A 2017 study identifies Paleo-Eskimo ancestry in
Athabaskan and in other
Na-Dene-speaking populations. The authors note that the Paleo-Eskimo peoples lived alongside Na-Dene ancestors for millennia. The authors believe that this represents new evidence of a genetic connection between Siberian and Na-Dene populations mediated by Paleo-Eskimos. According to these scholars, in general, the Paleo-Eskimos had large proportions of Beringian (which includes
Chukotko-Kamchatkan and
Eskimo-Aleut), Siberian, and
Southeast Asian ancestry. Furthermore, some geneticists and archaeologists, such as
David Reich, have hypothesized that the Paleo-Eskimos spread the Na-Dene languages into the American continent, which would make the Paleo-Eskimos cultural and linguistic relatives (if not ancestors) of Na-Dene peoples. In 2019, scholars concluded that the Palaeo-Eskimo people were the ancestors not only of modern Na-Dene-speaking peoples but also of the Eskimo-Aleut speakers. But this contribution did not come directly; rather, there was a 'Neo-Eskimo' intermediary. According to Flegontov et al., the later
Old Bering Sea archaeological culture came as a result of back-and-forth migrations across the
Bering Strait by the tribes associated with the Arctic Small Tool tradition, or their descendants (Old Whaling, Choris,
Norton culture, from 3,100 to 2,500 cal. yr BP). These people were mixing with the Chukotko-Kamchatkan speakers of Siberia. Eventually, the Old Bering Sea archaeological culture became the ancestor of the
Yup'ik and
Inuit, the speakers of Eskimo–Aleut languages. ==Genetics==