September 26, 2011
As scientists from Harvard Medical School in Boston (USA) and the Max Planck Institute for Evolutionary Anthropology in Leipzig have discovered, the Denisova hominin passed on genetic material not only to populations that live in New Guinea today, but also to Australian aborigines and population groups in the Philippines. David Reich, professor of Genetics at Harvard Medical School, says: “The Denisovan DNA is comparable to a medical contrast agent that can be used to make a person’s blood vessels visible. It has such a high recognition value that even small volumes can be detected in individuals. Therefore, we were able to track down Denisovan DNA in human dispersals. The sequencing of prehistoric DNA is an important tool for researching human evolution.” The scientists have discovered that, contrary to the information available up to now, modern humans possibly populated Asia in at least two migration waves. According to David Reich, the original inhabitants who still populate Southeast Asia and Oceania today came from the first migration wave. Later migrations formed populations in East Asia that are related to the population found in Southeast Asia today.
Accordingly, Denisova hominins were spread across an extraordinarily large ecological and geographical area extending from Siberia to tropical Southeast Asia. “The fact that Denisovan DNA can be detected in some but not other original inhabitant populations living in Southeast Asia today shows that numerous populations with and without Denisovan DNA existed over 44,000 years ago,” says Mark Stoneking, professor at the Department of Evolutionary Genetics at the Max Planck Institute for Evolutionary Anthropology and leading author of the study. “The simplest explanation for the presence of Denisovan genetic material in some but not all groups is that Denisova people themselves lived in Southeast Asia.” In December 2010, Svante Pääbo from the Max Planck Institute for Evolutionary Anthropology reported in the journal Nature that Denisova hominins contributed genes to human populations living in New Guinea today.