I can't believe this thread is still open..
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I can't believe this thread is still open..
Let's add more fuel!
The History of African Gene Flow into Southern
Europeans, Levantines, and Jews
Previous genetic studies have suggested a history of sub-Saharan African gene flow into some West Eurasian populations after the initial dispersal out of Africa that occurred at least 45,000 years ago. However, there has been no accurate characterization of the proportion of mixture, or of its date.
We analyze genome-wide polymorphism data from about 40
West Eurasian groups to show that almost all Southern Europeans have inherited 1%–3% African ancestry with an average mixture date of around 55 generations ago, consistent with North African gene flow at the end of the Roman Empire and subsequent Arab migrations.
Levantine groups harbor 4%–15% African ancestry with an average mixture date of about 32 generations ago, consistent with close political, economic, and cultural links with Egypt in the late middle ages. We also detect 3%–5% sub-Saharan African ancestry in all eight of the diverse Jewish populations that we analyzed.
For the Jewish admixture, we obtain an average estimated date of about 72 generations. This may reflect descent of these groups from a common ancestral population that already had some African ancestry prior to the Jewish Diasporas.
http://genetics.med.harvard.edu/reic...rjani_PLOS.pdf
Doesn't seem the (rather miniscule I dare say) rates of West African admixture in many parts of South Europe is Neolithic as is often claimed, but rather a legacy of the Roman Empire.
Based on Dodecad K12b samples:
https://i.hizliresim.com/qJJ9Qq.jpg
https://en.wikipedia.org/wiki/Geneti...ican_influenceQuote:
In terms of autosomal DNA, the most recent study regarding African admixture in Iberian populations was conducted in April 2013 by Botigué et al. using genome-wide SNP data for over 2000 individuals, concluding that Portugal and Spain hold significant levels of North African ancestry. Estimates of shared ancestry averaged from 4% in some places to 10% in the general population, the populations of the Canary Islands outputted up to 20% of shared ancestry with north africans, although the Canary islands are a spanish exclave located in the african continent, and thus this output is not representative of the iberian population; these same results did not exceed 2% in other western or southern European populations.[1][31][32] However, contrary to past autosomal studies and to what is inferred from Y-Chromosome and Mitochondrial Haplotype frequencies(see below), it does not detect significant levels of Sub-Saharan ancestry in any European population outside the Canary Islands. Indeed, a prior 2011 autosomal study by Moorjani et al. found Sub-Saharan ancestry throughout Europe at ranges of between 1-4%, "the highest proportion of African ancestry in Europe is in Iberia (Portugal 4.2±0.3% and Spain 1.4±0.3%), consistent with inferences based on mitochondrial DNA and Y chromosomes and the observation by Auton et al. that within Europe, the Southwestern Europeans have the highest haplotype-sharing with North Africans."[25][11][29] A similar 2014 study by Lazaridis et al. found an average African admixture of 13.8% (12.6% Mozabite and 1.2% Mbuti/Yoruba) in the Y-DNA markers of the Spanish population, suggesting that gene flow from Sub-Saharan and North African populations has occurred in the Spanish sample.[33]
On Gedmatch they don't score 10%. I have like 8 Spanish samples and on Dodecad K7b the most African of them is 1.7%.
Admix Results (sorted):
# Population Percent
1 Atlantic_Baltic 60.67
2 Southern 25.62
3 West_Asian 9.67
4 African 1.7
5 South_Asian 1.47
6 Siberian 0.87
By contrast, this is a half-East African half-Russian girl (no idea what kind of EA, she was adopted in Canada):
Admix Results (sorted):
# Population Percent
1 Atlantic_Baltic 35.21
2 African 24.83
3 Southern 23.5
4 West_Asian 10.51
5 Siberian 3.34
6 South_Asian 2.01
7 East_Asian 0.59
Mixed Mode Population Sharing:
# Primary Population (source) Secondary Population (source) Distance
1 51.9% Ethiopian_Jews (Behar) + 48.1% Mordovians (Yunusbayev) @ 3.51
2 52.5% Ethiopians (Behar) + 47.5% Mordovians (Yunusbayev) @ 4
3 50.6% Mordovians (Yunusbayev) + 49.4% Somali (Dodecad) @ 4.03
4 52.7% Ethiopian_Jews (Behar) + 47.3% Russian (HGDP) @ 4.44
5 65.6% Romanians (Behar) + 34.4% MKK30 (Dodecad) @ 4.45
6 52.7% Ethiopian_Jews (Behar) + 47.3% Russian_B (Behar) @ 4.49
7 65.7% Bulgarians (Yunusbayev) + 34.3% MKK30 (Dodecad) @ 4.52
8 53.3% Ethiopians (Behar) + 46.7% Russian (HGDP) @ 4.55
9 67% N_Italian (Dodecad) + 33% Sandawe (Henn) @ 4.57
10 53.3% Ethiopians (Behar) + 46.7% Russian_B (Behar) @ 4.67
An Algerian:
Admix Results (sorted):
# Population Percent
1 Southern 48.51
2 Atlantic_Baltic 23.87
3 African 20.98
4 West_Asian 5.35
5 Siberian 0.96
6 South_Asian 0.34
Single Population Sharing:
# Population (source) Distance
1 Algerian (Dodecad) 4.22
2 Moroccan (Dodecad) 9.6
3 Moroccans (Behar) 9.94
4 Mozabite (HGDP) 11.08
5 Egyptans (Behar) 24.35
Some Sicilians, Calabrians and Greeks have sickle cell anemia. If you want to know the awful fact of the day. Somewhat oddly Iberia does not have sickle cell. I would have expected Iberians to have higher nig nog admixture than Italians and especially Greeks.