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AIDS Res Hum Retroviruses. 2007 Aug;23(8):1062-5.

Genotypic analysis of the protease and reverse transcriptase of HIV type 1 isolates from recently infected injecting drug users in western China.

Author information

1
Division of Virology and Immunology, State Key Laboratory for Infectious Disease Prevention and Control, National Center for AIDS/STD Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China.

Abstract

The partial pol gene was analyzed to determine circulating HIV-1 subtypes and the prevalence of drug resistance among recently infected injecting drug users in the west of China. Phylogenetic and bootscanning analyses showed that all 25 sequences belonged to CRF07_BC. No major drug resistance mutations were found, while the CRF07_BC sequences harbored a few highly prevalent polymorphic positions in both the protease and reverse transcriptase regions. It is notable that D60E, L63P and I93L substitutions, which were more common in HIV-1 isolates from PI-treated than untreated patients, were present in most of the isolates. Compared with subtype B, the CRF07_BC strains had a decreased genetic barrier for the V106M mutation, which is selected by efavirenz and leads to high-level resistance to all present nonnucleoside RT inhibitors. Further studies are needed to determine the impact of genetic features of CRF07-BC on antitretroviral susceptibility and evolution of drug resistance mutations.

PMID:
17725425
DOI:
10.1089/aid.2007.0050
[Indexed for MEDLINE]

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