The origin of the Ashkenazi Jews, who come most recently from Europe, has largely been shrouded in mystery. But a new study suggests that at least their maternal lineage may derive largely from Europe.

Though the finding may seem intuitive, it contradicts the notion that European Jews mostly descend from people who left Israel and the Middle East around 2,000 years ago. Instead, a substantial proportion of the population originates from local Europeans who converted to Judaism, said study co-author Martin Richards, an archaeogeneticist at the University of Huddersfield in England.

Richards and his colleagues analyzed mitochondrial DNA, which is contained in the cytoplasm of the egg and passed down only from the mother, from more than 3,500 people throughout the Near East, the Caucusus and Europe, including Ashkenazi Jews.

The team found that four founders were responsible for 40 percent of Ashkenazi mitochondrial DNA, and that all of these founders originated in Europe. The majority of the remaining people could be traced to other European lineages.

All told, more than 80 percent of the maternal lineages of Ashkenazi Jews could be traced to Europe, with only a few lineages originating in the Near East.

The genetics suggest many of the founding Ashkenazi women were actually converts from local European populations.

"The simplest explanation was that it was mainly women who converted and they married with men who'd come from the Near East," Richards told LiveScience.

Live Science — October 8, 2013

A new study concludes that all Ashkenazi Jews can trace their ancestry to a “bottleneck” of just 350 individuals, dating back to between 600 and 800 years ago.

The study, published in the Nature Communications journal Tuesday, was authored by Shai Carmi, a computer science professor at Columbia University, and more than 20 medical researchers from Yale, Columbia, Yeshiva University’s Albert Einstein College of Medicine, Memorial Sloan-Kettering Cancer Center, Hebrew University of Jerusalem and other institutions.

Researchers analyzed the genomes of 128 Ashkenazi Jews and compared them to those of non-Jewish Europeans in order to determine which genetic markers are unique to Ashkenazi Jews. They found that the Ashkenazi Jews’ genetic similarities were so acute that one of the study’s researchers, Columbia professor Itsik Pe’er, told the Live Science website that among Ashkenazi Jews, “everyone is a 30th cousin.”

Ashkenazi Jews are known to have origins in the Levant, which Israel is smack dab in the middle of. But exactly who “European” Ashkenazi Jews are has long been debated. An analysis of the gene database shows that the original Ashkenazi Jews were about half European and half Middle Eastern. They lived in the medieval era, about 600 to 800 years ago, according to the analysis – and numbered just 350 or so people.

“Our analysis shows that Ashkenazi Jewish medieval founders were ethnically admixed, with origins in Europe and in the Middle East, roughly in equal parts,” said Shai Carmi, a post-doctoral scientist who works with Pe’er and conducted the analysis. “[The] data are more comprehensive than what was previously available, and we believe the data settle the dispute regarding European and Middle Eastern ancestry in Ashkenazi Jews.”

Times of Israel — 16 September 2014

New research suggests that the majority of the world’s modern Jewish population is descended mainly from people from ancient Turkey, rather than predominantly from elsewhere in the Middle East.

The new research suggests that most of the Jewish population of northern and eastern Europe – normally known as Ashkenazic Jews – are the descendants of Greeks, Iranians and others who colonized what is now northern Turkey more than 2000 years ago and were then converted to Judaism, probably in the first few centuries AD by Jews from Persia. At that stage, the Persian Empire was home to the world’s largest Jewish communities.

According to research carried out by the geneticist, Dr Eran Elhaik of the University of Sheffield, over 90 per cent of Ashkenazic ancestors come from that converted partially Greek-originating ancient community in north-east Turkey.

His research is based on genetic, historical and place-name evidence. For his geographic genetic research, Dr Elhaik used a Geographic Population Structure computer modelling system to convert Ashkenazic Jewish DNA data into geographical information.

Dr Elhaik, an Israeli-born geneticist who gained his doctorate in molecular evolution from the University of Houston, believes that three still-surviving Turkish villages – Iskenaz, Eskenaz and Ashanaz – on the western part of an ancient Silk Road route were part of the original Ashkenazic homeland. He believes that the word Ashkenaz originally comes from Ashguza - the ancient Assyrian and Babylonian name for the Iron Age Eurasian steppeland people, the Scythians.

Referring to the names of the three Turkish villages, Dr Elhaik points out that “north-east Turkey is the only place in the world where these place-names exist”.

Independent UK — 20 April 2016

Language is the atom of a community, the molecule that binds its history, culture, behavior, and identity, and the compound that unites its geography and genetics. It is thereby not surprising that the origin of AJs remains the most enigmatic and underexplored topics in history. Since the linguistic approaches utilized to answer this question have thus far provided inconclusive results, we analyzed the genomes of Yiddish and non-Yiddish speaking AJs in search for their geographical origins. We traced nearly all AJs to major primeval trade routes in northeastern Turkey adjacent to primeval villages, whose names may be derived from “Ashkenaz.” We conclude that AJs probably originated during the first millennium when Iranian Jews Judaized Greco-Roman, Turk, Iranian, southern Caucasus, and Slavic populations inhabiting the lands of Ashkenaz in Turkey. Our findings imply that Yiddish was created by Slavo-Iranian Jewish merchants plying the Silk Roads between Germany, North Africa, and China.