Hello everyone,
For those interested where Poles place in terms of intra-European and inter-continental genetic structure, please refer to my blog. You'll find there many links to latest studies and my commentary on them. Here's an examle...
Polish, European and world samples compared using almost 400,000 genome wide markers
Context is important when it comes to genetic affinity, and this is clearly illustrated by an article published in the European Journal of Human Genetics this week.
The real purpose of this study was to spot variation that might be useful in medical work. However, for all those interested where Poles and other Europeans cluster genetically on colourful graphs, my initial point here is crucial.
It really depends who's on the plot, and including non-European samples in this study has quite an effect on the result. For instance, on the intra-European graph Poles basically sit between Dresden and Moscow, but mixing more with the latter. When an African and two Asian populations are added, we end up almost at the top of a much tighter European blob, overlapping heavily with Swedes, Slovaks, Germans and Czechs, just to name a few.
This begs the question, what would happen if more populations were added? For example, from Italy, Finland, the Middle East, India, North and Central Asia, and so on? We can only guess at this stage, so let's hope someone in the game reads this blog.
Anyway, this study does have some very neat tables showing the relative affinity of the groups to each other. Spaniards exhibit the strongest links to the African sample, the Yoruba from Nigeria. On the other hand, its the Russians who are relatively closest to the Asians from China and Japan. Moreover, some individuals from France, Great Britain, Romania and Germany are also being pulled towards the non-Europeans, possibly indicating some sort of admixture? Hard to say, because the study doesn't really focus on that. Interestingly, the Poles' affinity to the Africans and Asians is rather weak in comparison to that shown by most of the other European groups.
On a final note, it's curious that unlike previous studies of this sort, the main gradient here is the one running from west to east, and not north to south. I suspect a lack of samples form Itlay and the southern Balkans is largely the reason for that. polishgenes.blogspot.com
|