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HIV-1 CRF07_BC with a Seven Amino Acid Deletion in the gag p6 Region Dominates in HIV-1-Infected Men Who Have Sex with Men in China.
AIDS Research and Human Retroviruses 2017 September
We examined sequence variation in the HIV-1 gag p6 region from 27 individuals infected with HIV-1 CRF07_BC. An additional 269 gag p6 sequences of CRF07_BC from the Los Alamos National Laboratory database were also analyzed. A unique deletion of seven amino acid (aa) (p6Δ7) (aa 30-36, PIDKELY, in the HXB2 genome) was observed to exist exclusively in CRF07_BC. Indeed, 54.1% (160/296) of the CRF07_BC sequences contained the p6Δ7 mutation. The prevalence of the p6Δ7 mutation was 37.2% (29/78) and 92.3% (48/52) in CRF07_BC-infected intravenous drug users and men who have sex with men (MSM), respectively. Our results demonstrate that the p6Δ7 mutation dominates in MSM infected by HIV-1 CRF07_BC in China and suggests that this deletion could serve as a useful marker for monitoring HIV-1 evolution and epidemic. In future studies, it will be of interest to determine whether such genotypic variation influences viral replication capacity and disease progression.
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