Article: The Mysterious New Northern Eurasians

Oldest human genome reveals roots of first Americans
http://www.newscientist.com/article/dn24616-oldest-human-genome-reveals-roots-of-first-americans.html

This Mal'ta Boy (as he is called in other articles) represents the oldest human genome sequenced to date.  His genes held at least one surprise:  his Y chromosome from his father's line is now found more among western Europeans.  His entire genome is closely related to modern Native Americans -but NOT to east Asians.  Native Americans are thought to have migrated from eastern Siberia across Berengia and into the Americas.  Native American genetics DO have east Asian genes.  So, how could this boy be from a Native American ancestral AND have no east Asian genes?  Well, it appears there once was an ancient northern Eurasian population hunting on the Ice Age steppes that spanned from Europe to Siberia.  This group contributed genes to modern Europeans in the west.  In the east, later generations of the Mal'ta Boy's people intermixed with east Asians, and later some of this new, hybrid group emigrated to the Americas.  Or, so the latest theory drawing on this work hypothesizes.