home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Shareware Overload Trio 2
/
Shareware Overload Trio Volume 2 (Chestnut CD-ROM).ISO
/
dir26
/
med9410p.zip
/
M94A3284.TXT
< prev
next >
Wrap
Text File
|
1994-10-25
|
3KB
|
46 lines
Document 3284
DOCN M94A3284
TI A computer simulator generating nucleotide sequence variation of the
HIV-1 genome.
DT 9412
AU Doi H; Fujitsu Labs. Ltd., Chiba, Japan.
SO Int Conf AIDS. 1994 Aug 7-12;10(1):111 (abstract no. PA0063). Unique
Identifier : AIDSLINE ICA10/94369291
AB OBJECTIVE: To know the range of nucleotide sequence variation of the
HIV-1 genome, in particular, of the variable regions. It has been
assumed that in most cases HIV-1 infection is initiated by a single
infectious virion. However, no one knows the range of variation within a
patient after infection. I therefore made a computer simulator to
generate the sequence variation. SIMULATOR: The HIV-1 reverse
transcriptase (RT) might interact with 6 to 7 bp long stretch of RNA-DNA
hybrid or double stranded DNA at the polymerase site during DNA
synthesis (Jacobo-Molina, A. et al., Proc. Natl. Acad. Sci. USA, 1993,
90, 6320; Arnold, E. et al., Nature, 1992, 357, 85; Kohlstaedt, L.A. et
al., Science, 1992, 256, 1783). 6-mers of purine-pyrmidine content have
been shown to be important for evolution of HIV-1 (Doi, H., Proc. Natl.
Acad. Sci. USA, 1991, 88, 9282). Therefore, the error spectra of 6-mers,
in which the transition probability to other nucleotides at a site of
the 6-mer is a value between 0.1 to 1.0, were obtained from the
nucleotide sequences of the strains entire sequences of which are known.
They might reflect the error-proneness of the HIV-1 RT, because of the
strategic codon frame in env, gag and pol. In the simulator, they were
composed along the nucleotide sequence tested, and nucleotide
substitution for another one at each site of the tested sequence was
stochastically determined according to the composed transition
probability; and then various sequences were stochastically generated.
RESULTS, DISCUSSION AND CONCLUSIONS: The computer simulator showed
ranges of nucleotide sequence variation of V1-5 and other regions. A
variable region was found in vpu by simulation, but the region was
conservative in isolated viruses. This suggest that the simulator can
search a region where is highly variable during reverse transcription
but on which a strong selection pressure might act.
DE *Computer Simulation DNA, Viral/GENETICS/METABOLISM Genes, env Genes,
gag Genes, pol Genes, vpu *Genome, Viral Human HIV
Infections/MICROBIOLOGY HIV-1/ENZYMOLOGY/*GENETICS *Models, Genetic
Reverse Transcriptase/METABOLISM *Variation (Genetics) MEETING
ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).