021),  Shuzam87 (09-03-2021),  Ylang-Ylang (09-01-2021)

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