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Race-specific HIV-1 disease-modifying effects associated with CCR5 haplotypes
E Gonzalez1, M Bamshad, N Sato
1Department of Medicine, University of Texas Health Science Center at San Antonio, San Antonio, TX, 78229-3900, USA.
Summary
Genetic variations in the CCR5 gene impact HIV-1 progression differently across populations. Understanding the evolutionary history of CCR5 haplotypes is crucial for predicting disease outcomes in diverse individuals.
Area of Science:
- Immunogenetics
- Virology
- Population Genetics
Background:
- Genetic variations in CC chemokine receptor 5 (CCR5) influence HIV-1 transmission and disease progression.
- It is generally assumed that CCR5 genotypes have similar phenotypic effects across different populations.
Purpose of the Study:
- To investigate the population-specific effects of CCR5 haplotypes on HIV-1 disease progression.
- To test the assumption of similar phenotypic effects of CCR5 genotypes in diverse populations.
Main Methods:
- Utilized an evolutionary-based classification of CCR5 haplotypes.
- Analyzed a large, racially mixed cohort of HIV-1-seropositive individuals.
- Examined the association between CCR5 haplotypes and HIV-1 disease progression.
Main Results:
- The spectrum of CCR5 haplotypes associated with disease acceleration or retardation differs between African Americans and Caucasians.
- Demonstrated a strong interactive effect between CCR5 haplotypes with different evolutionary histories.
- Highlighted population-specific phenotypic effects of CCR5 haplotypes.
Conclusions:
- The evolutionary context of disease susceptibility genes is critical for understanding their expression.
- CCR5 haplotype effects on HIV-1 disease progression are population-specific, challenging previous assumptions.
- Future research should consider evolutionary history when assessing genetic influences on disease.