Study of Ashkenazi Jewish Population Reveals Schizophrenia Mutation
"Just a few hundred individuals who migrated to Eastern Europe less than 1,000 years ago are the ancestors of nearly 10 million Ashkenazi Jews today. This lineage, combined with a tradition of marriage within the community, has resulted in a more uniform genetic background in which to identify disease-related variants."
https://www.technologynetworks.com/neuroscience/news/study-of-ashkenazi-jewish-population-reveals-new-schizophrenia-mutation-347001