Abstract
An increasing number of circulating recombinant forms (CRFs) and unique recombinant forms (URFs) all over the world has necessitated being vigilant about new recombinants. Since the first report of a recombinant virus with an A1/C mosaic in 1998 more and more B/C and A/C recombinant viruses are being reported from India. Here we report the identification and characterization of a unique HIV-1 A1/C recombinant circulating in Western India. Analysis of the full-length genome using RIP, SimPlot, and jpHMM@Gobics has confirmed its mosaic structure with insertion of subtype A1 in the backbone of subtype C at three positions: gag-pol (1973±15-2617±47), pol-vif (4879±37-5582±32), and gp41 (8437±106-8811±8); however, RIP and SimPlot showed one more small insertion in integrase (4343-4519). Phylogenetic analysis confirmed that the recombinant virus has an insertion of clade A1 in the backbone of subtype C, which has come from Indian subtype C.
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