title: Evolution of human immunodeficiency virus type 1 envelope sequences in infected individuals with differing disease progression profiles.
abstract: Sequence variation displayed by the human immunodeficiency virus type 1 (HIV-1) has been proposed to be linked to the pathogenesis of acquired immunodeficiency syndrome (AIDS). To assess viral evolution during the course of infection, we evaluated sequence variability in the env variable domains in four HIV-1-infected individuals exhibiting differing profiles of CD4+ T cell decline when followed from seroconversion until the development of AIDS or loss of followup. Proviral sequences encoding the V3-V5 region of gp 120 were obtained following PCR amplification of peripheral blood mononuclear cell DNA and cloning. Virus in each patient was relatively homogeneous early in infection and then diverged with time, more consistently at its nonsynonymous sites. Just prior to or coincident with a rapid decline in CD4+ T cell numbers, sequences were found with basic amino acid substitutions clustered within and downstream of the gp 120 V3 domain. Within the constraints of the current data set, we conclude that the virus appears to continually accumulate changes in its amino acid sequences well into the time of marked CD4+ T cell decline.
authors.affiliation: Department of Pathology, University of Pittsburgh, Pennsylvania 15261, USA.
authors.forename: R
authors.initials: R
authors.lastname: Shankarappa
authors.forename: P
authors.initials: P
authors.lastname: Gupta
authors.forename: G H
authors.initials: GH
authors.lastname: Learn
authors.forename: A G
authors.initials: AG
authors.lastname: Rodrigo
authors.forename: C R
authors.initials: CR
authors.lastname: Rinaldo
authors.forename: M C
authors.initials: MC
authors.lastname: Gorry
authors.forename: J I
authors.initials: JI
authors.lastname: Mullins
authors.forename: P L
authors.initials: PL
authors.lastname: Nara
authors.forename: G D
authors.initials: GD
authors.lastname: Ehrlich
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D018791:CD4 Lymphocyte Count; D015331:Cohort Studies; D004279:DNA, Viral; D018450:Disease Progression; D005500:Follow-Up Studies; D014644:Genetic Variation; D015699:HIV Envelope Protein gp120 / Q000145:classification / Q000235:genetics*; D015658:HIV Infections / Q000276:immunology / Q000503:physiopathology / Q000821:virology*; D015497:HIV-1 / Q000145:classification / Q000235:genetics*; D006801:Humans; D008297:Male; D008969:Molecular Sequence Data; D016296:Mutagenesis; D010446:Peptide Fragments / Q000145:classification / Q000235:genetics; D010802:Phylogeny; D017386:Sequence Homology, Amino Acid; D013997:Time Factors
chemical_list: D004279:DNA, Viral; D015699:HIV Envelope Protein gp120; C059762:HIV envelope protein gp120 (305-321); D010446:Peptide Fragments