“Modern Europeans hail from three separate populations that interbred”
Until now, the only genetic traces of these people came from two Stone-Age hunter-gatherers: an 8000-year-old man found near Loschbour in Luxembourg and a 7000-year-old man found near La Brana, Spain. Together, they revealed that early European hunter-gatherers tended to have dark skin and blue eyes.
The Kostenki man’s 37,000-year-old DNA, sequenced by the Centre for GeoGenetics at the University of Copenhagen in Denmark, pushes the existence of this population back tens of thousands of years and shows that it extended across Eurasia (Science, doi.org/w2v).
Eske Willerslev and colleagues analysed his genetic markers and found that he was closely related to the Loschbour and La Brana hunter-gatherers, contemporary Europeans and some contemporary Siberians. “This shows some level of continuity in European populations across almost 30,000 years,” says Iosif Lazaridis at Harvard University, another proponent of the theory that Europeans are a mix of three distinct populations.
What the Kostenki team did not find was any relationship to East Asians, suggesting that by the time the man was born, the European and Asian lineages had already split from each other. By contrast, another ancient genome published just a few weeks ago, belonging to a 45,000-year-old west Siberian known as Ust’-Ishim, was related to both Europeans and Asians. That suggests the two groups parted ways between 45,000 and 37,000 years ago and makes theKostenki man the oldest European to have his genome sequenced.
The latest study also further narrows when early humans interbred with their now-extinct cousins, the Neanderthals. The recent study of Ust’-Ishim narrowed these encounters down to sometime between 50,000 and 60,000 years ago (New Scientist, 25 October, p 7). Calculations based on the Kostenki man’s genome now suggests they took place about 54,000 years ago.