Scientists have long agreed that early humans mated with Neanderthals, but a pair of recent studies have shed light on when exactly this DNA mixing occurred. Such a revelation could help geneticists learn more about our past and, crucially, our future.
The studies, published earlier this month in the journals Science and Nature, provide information about the timelines of Neanderthal and early human interactions, and reveal that ancient interbreeding left strands in modern DNA that can still be seen today. The fact that Neanderthals and early humans interbred has been known since the first Neanderthal genome was sequenced in 2010, but these studies suggest the interactions happened more recently than scientists once thought.
Researchers for the Science study "analysed genomes from 275 present-day and 59 prehistoric humans who lived between 2,200 and 45,000 years ago", said The Washington Post, determining that "Neanderthals and humans interbred for 7,000 years, starting about 50,500 years ago".
The new studies show that we may have this interbreeding to thank for modern immunity. Neanderthal genes "could have been crucial to our success by protecting us from new diseases we hadn't previously encountered," said the BBC. This Neanderthal DNA might have given us "better adaptive capabilities outside of Africa", Professor Chris Stringer, of London's Natural History Museum, told the outlet. Early humans "had evolved in Africa, whereas the Neanderthals had evolved outside of Africa", and "by interbreeding with the Neanderthals we got a quick fix to our immune systems".
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