Premium
Genomic ancestry of rural African‐derived populations from Southeastern Brazil
Author(s) -
Kimura Lilian,
RibeiroRodrigues Elzemar Martins,
De Mello Auricchio Maria Teresa Balester,
Vicente João Pedro,
Batista Santos Sidney Emanuel,
MingroniNetto Regina Célia
Publication year - 2012
Publication title -
american journal of human biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.559
H-Index - 81
eISSN - 1520-6300
pISSN - 1042-0533
DOI - 10.1002/ajhb.22335
Subject(s) - indel , gene flow , genetic genealogy , genetic admixture , amazon rainforest , population , geography , biology , ancestry informative marker , demography , allele frequency , genetic variation , ecology , genetics , genotype , gene , single nucleotide polymorphism , sociology
Objectives: 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. Methods: 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 ( F ST ) and genomic ancestry from these populations. Our data were compared to a similar study performed in quilombo remnants from the Brazilian Amazon region. Results: 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 F ST values <5%), indicating gene flow between them. Both groups of quilombos , from Vale do Ribeira and Amazon, presented similar patterns of admixture. Conclusions: INDEL markers were useful to evidence the triple interbreeding among African, European, and Amerindian in the formation of quilombo populations. The low F ST 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.