title: Determination of gag subtypes of HIV type 1 detected among female sex workers in Calcutta, India.
abstract: HIV-1 subtyping is important to study the changing scenario of genetic variation. The gag-based heteroduplex mobility assay (gag-HMA) was developed and evaluated as a powerful and reliable technique for identifying the HIV-1 group M subtypes A to H and the circulating recombinant forms (CRFs). To study the subtype distribution of HIV-1 strains from the eastern part of India, we used the gag-based HMA, followed by the sequencing and phylogenetic analysis. Blood samples from HIV-1-seropositive female sex workers in Calcutta were subjected to gag-HMA. The most prevalent subtype was found to be the C type, among which the C4 subsubtype was prevalent. However, a number of nontypable C strains were found in gag-HMA. Phylogenetic analysis revealed the discrete nature of the C strains and no monophyletic cluster was noticed. This result might indicate a growing tendency of variations among the HIV-1 type C strains circulating in eastern India.
authors.affiliation: National Institute of Cholera and Enteric Diseases, ICMR, Calcutta-700010, India.
authors.forename: Satarupa
authors.initials: S
authors.lastname: Sengupta
authors.forename: Smarajit
authors.initials: S
authors.lastname: Jana
authors.forename: Kamalesh
authors.initials: K
authors.lastname: Sarkar
authors.forename: Sujit K
authors.initials: SK
authors.lastname: Bhattacharya
authors.forename: Sekhar
authors.initials: S
authors.lastname: Chakrabarti
mesh_terms: D005260:Female; D015683:Gene Products, gag / Q000235:genetics; D006679:HIV Seropositivity / Q000453:epidemiology*; D015497:HIV-1 / Q000235:genetics*; D006801:Humans; D007194:India / Q000453:epidemiology; D017720:Molecular Epidemiology; D008969:Molecular Sequence Data; D010802:Phylogeny; D011477:Sex Work
chemical_list: D015683:Gene Products, gag