Distribution of the CCR5delta32 allele (gene variant CCR5) in Rondônia, Western Amazonian region, Brazil

Genetics and Molecular Biology

Josileide Duarte De Farias²  Marlene Guimarães Santos²  Andonai Krauze De França¹  Daniel Delani¹  Mauro Shugiro Tada¹  Almeida Andrade Casseb¹  Aguinaldo Luiz Simões¹  Vera Engracia² 

[1] ,Instituto de Pesquisas em Patologias Tropicais Laboratório de Genética Humana Porto Velho RO ,Brazil

关键词: CCR5;    CCR5Δ32;    Rondônia;    genetic polymorphism;    allele frequency;   

DOI  :  10.1590/S1415-47572012005000003

来源: SciELO

【 摘 要 】

Since around 1723, on the occasion of its initial colonization by Europeans, Rondonia has received successive waves of immigrants. This has been further swelled by individuals from northeastern Brazil, who began entering at the beginning of the twentieth century. The ethnic composition varies across the state according to the various sites of settlement of each wave of immigrants. We analyzed the frequency of the CCR5L32 allele of the CCR5 chemokine receptor, which is considered a Caucasian marker, in five sample sets from the population. Four were collected in Porto Velho, the state capital and the site of several waves of migration. Of these, two, from the Hospital de Base were comprised of HB Mothers and HB Newborns presenting allele frequencies of 3.5% and 3.1%, respectively, a third from the peri-urban neighborhoods of Candelária/Bate-Estaca (1.8%), whereas a fourth, from the Research Center on Tropical Medicine/CEPEM (0.6%), was composed of malaria patients under treament. The fifth sample (3.4%) came from the inland Quilombola village of Pedras Negras. Two homozygous individuals (CCR5Δ32/CCR5Δ32) were detected among the HB Mother samples. The frequency of this allele was heterogeneous and higher where the European inflow was more pronounced. The presence of the allele in Pedras Negras revealed European miscegenation in a community largely comprising Quilombolas.

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