HIV-2 Integrase Polymorphisms and Longitudinal Genotypic Analysis of HIV-2 Infe...

• Author(s): Cavaco-Silva, J ; Abecasis, A ; Miranda, AC ; Poças, J ; Narciso, J ; Águas, MJ ; Maltez, F ; Almeida, I ; Germano, I ; Diniz, A ; Gonçalves, MF ; Gomes, P ; Cunha, C ; Camacho, RJ
• Date: 2014
• Persistent ID: http://hdl.handle.net/10400.17/1771
• Origin: Repositório do Centro Hospitalar de Lisboa Central, EPE
• Subject(s): HCC INF; HIV-2; Polimorfismo Genético
• Document Type: Article
• Language: English

Description

To characterize the HIV-2 integrase gene polymorphisms and the pathways to resistance of HIV-2 patients failing a raltegravir-containing regimen, we studied 63 integrase strand transfer inhibitors (INSTI)-naïve patients, and 10 heavily pretreated patients exhibiting virological failure while receiving a salvage raltegravir-containing regimen. All patients were infected by HIV-2 group A. 61.4% of the integrase residues were conserved, including the catalytic motif residues. No INSTI-major resistance mutations were detected in the virus population from naïve patients, but two amino acids that are secondary resistance mutations to INSTIs in HIV-1 were observed. The 10 raltegravir-experienced patients exhibited resistance mutations via three main genetic pathways: N155H, Q148R, and eventually E92Q - T97A. The 155 pathway was preferentially used (7/10 patients). Other mutations associated to raltegravir resistance in HIV-1 were also observed in our HIV-2 population (V151I and D232N), along with several novel mutations previously unreported. Data retrieved from this study should help build a more robust HIV-2-specific algorithm for the genotypic interpretation of raltegravir resistance, and contribute to improve the clinical monitoring of HIV-2-infected patients.