Khazar - Debate About Khazar Conversion To Judaism - Theory of Khazar Ancestry of Ashkenazi Jews - Genetic Studies On Ashkenazi Jewry

Genetic Studies On Ashkenazi Jewry

See also: Ashkenazi Jews#Genetic origins and Genetic studies on Jews

A 1999 study by Hammer et al., published in the Proceedings of the United States National Academy of Sciences compared the Y chromosomes of Ashkenazi, Roman, North African, Kurdish, Near Eastern, Yemenite, and Ethiopian Jews with 16 non-Jewish groups from similar geographic locations. It found that "Despite their long-term residence in different countries and isolation from one another, most Jewish populations were not significantly different from one another at the genetic level... The results support the hypothesis that the paternal gene pools of Jewish communities from Europe, North Africa, and the Middle East descended from a common Middle Eastern ancestral population, and suggest that most Jewish communities have remained relatively isolated from neighboring non-Jewish communities during and after the Diaspora." According to Nicholas Wade "The results accord with Jewish history and tradition and refute theories like those holding that Jewish communities consist mostly of converts from other faiths, or that they are descended from the Khazars, a medieval Turkish tribe that adopted Judaism."

A 2010 study on Jewish ancestry by Atzmon et al. says "Two major groups were identified by principal component, phylogenetic, and identity by descent (IBD) analysis: Middle Eastern Jews and European/Syrian Jews. The IBD segment sharing and the proximity of European Jews to each other and to southern European populations suggested similar origins for European Jewry and refuted large-scale genetic contributions of Khazars or Slavic populations to the formation of Ashkenazi Jewry."

Concerning male-line ancestry, several Y-DNA studies have tested the hypothesis of Khazar ancestry amongst Ashkenazim. In these studies Haplogroup R1a chromosomes (sometimes called Eu 19) have been identified as potential evidence of one line of Eastern European ancestry amongst Ashkenazim, which could possibly be Khazar. One concluded that "neither the NRY haplogroup composition of the majority of Ashkenazi Jews nor the microsatellite haplotype composition of the R1a1 haplogroup within Ashkenazi Levites is consistent with a major Khazar or other European origin" and another that "if the R-M17 chromosomes in Ashkenazi Jews do indeed represent the vestiges of the mysterious Khazars then, according to our data, this contribution was limited to either a single founder or a few closely related men, and does not exceed ~ 12% of the present-day Ashkenazim."

In August 2012, Dr. Harry Ostrer summarizing his, as well as all genetic studies carried out in last 20 years, stated in his book "Legacy: A Genetic History of the Jewish People" that all major Jewish groups do have common Middle Eastern origin, originating from ancient Israelites, and refuted any large scale genetic contribution from the Turkic Khazars.