title: Absence of the deltaccr5 mutation in indigenous populations of the Brazilian Amazon.
abstract: Carriers of the deltaccr5 allele, which contains a deletion of 32 bases in relation to the normal allele of the beta-chemokine receptor gene (CCR5), have increased resistance to HIV-1 infection. The higher frequency of this mutation in Europeans than in Blacks and Asians, has generated interest in determining its distribution in other populations. The population of this study involved 300 Amerindians from four Brazilian Amazon tribes (Tikuna, Baniwa, Kashinawa, and Kanamari). All of the individuals were homozygous for the normal allele, which corroborates the hypothesis that the deltaccr5 allele has a European origin, and that its occurrence in urban populations in South America is the result of immigration.
authors.affiliation: Departamento de Genética, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Brasil.
authors.forename: A P
authors.initials: AP
authors.lastname: Leboute
authors.forename: M W
authors.initials: MW
authors.lastname: de Carvalho
authors.forename: A L
authors.initials: AL
authors.lastname: Simões
mesh_terms: D000483:Alleles; D001938:Brazil; D004641:Emigration and Immigration; D005060:Europe; D005787:Gene Frequency; D015658:HIV Infections / Q000235:genetics; D006720:Homozygote; D006801:Humans; D007199:Indians, South American / Q000235:genetics*; D011110:Polymorphism, Genetic; D019713:Receptors, CCR5 / Q000235:genetics*; D017384:Sequence Deletion; D044465:White People / Q000235:genetics
chemical_list: D019713:Receptors, CCR5