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Using Hg I to Track Prehistoric Migrations

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  • Using Hg I to Track Prehistoric Migrations

    I am reposting this here from another forum:

    Greetings everyone,

    I recently took a "deep" (subclade level) SNP test from DNAHeritage. I typed as I1b2.**

    **(This was before the proposed changes in HG I nomenclature. The proposed changed term for my subclade is I1b1a, I believe. Confusingly, they also proposed changing the former I1* to I1b2, and the former I1c to I1b2a. I want to be clear that I am positive at M170, P37 and M26).

    My direct male ancestor is from the mountains of north Calabria in Italy. From what I have read online, 0.6 % of Calabrians type as I do, and around 1% of Italians. Over 40% of Sardinians and 30% of Castilians type the same.

    I'd be happy to answer any questions about my ancestry or the test. I just ordered a 43 marker STR test, so will hopefully have some more data very shortly.

    In the meantime, I'd like any Hg I aficionados to help me in going through some models and exercises and theories.

    Here goes:

    My subclade is so unique that it presents a fascinating story. It is not found east of the Appennines in Italy. It is present in the following countries only and in this order of frequency: Sardinia (Italy); Spain (Castile and Basque Country); France; Ireland; Italy (mainland); Sweden and Portugal. It does not exist anywhere else.

    I jokingly call I1b2 "Tyrrenian Modal Haplotype" because almost every country where it is present touches the Tyrhenian / Western Mediterranean.

    The theory, correct me if I am wrong, is that Hg I originated (mutated to more or less current form) in the Balkans, near modern Croatia.

    The I1b2 part is also clear. The paper I read indicates that some Hg I carriers headed west before the Last Glacial maximum and were stranded alongside the R1b carriers in the (theoretical) Iberian refuge area.

    Many people accept the "ethnic" terms of the pre-LGM R1b carriers as "Aurignacians" and the pre-LGM I carriers as "Gravettians."

    Who were these (Gravettian) I1b2 carriers who headed west? Were they conquerors of the Aurignacs? Or slaves? Were they early merchants? Or just men who married into the Aurignacian area?

    Either way, it appears the I1b2 carriers clearly waited out the LGM in Iberia/Cantabria/S. France, and then populated Sardinia, where genetic drift or bottlenecking made them a significant plurality.

    What is fascinating, is that I1b2 appears to be the sidecar of the R1b motorcycle. In every country where R1b is the heavy majority, I1b2 seems to represent a tiny fraction of that populace: I1b2 is more or less correlated to an R1b supermajority.

    Another mystery: how did I1b2 get to mainland Italy? The Sardinians domesticated the grape, and the earliest tribes in my ancestors' region were the Oenotri ("grape growers") and the Itali ("inhabitants of the land of the life giving calf"). Makes you wonder whether the Oenotri were Sardinian colonists.

    (As a side note/mystery, most historians agree that Sardinians traveled to modern-day Lebanon and Egypt and Israel. Yet there is no I1b2 in either of the three.)

    Even more of a mystery is how it reached Sweden. The authors of the paper I read seem to think some of the earliest settlers of Scandinavia bore I1b2.

    I'd love to hear your thoughts and pet theories. If you would like the links to any of my information, I'd be happy to provide them.

    Thanks in advance.

  • #2
    You haplogroup does indeed sound fairly unique, and I agree tracking it may help track the peopling of Western Europe.

    As invaders, the Western Gravettians would likely only have children with those in the Iberian refuge if they (the Gravettians) were some sort of dominant elite. But I suppose it depends on whether your model of ancient societies is based on raids and forcible overlording or peaceable bride exchanges...