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Inferring paternal history of rural African-derived Brazilian populations from Y chromosomes

Inferring paternal history of rural African-derived Brazilian populations from Y chromosomes

Author(s): Kimura, L., Nunes, K., Macedo‐Souza, L.I., Rocha, J., Meyer, D. and Mingroni‐Netto, R.C.
Journal: American Journal of Human Biology
Issue/Volume: in press
Page(s): in press
Year: 2017

Abstract:

Objectives

Quilombo remnants are relics of communities founded by runaway or abandoned African slaves, but often with subsequent extensive and complex admixture patterns with European and Native Americans. We combine a genetic study of Y-chromosome markers with anthropological surveys in order to obtain a portrait of quilombo structure and history in the region that has the largest number of quilombo remnants in the state of São Paulo.

Methods

Samples from 289 individuals from quilombo remnants were genotyped using a set of 17 microsatellites on the Y chromosome (AmpFlSTR-Yfiler). A subset of 82 samples was also genotyped using SNPs array (Axiom Human Origins—Affymetrix). We estimated haplotype and haplogroup frequencies, haplotype diversity and sharing, and pairwise genetic distances through FST and RST indexes.

Results

We identified 95 Y chromosome haplotypes, classified into 15 haplogroups. About 63% are European, 32% are African, and 6% Native American. The most common were: R1b (European, 34.2%), E1b1a (African, 32.3%), J1 (European, 6.9%), and Q (Native American, 6.2%). Genetic differentiation among communities was low (FST = 0.0171; RST = 0.0161), and haplotype sharing was extensive. Genetic, genealogical and oral surveys allowed us to detect five main founder haplotypes, which explained a total of 27.7% of the Y chromosome lineages.

Conclusions

Our results showed a high European patrilineal genetic contribution among the founders of quilombos, high amounts of gene flow, and a recent common origin of these populations. Common haplotypes and genealogical data indicate the origin of quilombos from a few male individuals. Our study reinforces the importance of a dual approach, involving the analysis of both anthropological and genetic data.


Source Link: http://onlinelibrary.wiley.com/wol1/doi/10.1002/ajhb.22930/abstract

Keywords

Peoples: African Brazilians | Places: Brazil | Topics: | DNA Type: Y-DNA

2017-01-20T12:15:39+00:00 January 20th, 2017|