Homo erectus Tooth Proteins Trace 400,000-Year Gene Flow to Southeast Asians
Updated
Updated · The Conversation · May 18
Homo erectus Tooth Proteins Trace 400,000-Year Gene Flow to Southeast Asians
6 articles · Updated · The Conversation · May 18
Six tooth-enamel samples from three Chinese sites dated to about 400,000 years ago yielded ancient proteins linking East Asian Homo erectus to Denisovans, a Nature study reported.
One shared amino-acid variant appears in both the Homo erectus teeth and Denisovans, and its matching genetic signal persists in living people at 21% in the Philippines and about 1% in India.
That pattern suggests Homo erectus passed the variant to Denisovans through interbreeding, and Denisovans later carried it into ancestors of modern Southeast Asians and Oceanians.
The protein evidence also helps confirm the Chinese fossils' Homo erectus identity, including disputed Hexian remains, showing enamel can preserve molecular clues long after DNA is lost.
More broadly, the findings add to evidence that archaic humans mixed repeatedly rather than dying out cleanly, and they open a path to test other DNA-poor lineages such as Homo floresiensis and Homo luzonensis.
Were these ancient fossils truly Homo erectus, or a mysterious 'ghost' branch of the Denisovans?
Ancient proteins have revealed a lost ancestor. Which other extinct relatives are hiding in our DNA?
If our ancestors interbred with Homo erectus, does this redefine what it means to be human?
Ancient Proteins Reveal Homo erectus–Denisovan Interbreeding and Its Lasting Genetic Legacy in Modern Asians
Overview
A groundbreaking study published in May 2026 revealed compelling molecular evidence of ancient interbreeding, fundamentally changing our understanding of early human history. By analyzing ancient proteins from 400,000-year-old Homo erectus teeth found in China, researchers discovered a previously unknown gene flow from Homo erectus to Denisovans. This gene flow left a detectable genetic trace in some modern Southeast Asian and Oceanian populations, establishing a direct molecular link between ancient Homo erectus individuals and people living in Asia today. Innovative experimental and computational methods made this discovery possible, highlighting a complex web of early human interactions.