Identification and functional outcome of mRNAs associated with RNA-binding protein TIA-1

Isabel López De Silanes, Stefanie Galbán, Jennifer L. Martindale, Xiaoling Yang, Krystyna Mazan-Mamczarz, Fred E. Indig, Geppino Falco, Ming Zhan, Myriam Gorospe

Research output: Contribution to journalArticle

177 Scopus citations

Abstract

The RNA-binding protein TIA-1 (T-cell intracellular antigen 1) functions as a posttranscriptional regulator of gene expression and aggregates to form stress granules following cellular damage. TIA-1 was previously shown to bind mRNAs encoding tumor necrosis factor alpha (TNF-α) and cyclooxygenase 2 (COX-2), but TIA-1 target mRNAs have not been systematically identified. Here, immunoprecipitation (IP) of TIA-1-RNA complexes, followed by microarray-based identification and computational analysis of bound transcripts, was used to elucidate a common motif present among TIA-1 target mRNAs. The predicted TIA-1 motif was a U-rich, 30- to 37-nucleotide (nt)-long bipartite element forming loops of variable size and a bent stem. The TIA-1 motif was found in the TNF-α and COX-2 mRNAs and in 3,019 additional UniGene transcripts (∼3% of the UniGene database), localizing preferentially to the 3′ untranslated region. The interactions between TIA-1 and target transcripts were validated by IP of endogenous mRNAs, followed by reverse transcription and PCR-mediated detection, and by pulldown of biotinylated RNAs, followed by Western blotting. Further studies using RNA interference revealed that TIA-1 repressed the translation of bound mRNAs. In summary, we report a signature motif present in mRNAs that associate with TIA-1 and provide support to the notion that TIA-1 represses the translation of target transcripts.

Original languageEnglish (US)
Pages (from-to)9520-9531
Number of pages12
JournalMolecular and Cellular Biology
Volume25
Issue number21
DOIs
StatePublished - Nov 2005

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

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