Abstract
Genome-wide chromatin studies identified the tumor suppressor p53 as both a promoter and an enhancer-binding transcription factor. As an enhancer factor, p53 can induce local production of enhancer RNAs, as well as transcriptional activation of distal neighboring genes. Beyond the regulation of protein-coding genes, p53 has the capacity to regulate long intergenic noncoding RNA molecules (lincRNAs); however, their importance to the p53 tumor suppressive function remains poorly characterized. Here, we identified and characterized a novel p53-bound intronic enhancer that controls the expression of its host, the lincRNA00475 (linc-475). We demonstrate the requirement of linc-475 for the proper induction of a p53-dependent cell cycle inhibitory response. We further confirm the functional importance of linc-475 in the maintenance of CDKN1A/p21 levels, a cell cycle inhibitor and a major p53 target gene, following p53 activation. Interestingly, loss of linc-475 reduced the binding of both p53 and RNA polymerase II (RNAPII) to the promoter of p21, attenuating its transcription rate following p53 activation. Altogether, our data suggest a direct role of p53-bound enhancer domains in the activation of lincRNAs required for an efficient p53 transcriptional response.
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Melo, C., Léveillé, N., Rooijers, K. et al. A p53-bound enhancer region controls a long intergenic noncoding RNA required for p53 stress response. Oncogene 35, 4399–4406 (2016). https://doi.org/10.1038/onc.2015.502
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DOI: https://doi.org/10.1038/onc.2015.502
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