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M9490410.TXT
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1994-09-19
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Document 0410
DOCN M9490410
TI Differential growth kinetics are exhibited by human immunodeficiency
virus type 1 TAR mutants.
DT 9411
AU Harrich D; Hsu C; Race E; Gaynor RB; Department of Internal Medicine,
University of Texas Southwestern; Medical Center, Dallas 75235-8594.
SO J Virol. 1994 Sep;68(9):5899-910. Unique Identifier : AIDSLINE
MED/94335107
AB The human immunodeficiency virus type 1 (HIV-1) TAR element is critical
for the activation of gene expression by the transactivator protein,
Tat. Mutagenesis has demonstrated that a stable stem-loop RNA structure
containing both loop and bulge structures transcribed from TAR is the
major target for tat activation. Though transient assays have defined
elements critical for TAR function, no studies have yet determined the
role of TAR in viral replication because of the inability to generate
viral stocks containing mutations in TAR. In the current study, we
developed a strategy which enabled us to generate stable 293 cell lines
which were capable of producing high titers of different viruses
containing TAR mutations. Viruses generated from these cell lines were
used to infect both T-lymphocyte cell lines and peripheral blood
mononuclear cells. Viruses containing TAR mutations in either the upper
stem, the bulge, or the loop exhibited dramatically decreased HIV-1 gene
expression and replication in all cell lines tested. However, we were
able to isolate lymphoid cell lines which stably expressed gene products
from each of these TAR mutant viruses. Though the amounts of virus in
these cell lines were roughly equivalent, cells containing TAR mutant
viruses were extremely defective for gene expression compared with cell
lines containing wild-type virus. The magnitude of this decrease in
viral gene expression was much greater than previously seen in transient
expression assays using HIV-1 long terminal repeat chloramphenicol
acetyltransferase gene constructs. In contrast to the defects in viral
growth found in T-lymphocyte cell lines, several of the viruses
containing TAR mutations were much less defective for gene expression
and replication in activated peripheral blood mononuclear cells. These
results indicate that maintenance of the TAR element is critical for
viral gene expression and replication in all cell lines tested, though
the cell type which is infected is also a major determinant of the
replication properties of TAR mutant viruses.
DE Base Sequence Cell Line *Gene Expression Regulation, Viral Human HIV
Long Terminal Repeat/*GENETICS HIV-1/*GROWTH & DEVELOPMENT In Vitro
Molecular Sequence Data Nucleic Acid Conformation
Oligodeoxyribonucleotides/CHEMISTRY Structure-Activity Relationship
Support, Non-U.S. Gov't Support, U.S. Gov't, Non-P.H.S. Support, U.S.
Gov't, P.H.S. T-Lymphocytes/MICROBIOLOGY Transcription, Genetic
*Virus Replication JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).