期刊
JOURNAL OF ANTIMICROBIAL CHEMOTHERAPY
卷 65, 期 12, 页码 2493-2501出版社
OXFORD UNIV PRESS
DOI: 10.1093/jac/dkq379
关键词
HIV co-receptors; phenotype; CCR5; tropism
资金
- Pfizer
- Spanish Health Ministry
- Instituto de Salud Carlos III
- AIDS Network ISCIII-RETIC [RD06/0006/0037, FIS PI05/00017, PI 080752]
- FIPSE Foundation [36630/07]
- EU [LSHP CT-2006-037611]
- Agence Nationale de la Recherche sur le SIDA (ANRS), France
- Spanish Ministry of Education and Science [SAF00/0028]
To develop a sensitive phenotypic assay based on recombinant viruses (RVs) for characterizing HIV-1 tropism. Viral tropism was assessed in 159 plasma samples. The env gene was amplified and ligated into pNL-lacZ/env-Ren, which carries a luciferase reporter gene. Resulting constructs were transfected into HEK293T cells to generate RVs. To assess co-receptor tropism, U87.CD4.CXCR4/CCR5 cells were infected and luciferase activity was measured. RVs containing env from different HIV-1 subtypes were replication competent. Minor variants were detectable in 1% of the viral population. Tropism was determined in 65% of samples with a viral load of < 1000 copies/mL. The phenotypic assay described here was validated with the Trofile (TM) and Trofile (TM) ES assays. Considering the Trofile (TM) assay as a reference, the sensitivity for R5 and R5X4/X4 detection was 90% and 77%, and the specificity was 77% and 90%, respectively. Our assay was 86% concordant with Trofile (TM) (90% for R5 and 77% for R5X4/X4). When our system was compared with Trofile (TM) ES, the concordance was 89% (86% for R5 and 92% for R5X4/X4), the sensitivity for R5 was 86% and for R5X4/X4 was 92%, and the specificity for R5 was 92% and for R5X4/X4 was 86%. The phenotypic results were compared with those obtained using the following V3 genotypic prediction tools: position-specific scoring matrix; geno2pheno[coreceptor]; C4.5; C4.5 using positions 8 and 12; PART; support vector machines; and the charge rule. We describe a system to assess co-receptor tropism based on the generation of chimeric replication-competent viruses with high sensitivity in the detection of minor populations. A good correlation of our results with Trofile (TM) assays was found.
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