Human prehistoric ancestors mated with each other, study says

BY TYLER MACDONALD
Posted on OCT 18, 2019

A new study suggests that our ancient human ancestors mated with each other more frequently than we thought.

A new study reveals an inter-species prehistoric human ancestor with a Denisovan father and Neanderthal mother. The unique lovechild was named Denisova and was at least 13 years old when she died of unknown causes.

"There was earlier evidence of interbreeding between different hominin, or early human, groups," said Vivian Slon, lead author of the study. "But this is the first time that we have found a direct, first-generation offspring."
The team analyzed the remains of a bone fragment discovered in 2012 by Russian archaeologists, which revealed chromosomes that were half Denisovan and half Neanderthal. Both of these early human species split apart approximately 400,000 to 500,000 years ago.

"I initially thought that they must have screwed up in the lab," said senior author Svante Paabo.

Less than two dozen human genomes from before 40,000 years ago have been sequenced. Not only that, but the chances of discovering a half-and-half hybrid is already very small.

"The very fact that we found this individual of mixed Neanderthal and Denisovan origins suggests that they interbred much more often than we thought," Slon said.

"They must have quite commonly had kids together, otherwise we wouldn't have been this lucky," Paablo agreed.

"Part of the story of these groups is that they may simply have been absorbed by modern populations," he added. "The modern humans were more numerous, and the other species might have been incorporated."

The study highlights the possibility that Denisovans and Neanderthals might have mated more if not for the fact that the former typically settled in Europe.

The findings were published in Nature