400,000-Year-Old Teeth Hint at Homo Erectus-Denisovan Tryst
Ancient tooth enamel from China has opened a rare molecular window onto one of the murkiest chapters in human evolution. A new Nature study reports that proteins preserved in 400,000-year-old Homo erectus teeth carry a signal also seen in Denisovans, raising the possibility that these two ancient human relatives once met and mixed in East Asia.
Protein Clues from Ancient Teeth
The research team, led by Qiaomei Fu of the Institute of Vertebrate Paleontology and Paleoanthropology in Beijing, analysed enamel proteins from six Middle Pleistocene Homo erectus individuals from Zhoukoudian, Hexian, and Sunjiadong in China. As The Independent noted in its report on the find, the sampled teeth belonged to five males and one female, giving researchers a rare biological glimpse of a species whose DNA is usually too degraded to study.
Instead of relying on DNA, the scientists used mass spectrometry to recover fragments of enamel proteins. In one tooth-enamel protein, ameloblastin, all six individuals shared two unusual amino-acid variants. One, AMBN(A253G), has not been found in Neanderthals, Denisovans, modern humans, Homo antecessor, or the older Homo erectus specimen from Dmanisi in Georgia.
www.Ancient-Origins.net – Reconstructing the story of humanity’s past
Source: https://www.ancient-origins.net/news-evolution-human-origins/homo-erectus-teeth-00102792
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