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M9620390.TXT
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1996-02-26
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Document 0390
DOCN M9620390
TI A transcript from the long terminal repeats of a murine retrovirus
associated with trans activation of cellular genes.
DT 9602
AU Choi SY; Faller DV; Cancer Research Center, Boston University School of
Medicine,; Massachusetts 02118, USA.
SO J Virol. 1995 Nov;69(11):7054-60. Unique Identifier : AIDSLINE
MED/96013808
AB Infection of human or murine cells with murine leukemia viruses rapidly
increases the expression of a number of genes that belong to the
immunoglobulin superfamily and are involved in T-lymphocyte activation,
including the class I major histocompatibility complex antigens. We have
reported recently that the long terminal repeat (LTR) of Moloney murine
leukemia virus encodes a trans activator which induces transcription and
expression of class I major histocompatibility complex genes and certain
cytokine genes. The portion of the LTR responsible for trans activation
was mapped by deletions to lie within the U3 region. We demonstrate here
that a transcript is initiated within the U3 region and that its
presence correlates with the trans-activating activity. Analysis of the
LTR region reveals a potential internal promoter element for RNA
polymerase III transcription within the U3 region. Studies with
polymerase inhibitors suggest that this LTR transcript, designated let
(LTR-encoded trans activator), is a product of RNA polymerase III. The
mechanisms whereby RNA leukemia viruses cause lymphoid neoplasia after a
long latent period have been extensively studied but are only partially
understood. The region of the LTR identified here as being important in
trans activation has recently been shown to be a critical determinant of
the leukemogenicity and latency of Moloney murine leukemia virus. These
findings suggest a novel mechanism of retrovirus-induced activation of
cellular gene expression, potentially contributing to leukemogenesis.
DE Animal Base Sequence Cell Line Cell Transformation, Neoplastic
Chloramphenicol Acetyltransferase/BIOSYNTHESIS Genes, Viral Human
Mice Mice, Inbred BALB C Molecular Sequence Data Moloney Leukemia
Virus/*GENETICS/PHYSIOLOGY Polymerase Chain Reaction Promoter Regions
(Genetics) Recombinant Proteins/BIOSYNTHESIS *Repetitive Sequences,
Nucleic Acid RNA Polymerase III/METABOLISM RNA,
Viral/BIOSYNTHESIS/ISOLATION & PURIF Sequence Deletion Support,
Non-U.S. Gov't Support, U.S. Gov't, P.H.S. *Trans-Activation
(Genetics) *Transcription, Genetic Transfection Tumor Cells, Cultured
Virus Latency 3T3 Cells JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).