Serine/arginine-rich protein-dependent suppression of exon skipping by exonic splicing enhancers

AUTOR(ES)

Ibrahim, El Chérif

FONTE

National Academy of Sciences

RESUMO

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.

Documentos Relacionados

• Identification and Characterization of a Novel Serine-Arginine-Rich Splicing Regulatory Protein
• The plant U1 small nuclear ribonucleoprotein particle 70K protein interacts with two novel serine/arginine-rich proteins.
• A serine/arginine-rich nuclear matrix cyclophilin interacts with the C-terminal domain of RNA polymerase II.
• Akt2 Regulation of Cdc2-Like Kinases (Clk/Sty), Serine/Arginine-Rich (SR) Protein Phosphorylation, and Insulin-Induced Alternative Splicing of PKCβII Messenger Ribonucleic Acid
• Identification of a plant serine-arginine-rich protein similar to the mammalian splicing factor SF2/ASF.