Prevalence of chemokine and chemokine receptor polymorphisms in seroprevalent children with symptomatic HIV-1 infection in the United States.

Several chemokines and chemokine receptors are involved in HIV-1 infection, disease progression, and transmission. We studied the prevalence of genetic variations in CCR2, SDF1, and the CCR5 gene and its promoter region at positions 59029, 59353, and 59356 in a seroprevalent cohort of 1057 children with symptomatic HIV-1 infection in the United States. The percentage of children with the CCR5-wt/Delta32 genotype was significantly higher for white, non-Hispanic children (15%) than for Hispanic (6%) or black, non-Hispanic children (4%). For the CCR5-59029-G/A, CCR5-59353-T/C, and CCR5-59356-C/T polymorphisms, there were significant or marginally significant differences in genotype frequencies across race/ethnicity groups. For the CCR2-wt/64I polymorphism, both black, non-Hispanic and Hispanic children had a higher frequency of the CCR2-wt/64I genotype (24% and 21%, respectively) and CCR2-64I/64I genotype (4% and 3%, respectively) than white, non-Hispanic children (14% and 2%, respectively). For the SDF1-3'-G/A polymorphism, black, non-Hispanic children had a lower combined frequency of the SDF1-3'-G/A and SDF1-3'-A/A genotypes (15%) than did Hispanic children (33%) and white, non-Hispanic children (37%). These analyses show that the distribution of chemokine receptor and chemokine genetic polymorphisms varies significantly across race/ethnicity subgroups of HIV-1-infected children in the United States.