title: Genotypic analysis of the protease and reverse transcriptase of HIV type 1 isolates from recently infected injecting drug users in western 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.
authors.affiliation: 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.
authors.forename: Lingjie
authors.initials: L
authors.lastname: Liao
authors.forename: Hui
authors.initials: H
authors.lastname: Xing
authors.forename: Xinping
authors.initials: X
authors.lastname: Li
authors.forename: Yuhua
authors.initials: Y
authors.lastname: Ruan
authors.forename: Yuanzhi
authors.initials: Y
authors.lastname: Zhang
authors.forename: Guangming
authors.initials: G
authors.lastname: Qin
authors.forename: Yiming
authors.initials: Y
authors.lastname: Shao
mesh_terms: D019380:Anti-HIV Agents / Q000494:pharmacology; D002681:China; D024882:Drug Resistance, Viral / Q000235:genetics*; D015658:HIV Infections / Q000150:complications / Q000821:virology; D016333:HIV Protease / Q000235:genetics*; D054303:HIV Reverse Transcriptase / Q000235:genetics*; D015497:HIV-1 / Q000187:drug effects / Q000201:enzymology / Q000235:genetics*; D006801:Humans; D008969:Molecular Sequence Data; D011110:Polymorphism, Genetic; D015995:Prevalence; D015819:Substance Abuse, Intravenous / Q000150:complications*
chemical_list: D019380:Anti-HIV Agents; D054303:HIV Reverse Transcriptase; D016333:HIV Protease