Abstract
Recently, the Food and Drug Administration (FDA) of the USA approved the first integrase inhibitor for inclusion in treatment regimens of HIV-1 patients failing their current regimens with multi-drug resistant strains. However, treatment failure has been observed during integrase inhibitor-containing therapy. Several mutational pathways have been described with signature mutations at integrase positions 66, 92, 148 and 155. Therefore, a genotypic assay for the amplification and sequencing of HIV-1 integrase was developed. The assay displayed a detection limit of 10 HIV-1 III(B) RNA copies/ml plasma. As the HIV-1 pandemic is characterised by a large genetic diversity, the new assay was evaluated on a panel of 74 genetically divergent samples belonging to the following genetic forms A, B, C, D, F, G, J, CRF01-AE, CRF02-AG, CRFF03-AB, CRF12-BF and CRF13-cpx. Their viral load ranged from 178 until >500,000 RNA copies/ml. The amplification and sequencing was successful for 70 samples (a success rate of 95%). The four failures were most probably due to low viral load or poor quality of RNA and not to subtype issues. Some of the sequences obtained from integrase inhibitor-naïve patients displayed polymorphisms at integrase positions a...Continue Reading
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