http://www.nature.com/ejhg/journal/v13/n3/full/5201319a.html
Ashkenazi Jews, who have resided in various European countries during the Diaspora, traditionally trace their origin to the Jewish people that lived in the Holy Land before the Roman exile. However, some studies claimed that a substantial part of Ashkenazim were descendants of Eastern European non-Jews. In particular, according to Middle Age historians, the Khazars from a small kingdom near the Caspian Sea converted en masse to Judaism1 and therefore might have contributed to the composition of the emerging Ashkenazi community. Yet, recent genetic studies, based on Y chromosome polymorphic markers, clearly showed that Ashkenazim are more closely related to other Jewish and Middle Eastern groups than to their host populations in Europe.2, 3, 4 Those findings argue against large-scale male-mediated gene flow into the Ashkenazi community during the Diaspora. The male admixture proportion of Europeans in Ashkenazi Jews was estimated to be 0.5% per generation,3 indicating that Ashkenazim remained, to a large extent, genetically isolated throughout their history.
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