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Molecular characterization of unique intersubtype HIV type 1 A1/C recombinant strain circulating in Pune, India.

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.