Abstract
The Rb/E2F pathway is deregulated in virtually all human tumors. It is clear that, in addition to Rb itself, essential cofactors required for transcriptional repression and silencing of E2F target genes are mutated or lost in cancer. To identify novel cofactors required for Rb/E2F-mediated inhibition of cell proliferation, we performed a genome-wide short hairpin RNA screen. In addition to several known Rb cofactors, the screen identified components of the Mediator complex, a large multiprotein coactivator required for RNA polymerase II transcription. We show that the Mediator complex subunit MED13L is required for Rb/E2F control of cell growth, the complete repression of cell cycle target genes, and cell cycle inhibition.
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Acknowledgements
All aspects of the research were supported under the National Cancer Institute Integrative Cancer Biology Program via grant National Institutes of Health 5-U54-CA112952. SPA was supported by NIH F32CA113177. We thank Lazlo Jakoi for technical assistance and all the members of the Nevins lab for their critical feedback and suggestions. We are grateful to Bernard Mathey-Prevot and Jeffrey Chang for comments on the manuscript. We thank Kaye Culler for assistance in submitting the manuscript. We are grateful to T Kitamura for providing Plat-E and Plat-A retroviral packaging cells, J DeCaprio for providing the T98G-EcoR cells, and E Knudsen for providing the -608Cyclin A-Luc and PSM-Rb plasmids.
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Dr Nevins' work has been funded by the NIH. He has received compensation as a member of the scientific advisory board of Qiagen SA Biosciences. In addition, he reports ownership interest in Expression Analysis, Inc. Dr Angus declares no potential conflict of interest.
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Angus, S., Nevins, J. A role for Mediator complex subunit MED13L in Rb/E2F-induced growth arrest. Oncogene 31, 4709–4717 (2012). https://doi.org/10.1038/onc.2011.622
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DOI: https://doi.org/10.1038/onc.2011.622
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