Research shows closer ties between Native Americans, Europeans
By Jim Forsyth
SAN ANTONIO, Texas (Reuters) - Native Americans have closer genetic ties to people in Eurasia, the Middle East and Europe than previously believed, according to new research on a 24,000-year-old human bone.
Genome sequencing on the arm bone of a 3-year-old Siberian boy known as the "Mal'ta Boy," the world's oldest known human genome, shows that Native Americans share up to one-third of their DNA with people from those regions, said Kelly Graf, a research assistant professor at the Department of Anthropology at Texas A&M University and a member of the international research team.
The team is led by researchers at the University of Copenhagen in Denmark. The study was published in the journal Nature this week.
The results add a new dimension to earlier beliefs that Native Americans were mostly descended from East Asians who crossed the land bridge from Siberia to North America some 14,000 years ago, Graf said on Thursday.
Native Americans still have genetic connections to East Asians, Graf said, but the new sequencing shows that a "significant part" of their genome, as much as 35 percent, is linked to the Middle East, Eurasia and Europe.
"The Mal'ta people who had this DNA were part of a group that ranged anywhere from Lake Baikal (Siberia) into Central Europe," she said. "This is part of a group that is genetically related to each other."
They are not genetically related to the East Asians, however, so the question remains how DNA from these two peoples both ended up in the genetic code of Native Americans. "Native American ancestry is very complicated and very complex," Graf said.
One theory, she said, is that the two distinct peoples crossed the land bridge separately and met up in North America. Continued...