The Role of Immune Response in HIV-2 Envelope Evolution
Author Information
Author(s): Pedro Borrego, José Maria Marcelino, Cheila Rocha, Manuela Doroana, Francisco Antunes, Fernando Maltez, Perpétua Gomes, Carlos Novo, Helena Barroso, Nuno Taveira
Primary Institution: Faculdade de Farmácia de Lisboa
Hypothesis
This study investigates the short-term molecular evolution of the HIV-2 C2, V3, and C3 envelope regions and its association with the immune response.
Conclusion
The evolutionary dynamics of HIV-2 envelope during chronic infection is similar to HIV-1, indicating active replication in cellular compartments.
Supporting Evidence
- The mean intra-host nucleotide diversity was 2.1%, increasing along the course of infection in most patients.
- Diversity at the amino acid level was significantly lower for the V3 region and higher for the C2 region.
- The average divergence rate was 0.014 substitutions/site/year, similar to that reported in chronic HIV-1 infection.
- N-glycosylation sites located in C2 and V3 were conserved in all patients along the course of infection.
- C2V3C3-specific IgG antibodies are effective at reducing viral population size limiting the number of virus escape mutants.
Takeaway
Researchers studied how HIV-2 changes over time in patients and found that the virus is still active even when patients have low viral loads.
Methodology
Clonal sequences of the env C2V3C3 region were obtained from a cohort of eighteen HIV-2 chronically infected patients followed prospectively during 2–4 years.
Limitations
The study had a limited sample size and focused only on specific regions of the HIV-2 genome.
Participant Demographics
Eighteen HIV-2 patients attending different hospitals in Lisbon, Portugal, with varying CD4+ T cell counts.
Statistical Information
P-Value
p<0.05
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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