Genome-wide analysis in Brazilian Xavante Indians reveals low degree of admixture.
Characterization of population genetic variation and structure can be used as tools for research in human genetics and population isolates are of great interest. The aim of the present study was to characterize the genetic structure of Xavante Indians and compare it with other populations. The Xavante, an indigenous population living in Brazilian Central Plateau, is one of the largest native groups in Brazil. A subset of 53 unrelated subjects was selected from the initial sample of 300 Xavante Indians. Using 86,197 markers, Xavante were compared with all populations of HapMap Phase III and HGDP-CEPH projects and with a Southeast Brazilian population sample to establish its population structure. Principal Components Analysis showed that the Xavante Indians are concentrated in the Amerindian axis near other populations of known Amerindian ancestry such as Karitiana, Pima, Surui and Maya and a low degree of genetic admixture was observed. This is consistent with the historical records of bottlenecks experience and cultural isolation. By calculating pair-wise F(st) statistics we characterized the genetic differentiation between Xavante Indians and representative populations of the HapMap and from HGDP-CEPH project. We found that the genetic differentiation between Xavante Indians and populations of Ameridian, Asian, European, and African ancestry increased progressively. Our results indicate that the Xavante is a population that remained genetically isolated over the past decades and can offer advantages for genome-wide mapping studies of inherited disorders.
Disciplina de Endocrinologia, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, Brazil.
Patricia C
PC
Kuhn
Andréa R V Russo
AR
Horimoto
José Maurício
JM
Sanches
João Paulo B
JP
Vieira Filho
Luciana
L
Franco
Amaury Dal
AD
Fabbro
Laercio Joel
LJ
Franco
Alexandre C
AC
Pereira
Regina S
RS
Moises
D001938:Brazil / Q000208:ethnology; D003430:Cross-Sectional Studies; D005006:Ethnicity / Q000235:genetics; D014644:Genetic Variation; D005828:Genetics, Population; D060148:HapMap Project; D006801:Humans; D007199:Indians, South American / Q000235:genetics*; D008957:Models, Genetic; D020641:Polymorphism, Single Nucleotide; D044382:Population Groups / Q000235:genetics