Stress alters the subcellular distribution of hSlu7 and thus modulates alternative splicing

Noam Shomron, Moti Alberstein, Mika Reznik, Gil Ast

Research output: Contribution to journalArticlepeer-review

Abstract

During pre-mRNA splicing, introns are removed and exons are ligated to form an mRNA. Exon choice is determined by different nuclear protein concentrations varying among tissues and cell types or by developmental stage. These can be altered by different cellular circumstances such as physiological stimuli, environmental effects and phosphorylation state. The splicing factor hSlu7 plays an important role in 3′ splice site selection during the second step of splicing in vitro and has been suggested to affect alternative splicing in vivo. Our results indicate that an ultraviolet-C (UV-C) stress stimulus triggers changes in the alternative splicing patterns of cellular genes by decreasing the nuclear concentration of hSlu7 through the modulation of its nucleus-to-cytoplasin transport. This shift is mostly dependent on the Jun N-terminal kinase (JNK) cascade. Although we found by RNAi knockdown that hSlu7 is not essential for cell viability, its nuclear concentration effects exon choice and inclusion:skipping ratio of alternative splicing. A possible spatial and temporal regulatory mechanism by which hSlu7 protein levels are regulated within the nucleus is suggested, thus implying a broad effect of hSlu7 on alternative splicing.

Original languageEnglish
Pages (from-to)1151-1159
Number of pages9
JournalJournal of Cell Science
Volume118
Issue number6
DOIs
StatePublished - 15 Mar 2005

Keywords

  • Alternative splicing
  • Cellular localization
  • Nuclear-cytoplasmic shift
  • Spliceosome
  • Stress
  • hSlu7
  • mRNA splicing
  • snRNP

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