Novel recombinant virus assay for measuring susceptibility of human immunodeficiency virus type 1 group M subtypes to clinically approved drugs.

Abstract:

:Combination therapy can successfully suppress human immunodeficiency virus (HIV) replication in patients but selects for drug resistance, requiring subsequent resistance-guided therapeutic changes. This report describes the development and validation of a novel assay that offers a uniform method to measure susceptibility to all clinically approved HIV type 1 (HIV-1) drugs targeting reverse transcriptase (RT), protease (PR), integrase (IN), and viral entry. It is an assay in which the antiviral effect on infection within a single replication cycle is measured in triply transfected U87.CD4.CXCR4.CCR5 cells, based on homologous recombination between patient-derived amplicons and molecular proviral clones tagged with the enhanced green fluorescent protein (EGFP) reporter gene and from which certain viral genomic regions are removed. The deletions stretch from p17 codon 7 to PR codon 98 in pNL4.3-DeltagagPR-EGFP, from PR codons 1 to 99 in pNL4.3-DeltaPR-EGFP, from RT codons 1 to 560 in pNL4.3-DeltaRT-EGFP, from IN codons 1 to 288 in pNL4.3-DeltaIN-EGFP, and from gp120 codon 34 to gp41 codon 237 in pNL4.3-Deltaenv-EGFP. The optimized experimental conditions enable the investigation of patient samples regardless of viral subtype or coreceptor use. The extraction and amplification success rate for a set of clinical samples belonging to a broad range of HIV-1 group M genetic forms (A-J, CRF01-03, CRF05, and CRF12-13) and displaying a viral load range of 200 to >500,000 RNA copies/ml was 97%. The drug susceptibility measurements, based on discrimination between infected and noninfected cells on a single-cell level by flow cytometry, were reproducible, with coefficients of variation for resistance ranging from 7% to 31%, and were consistent with scientific literature in terms of magnitude and specificity.

journal_name

J Clin Microbiol

authors

Covens K,Dekeersmaeker N,Schrooten Y,Weber J,Schols D,Quiñones-Mateu ME,Vandamme AM,Van Laethem K

doi

10.1128/JCM.01739-08

subject

Has Abstract

pub_date

2009-07-01 00:00:00

pages

2232-42

issue

7

eissn

0095-1137

issn

1098-660X

pii

JCM.01739-08

journal_volume

47

pub_type

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