Characterization of a New HIV-1 CRF01_AE/CRF07_BC Recombinant Virus Form Among Men Who Have Sex with Men in Beijing, China.

Recent studies have revealed that three major viral strains (CRF07_BC, CRF01_AE, and subtype B) have been cocirculating among men who have sex with men in Beijing. Cocirculation of multiple subtypes in the same population contributes significantly to the emergence of recombinant viruses. This study reports a near full-length genome of a novel, second-generation HIV-1 recombinant (BJ2015EU16) between CRF07_BC and CRF01_AE. The analysis of BJ2015EU16 shows that the genome comprises three interlaced segments, including two CRF07_BC and one CRF01_AE segments, with CRF07_BC as the backbone. There were two recombinant breakpoints in the vpu and env genes of BJ2015EU16. This is different from a previously identified CRF01_AE/07_BC recombinant strain from Beijing. The new emergence of the unique recombinant form increases the complexity of the HIV epidemic in the Beijing homosexual group, and the ongoing generation of recombinant viruses may provide an important basis for future analysis of the recombination mechanism of HIV-1.