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1996-02-27
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Document 0533
DOCN M9630533
TI Convergent evolution within the V3 loop domain of human immunodeficiency
virus type 1 in association with disease progression.
DT 9603
AU Strunnikova N; Ray SC; Livingston RA; Rubalcaba E; Viscidi RP;
Department of Pediatrics, Johns Hopkins University School of; Medicine,
Baltimore, Maryland 21287, USA.
SO J Virol. 1995 Dec;69(12):7548-58. Unique Identifier : AIDSLINE +
AB Phylogenetic analysis was used to study in vivo genetic variation of the
V3 region of human immunodeficiency virus type 1 in relation to disease
progression in six infants with vertically acquired human
immunodeficiency virus type 1 infection. Nucleotide sequences from each
infant formed a monophyletic group with similar average branch lengths
separating the sets of sequences. In contrast to the star-shaped
phylogeny characteristic of interinfant viral evolution, the shape of
the phylogeny formed by sequences from the infants who developed AIDS
tended to be linear. A computer program, DISTRATE, was written to
analyze changes in DNA distance values over time. For the six infants,
the rate of divergence from the initial variant was inversely correlated
with CD4 cell counts averaged over the first 11 to 15 months of life (r
= -0.87, P = 0.024). To uncover evolutionary relationships that might be
dictated by protein structure and function, tree-building methods were
applied to inferred amino acid sequences. Trees constructed from the
full-length protein fragment (92 amino acids) showed that viruses from
each infant formed a monophyletic group. Unexpectedly, V3 loop protein
sequences (35 amino acids) that were found at later time points from the
two infants who developed AIDS clustered together. Furthermore, these
sequences uniquely shared amino acids that have been shown to confer a
T-cell line tropic phenotype. The evolutionary pattern suggests that
viruses from these infants with AIDS acquired similar and possibly more
virulent phenotypes.
DE Acquired Immunodeficiency Syndrome/IMMUNOLOGY/TRANSMISSION/ *VIROLOGY
Aging Amino Acid Sequence Base Sequence Comparative Study Consensus
Sequence Disease Transmission, Vertical *Evolution Female Follow-Up
Studies *Genes, env Human HIV
Infections/IMMUNOLOGY/TRANSMISSION/*VIROLOGY HIV-1/*GENETICS/ISOLATION
& PURIF/PATHOGENICITY Infant Infant, Newborn Molecular Sequence Data
Phylogeny Pregnancy Software Support, U.S. Gov't, P.H.S. Time
Factors Variation (Genetics) Viral Envelope
Proteins/BIOSYNTHESIS/CHEMISTRY/*GENETICS JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).