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- Document 0395
- DOCN M9620395
- TI Intrahost human immunodeficiency virus type 1 evolution is related to
- length of the immunocompetent period.
- DT 9602
- AU Lukashov VV; Kuiken CL; Goudsmit J; Human Retrovirus Laboratory,
- University of Amsterdam, The; Netherlands.
- SO J Virol. 1995 Nov;69(11):6911-6. Unique Identifier : AIDSLINE
- MED/96013791
- AB The antigenic diversity threshold theory predicts that antigenic sites
- of human immunodeficiency virus type 1, such as the V3 region of the
- external glycoprotein gp120, evolve more rapidly during the symptom-free
- period in individuals progressing to AIDS than in those who remain
- asymptomatic for a long time. To test this hypothesis, genomic RNA
- sequences were obtained from the sera of 44 individuals at
- seroconversion and 5 years later. The mean number of nonsynonymous
- nucleotide substitutions in the V3 region of the viruses circulating in
- 31 nonprogressors (1.1 x 10(-2) +/- 0.1 x 10(-2) per site per year) was
- higher than the corresponding value for 13 progressors (0.66 x 10(-2)
- +/- 0.1 x 10(-2) per site per year) (P < 0.01), while no difference
- between the mean numbers of synonymous substitutions in the two groups
- was seen (0.37 x 10(-2) +/- 0.1 x 10(-2) and 0.51 x 10(-2) +/- 0.2 x
- 10(-2) per site per year for nonprogressors and progressors,
- respectively; P > 0.1). The mean ratios of synonymous nucleotide p
- distance to nonsynonymous p distance were 0.35 for nonprogressors and
- 0.62 for progressors. The number of nonsynonymous substitutions was not
- associated with virus load or virus phenotype, which are established
- predictors of disease progression, but correlated strongly with the
- duration of the immunocompetent period (r2 = 0.41; P = 0.001). This
- indicates that there is no causative relationship between intrahost
- evolution and CD4+ cell decline. Our data suggest that intrahost
- evolution in human immunodeficiency virus type 1 infection is driven by
- selective forces, the strength of which is related to the duration of
- the immunocompetent period.
- DE Acquired Immunodeficiency Syndrome/*IMMUNOLOGY *Antigenic Variation
- Cohort Studies Disease Progression *Evolution Homosexuality, Male
- Human HIV Envelope Protein gp120/*GENETICS HIV
- Seropositivity/*IMMUNOLOGY HIV-1/*GENETICS/IMMUNOLOGY
- *Immunocompetence Male Phenotype Phylogeny Prospective Studies
- Support, Non-U.S. Gov't Time Factors JOURNAL ARTICLE
-
- SOURCE: National Library of Medicine. NOTICE: This material may be
- protected by Copyright Law (Title 17, U.S.Code).
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-