title: Attenuation of human immunodeficiency virus type 1 cytopathic effects by replacing a 424-bp region of envelope from a noncytopathic biological clone.
abstract: We analyzed the env genes of cytopathic and noncytopathic biological clones derived from two HIV-1-infected children with discordant clinical courses. Chimeric viruses were constructed by switching env regions from V2 through V3 of the biological clones with the corresponding region from the molecular clone NL4-3. These HIV-1 chimeric viruses exhibited similar replication kinetics as well as syncytium-inducing abilities. The chimeric virus containing the env region of noncytopathic biological clone, GC6 8-4, was noncytopathic in an in vitro cell-killing assay, while the chimeric virus containing the env region of cytopathic biological clone, HC4, was cytopathic in the in vitro cell-killing assay. These studies suggest the presence of a cytopathicity determinant that maps to the envelope sequences contained within the downstream region of V2 and within the V3 region (nucleotide position 6822 to nucleotide position 7250, based on NL4-3 sequence).
authors.affiliation: Department of Pediatrics and Program in Molecular Medicine, University of Massachusetts Medical School, Worcester 01605, USA.
authors.forename: S E
authors.initials: SE
authors.lastname: Forte
authors.forename: M
authors.initials: M
authors.lastname: Somasundaran
authors.forename: J L
authors.initials: JL
authors.lastname: Sullivan
mesh_terms: D000595:Amino Acid Sequence; D015496:CD4-Positive T-Lymphocytes / Q000821:virology; D002648:Child; D002675:Child, Preschool; D003001:Cloning, Molecular; D003588:Cytopathogenic Effect, Viral / Q000235:genetics*; D015497:HIV-1 / Q000254:growth & development / Q000472:pathogenicity*; D006801:Humans; D019169:Jurkat Cells; D007700:Kinetics; D008969:Molecular Sequence Data; D010641:Phenotype; D016133:Polymerase Chain Reaction; D019713:Receptors, CCR5 / Q000378:metabolism; D016415:Sequence Alignment; D014759:Viral Envelope Proteins / Q000235:genetics*; D014779:Virus Replication
chemical_list: D019713:Receptors, CCR5; D014759:Viral Envelope Proteins