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- W2551034114 abstract "Mdm2 is the key negative regulator of the tumour suppressor p53, making it an attractive target for anti-cancer drug design. We recently identified a new role of Mdm2 in gene repression through its direct interaction with several proteins of the polycomb group (PcG) family. PcG proteins form polycomb repressive complexes PRC1 and PRC2. PRC2 (via EZH2) mediates histone 3 lysine 27 (H3K27) trimethylation, and PRC1 (via RING1B) mediates histone 2A lysine 119 (H2AK119) monoubiquitination. Both PRCs mostly support a compact and transcriptionally silent chromatin structure. We found that Mdm2 regulates a gene expression profile similar to that of PRC2 independent of p53. Moreover, Mdm2 promotes the stemness of murine induced pluripotent stem cells and human mesenchymal stem cells, and supports the survival of tumour cells. Mdm2 is recruited to target gene promoters by the PRC2 member and histone methyltransferase EZH2, and enhances PRC-dependent repressive chromatin modifications, specifically H3K27me3 and H2AK119ub1. Mdm2 also cooperates in gene repression with the PRC1 protein RING1B, a H2AK119 ubiquitin ligase. Here we discuss the possible implications of these p53-independent functions of Mdm2 in chromatin dynamics and in the stem cell phenotype. We propose that the p53-independent functions of Mdm2 should be taken into account for cancer drug design. So far, the majority of clinically tested Mdm2 inhibitors target its binding to p53 but do not affect the new functions of Mdm2 described here. However, when targeting the E3 ligase activity of Mdm2, a broader spectrum of its oncogenic activities might become druggable." @default.
- W2551034114 created "2016-11-30" @default.
- W2551034114 creator A5004540529 @default.
- W2551034114 creator A5010176516 @default.
- W2551034114 creator A5027496703 @default.
- W2551034114 date "2016-12-07" @default.
- W2551034114 modified "2023-10-11" @default.
- W2551034114 title "Mdm2 as a chromatin modifier" @default.
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- W2551034114 doi "https://doi.org/10.1093/jmcb/mjw046" @default.
- W2551034114 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5439376" @default.
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- W2551034114 hasPublicationYear "2016" @default.
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