title: Prevalence and genetic heterogeneity of the reverse transcriptase T69S-S-X insertion in pretreated HIV-infected patients.
abstract: The emergence of resistance to antiretroviral drugs represents one of the main reasons for treatment failure in HIV-infected persons. Resistance to multiple nucleoside analogues may result from rearrangements in the HIV pol gene, in particular one insertion of two amino acids at position 69. Herein, we examined the prevalence of this resistant genotype and its genetic heterogeneity in a group of 475 healthy pretreated HIV-positive subjects in Spain. Only 4 (0.8%) carried the codon 69 insertion. It was always found coupled to the T69S mutation. The extra amino acids were S-S in 2 subjects and S-G in the other 2. The presence of the insert was seen only in subjects previously exposed to AZT monotherapy for at least 6 months.
authors.affiliation: Service of Infectious Diseases, Hospital Carlos III, Instituto de Salud Carlos III, Madrid, Spain.
authors.forename: C
authors.initials: C
authors.lastname: Briones
authors.forename: A
authors.initials: A
authors.lastname: Mas
authors.forename: M
authors.initials: M
authors.lastname: Pérez-Olmeda
authors.forename: C
authors.initials: C
authors.lastname: Altisent
authors.forename: E
authors.initials: E
authors.lastname: Domingo
authors.forename: V
authors.initials: V
authors.lastname: Soriano
mesh_terms: D019380:Anti-HIV Agents / Q000627:therapeutic use; D016049:Didanosine / Q000627:therapeutic use; D024882:Drug Resistance, Viral; D018740:Genetic Heterogeneity / Q000187:drug effects; D015658:HIV Infections / Q000188:drug therapy / Q000453:epidemiology / Q000821:virology*; D054303:HIV Reverse Transcriptase / Q000235:genetics*; D015497:HIV-1 / Q000187:drug effects / Q000201:enzymology* / Q000235:genetics; D006801:Humans; D019259:Lamivudine / Q000627:therapeutic use; D008297:Male; D016296:Mutagenesis; D015995:Prevalence; D018894:Reverse Transcriptase Inhibitors / Q000627:therapeutic use; D013030:Spain / Q000453:epidemiology; D015215:Zidovudine / Q000627:therapeutic use
chemical_list: D019380:Anti-HIV Agents; D018894:Reverse Transcriptase Inhibitors; D019259:Lamivudine; D015215:Zidovudine; D054303:HIV Reverse Transcriptase; D016049:Didanosine