Léveillé, N;
Elkon, R;
Davalos, V;
Manoharan, V;
Hollingworth, D;
Oude Vrielink, J;
le Sage, C;
... Agami, R; + view all
(2011)
Selective inhibition of microRNA accessibility by RBM38 is required for p53 activity.
Nature Communications
, 2
, Article 513. 10.1038/ncomms1519.
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Abstract
MicroRNAs (miRNAs) interact with 3'-untranslated regions of messenger RNAs to restrict expression of most protein-coding genes during normal development and cancer. RNA-binding proteins (RBPs) can control the biogenesis, stability and activity of miRNAs. Here we identify RBM38 in a genetic screen for RBPs whose expression controls miRNA access to target mRNAs. RBM38 is induced by p53 and its ability to modulate miRNA-mediated repression is required for proper p53 function. In contrast, RBM38 shows lower propensity to block the action of the p53-controlled miR-34a on SIRT1. Target selectivity is determined by the interaction of RBM38 with uridine-rich regions near miRNA target sequences. Furthermore, in large cohorts of human breast cancer, reduced RBM38 expression by promoter hypermethylation correlates with wild-type p53 status. Thus, our results indicate a novel layer of p53 gene regulation, which is required for its tumour suppressive function.
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