DNA analysis provides insights into how was Europe repopulated after Ice Age

Scientists have used DNA analysis to gain important new insights into how human beings repopulated Europe as the Ice Age relaxed its grip. 

This schematic map depicts major migratory events thought to have affected the gene pool of modern Europeans. Black arrows indicate the first settlement by modern humans around 45 thousand years ago (kya). At the end of the last ice age, around 10–15 kya, Europe was re-populated from glacial refugia (red arrows). Around 8–10 kya, Neolithic farmers came to Europe from Anatolia and the Fertile Crescent (green arrows) [Credit: Alessandro Achilli and Antonio Torroni\Current Biology]
Dr Maria Pala, who is based at the University of Huddersfield -- now a key centre for archaeo-genetics research -- is the lead author of an article in the latest issue of the American Journal of Human Genetics which shows how the Near East was a major source of replenishment when huge areas of European territory became habitable again, up to 19,000 years ago. 

Until the new findings, it was thought that there were two principal safe havens for humans as the Ice Age, or Last Glacial Maximum, descended, approximately 26,000 years ago. They were a "Franco-Cantabrian" area roughly coinciding with northern Spain/southern France, and a "Periglacial province" on the Ukrainian plains. 

Now Dr Pala and her colleagues have greatly added to this picture by analyzing large quantities of mitochondrial DNA from Europeans who belong to two major lineages -- who share a common genetic ancestor -- named J and T. It is known that these haplo-groups originated in the Middle East and until the latest research it was thought that they migrated to Europe in the Neolithic age, approximately 9,000 years ago. 

The research project outlined in the American Journal of Human Genetics presents evidence that humans belonging to the J and T haplo-groups actually migrated to Europe much earlier than previously believed, as the Ice Age drew to a close. 

"The end of the Last Glacial Maximum allowed people to recolonize the parts of Europe that had been deserted and this expansion allowed increase of human populations," says Sardinian-born Dr Pala, who begun research into the topic while at the University of Pavia in Italy. 

She later relocated to the UK and is now a Senior Research Fellow at the University of Huddersfield, where archaeo-genetics research -- in newly equipped laboratories -- is headed by 

Professor Martin Richards, a leader in a field of science which combines archaeology with genetics to learn about the early history of humans and how they colonized the planet. 

In addition to purely scientific challenges and discoveries, Dr Pala believes that archaeo-genetics has important lessons to teach humanity. 

"It helps us to reevaluate the perception of our identity. We are highly focused on identifying ourselves as Italians, British or whatever, but by analyzing DNA we discover that originally, not such a long time ago, we came from a common source." 

Source: University of Huddersfield [May 08, 2012]

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