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M9490363.TXT
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1994-09-19
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Document 0363
DOCN M9490363
TI Differential expression of mRNAs for JC virus large and small tumor
antigens in brain tissues from progressive multifocal
leukoencephalopathy patients with and without AIDS.
DT 9411
AU Ishaq M; Stoner GL; Laboratory of Experimental Neuropathology, National
Institute of; Neurological Disorders and Stroke, National Institutes of
Health,; Bethesda, MD 20892.
SO Proc Natl Acad Sci U S A. 1994 Aug 16;91(17):8283-7. Unique Identifier :
AIDSLINE MED/94336730
AB JC virus (JCV) causes progressive multifocal leukoencephalopathy (PML),
the fatal demyelinating infection of oligodendrocytes, in up to 5% of
AIDS patients. An intron-differential RNA PCR was developed to study the
expression of alternately spliced JCV early mRNAs in brain tissues from
PML patients with and without AIDS and in JCV-induced hamster brain
tumors. The method utilizes primers that span the large tumor (T) and
small tumor (t) antigen introns allowing amplification of specific cDNAs
in the presence of contaminating viral genomic DNA. Hybridization with
specific junctional probes and DNA sequence analysis confirmed the
identity of the PCR products. Sequencing showed that JCV early mRNA is
alternatively spliced as previously predicted by analogy to simian virus
40. Large T antigen mRNA was detected in all the brain tissues from PML
patients with and without AIDS. The expression of small t antigen mRNA
varied depending upon the association of PML with AIDS and upon other
unknown factors. Of the 12 PML/AIDS brain tissue samples, 11 (92%)
expressed small t antigen mRNA, whereas only 8 of 13 (62%) brain samples
from patients with PML alone showed detectable levels of small t antigen
mRNA. Human immunodeficiency virus 1 proviral DNA was detected in 10 of
12 PML/AIDS brain samples. The results indicate that alternative
splicing of JCV early mRNA is regulated in the human brain and that the
production of small t antigen may not be essential for the pathogenesis
of PML.
DE Acquired Immunodeficiency Syndrome/*COMPLICATIONS Adult Antigens,
Viral/*BIOSYNTHESIS Base Sequence Brain/METABOLISM/*MICROBIOLOGY
Child Cloning, Molecular Comparative Study DNA Primers DNA,
Viral/*ISOLATION & PURIF Exons Female *Gene Expression Human
HIV-1/*ISOLATION & PURIF/METABOLISM Leukoencephalopathy, Progressive
Multifocal/COMPLICATIONS/ METABOLISM/*MICROBIOLOGY Male Middle Age
Molecular Sequence Data Polymerase Chain Reaction Polyomavirus hominis
2/GENETICS/ISOLATION & PURIF/*METABOLISM Proviruses/ISOLATION &
PURIF/METABOLISM RNA, Messenger/*BIOSYNTHESIS/ISOLATION & PURIF
Transcription, Genetic JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).