title: Inferring paternal history of rural African-derived Brazilian populations from Y chromosomes.
abstract: OBJECTIVE
  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 FSTand RSTindexes.
  
  
  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.
authors.affiliation: Departamento de Genética e Biologia Evolutiva, Instituto de Biociências, Universidade de São Paulo, Rua do Matão, 277, São Paulo, CEP, 05508-090, Brazil.
authors.forename: Lilian
authors.initials: L
authors.lastname: Kimura
authors.affiliation: Departamento de Genética e Biologia Evolutiva, Instituto de Biociências, Universidade de São Paulo, Rua do Matão, 277, São Paulo, CEP, 05508-090, Brazil.
authors.forename: Kelly
authors.initials: K
authors.lastname: Nunes
authors.affiliation: Departamento de Genética e Biologia Evolutiva, Instituto de Biociências, Universidade de São Paulo, Rua do Matão, 277, São Paulo, CEP, 05508-090, Brazil.
authors.forename: Lúcia Inês
authors.initials: LI
authors.lastname: Macedo-Souza
authors.affiliation: Departamento de Biologia, Faculdade de Ciências, Universidade do Porto, Rua Campo Alegre, s/n, Porto, 4169-007, Portugal.
authors.forename: Jorge
authors.initials: J
authors.lastname: Rocha
authors.affiliation: Departamento de Genética e Biologia Evolutiva, Instituto de Biociências, Universidade de São Paulo, Rua do Matão, 277, São Paulo, CEP, 05508-090, Brazil.
authors.forename: Diogo
authors.initials: D
authors.lastname: Meyer
authors.affiliation: Departamento de Genética e Biologia Evolutiva, Instituto de Biociências, Universidade de São Paulo, Rua do Matão, 277, São Paulo, CEP, 05508-090, Brazil.
authors.forename: Regina Célia
authors.initials: RC
authors.lastname: Mingroni-Netto
mesh_terms: D044383:Black People / Q000235:genetics; D001938:Brazil; D041322:Chromosomes, Human, Y / Q000235:genetics*; D006239:Haplotypes; D006801:Humans; D018895:Microsatellite Repeats; D000072740:Paternal Inheritance; D020641:Polymorphism, Single Nucleotide; D012424:Rural Population
keywords: African-Brazilian communities; Y-chromosome; anthropological data; founder haplotypes; genetic data