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Published on: August 31, 2014
HIV-1 clade B pol evolution following primary infection
George K Hightower1, Susanne J May, Josué Pérez-Santiago
1Department of Medicine, University of California San Diego, La Jolla, California United States of America.
HIV-1 pol sequence evolution differs between mono- and dual-infected individuals. Dual infection shows significantly greater genetic divergence, aiding in tracking transmission events and networks.
Area of Science:
- Virology
- Genetics
- Epidemiology
Background:
- Understanding human immunodeficiency virus type 1 (HIV-1) evolution is crucial for controlling transmission.
- Intra-individual genetic diversity of HIV-1 can be influenced by factors such as infection status and host genetics.
Purpose of the Study:
- To characterize the intra-individual evolution of the HIV-1 subtype B pol gene in antiretroviral-naive individuals.
- To investigate the impact of dual infection on HIV-1 pol genetic divergence over time.
Main Methods:
- A longitudinal cohort study of antiretroviral-naive individuals enrolled during primary infection.
- HIV-1 pol gene sequences were generated from longitudinal blood samples.
- Genetic divergence and substitution rates were analyzed in relation to mono- versus dual-infection status, HLA, CD4 count, and viral load.
Main Results:
- Participants with dual HIV-1 infection exhibited significantly greater pol gene sequence divergence (up to 7.0%) compared to mono-infected individuals (less than 0.7%).
- Global substitution rates were significantly higher in dually infected individuals (p<0.001).
- HIV-1 pol substitution rates were not associated with HLA haplotype, CD4 count, or viral load.
Conclusions:
- HIV-1 pol sequence divergence is a reliable marker distinguishing between mono- and dual-infection.
- These findings support the utility of HIV-1 pol sequence data for evaluating transmission events, networks, and the dynamics of dual HIV-1 infections.
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