Genomic ancestry of rural African-derived populations from Southeastern Brazil
Article first published online: 2 NOV 2012
Copyright © 2012 Wiley Periodicals, Inc.
American Journal of Human Biology
Volume 25, Issue 1, pages 35–41, January/February 2013
How to Cite
Kimura, L., Ribeiro-Rodrigues, E. M., De Mello Auricchio, M. T. B., Vicente, J. P., Batista Santos, S. E. and Mingroni-Netto, R. C. (2013), Genomic ancestry of rural African-derived populations from Southeastern Brazil. Am. J. Hum. Biol., 25: 35–41. doi: 10.1002/ajhb.22335
- Issue published online: 18 DEC 2012
- Article first published online: 2 NOV 2012
- Manuscript Accepted: 5 OCT 2012
- Manuscript Revised: 2 OCT 2012
- Manuscript Received: 22 MAY 2012
- Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
- Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
xMany Africans were brought to Brazil as slaves. The runaway or abandoned slaves founded isolated communities named quilombos. There are many quilombo remnants in Vale do Ribeira region in the southern part of São Paulo State. The aim of our study was to contribute to understanding the origins of these populations, through admixture studies.
We genotyped 307 unrelated DNA samples obtained from ten quilombo populations from Vale do Ribeira region, using a panel of 48 INDEL polymorphisms. We estimated genetic differentiation between populations (FST) and genomic ancestry from these populations. Our data were compared to a similar study performed in quilombo remnants from the Brazilian Amazon region.
Population admixture estimates showed high degree of miscegenation in the quilombo remnants from Vale do Ribeira (average admixture estimates at 39.7% of African, 39.0% of European and 21.3% of Amerindian contribution). The proportions of ancestral genes varied greatly among individuals, ranging from 7.3 to 69.5%, 12.9 to 68.3%, and 7.3 to 58.5% (African, European, and Amerindian, respectively). Genetic differentiation between these populations was low (all FST values <5%), indicating gene flow between them. Both groups of quilombos, from Vale do Ribeira and Amazon, presented similar patterns of admixture.
INDEL markers were useful to evidence the triple interbreeding among African, European, and Amerindian in the formation of quilombo populations. The low FST values suggested gene flow among quilombos from Vale do Ribeira. Our data highlight the important role of Amerindians in the formation of quilombo populations. Am. J. Hum. Biol., 2013. © 2012 Wiley Periodicals, Inc.