Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 102, Issue 14, Pages 5002-5007Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0500543102
Keywords
intronic splicing silencers; pre-mRNA splicing; accurate splice-site recognition and pairing
Categories
Funding
- NIGMS NIH HHS [R01 GM062287, R01 GM042231, GM62287, R56 GM043375, R01 GM043375, GM42231, GM43375] Funding Source: Medline
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The 5' and 3' splice sites within an intron can, in principle, be joined to those within any other intron during pre-mRNA splicing. However, exons are joined in a strict 5' to 3' linear order in constitutively spliced pre-mRNAs. Thus, specific mechanisms must exist to prevent the random joining of exons. Here we report that insertion of exon sequences into an intron can inhibit splicing to the downstream 3' splice site and that this inhibition is independent of intron size. The exon sequences required for splicing inhibition were found to be exonic enhancer elements, and their inhibitory activity requires the binding of serine/arginine-rich splicing factors. We conclude that exonic enhancers can act as barriers to prevent exon skipping and thereby may play a key role in ensuring the correct 5' to 3' linear order of exons in spliced mRNA.
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