The Denisovans
Cory Panshin on December 25, 2010A study that came out this week adds tantalizing new details to the story of how modern humans reached eastern Asia, and I’ve found it particularly intriguing in light of the non-orthodox scenario of human expansion that I’ve been developing in recent entries.
It appears that the sequencing of DNA extracted from a finger-bone found in a cave in Siberia has demonstrated the existence of a previously unknown species of archaic humans. Researchers have dubbed them the Denisovans, after the cave where the bone was discovered, and describe them as the Far Eastern cousins of the Neanderthals, with whom they shared a common ancestor 400,000 years ago.
This study has a number of fascinating implications. For one thing, it overturns the old Eurocentric assumption that eastern Asia was inhabited solely by the relatively primitive and small-brained Homo erectus until the arrival of modern humans.
But the really extraordinary conclusion it reaches is that the first modern humans to arrive in Southeast Asia must have interbred with Denisovans in the same way that modern humans in the Middle East interbred with Neanderthals. The researchers determined that about 5% of the DNA of present-day Melanesians — who inhabit New Guinea and the smaller islands nearby — is of Denisovan origin.