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Stress-responsive maturation of Clk1/4 pre-mRNAs promotes phosphorylation of SR splicing factor.

J. Cell Biol.2011 Oct 3;195(1):27-40. Epub 2011 Sep 26
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摘要


It has been assumed that premessenger ribonucleic acids (RNAs; pre-mRNAs) are spliced cotranscriptionally in the process of gene expression. However, in this paper, we report that splicing of Clk1/4 mRNAs is suspended in tissues and cultured cells and that intermediate forms retaining specific introns are abundantly pooled in the nucleus. Administration of the Cdc2-like kinase-specific inhibitor TG003 increased the level of Clk1/4 mature mRNAs by promoting splicing of the intron-retaining RNAs. Under stress conditions, splicing of general pre-mRNAs was inhibited by dephosphorylation of SR splicing factors, but exposure to stresses, such as heat shock and osmotic stress, promoted the maturation of Clk1/4 mRNAs. Clk1/4 proteins translated after heat shock catalyzed rephosphorylation of SR proteins, especially SRSF4 and SRSF10. These findings suggest that Clk1/4 expression induced by stress-responsive splicing serves to maintain the phosphorylation state of SR proteins.

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