These are nonsense studies disproven by an “israeli” himself. Search the work of Eran Elhaik.
“ Elhaik says he has proved that Ashkenazi Jews’ roots lie in the Caucasus — a region at the border of Europe and Asia that lies between the Black and Caspian seas — not in the Middle East. They are descendants, he argues, of the Khazars, a Turkic people who lived in one of the largest medieval states in Eurasia and then migrated to Eastern Europe in the 12th and 13th centuries. Ashkenazi genes, Elhaik added, are far more heterogeneous than Ostrer and other proponents of the Rhineland Hypothesis believe. Elhaik did find a Middle Eastern genetic marker in DNA from Jews, but, he says, it could be from Iran, not ancient Judea.”