Low frequency of CXCR4-using viruses in patients at the time of primary non-subtype-B HIV-1 infection.

Abstract:

:We used genotypic and phenotypic assays to estimate the frequency of X4/DM viruses in 131 patients infected with non-subtype-B viruses at the time of primary HIV-1 infection (PHI). All patients were enrolled in the French PRIMO Cohort from 1996 to 2007. Most strains belonged to CRF02_AG (51.1%) and subtype A (14.5%). Sixteen viruses (12.2%) were classified as CXCR4 tropic ("X4 strains") by the combined criteria of amino acids 11 and 25 of the V3 loop (11/25) and net charge rules and/or the SVMgeno2pheno(10%) algorithm: 6 strains by the combined genotypic rule, 7 by the SVMgeno2pheno(10%) algorithm, and 3, clustering in subtype D, by both algorithms. However, only one strain (0.8%), belonging to subtype A, was defined as a dual-tropic (DM) virus by the phenotypic assay. The 67 CRF02_AG strains included 2 classified as X4 strains by the combined genotypic rule (3%) and 2 others classified as X4 strains by SVMgeno2pheno(10%) (3%), but none of these 4 strains was an X4 or DM strain according to the phenotypic assay. These results suggest that the cellular virus reservoir was established with X4 strains in very few non-subtype-B-infected patients at the time of PHI. Genotypic predictions can overestimate the proportion of non-subtype-B X4 viruses at PHI.

journal_name

J Clin Microbiol

authors

Frange P,Chaix ML,Raymond S,Galimand J,Deveau C,Meyer L,Goujard C,Rouzioux C,Izopet J,French ANRS CO 06 PRIMO Cohort Study Group.

doi

10.1128/JCM.00704-10

subject

Has Abstract

pub_date

2010-10-01 00:00:00

pages

3487-91

issue

10

eissn

0095-1137

issn

1098-660X

pii

JCM.00704-10

journal_volume

48

pub_type

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