[LINK] "Ancient human genomes suggest three ancestral populations for present-day Europeans"

[rfmcdonald]

The Dragon's Tales linked to a study in Nature analyzing ancient DNA.

We sequenced the genomes of a ~7,000-year-old farmer from Germany and eight ~8,000-year-old hunter-gatherers from Luxembourg and Sweden. We analysed these and other ancient genomes with 2,345 contemporary humans to show that most present-day Europeans derive from at least three highly differentiated populations: west European hunter-gatherers, who contributed ancestry to all Europeans but not to Near Easterners; ancient north Eurasians related to Upper Palaeolithic Siberians, who contributed to both Europeans and Near Easterners; and early European farmers, who were mainly of Near Eastern origin but also harboured west European hunter-gatherer related ancestry. We model these populations’ deep relationships and show that early European farmers had ~44% ancestry from a ‘basal Eurasian’ population that split before the diversification of other non-African lineages.

The study is not available in full at the link.

The Guardian provides more analysis.

The findings suggest that the arrival of modern humans into Europe more than 40,000 years ago was followed by an influx of farmers some 8,000 years ago, with a third wave of migrants coming from north Eurasia perhaps 5,000 years ago. Others from the same population of north Eurasians took off towards the Americas and gave rise to Native Americans.

Modern Europeans are various mixes of the three populations. Sardinians are more than 80% early European farmer, with less than 1% of their genetic makeup coming from the ancient north Eurasians. In the Baltic states such as Estonia, some modern people are 50% hunter-gatherer and around a third early European farmer.

The modern English inherited around 50% of their genes from early European farmers, 36% from western European hunter-gatherers, and 14% from the ancient north Eurasians. According to the study, published in Nature, modern Scots can trace 40% of their DNA to the early European farmers and 43% to hunter-gatherers, though David Reich, a senior author on the study at Harvard University, said the differences were not significant.