title: Characterization of human immunodeficiency virus type 1 populations containing CXCR4-using variants from recently infected individuals.
abstract: We screened 150 individuals from two recent seroconverter cohorts and found that six (4%) had CXCR4-using viruses. Clonal analysis of these six individuals, along with a seventh individual identified during clinical care as a recent seroconverter, revealed the presence of both X4- and dual-tropic variants in these recently infected adults. The ability of individual CXCR4-using variants to infect cells expressing CD4/CXCR4 or CD4/CCR5 varied dramatically. These data demonstrate that virus populations in some newly infected individuals can consist of either heterogeneous populations containing both CXCR4-using and CCR5-tropic viruses, or homogeneous populations containing only CXCR4-using viruses. The presence of CXCR4-using viruses at early stages of infection suggests that testing for viral tropism before using CCR5 antagonists may be important even in persons with known recent infection. The presence of CXCR4-using viruses in a subset of newly infected individuals could impact the efficacies of vaccine and microbicide strategies that target CCR5-tropic viruses.
authors.affiliation: Monogram Biosciences, South San Francisco, California 94080, USA. whuang@monogrambio.com
authors.forename: Wei
authors.initials: W
authors.lastname: Huang
authors.forename: Jonathan
authors.initials: J
authors.lastname: Toma
authors.forename: Eric
authors.initials: E
authors.lastname: Stawiski
authors.forename: Signe
authors.initials: S
authors.lastname: Fransen
authors.forename: Terri
authors.initials: T
authors.lastname: Wrin
authors.forename: Neil
authors.initials: N
authors.lastname: Parkin
authors.forename: Jeannette M
authors.initials: JM
authors.lastname: Whitcomb
authors.forename: Eoin
authors.initials: E
authors.lastname: Coakley
authors.forename: Frederick M
authors.initials: FM
authors.lastname: Hecht
authors.forename: Steven G
authors.initials: SG
authors.lastname: Deeks
authors.forename: Rajesh T
authors.initials: RT
authors.lastname: Gandhi
authors.forename: Susan H
authors.initials: SH
authors.lastname: Eshleman
authors.forename: Christos J
authors.initials: CJ
authors.lastname: Petropoulos
mesh_terms: D000328:Adult; D000595:Amino Acid Sequence; D015496:CD4-Positive T-Lymphocytes / Q000378:metabolism; D015658:HIV Infections / Q000821:virology*; D015497:HIV-1 / Q000235:genetics / Q000378:metabolism*; D054884:Host-Pathogen Interactions; D006801:Humans; D008297:Male; D008969:Molecular Sequence Data; D010802:Phylogeny; D012367:RNA, Viral / Q000032:analysis / Q000235:genetics; D019713:Receptors, CCR5 / Q000378:metabolism; D019718:Receptors, CXCR4 / Q000378:metabolism*; D054299:env Gene Products, Human Immunodeficiency Virus / Q000235:genetics / Q000378:metabolism
chemical_list: C527276:CXCR4 protein, human; D012367:RNA, Viral; D019713:Receptors, CCR5; D019718:Receptors, CXCR4; D054299:env Gene Products, Human Immunodeficiency Virus
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