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(emphasis added)
Although the Ashkenazi (European) Jewish community separated from their Mediterranean ancestors some 1,200 years ago and lived among Central and Eastern European gentiles, their paternal gene pool still resembles that of other Jewish and Semitic groups originating in the Middle East.
A low rate of intermarriage between Diaspora Jews and local gentiles was the key reason for this continuity. Since the Jews first settled in Europe more than 50 generations ago, the intermarriage rate was estimated to be only about 0.5% in each generation.
The Ashkenazi paternal gene pool does not appear to be similar to that of present-day Turkish speakers. This finding opposes the suggestion that Ashkenazim are descended from the Kuzars, a Turkish-Asian empire that converted to Judaism en masse in or about the 8th century CE.
A new look at the DNA of the Ashkenazi Jewish population has thrown light on its still mysterious origins.
Until now, it had been widely assumed by geneticists that the Ashkenazi communities of Northern and Central Europe were founded by men who came from the Middle East, perhaps as traders, and by the women from each local population whom they took as wives and converted to Judaism.
But the new study, published online this week in The American Journal of Human Genetics, suggests that the men and their wives migrated to Europe together.
The researchers, Doron Behar and Karl Skorecki of the Technion and Ramban Medical Center in Haifa, and colleagues elsewhere, report that just four women, who may have lived 2,000 to 3,000 years ago, are the ancestors of 40 percent of Ashkenazis alive today. The Technion team's analysis was based on mitochondrial DNA, a genetic element that is separate from the genes held in the cell's nucleus and that is inherited only through the female line. Because of mutations - the switch of one DNA unit for another - that build up on the mitochondrial DNA, people can be assigned to branches that are defined by which mutations they carry.
In the case of the Ashkenazi population, the researchers found that many branches coalesced to single trees, and so were able to identify the four female ancestors.
Looking at other populations, the Technion team found that some people in Egypt, Arabia and the Levant also carried the set of mutations that defines one of the four women. They argue that all four probably lived originally in the Middle East.