TY - JOUR
T1 - Genotypic analysis of the gp41 HR1 region from HIV-1 isolates from enfuvirtide-treated and untreated patients
AU - Pessoa, Luciana Santos
AU - Valadão, Ana Luiza Chaves
AU - Abreu, Celina Monteiro
AU - Calazans, Alexandre Rodrigues
AU - Martins, Angélica Nascimento
AU - Azevedo, Suwellen S.S.D.
AU - Couto-Fernandez, José Carlos
AU - Azevedo, Marcelo C.M.V.
AU - Tanuri, Amilcar
PY - 2011/8/15
Y1 - 2011/8/15
N2 - Objective: To evaluate the polymorphisms and resistance mutations in gp41 HR1 region of HIV-1. Methods: The study included 28 HIV-positive patients undergoing enfuvirtide (ENF) treatment or not from Porto Alegre, Rio Grande do Sul state, and Rio de Janeiro, Rio de Janeiro state, between 2006 and 2009. Resistance mutations and polymorphisms of the gp41 HR1 region were detected using the genomic DNA of 12 ENF-untreated patients and 16 patients in ENF treatment, encompassing subtypes B, C, and F1. Sample subtypes were determined by neighbor-joining phylogenetic analysis with a Kimura's two-parameter correction. Results: A high prevalence of polymorphisms unrelated to resistance was observed. Among ENF-untreated patients, 16% showed mutations related with resistance. Among patients in ENF treatment, 50% had resistance-related mutations. Overall, 17% of all isolates showed the N42S polymorphism related to ENF hypersusceptibility. The presence of ENF resistance mutations in the group of treated patients reduced viral load. The V38A substitution was the most frequent among treatment-experienced patients followed by the G36D/E, N42D, and V38M substitutions. Conclusions: The V38A substitution in the gp41 HR region was the most common resistance mutation among ENF-treated patients and was associated with increased viral load.
AB - Objective: To evaluate the polymorphisms and resistance mutations in gp41 HR1 region of HIV-1. Methods: The study included 28 HIV-positive patients undergoing enfuvirtide (ENF) treatment or not from Porto Alegre, Rio Grande do Sul state, and Rio de Janeiro, Rio de Janeiro state, between 2006 and 2009. Resistance mutations and polymorphisms of the gp41 HR1 region were detected using the genomic DNA of 12 ENF-untreated patients and 16 patients in ENF treatment, encompassing subtypes B, C, and F1. Sample subtypes were determined by neighbor-joining phylogenetic analysis with a Kimura's two-parameter correction. Results: A high prevalence of polymorphisms unrelated to resistance was observed. Among ENF-untreated patients, 16% showed mutations related with resistance. Among patients in ENF treatment, 50% had resistance-related mutations. Overall, 17% of all isolates showed the N42S polymorphism related to ENF hypersusceptibility. The presence of ENF resistance mutations in the group of treated patients reduced viral load. The V38A substitution was the most frequent among treatment-experienced patients followed by the G36D/E, N42D, and V38M substitutions. Conclusions: The V38A substitution in the gp41 HR region was the most common resistance mutation among ENF-treated patients and was associated with increased viral load.
KW - HIV-1
KW - antiviral drug resistance
KW - enfuvirtide
KW - gp41
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U2 - 10.1097/QAI.0b013e31821e9d29
DO - 10.1097/QAI.0b013e31821e9d29
M3 - Article
C2 - 21857318
AN - SCOPUS:79960813012
SN - 1525-4135
VL - 57
SP - S197-S201
JO - Journal of Acquired Immune Deficiency Syndromes
JF - Journal of Acquired Immune Deficiency Syndromes
IS - SUPPL. 3
ER -