As a Jewish genealogist who got involved in direct-to-consumer genetic genealogy testing very early on (14+ years ago), this is one of my biggest fears. Genetic

As a Jewish genealogist who got involved in direct-to-consumer genetic genealogy testing very early on (14+ years ago), this is one of my biggest fears. Genetic signatures for endogamous populations, in particular, are really easy to pick out of DNA samples. It’s already openly discussed in Jewish DNA Facebook groups and blogs which chromosome segments tend to be Ashkenazi “pile up” regions, to separate true potential cousin matches from just plain endogamy. A bad actor, or nation-state, could easily do the reverse and look for those segments on purpose…