Out of Africa just once? DNA offers fresh look at humanity’s family roots

Three human genome studies published Wednesday in Nature provide new clues as to when Homo sapiens, our earliest anatomically modern human ancestors, first left Africa.

After analyzing the DNA of 800 people from more than 270 populations, including a large number of aboriginal people in Australia and Papua New Guinea, the researchers found genetic evidence for a migration of humans out of Africa about 100,000 years ago – long before the migration that most modern Europeans, Asians, and Australians are descended from, which came about 60,000 years ago.

But that earlier migration largely failed. The populations died out within a few generations, ultimately contributing no more than a few percent of the genome to anyone alive today, the researchers say. READ MORE.