International Journal of Anthropology

, Volume 12, Issue 1, pp 5–16 | Cite as

Genetic structure of two urban afro-brazilian populations

  • M. C. Bortolini
  • T. A. Weimer
  • F. M. Salzano
  • L. B. Moura
  • M. C. B. O. Silva


A total of 218 individuals living in the Brazilian cities of Porto Alegre (in the South) and Salvador (in the Northeast) were variously studied in relation to nine erythrocyte and four plasma protein systems. The results were compared with previous studies in some of these systems, and estimates of interethnic admixture obtained in subsamples according to morphological appearance. As a whole, Afro-Brazilians from Salvador show 42% of non-African genes, the corresponding figure for Porto Alegre being 59%. The Amerindian contribution to these individuals was estimated as null or negligible. Average heterozygosities are similar to those obtained for African groups, but the gene differentiation coefficient (GST') is small. The phylogenetic tree indicates a closer relationship of Salvador with the African subcluster, as would be expected by the admixture and istorical data. Analyses such as this one are important for the unraveling of the complex networks responsible for the present variability of human populations, and for the dispelling of racist concepts.

Key words

Afro-Brazilians Protein polymorphisms Ethnic admixture Gene diversity analysis 


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Copyright information

© International Institute for the Study of Man 1997

Authors and Affiliations

  • M. C. Bortolini
    • 1
  • T. A. Weimer
    • 1
  • F. M. Salzano
    • 1
  • L. B. Moura
    • 1
  • M. C. B. O. Silva
    • 2
  1. 1.Dep. de Genética Instituto de BiociênciasUniversidade Federal do RioAlegreBrazil
  2. 2.Lab. de Genética Médica Hospital Prof. Edgard SantosUniversidade Federal da BahiaSalvadorBrazil

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