It’s Complicated! Extinct ‘ghost’ human species interbred with our own species 10000s of years ago.


Yoruba Obatala priests in their temple in Ife Credit Dierk Lange, Wikimedia Commons

According to the research conducted by scientists examining the genomes of West Africans. There are signs that an extinct human species interbred with our own species, the latest evidence of humankind’s complicated genetic ancestry.

It showed in the study West Africans trace a substantial proportion, some 2% to 19%, of their genetic ancestry to an extinct human species what the researchers named ‘Ghost Population’.

Professor Sriram Sriram Sankararaman from the University of California, Los Angeles (UCLA) human genetics and computer science professor who led the study that was published in the journal Science Advances said “We estimate interbreeding occurred approximately 43,000 years ago, with large intervals of uncertainty,”

According to the fossil evidence, Homo sapiens first appeared a bit more than 300,000 years ago in Africa and later spread worldwide, encountering other human species in Eurasia that have since gone extinct including the Neanderthals and the lesser-known Denisovans.

Previous genetic research showed that our species interbred with both the Neanderthals and Denisovans, with modern human populations outside of Africa still carrying DNA from both. But while there is an ample fossil record of the Neanderthals and a few fossils of Denisovans, the newly identified “ghost population” is more enigmatic.

Asked what details are known about this population, Sankararaman said, “Not much at this stage.”

Nok Terracotta Sculptures. Created: between circa -500 and circa 500
Nok Terracotta Sculptures. Created: between circa -500 and circa 500

“We don’t know where this population might have lived, whether it corresponds to known fossils, and what its ultimate fate was,” Sankararaman added.

Sankararaman said this extinct species seems to have diverged roughly 650,000 years ago from the evolutionary line that led to Homo sapiens, before the evolutionary split between the lineages that led to our species and to the Neanderthals.

The researchers examined genomic data from hundreds of West Africans including the Yoruba people of Nigeria and Benin and the Mende people of Sierra Leone, and then compared that with Neanderthal and Denisovan genomes. They found DNA segments in the West Africans that could best be explained by ancestral interbreeding with an unknown member of the human family tree that led to what is called genetic “introgression.”

It is unclear if West Africans derived any genetic benefits from this long-ago gene flow.

“We are beginning to learn more about the impact of DNA from archaic hominins on human biology,” Sankararaman said, using a term referring to extinct human species. “We now know that both Neanderthal and Denisovan DNA was deleterious in general but there were some genes where this DNA had an adaptive impact. For example, altitude adaptation in Tibetans was likely facilitated by a Denisovan introgressed gene.”

Original article: Reuters

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