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Distinctive effects of CCR5, CCR2, and SDF1 genetic polymorphisms in AIDS progression
H Hendel1, N Hénon, H Lebuanec
1Laboratoire de Physiologie Cellulaire, Université Pierre et Marie Curie, Paris, France.
Summary
Genetic variations in CCR5, CCR2, and SDF1 influence HIV-1 disease progression. CCR5 mutations significantly delay progression, while CCR2 and SDF1 effects are more apparent in specific genetic contexts, particularly early in infection.
Area of Science:
- Human Genetics
- Immunology
- Virology
Background:
- The Genetics of Resistance to Infection by HIV-1 (GRIV) cohort comprises 200 slow-progressor and 90 fast-progressor HIV-1 patients.
- Polymorphisms in CCR5, CCR2, and SDF1 are known to influence the rate of HIV-1 disease progression.
- Understanding the genetic basis of HIV-1 non-progression is crucial for developing therapeutic strategies.
Purpose of the Study:
- To investigate the association of CCR5, CCR2, and SDF1 polymorphisms with HIV-1 disease progression in the GRIV cohort.
- To determine the predominant role of specific genetic variations in controlling viral load and disease onset.
Main Methods:
- Genotyping of three polymorphisms in CCR5, CCR2, and SDF1 genes within the GRIV cohort.
- Statistical analysis to compare allele and genotype frequencies between slow-progressor and fast-progressor groups.
- Analysis of clinical markers (CD4 counts, viral load) in relation to genetic variations.
Main Results:
- A significant increase in mutant CCR5 alleles was observed in slow-progressors (p < .0001).
- The CCR2 64I mutant allele and SDF1-3'A/3'A genotypes showed increased prevalence in slow-progressors with wild-type CCR5.
- No significant differences in CD4 counts or viral load were found between slow-progressor groups with wild-type versus mutant alleles.
Conclusions:
- The CCR5 polymorphism plays a predominant role in slowing HIV-1 disease progression.
- CCR2 and SDF1 mutations may contribute to delayed progression, particularly in individuals with specific CCR5 genotypes, and their effects appear to be most significant early in infection.
- These genetic factors may not be influential in maintaining long-term non-progression status after several years of infection, suggesting other genetic determinants may be involved.