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1996-02-27
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Document 0628
DOCN M9630628
TI Two strong 5' splice sites and competing, suboptimal 3' splice sites
involved in alternative splicing of human immunodeficiency virus type 1
RNA.
DT 9603
AU O'Reilly MM; McNally MT; Beemon KL; Department of Biology, Johns Hopkins
University, Baltimore,; Maryland 21218, USA.
SO Virology. 1995 Nov 10;213(2):373-85. Unique Identifier : AIDSLINE
MED/96074513
AB The human immunodeficiency virus type 1 (HIV-1) genome contains 20 exons
that are alternatively spliced from 16 splice sites to generate more
than 40 different mRNAs, including incompletely spliced and unspliced
mRNAs. In contrast to avian retroviral RNA, which has a cis-acting
element in gag that negatively regulates splicing (NRS), HIV-1 RNA did
not have any NRS sequences in the gag or pol genes detectable by a
splicing inhibition assay. However, this assay demonstrated that the
HIV-1 first 5' splice site competed with a cellular 5' splice site,
suggesting that HIV-1 may have some strong splice sites. To extend this
observation, we used a splice site swapping strategy to determine the
efficiency of 14 HIV-1 splice sites in human beta globin chimeras tested
in transient transfection experiments. While the 1st HIV-1 5' splice
site used in all spliced transcripts and the 4th 5' splice site used in
most of the 2-kb transcripts were efficient, the other splice sites,
including all the 3' splice sites, were less efficient, ranging in use
from 25 to 60%. We propose that this range of splice site efficiencies
contributes to the regulation of alternative splicing of HIV-1 mRNAs.
DE *Alternative Splicing Base Sequence Binding Sites Cell Line,
Transformed Exons Genes, myc Genetic Engineering Genome, Viral
Globin/GENETICS Human HIV-1/*GENETICS Molecular Sequence Data RNA,
Messenger/*GENETICS/METABOLISM RNA, Viral/*GENETICS/METABOLISM
Support, U.S. Gov't, P.H.S. Transfection JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).