This seems related. “The analysis revealed two distinct subgroups within the remains: one with greater Middle Eastern ancestry, which may represent Jews with origins in Western Germany, and another with greater Eastern and Central European ancestry. The modern Ashkenazi population formed as a mix of these groups and absorbed little to no outside genetic influences over the 600 years that followed, the authors said.
Some disease-causing mutations that are widespread in modern Ashkenazi Jews are suspected to have been introduced by members of the founding group long ago. The team found some of these mutations in Erfurt as well, indicating that the medieval Ashkenazi population indeed originated from an extremely small set of founders.
Further evidence came from mitochondrial DNA, which is part of the genome transmitted only from mothers. Analyses showed that one third of the Erfurt individuals descended in their maternal line from a single ancestral woman, again highlighting how small the founding population must have been, the authors said.” https://hms.harvard.edu/news/ancient-dna-provides-new-insights-ashkenazi-jewish-history.
This seems related. “The analysis revealed two distinct subgroups within the remains: one with greater Middle Eastern ancestry, which may represent Jews with origins in Western Germany, and another with greater Eastern and Central European ancestry. The modern Ashkenazi population formed as a mix of these groups and absorbed little to no outside genetic influences over the 600 years that followed, the authors said.
Some disease-causing mutations that are widespread in modern Ashkenazi Jews are suspected to have been introduced by members of the founding group long ago. The team found some of these mutations in Erfurt as well, indicating that the medieval Ashkenazi population indeed originated from an extremely small set of founders.
Further evidence came from mitochondrial DNA, which is part of the genome transmitted only from mothers. Analyses showed that one third of the Erfurt individuals descended in their maternal line from a single ancestral woman, again highlighting how small the founding population must have been, the authors said.” https://hms.harvard.edu/news/ancient-dna-provides-new-insights-ashkenazi-jewish-history.