Recent gene flow from Africa and Near East into Europe

[evon]

http://eurogenes.blogspot.com.au/2013/06/recent-gene-flow-from-africa-and-near.html


In this study Botigué et al. take a dual approach to confirm North African, as well as Near Eastern and Sub-Saharan, admixture in Europe. First they use the ADMIXTURE algorithm to estimate overall African and Near Eastern gene flow into Europe, and then fastIBD to detect relatively recent genetic contacts via shared Identity-by-Descent (IBD) segments of over 1.5cM.

http://img9.imageshack.us/img9/5260/ssananeibdmapsfig2.png

[gregorius]

it seems that the european borders are growing everyeayr :laugh:

[gregorius]

in three years north africa will be on the european map :laugh:

[Sikeliot]

Well that's not a surprise. North African and SSA is highest in Iberia (especially Canaries), Near Eastern highest in southern Greece, Crete, and eastern Sicily.

[singular]

I can't say it looks wrong. Although if they took random samples, I bet there would be a big purple stain all over Western Europe.

[Peyrol]

Not surprising maps.

[RussiaPrussia]

make a same map for east Asian gene flow

[Black Wolf]

^Yes I agree it would be nice to see a study done showing the shared IBD between Europeans and Asians/Siberians.

[evon]

http://i39.tinypic.com/2pyb8uw.jpg

Notice the Occidental Sahara numbers in the Norwegian samples, weird..i wonder where in Norway these samples are from..

[safinator]

Interesting but not much surprising.

[Roy]

Nothing new, really. Iberian are niggers of Europe.


just kidding

[RussiaPrussia]

http://i39.tinypic.com/2pyb8uw.jpg

Notice the Occidental Sahara numbers in the Norwegian samples, weird..i wonder where in Norway these samples are from..

viking looting

[Mans not hot]

How does it feels like to be Arab in denial, Aflieb? :lol:

[Leon_C]

I would have thought there would be a big blob of SSA in London and Paris lol

[Lábaru]

Can someone explain these maps in %-1-100 for Spain? I do not understand a shit what these numbers mean.

[evon]

viking looting

Very unlikely...More likely its via another European state with elevated levels during the 12th century or later..

[Insuperable]

@evon

I can't find those three maps in your opening post in a study of Botigué et al. Did Davidski made them?
There were eight samples from Yugoslavia as stated in their study. It does not specify from which specific country are they from. I do not understand why on those maps out of all Yugoslav countries Croatia is highlighted. Is that an approximation map to show correlation of the supposed admixture along Mediterranean coastline or not?

[evon]

@evon

I can't find those three maps in your opening post in a study of Botigué et al. Did Davidski made them?
There were eight samples from Yugoslavia as stated in their study. It does not specify from which specific country are they from. I do not understand why on those maps out of all Yugoslav countries Croatia is highlighted. Is that an approximation map to show correlation of the supposed admixture along Mediterranean coastline or not?

I dont have access to the study from home, but since Dienekes also published it i assume its part of the original data:
http://dienekes.blogspot.co.at/2013/06/ibd-sharing-between-iberians-and-north.html

[Insuperable]

I dont have access to the study from home, but since Dienekes also published it i assume its part of the original data:
http://dienekes.blogspot.co.at/2013/06/ibd-sharing-between-iberians-and-north.html

Don't know if it is full research paper, but it is not there unless it is taken based on some data.
http://www.pnas.org/content/suppl/2013/05/30/1306223110.DCSupplemental/sapp.pdf

[evon]

Don't know if it is full research paper, but it is not there unless it is taken based on some data.
http://www.pnas.org/content/suppl/2013/05/30/1306223110.DCSupplemental/sapp.pdf

if you have gmail you can just log into the comment field and ask either one of them on their blog's...

[MfA_]

This is pretty much bs for Anatolia-Caucasus + Sicily not a single sample been taken.. Not to mention only 1 sample for Cyprus and 2 for Greece..

[mr. logan]

Subsaharan negroids in Mongolia and China. North africans in northern Russia. And near eastern with high measurable values all over Europe.
Bollocks.

[Gaston]

Seems like Near Eastern and North African flow didn't just stay in Southern Europe. There is shared IBD even in central and northern Europe, although a lot less and not everywhere.
Somebody pointed that Hungary looks even more influenced by North African flow than France is here.

[Also]

@evon

I can't find those three maps in your opening post in a study of Botigué et al. Did Davidski made them?

The first two of them are in the original study, the third one is the Figure S7 on the Supplementary Information file you linked.


Can someone explain these maps in %-1-100 for Spain? I do not understand a shit what these numbers mean.

They estimated Southwestern Europeans to have between 4%-20% of their genomes belonging to an ancestral North African cluster.

The original article adresses dieneke's critics.

i)The study does not assume that the source population are unadmixed to estimate the results.
ii)Although IBD sharing does not indicate the direction of gene flow, they observed that the highest IBD sharing between Iberians and North Africans are with North Africans population who lack significant european admixture, for example, Andalucians and Tunisians have a significant IBD sharing but Tunisians have negligible european ancestry. So it supports the idea that the gene flow was from North Africa to Europe rather than from Europe to North Africa.

According to the study Basques are an exception and have similar levels of admixture as other europeans.