African admixture in Southern Europeans

**Charlie Bass** · 08-06-2012, 06:32 PM

Europeans are mainly the descendants of Neolithic farmers from the Near East and native European Mesolithic hunter-gatherers, with the Mesolithic component peaking in Northeastern Europe. Moreover, all Europeans have prehistoric East Asian admixture, but Northern Europeans have more of it than Southern Europeans. However, Southern Europeans have recent Sub-Saharan African ancestry that Northern Europeans lack.

Source

Inference of human demographic parameters using haplotype patterns from genome-wide SNP data. K. E. Lohmueller1,2, A. Auton2, C. D. Bustamante2, A. G. Clark1 1) Dept Mol Biol and Genetics, Cornell Univ, Ithaca, NY; 2) Dept Biol Stats and Comp Biol, Cornell Univ, Ithaca, NY.

Accurate inference of human demographic history from genetic data is essential for identification of single nucleotide polymorphism (SNP) association with disease and for inference of natural selection. Haplotype diversity and haplotype sharing carry additional demographic information to that obtainable from SNP frequency spectra, and so we propose a novel method using haplotype summary statistics to fit demographic models to genome-wide SNP data. We divide the genome into 0.25 cM windows and for each we tabulate the number of distinct haplotypes and the frequency of the most common haplotype. We summarize the data by the genome-wide joint distribution of these two statistics. Coalescent simulations are then used to evaluate whether different demographic models are compatible with the observed data. Application of our method to simulated data shows that our method can reliably infer parameters from complex demographic models (such as bottlenecks) and is relatively robust to the levels of SNP ascertainment bias found in many genome-wide datasets. We have applied our method to data collected by the International HapMap Consortium and find that a bottleneck model best fits the CEU population. We have also analyzed a large dataset consisting of Affymetrix 500k data from ~2,900 individuals with ancestry from Taiwan, Japan, India, Mexico and many European countries. Since this dataset includes ~2,300 European individuals, we are able to study haplotype patterns at a fine scale within Europe. Interestingly, we find that within Europe there is a south-to-north gradient with decreasing levels of haplotype diversity moving north, consistent with south to north migrations. We also find that the southwestern European sample has higher haplotype diversity than the southeastern European sample. Additionally, a higher proportion of haplotypes are shared between the southwestern European sample and the Yoruba sample than between southeastern European sample and the Yoruba sample. These two patterns are consistent with recent admixture across the Mediterranean from Northern Africa.

Pure Southern Europeans=RIP

**Charlie Bass** · 08-06-2012, 06:38 PM

Mr.Bass has noticed that exotic Southern Europeans tend to lean toward North Africa not Middle East.Mr.Bass's observation fits the genetic studies.

**~~Libertas~~** · 08-06-2012, 06:38 PM

It may or may not be true but we still don't need hordes of West African hawkers infesting the streets of Southern Europe.

**SilverKnight** · 08-06-2012, 06:41 PM

This doesn't necessarily mean that Southern, or Northern Europeans aren't 'pure'
It's just basically ancient genes reflected, not recent. There are also Europeans who have have ancient West and south west Asian ancestry. For instance my African, Native is recent, but then my South west Asian might not be that recent.

**Gaijin** · 08-06-2012, 06:53 PM

Originally Posted by Charlie Bass

Mr.Bass has noticed that exotic Southern Europeans tend to lean toward North Africa not Middle East.Mr.Bass's observation fits the genetic studies.

Southern Europeans tend to lean to North Africa or Middle East you say?

Surprisingly, Southern European never cluster with the North Africans, but with their counterpart Europids.

**Lábaru** · 08-06-2012, 07:06 PM

We are all mixed with Asian and African DNA but a 1-2% not is a nightmare, is acceptable.

**SilverKnight** · 08-06-2012, 07:09 PM

Originally Posted by SouthernEuro

Your thesis is based on a merely blog...
Oh look, a jigaboo trying to the pierce Southern Europeans.

Somebody ban this negro, already.

People can't just be banned for posting something you don't agree with, unless he/she has offended a member or staff.

**SilverKnight** · 08-06-2012, 07:16 PM

Originally Posted by SouthernEuro

Since when are non-Europeans allowed in Apricity?

Charlie Bass is not your typical user.
He's a Negoid, trolling around with a sense of sarcasm.

Just browse his posts.

How about we give him a chance and see how he behaves forward like a troll or not ? His reputation is horrid as I see. But is up to the staff/admins to delegate and decide what do do with him.

**SilverKnight** · 08-06-2012, 07:20 PM

Doesn't seem legit, Iceland, Estonia ? wtf

**~~Dacul~~** · 08-06-2012, 07:21 PM

Romanians do not have any african admixture.
Some romanians have some south indian admixture,but under 10%.
South indian does not mean gypsies,gypsies are a group of people of mostly south India genetics who are most of them uneducated,but they can not compare to south indians.Romanians have south indian admixture brought from very likely dacians or other european population, from more than 2k years ago, not from mixing with gypsies.
So some romanians have south indian admixture from some old european population that a mixed a little with south indians,meh.
I saw excellent programmers or science men from romanian gypsies which were educated.
And no offense but romanian gypsies are much more less violent than average nigger from US and much more smart.
When the ancestors of gypsies from Romania were living in houses and practicing agriculture in South India africans were living as savages,so there is no really term of comparasion between these 2 races of humans.