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In this study, we sequenced the full-length HIV type 2 (HIV-2) long terminal repeat region from the proviral DNA of 23 HIV-2-infected individuals from the southern parts of India. We identified two different promoter variant strains circulating in this region along with the globally circulating common promoter variant. Seven sequences had an additional nuclear factor kappa-light chain enhancer of activated B cells (NF-κB) binding motif and the sequence from another subject showed one NF-κB and one RBE-III binding site. Phylogenetic and subtyping analyses revealed that the circulating strains comprised HIV-2 subtype A. The occurrence of two NF-κB binding sites in ∼30% of the sequences analyzed in our study prompts us to hypothesize that as in the case of HIV-1 subtype C viruses that possess additional κB sites, the two NF-κB HIV-2 variants might possess superior replication fitness because of the increased magnitude of transcription, thus leading to the expansion of these variants in the country.

Genetic Characterization of Full-Length HIV-2 Long Terminal Repeat Sequences: Identification of Rare Promoter Variants