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Pubmed ID :22325991
Publication Date : //

Nuclear matrix factor hnRNP U/SAF-A exerts a global control of alternative splicing by regulating U2 snRNP maturation.


The nuclear matrix-associated hnRNP U/SAF-A protein has been implicated in diverse pathways from transcriptional regulation to telomere length control to X inactivation, but the precise mechanism underlying each of these processes has remained elusive. Here, we report hnRNP U as a regulator of SMN2 splicing from a custom RNAi screen. Genome-wide analysis by CLIP-seq reveals that hnRNP U binds virtually to all classes of regulatory noncoding RNAs, including all snRNAs required for splicing of both major and minor classes of introns, leading to the discovery that hnRNP U regulates U2 snRNP maturation and Cajal body morphology in the nucleus. Global analysis of hnRNP U-dependent splicing by RNA-seq coupled with bioinformatic analysis of associated splicing signals suggests a general rule for splice site selection through modulating the core splicing machinery. These findings exemplify hnRNP U/SAF-A as a potent regulator of nuclear ribonucleoprotein particles in diverse gene expression pathways.

Authors : Xiao Rui , Tang Peng , Yang Bo , Huang Jie , Zhou Yu , Shao Changwei , Li Hairi , Sun Hui , Zhang Yi , Fu Xiang-Dong ,

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