home *** CD-ROM | disk | FTP | other *** search
- 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).
-
-