home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Collection of Education
/
collectionofeducationcarat1997.iso
/
HEALTH
/
MED9602.ZIP
/
M9620395.TXT
< prev
next >
Wrap
Text File
|
1996-02-26
|
3KB
|
45 lines
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).