HIV Progression to AIDS Linked to Viral Mutations in South Africa
Author Information
Author(s): Huang Kuan-Hsiang Gary, Goedhals Dominique, Carlson Jonathan M., Brockman Mark A., Mishra Swati, Brumme Zabrina L., Hickling Stephen, Tang Christopher S. W., Miura Toshiyuki, Seebregts Chris, Heckerman David, Ndung'u Thumbi, Walker Bruce, Klenerman Paul, Steyn Dewald, Goulder Philip, Phillips Rodney, van Vuuren Cloete, Frater John
Primary Institution: Nuffield Department of Clinical Medicine, Oxford University, Oxford, United Kingdom
Hypothesis
We hypothesised that in end-stage disease there is a shifting dynamic between T cell imposed immunity and viral immune escape, which, through both compensatory and reverting viral mutations, results in increased viral fitness, elevated plasma viral loads and disease progression.
Conclusion
The study found that progression to AIDS is associated with an increase in viral fitness, which may contribute to the rise in plasma viral load frequently seen in AIDS.
Supporting Evidence
- In advanced disease, T cell responses narrow, with a decline in Gag-directed responses.
- The median viral replication capacity was higher in patients with CD4 counts <100 cells/µl compared to those with CD4 counts ≥500 cells/µl.
- Mutations at HIV Gag T186S and T242N reduced viral replication capacity, but T242N mutants demonstrated increasing replication capacity in advanced disease.
Takeaway
This study shows that as HIV disease gets worse, the virus can become better at replicating, which might make the disease progress faster.
Methodology
The study involved analyzing T cell responses and viral mutations in HIV-infected individuals from two South African cohorts, measuring immune responses and viral replication capacity.
Potential Biases
Potential bias due to the cross-sectional design and the nature of the cohorts studied.
Limitations
The study is cross-sectional rather than longitudinal, which may bias data interpretation.
Participant Demographics
Participants were untreated HIV-1 infected adults from South Africa, with a total of 1053 individuals studied.
Statistical Information
P-Value
p=0.0004
Confidence Interval
IQR: 86.1–98.0%
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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