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M94A0631.TXT
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1994-10-21
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Document 0631
DOCN M94A0631
TI Mutually dependent, concurrent RNA and DNA synthesis during early phase
HIV replication.
DT 9412
AU Kok TW; Li P; Burrell CJ; Div. of Medical Virology, NCHVR, Institute of
Medical and; Veterinary Science, Adelaide, South Australia.
SO Annu Conf Australas Soc HIV Med. 1993 Oct 28-30;5:68 (abstract no. FB2).
Unique Identifier : AIDSLINE ASHM5/94349024
AB In a cell-to-cell HIV infection model it was found that there were two
distinct phases of induced HIV RNA synthesis. The first phase (4h - 12h
pi) was marked by a significant increase in only the genomic-length
viral RNA. The second, phase (24h onwards) comprised a dramatic increase
in the levels of all three species of viral RNA. The first phase, but
not the second phase of viral RNA induction, was abolished when
unintegrated viral DNA synthesis was inhibited by AZT. When virus donor
H3B cells were pre-treated with actinomycin D and mixed with untreated
recipient Hut78 cells; the second phase, but not the first phase, of
induced viral RNA transcription was abolished. Reverse transcription was
not affected by actinomycin D. Full length linear unintegrated viral DNA
was produced but viral integration was inhibited when donor and
recipient cells were arrested in the G1 phase of the cell cycle by
aphidicolin. Under these conditions, it was found that the second phase,
but not the first phase of induced viral RNA synthesis was abolished.
Taken together, these results suggest a mutually dependent concurrent
viral RNA/DNA synthesis early after cell-to-cell transmission of HIV
infection. The template for the first phase of viral RNA induction is
likely to be the linear unintegrated viral DNA and the second phase may
use newly integrated as well as proviral DNA in the donor cells as a
more effective transcription template.
DE DNA, Viral/*BIOSYNTHESIS/GENETICS Gene Expression Regulation,
Viral/PHYSIOLOGY Human HIV/*GENETICS HIV Infections/*MICROBIOLOGY
RNA, Viral/*BIOSYNTHESIS/GENETICS Transcription, Genetic/GENETICS
Virus Integration/*GENETICS Virus Replication/*GENETICS MEETING
ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).