Title: Resistance to raltegravir highlights integrase mutations at codon 148 in conferring cross-resistance to a second-generation HIV-1 integrase inhibitor
Authors: Goethals, Olivia ×
Van Ginderen, Marcia
Vos, Ann
Cummings, Maxwell D
Van Der Borght, Koen
Van Wesenbeeck, Liesbeth
Feyaerts, Maxim
Verheyen, Ann
Smits, Veerle
Van Loock, Marnix
Hertogs, Kurt
Schols, Dominique
Clayton, Reginald F #
Issue Date: Jun-2011
Publisher: Elsevier/North-Holland
Series Title: Antiviral Research vol:91 issue:2 pages:167-176
Abstract: Raltegravir is the first integrase strand-transfer inhibitor (INSTI) approved for use in highly active antiretroviral therapy (HAART) for the management of HIV infection. Resistance to antiretrovirals can compromise the efficacy of HAART regimens. Therefore it is important to understand the emergence of resistance to RAL and cross-resistance to other INSTIs including potential second-generation INSTIs such as MK-2048. We have now studied the question of whether in vitro resistance selection (IVRS) with RAL initiated with viruses derived from clinical isolates would result in selection of resistance mutations consistent with those arising during treatment regimens with HAART containing RAL. Some correlation was observed between the primary mutations selected in vitro and during therapy, initiated with viruses with identical IN sequences. Additionally, phenotypic cross-resistance conferred by specific mutations to RAL and MK-2048 was quantified. N155H, a RAL-associated primary resistance mutation, was selected after IVRS with MK-2048, suggesting similar mechanisms of resistance to RAL and MK-2048. This was confirmed by phenotypic analysis of 766 clonal viruses harboring IN sequences isolated at the point of virological failure from 106 patients on HAART (including RAL), where mutation Q148H/K/R together with additional secondary mutations conferred reduced susceptibility to both RAL and MK-2048. A homology model of full length HIV-1 integrase complexed with viral DNA and RAL or MK-2048, based on an X-ray structure of the prototype foamy virus integrase-DNA complex, was used to explain resistance to RAL and cross-resistance to MK-2048. These findings will be important for the further discovery and profiling of next-generation INSTIs.
ISSN: 0166-3542
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Laboratory of Virology and Chemotherapy (Rega Institute)
× corresponding author
# (joint) last author

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