Forty years ago, a Buddhist monk found a human mandible bone at Baishiya Karst Cave, perched 10,000 feet above sea level on the Tibetan Plateau. The bone they found has now been dated to 160,000 years ago. And analysis of the proteins caught in its teeth demonstrate that the mandible belonged to the Denisovan branch of the hominin family.
This is the first evidence for Denisovans found outside of southern Siberia’s Denisova Cave. That cave is just 2,300 feet above sea level. It is also about 1,750 miles northwest of Baishiya Karst Cave. The mandible therefore revealed the Denisovans were widely distributed, and able to adapt to extremely high altitudes.
This is likely related to the mutation, found in previous Denisovan genetic studies, that assists survival in low-oxygen environments such as the high-altitude Tibetan Plateau. The same mutation has been found in present-day Tibetans. And given that the Denisovans once lived in the area, perhaps a long-ago intermarriage introduced the gene to the Tibetans? It seems more likely than the exact same gene randomly mutating twice.
Nenhum comentário:
Postar um comentário