| First Author | López de Silanes I | Year | 2005 |
| Journal | Mol Cell Biol | Volume | 25 |
| Issue | 21 | Pages | 9520-31 |
| PubMed ID | 16227602 | Mgi Jnum | J:314555 |
| Mgi Id | MGI:6827200 | Doi | 10.1128/MCB.25.21.9520-9531.2005 |
| Citation | Lopez de Silanes I, et al. (2005) Identification and functional outcome of mRNAs associated with RNA-binding protein TIA-1. Mol Cell Biol 25(21):9520-31 |
| abstractText | 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-alpha) 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-alpha and COX-2 mRNAs and in 3,019 additional UniGene transcripts (approximately 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. |
