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Admixture in South African Afrikaners
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I teased this yesterday, and I don’t like to do that, so I’m going to put up a quick post. Something more thorough will go up on the Family Tree DNA blog at some point soon. Basically I have heard through the grapevine that something on the genomewide patterns of Afrikaners would be published “soon” in the fall of 2012, but that hasn’t happened. So a few weeks ago I went looking in the Family Tree DNA database, and extracted individuals who stated that both parents were born in South Africa. Twelve of those had more than 90 percent European ancestry. So it is likely that these individuals are either Afrikaner or non-Afrikaner South African whites. I’ll hold off on the admixture results until the Family Tree post, but visual inspection made it clear that most of them they had non-European ancestry. American whites and Europeans generally have no non-West Eurasian/North African ancestry, with the exception of some Spaniards, who have small Sub-Saharan segments, probably mediated through the Moors. Many of these individuals had affinities at low levels to Khoisan, South Asians, Southeast Asians, and West Africans. These are as it happens the non-European groups who contributed ancestry to the Cape Coloureds.

So as a preview, below are MDS plots of various populations. I filtered the SNPs down to ~150,000.

SA1

Compared to the British and Polish Northern European samples all but one of the South Africans is shifted toward Africans. One of the individuals is probably Xhosa, and a few Cape Coloured. But the others are over 90 percent European, in particular Northern European.

SA2

Here you see both South and Southeast Asian admixture in these individuals, by and large. A few individuals now overlap with the Northern European British/Polish cluster. They had lower levels of Asian ancestry.

SA3

Now you see that the South African whites are clearly like the British, not the Poles or Spaniards, but skewed in the direction of non-European ancestry. This makes sense since the parent populations of Afrikaners, French Hugenonts, Dutch, and Germans, are more like the British. One of the individuals fits nicely into the British cluster. I presume that this is a person of non-Afrikaner British background.

Around 60 percent of whites are Afrikaner in South Africa (there is some intermarriage obviously as well). This sample seems skewed toward that subset, so one has to question the ascertainment here. Perhaps people who got their DNA tested had suspicions or questions about their ancestry? This is plausible. But on the other hand the fraction of non-European ancestry is pretty much on average what the genealogical estimates of ~5 percent are. And, it’s relatively evenly spread through the white sample here that has admixture, indicating it probably dates to the founding generations of the Afrikaner ethnic group, which until recently has been endogamous.

More later.

Note: Click images for larger version.

 
• Category: Race/Ethnicity, Science 
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  1. syonredux says:

    “American whites and Europeans generally have no non-West Eurasian/North African ancestry,”

    Is there any data on White Canadians, Australians, and New Zealanders ?

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  2. Jefferson says:

    “Is there any data on White Canadians, Australians, and New Zealanders ?”

    You mean what percentage of people who self identify themselves as White in Canada, Australia, and New Zealand have a Maori, Aboriginal, or Eskimo ancestor in their family tree ?

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    • Replies: @syonredux

    “Is there any data on White Canadians, Australians, and New Zealanders ?”

    You mean what percentage of people who self identify themselves as White in Canada, Australia, and New Zealand have a Maori, Aboriginal, or Eskimo ancestor in their family tree ?
     
    Yes. I'm curious to see the rates of indigenous admixture in White Canadians, White Australians, and White New Zealanders. The impression that I have is that the White admixture rates in those countries are about the same as the rate in the USA, but I don't know for sure.
  3. Bob says:

    ” Something more thorough will go up on the Family Tree DNA blog at some point soon. ”

    Razib Kahn – Are you starting starting to contribute to the blog At FTDNA? Should we check it periodically? I see you were their spokesman (?) at I4GG.

    Read More
  4. syonredux says:
    @Jefferson
    "Is there any data on White Canadians, Australians, and New Zealanders ?"

    You mean what percentage of people who self identify themselves as White in Canada, Australia, and New Zealand have a Maori, Aboriginal, or Eskimo ancestor in their family tree ?

    “Is there any data on White Canadians, Australians, and New Zealanders ?”

    You mean what percentage of people who self identify themselves as White in Canada, Australia, and New Zealand have a Maori, Aboriginal, or Eskimo ancestor in their family tree ?

    Yes. I’m curious to see the rates of indigenous admixture in White Canadians, White Australians, and White New Zealanders. The impression that I have is that the White admixture rates in those countries are about the same as the rate in the USA, but I don’t know for sure.

    Read More
  5. This is personally interesting since my mother is an Afrikaaner of Hugenot stock. About 10 years ago, in the course of doing a TV film that touched on race, I had Mark Shriver test me on the current panel of AIMs. To my surprise, he identified 96% European, 4% Amerind — but no African. The Amerind is almost certainly wrong since my ancestry is, as far as I know, resolutely Old World, but it made for an odd sequence as, after detailing my family history, the porosity of South Africa’s racial barriers, alluding to my mother’s olive skin and dark curls, and mine, etc, we opened the envelope for the Big Reveal and, well, nothing much. Question, Razib: is it likely that loadsa SNPs will alter this result or must I just accept that my maternal ancestors always toed the racial line?

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  6. #3, i will contribute now and then. i don’t know if it will be regular.

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  7. s it likely that loadsa SNPs will alter this result or must I just accept that my maternal ancestors always toed the racial line

    1) AIMs are coarse. i’m pretty sure that they were not well ascertained for khoisan ancestry, which is just as common in these samples as non-khoisan ancestry

    2) if there is amerind ancestry i wouldn’t be surprised if it’s picking up a mixed south and southeast asian signal. before genome-wide analysis the extent of south asian admixture into cape coloureds was not widely understood.

    i am about 90% confident from these data that most afrikaners will show evidence of low levels of admixture, because they were an endogamous population.

    OTOH, the phenotypic traits you mention could just as likely have been south french. the southwest was the heartland of french protestantism by the end (though french protestants survived in the massif central).

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  8. Jefferson says:

    “Yes. I’m curious to see the rates of indigenous admixture in White Canadians, White Australians, and White New Zealanders. The impression that I have is that the White admixture rates in those countries are about the same as the rate in the USA, but I don’t know for sure.”

    Sarah Palin’s kids are 1/16 Eskimo because her husband Todd is 1/8 Eskimo. I wonder if Sarah’s husband and kids self identify themselves as White ? My guess would be yes they self identity themselves as White because they are Conservative. People with Caucasian phenotypes that try to take advantage of affirmative action programs by claiming to be People Of Color, tend to be politically Liberal like Elizabeth Warren.

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  9. […] Admixture in South African Afrikaners — from razib. […]

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