Influence of CCR5 and CCR2 genetic variants in the resistance/susceptibility to HIV in serodiscordant couples from Colombia

AIDS Res Hum Retroviruses. 2013 Dec;29(12):1594-603. doi: 10.1089/aid.2012.0299. Epub 2013 Nov 9.

Abstract

The main genetic factor related to HIV-1 resistance is the CCR5-Δ32 mutation; however, the homozygous genotype is uncommon. The CCR5-Δ32 mutation along with single nucleotide polymorphisms (SNPs) in the CCR5 promoter and the CCR2-V64I mutation have been included in seven human haplogroups (HH) previously associated with resistance/susceptibility to HIV-1 infection and different rates of AIDS progression. Here, we determined the association of the CCR5 promoter SNPs, the CCR5-Δ32 mutation, CCR2-V64I SNP, and HH frequencies with resistance/susceptibility to HIV-1 infection in a cohort of HIV-1-serodiscordant couples from Colombia. Seventy HIV-1-exposed, but seronegative (HESN) individuals, 57 seropositives (SP), and 112 healthy controls (HC) were included. The CCR5-Δ32 mutation and CCR2-V64I SNP were identified by PCR, and the CCR5 promoter SNPs were evaluated by sequencing. None of the individuals exhibited a homozygous Δ32 genotype; the CCR2-I allele was more frequent in HESN (34%) than HC (23%) (p=0.039, OR=1.672). The frequency of the 29G allele was higher in SP than HC (p=0.003, OR=3). HHF2 showed a higher frequency in HC (19%) than SP (9%) (p=0.027), while HHG1 was more frequent in SP (11.1%) than in HC (4.2%) (p=0.019). The AGACCAC-CCR2-I-CCR5 wild-type haplotype showed a higher frequency in SP (14.2%) than in HC (3.7%) (p=0.001). In conclusion, the CCR5-Δ32 allele is not responsible for HIV-1 resistance in this HESN group; however, the CCR2-I allele could be protective, while the 29G allele might increase the likelihood of acquiring HIV-1 infection. HHG1 and the AGACCAC-CCR2-I-CCR5 wild-type haplotype might promote HIV-1 infection while HHF2 might be related to resistance. However, additional studies are required to evaluate the implications of these findings.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Base Sequence
  • Colombia
  • DNA Primers
  • Drug Resistance, Viral
  • Genetic Predisposition to Disease*
  • HIV Infections / genetics*
  • Humans
  • Linkage Disequilibrium
  • Mutation
  • Polymorphism, Single Nucleotide
  • Promoter Regions, Genetic
  • Receptors, CCR2 / genetics*
  • Receptors, CCR5 / genetics*
  • Sexual Partners*

Substances

  • CCR2 protein, human
  • CCR5 protein, human
  • DNA Primers
  • Receptors, CCR2
  • Receptors, CCR5