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Genetic Diversity of HIV-1 Gene vif Among Treatment-Naive Brazilians.
AIDS Research and Human Retroviruses 2017 September
HIV-1 has the Vif protein, which binds to human antiviral proteins APOBEC3 to form complexes to be degraded by cellular proteolysis. To further explore HIV-1 diversity at the population level, we analyzed blood samples from 317 treatment-naive patients in Brazil. In this study, we explored the correlations of Vif polymorphisms with clinical parameters of the patients and found that mutation K22H is associated with low CD4+ cell counts and higher viral loads. Phylogenetic analysis of the vif gene indicated that subtype B was predominant in ∼77% (243/317) of the patients, followed by HIV-1 F ∼18% (56/317), and subtype C ∼4% (12/317); five samples were BF recombinants (∼1% of patients), and one was an AG recombinant. On the basis of the vif gene, we detected the presence of one AG and several previously unknown BF intersubtypes in this population. The global mean diversity, measured by pairwise distances, was 0.0931 ± 0.0006 among sequences of subtype B (n = 243), whereas the mean diversity of subtype C sequences (n = 12) was 0.0493 ± 0.001 and that of subtype F (n = 56) was 0.050 ± 0.001.
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