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Vol. 14. Issue 4.
Pages 360-371 (July - August 2010)
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Vol. 14. Issue 4.
Pages 360-371 (July - August 2010)
Original article
Open Access
HIV-1 genotypic resistance profile of patients failing antiretroviral therapy in Paraná, Brazil
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Paula Virginia Michelon Toledo1,
Corresponding author
paulavmtoledo@yahoo.com.br

Correspondence to: Travessa Amando Mann, 92 sobrado 2 Curitiba – Paraná – Brazil. CEP: 80430-010. Tel.: +55-41-37796018; 88940327; fax: +55-41-37796018.
, Denise Siqueira de Carvalho1, Luiza Romagnoli1, Gustavo Marcinko1, Clovis Arns da Cunha1, Margely Nunes de Souza2, Rodrigo Brindeiro3, Flávio de Queiroz-Telles1
1 Universidade Federal do Paraná, Curitiba, PR, Brazil
2 Centro de Medicamentos do Paraná, Curitiba, PR, Brazil
3 Virology Laboratory, National Genotyping Network, Universidade Federal do Rio de Janeiro, RJ, Brazil
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Under a Creative Commons license
Article information
Abstract

Antiretroviral therapy (ART) has reduced morbidity and mortality related to human immunodeficiency virus (HIV) infection, but in spite of this advance, HIV mutations decrease antiretroviral susceptibility, thus contributing to treatment failure in patients. Genotyping HIV-1 allows the selection of new drugs after initial drug failure. This study evaluated the genotypic profile of HIV-1 isolates from treated (drug-experienced) patients in Paraná, Brazil. The prevalence of mutations in reverse transcriptase (RT) and protease (PR) genes were assessed. We analyzed 467 genotypes of patients with HIV-1 viral loads above 1,000 copies/mL. Mutations at HIV-1 RT and PR genes and previously used ART regimens were recorded. The most prevalent RT mutations were: 184V (68.31%), 215YF (51.6%), 103NS (46%), 41L (39.4%), 67N (38.54%), 210W (23.5%), 190ASE (23.2%), and 181C (17.4%). PR mutations were 90M (33.33%), 82ATFS (29%), 46I (26.8%) and 54V (22.2%). The prevalence of mutations was in line with previous national and international reports, except to non-nucleoside analogue reverse transcriptase inhibitors related mutations, which were more prevalent in this study. Previous exposure to antiretroviral drugs was associated with genotypic resistance to specific drugs, leading to treatment failure in HIV patients.

Keywords:
HIV-1
genotype
antiretrovirals
drug-experienced patients
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