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Advisor(s)
Abstract(s)
A total of 553 Y-chromosomes were analyzed from mainland Portugal and the North Atlantic Archipelagos of
Ac¸ores and Madeira, in order to characterize the genetic composition of their male gene pool. A large majority
(78–83% of each population) of the male lineages could be classified as belonging to three basic Y chromosomal
haplogroups, R1b, J, and E3b. While R1b, accounting for more than half of the lineages in any of the Portuguese subpopulations, is a characteristic marker of many different West European populations, haplogroups J and E3b consist
of lineages that are typical of the circum-Mediterranean region or even East Africa. The highly diverse haplogroup
E3b in Portuguese likely combines sub-clades of distinct origins. The present composition of the Y chromosomes
in Portugal in this haplogroup likely reflects a pre-Arab component shared with North African populations or
testifies, at least in part, to the influence of Sephardic Jews. In contrast to the marginally low sub-Saharan African
Y chromosome component in Portuguese, such lineages have been detected at a moderately high frequency in our
previous survey of mtDNA from the same samples, indicating the presence of sex-related gene flow, most likely
mediated by the Atlantic slave trade.
Description
Keywords
Portuguese Y-chromosome SNP STR Sephardim Berber Portugal Madeira (Portugal) Azores (Portugal) . Faculdade de Ciências da Vida
Citation
Gonçalves, R., Freitas, A., Branco, M., Rosa, A., Fernandes, A. T., Zhivotovsky, L. A., ... & Brehm, A. (2005). Y‐chromosome lineages from Portugal, Madeira and Açores record elements of Sephardim and Berber ancestry. Annals of human genetics, 69(4), 443-454.
Publisher
Wiley