Patrilineal Genetic Ancestry of Moroccan Jews

This Y-chromosome study of Moroccan Jews, the largest conducted to date, analyzes the patrilineal origins of 288 men of genealogically verified Moroccan Jewish descent through the Avotaynu DNA Project, identifying 111 distinct founder lineages. The long-standing hypothesis of large-scale Berber Judaization has not previously been tested at full Y-chromosome resolution; our findings provide the first systematic evidence against it. Approximately 71% of founder lineages and 80% of individuals trace to haplogroups common in the Middle East. Only 4.5% of founder lineages are of autochthonous North African origin. Iberian-origin lineages account for 11% of Moroccan Jewish founder lineages reflecting sustained demographic and cultural exchange between Morocco and the Iberian Peninsula over many centuries. Split dates between Moroccan and Ashkenazi or Sephardic subclades cluster between the 5th and 8th centuries CE, suggesting that the ancestral lineages of contemporary Moroccan Jews were already present across the Mediterranean basin during late Antiquity and the early medieval period. Analysis of 190 distinct Moroccan Jewish surname roots identifies 29 polygenic and 30 monogenic surnames, and demonstrates that the linguistic origin of a surname, including surnames of Maghrebi morphology, does not necessarily reflect its bearer’s Y-chromosome ancestry. Unlike Ashkenazi Jews, Moroccan Jews show no evidence of a founder effect or genetic bottleneck, and display a remarkable patrilineal diversity. Among the individual lineages documented here are the first paleogenetic link between a contemporary Moroccan Jewish patriline and a victim of the 1348 Tàrrega pogrom, an Iberian/Ashkenazi split traceable to tenth-century al-Andalus, and an unexpected connection between a predominantly Moroccan Jewish lineage and the Saint Thomas Syrian Christian community of Kerala. Moroccan Jewish patrilineal heritage is overwhelmingly Middle Eastern in origin and has been preserved with remarkable continuity across two millennia of diaspora, persecution, and migration.