Frequencies of CCR5-D32, CCR2-64I and SDF1-3’A mutations in Human Immunodeficiency Virus (HIV) seropositive subjects and seronegative individuals from the state of Pará in Brazilian Amazonia

Genetics and Molecular Biology

Fernanda Andreza De Pinho Lott Carvalhaes²  Greice Lemos Cardoso²  Antonio Carlos Rosário Vallinoto¹  Luiz Fernando Machado¹  Marluisa De Oliveira Guimarães Ishak¹  Ricardo Ishak¹  João Farias Guerreiro² 

[1] ,Universidade Federal do Pará Centro de Ciências Biológicas Departamento de PatologiaBelém Pará ,Brazil

关键词: CCR5;    CCR2;    SDF-1;    HIV-1 infection;    allele frequency;    Brazilian Amazon;   

DOI  :  10.1590/S1415-47572005000500004

来源: SciELO

【 摘 要 】

The distribution of genetic polymorphisms of chemokine receptors CCR5-delta32, CCR2-64I and chemokine (SDF1-3’A) mutations were studied in 110 Human Immunodeficiency Virus type 1 (HIV-1) seropositive individuals (seropositive group) and 139 seronegative individuals (seronegative group) from the population of the northern Brazilian city of Belém which is the capital of the state of Pará in the Brazilian Amazon. The CCR5-delta32 mutation was found in the two groups at similar frequencies, i.e. 2.2% for the seronegative group and 2.7% for the seropositive group. The frequencies of the SDF1-3’A mutation were 21.0% for the seronegative group and 15.4% for the seropositive group, and the CCR2-64I allele was found at frequencies of 12.5% for the seronegative group and 5.4% for the seropositive group. Genotype distributions were consistent with Hardy-Weinberg expectations in both groups, suggesting that none of the three mutations has a detectable selective effect. Difference in the allelic and genotypic frequencies was statistically significant for the CCR2 locus, the frequency in the seronegative group being twice that found in the seropositive group. This finding may indicate a protective effect of the CCR2-64I mutation in relation to HIV transmission. However, considering that the CCR2-64I mutation has been more strongly associated with a decreased risk for progression for AIDS than to the resistance to the HIV infection, this could reflect an aspect of population structure or a Type I error.

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