Asians have "roots", with BIGGER BRAINS !

Neandertal Genome Yields Evidence Of Interbreeding With Humans - Science News

Some people don’t just have a caveman mentality; they may actually carry a little relic of the Stone Age in their DNA.

A new study of the Neandertal genome shows that humans and Neandertals interbred. The discovery comes as a big surprise to researchers who have been searching for genetic evidence of human-Neandertal interbreeding for years and finding none.

About 1 percent to 4 percent of DNA in modern people from Europe and Asia was inherited from Neandertals, researchers report in the May 7 Science. “It’s a small, but very real proportion of our ancestry,” says study coauthor David Reich of the Broad Institute of MIT and Harvard in Cambridge, Mass. Comparisons of the human and Neandertal genomes are also revealing how humans evolved to become the sole living hominid species on the planet.

Neandertals lived in Europe, the Middle East and western Asia until they disappeared about 30,000 years ago. The new data indicate that humans may not have replaced Neandertals, but assimilated them into the human gene pool.

“Neandertals are not totally extinct; they live on in some of us,” says Svante Pääbo of the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, and leader of the Neandertal genome project.

He and other geneticists involved in the effort to compile the complete genetic instruction book of Neandertals didn’t expect to find that Neandertals had left a genetic legacy. Earlier analyses that looked at only a small part of the genome had contradicted the notion that humans and Neandertals intermixed (SN Online: 8/7/08).

“We as a consortium came into this with a very, very strong bias against gene flow,” Reich says. In fact, when he and his colleagues announced the completion of a rough draft of the Neandertal genome a year ago, the researchers said such genetic exchange was unlikely (SN: 3/14/09, p. 5).

But several independent lines of evidence now convince the researchers that humans and Neandertals did interbreed. “The breakthrough here is to show that it could happen and it did happen,” Pääbo says.

The result came as no surprise to some scientists, however. Archaeologists have described ancient skeletons from Europe that had characteristics of both early modern humans and Neandertals; evidence, the researchers say, of interbreeding between the two groups. But until the cataloging of the entire Neanderthal genome, genetic studies could find no evidence to support the idea.

“After all these years the geneticists are coming to the same conclusions that some of us in the field of archaeology and human paleontology have had for a long time,” says João Zilhão, an archaeologist and paleoanthropologist at the University of Bristol in England. “What can I say? If the geneticists come to this same conclusion, that’s to be expected.”
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