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[...] 'We were surprised to find evidence that Ashkenazi Jews have higher heterozygosity than Europeans, contradicting the widely-held presumption that they have been a largely isolated group,' says first author Steven Bray, Ph D, a postdoctoral fellow in Warren's laboratory.
[...] High linkage disequilibrium can come either from an isolated population (for example, an island whose residents are all descendents of shipwreck survivors) or the relatively recent mixture of separate populations.
We identified genomic regions under selection that account for lactose and alcohol tolerance, and although we found evidence for positive selection at some AJ-prevalent disease loci, the higher incidence of the majority of these diseases is likely the result of genetic drift following a bottleneck.
Thus, the AJ population shows evidence of past founding events; however, admixture and selection have also strongly influenced its current genetic makeup." Excerpts from page 16222: "The Ashkenazi Jewish (AJ) population has long been viewed as a genetic isolate, kept separate from its European neighbors by religious and cultural practices of endogamy (1).
Projects you might qualify to join include "Gesher Galicia - Jewish DNA Project", "Jewish Gen Belarus SIG DNA Project", "Jewish Gen Hungarian SIG DNA Project", "German Jewish Gersig DNA Project", "Jewish Frankfurt", "Sephardic Heritage DNA Project", "Jews of Rhodes Project", "The Jewish R1b Project", "Ashkenazi Levite R1a1", and "Jewish E Project". Here we analyzed a large AJ cohort and found higher linkage disequilibrium (LD) and identity-by-descent relative to Europeans, as expected for an isolate.
The researchers were able to estimate that between 35 and 55 percent of the modern Ashkenazi genome comes from European descent.For more information about the American collection, consult: The Canadian collection consists of documents created by consuls in the Imperial Russian Consular offices located in Montréal, Vancouver and Halifax. The documents are written primarily in Russian, though frequently they are also written in six other Eastern European languages. The majority of files deal with immigrants from the Russian Empire who were of Jewish, Finnish, Ukrainian or Polish origins. In order to ensure that each applicant was a genuine Russian citizen, he or she was required to complete a questionnaire which included a photograph of themselves. The search results page displays the following fields: Click on the underlined Item Number of a record to access the Item page, which contains additional information specific to that record. Other religion (excluding those listed in numbers 8 to 12) with name written in full. A check mark (✓) indicates that a photograph of the applicant is contained in the file. A check mark (✓) indicates that information on the applicant's family members is contained in the file. Your search results will be posted as a results summary list from which you will be able to obtain an item description.