home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
The Arsenal Files 6
/
The Arsenal Files 6 (Arsenal Computer).ISO
/
health
/
med9603.zip
/
M9630112.TXT
< prev
next >
Wrap
Text File
|
1996-02-27
|
3KB
|
41 lines
Document 0112
DOCN M9630112
TI Generation and role of defective proviruses in cytopathic feline
leukemia virus (FeLV-FAIDS) infections.
DT 9603
AU de Noronha CM; Reinhart TA; Mullins JI; Department of Cancer Biology,
Harvard School of Public Health,; Boston, Massachusetts 02115, USA.
SO J Virol. 1996 Jan;70(1):359-67. Unique Identifier : AIDSLINE
MED/96099451
AB Cytopathic feline leukemia virus (FeLV) infections of feline T-cell line
(FeT-cell) cultures led to the accumulation and maintenance of threefold
more proviruses with deletions within the polymerase gene (pol) than
minimally cytopathic FeLV infections. Over 60% of the viral DNA from
cytopathic infections bore deletions in pol. Characterization of DNA
sequences adjoining the deletions revealed that the junctions were most
often flanked by RNA splice donor and acceptor consensus motifs. A
thymidine-to-cytidine mutation introduced at the +2 position of one RNA
splice donor-like motif inhibited formation of the two most prevalent
viral DNA species with deletions, confirming the origin of many
proviruses with deletions from reverse transcription of aberrantly
spliced viral RNA species. An example of deletion by misalignment was
also characterized. Viral inocula obtained from cells recovered after
cytopathic infections were attenuated in their ability to cause
cytopathic effects (CPE) and were able to confer superinfection
resistance to naive FeT-cells, despite maintaining envelope gene (env)
sequences with full cytopathic potential. This suggested that viral
genomes with deletions, rather than being required for cytopathicity,
play a role in protecting cells from CPE. Indeed, expression of a
molecularly cloned provirus bearing one of the characterized deletions
attenuated CPE in FeT-cells caused by superinfecting cytopathic virus.
DE Animal Base Sequence Cats Cell Line Defective
Viruses/GENETICS/ISOLATION & PURIF/*PHYSIOLOGY DNA, Viral Genes, pol
Genes, Viral Leukemia Virus, Feline/GENETICS/ISOLATION &
PURIF/*PHYSIOLOGY Molecular Sequence Data Proviruses/ISOLATION &
PURIF/*PHYSIOLOGY Sequence Deletion Support, U.S. Gov't, P.H.S. Virus
Replication JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).