First Americans probably did not come from Siberia

CHARLOTTESVILLE, VA (Herald de Paris) — Mitochondrial DNA analysis along the human genome in 2014 has revealed that members of some native North American tribes share a maternal ancestry, haplogroup X, which is linked to the maternal ancestors of some present-day individuals in western Asia (And possibly Western Europe), albeit distantly. This has also provided some support for pre-Clovis models.

More specifically, a variant of mitochondrial DNA called X2a found in many Native Americans has been traced to western Eurasia, while not being found in eastern Eurasia.

http://www.heralddeparis.com/first-americans-probably-did-not-come-from-siberia/