title: Evolution of sequence divergence among human immunodeficiency virus type 1 isolates derived from a blood donor and a recipient.
abstract: Four neonates who were infected with a single unit of blood from a human immunodeficiency virus-1 (HIV-1)-infected adult (patient 1) were studied. Two of the infected children (patients II and III) developed symptomatic HIV-1 disease and died within the first 3 y of life. One child (patient IV) died at 8 mo of age of clinical problems that may have been HIV-related. In contrast, one child (patient V) has remained asymptomatic for 7.5 y and has exhibited a very gradual decline in CD4+ cell number. A previous study had shown very limited sequence diversity of isolates from patients I, II, and III (McNearney T et al.: Proc Natl Acad Sci USA 87:1917-1921, 1990). The current study examined additional HIV-1 sequences encoding the principal neutralizing V3 loop of the surface envelope protein of isolates from patients I and V. Amplified sequences were obtained using the polymerase chain reaction from a cultured isolate and uncultured peripheral blood leukocytes, and nucleotide sequences were determined for 13 clones from patient I and 19 clones from patient V. Clones derived from the cultured isolate exhibited less predicted amino acid sequence diversity on average (0-5.2%) than did sequences from uncultured leukocytes (0-19.8% differences). All clones were more closely related to those from patients II and III (0-19.8% amino acid differences) than to other North American or European isolates (18.8-27.0% amino acid differences) or African isolates (41.0-48.0% amino acid differences). Substitutions occurred at sites predicted to modulate host cell tropism and proteolytic cleavage of the V3 loop.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Department of Medicine, Washington University School of Medicine, St. Louis, Missouri 63110.
authors.forename: T
authors.initials: T
authors.lastname: McNearney
authors.forename: Z
authors.initials: Z
authors.lastname: Hornickova
authors.forename: B
authors.initials: B
authors.lastname: Kloster
authors.forename: A
authors.initials: A
authors.lastname: Birdwell
authors.forename: G A
authors.initials: GA
authors.lastname: Storch
authors.forename: S H
authors.initials: SH
authors.lastname: Polmar
authors.forename: M
authors.initials: M
authors.lastname: Arens
authors.forename: L
authors.initials: L
authors.lastname: Ratner
mesh_terms: D000328:Adult; D000595:Amino Acid Sequence; D005075:Biological Evolution; D001782:Blood Donors; D002648:Child; D003001:Cloning, Molecular; D005260:Female; D015699:HIV Envelope Protein gp120 / Q000235:genetics; D015658:HIV Infections / Q000382:microbiology* / Q000635:transmission*; D015497:HIV-1 / Q000235:genetics* / Q000302:isolation & purification; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction; D017386:Sequence Homology, Amino Acid; D013997:Time Factors
chemical_list: D015699:HIV Envelope Protein gp120