Abstract
CRF01_AE shows an obvious sexual transmission advantage over other major HIV-1 subtypes circulating in China. Previous studies showed that the presence or absence of potential N-linked glycosylation sites (PNGSs) in variable loops might affect HIV-1 transmission; it is therefore of interest to compare the distribution of potential PNGSs on envelopes of different subtypes circulating in China. Compared to CRF07_BC, CRF08_BC, B, and B' subtypes isolated in China, CRF01_AE subtypes isolated from both China and outside China had significantly fewer PNGSs in total and in V2/V4, while they had significantly more PNGSs in V5. HIV-1 subtype CRF01_AE has a unique PNGS distribution pattern in Gp120, which may contribute to its advantage in sexual transmission in China.
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