Nucleic Acids Research, Vol 26, Issue 24 5568-5572, Copyright © 1998 by Oxford University Press
GC Roberts, C Gooding, HY Mak, NJ Proudfoot and CW Smith
Production of mRNA in eukaryotic cells involves not only transcription but
also various processing reactions such as splicing. Recent experiments have
indicated that there are direct physical connections between components of
the transcription and processing machinery, supporting previous suggestions
that pre-mRNA splicing occurs co- transcriptionally. Here we have used a
novel functional approach to demonstrate co-transcriptional regulation of
alternative splicing. Exon 3 of the alpha-tropomyosin gene is specifically
repressed in smooth muscle cells. By delaying synthesis of an essential
downstream inhibitory element, we show that the decision to splice or
repress exon 3 occurs during a limited window of opportunity following
transcription, indicating that splice site selection proceeds rapidly after
transcription.
ARTICLES
Co-transcriptional commitment to alternative splice site selection
Department of Biochemistry, 80 Tennis Court Road, Old Addenbrookes Site, University of Cambridge, Cambridge CB2 1GA, UK.
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