CCR5 Gene Variants and HIV Transmission from Mother to Child in Malawi
Author Information
Author(s): Bonnie R. Pedersen, Deborah Kamwendo, Melinda Blood, Victor Mwapasa, Malcolm Molyneux, Kari North, Stephen J. Rogerson, Peter Zimmerman, Steven R. Meshnick
Primary Institution: University of North Carolina, Chapel Hill, North Carolina, United States of America
Hypothesis
Are CCR5 gene polymorphisms associated with the risk of mother-to-child transmission of HIV in infants?
Conclusion
The study found that specific CCR5 SNPs provide protection against HIV transmission from mother to child at low maternal viral loads.
Supporting Evidence
- The study included 552 infants of HIV-positive mothers.
- Statistically significant protection against MTCT was observed for CCR5 SNPs -2459G and -2135T at low maternal viral loads.
- No child carried the CCR5 Δ32 SNP.
- Maternal viral load was found to be an effect measure modifier.
Takeaway
Some babies are less likely to get HIV from their moms if they have certain gene changes, especially when their moms have low amounts of the virus.
Methodology
The study genotyped blood samples from infants of HIV-positive mothers and analyzed the association between CCR2/CCR5 haplotypes and HIV transmission using log-linear regression.
Potential Biases
Potential biases due to missing data and the specific population studied.
Limitations
The study had incomplete data for maternal viral load for some participants and was conducted in a specific population, which may limit generalizability.
Participant Demographics
Infants of HIV-positive women in Malawi, with a mean maternal viral load of 4.67.
Statistical Information
P-Value
0.05
Confidence Interval
0.27–0.91
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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