Denisovans: Ancient Hominins That Shaped Human Adaptation Through Interbreeding

Scientists have found that Denisovans, a recently identified group of ancient humans, interbred with early modern humans during multiple events. This mixing of genes played an important role in shaping early human history.

The Denisovans were discovered in 2010 when scientists sequenced a genome from a finger bone found in the Denisova cave in Siberia. Unlike Neanderthals, whose remains are more numerous, Denisovans are known primarily from a few bones and teeth. Despite this, scientists have identified at least three instances where Denisovan genes contributed to the genetic make-up of modern humans.

The research highlights specific genes from Denisovans that helped modern humans adapt to different environments. For example, one gene helps Tibetans tolerate low oxygen levels at high altitudes. Other genes improve immune responses and aid in fat metabolism, which benefits Arctic populations like the Inuit.

Future studies may reveal even more about the genetic links between Denisovans and modern humans, particularly in populations that have not been thoroughly studied. This could uncover additional traces of Denisovan ancestry. Combining more genetic findings with archaeological evidence could also fill gaps in our understanding of Denisovan influence.

The research was funded by the European Research Council and published in Nature Genetics.