Rolland M, Carlson JM, Manocheewa S, Swain JV, Lanxon-Cookson E, Deng W, Rousseau CM, Raugi DN, Learn GH, Maust BS, Coovadia H, Ndung'u T, Goulder PJ, Walker BD, Brander C, Heckerman DE, Mullins JI (2010). Amino-acid co-variation in HIV-1 Gag subtype C: HLA-mediated selection pressure and compensatory dynamics. PloS one (ePub ahead of print). (pubmed) (doi)
Despite high potential for HIV-1 genetic variation, the emergence of some mutations is constrained by fitness costs, and may be associated with compensatory amino acid (AA) co-variation. To characterize the interplay between Cytotoxic T Lymphocyte (CTL)-mediated pressure and HIV-1 evolutionary pathways, we investigated AA co-variation in Gag sequences obtained from 449 South African individuals chronically infected with HIV-1 subtype C.