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Sci. Signal., 23 April 2013
Vol. 6, Issue 272, p. rs9
[DOI: 10.1126/scisignal.2003664]


Comparative Phosphoproteomic Analysis of Checkpoint Recovery Identifies New Regulators of the DNA Damage Response

Vincentius A. Halim1,2,3*, Mónica Alvarez-Fernández1,4*, Yan Juan Xu5, Melinda Aprelia5, Henk W. P. van den Toorn2,3, Albert J. R. Heck2,3, Shabaz Mohammed2,3, and René H. Medema1,5{dagger}

1 Department of Medical Oncology and Cancer Genomics Center, University Medical Center Utrecht, 3584 CG Utrecht, Netherlands.
2 Biomolecular Mass Spectrometry and Proteomics Group, Bijvoet Center for Biomolecular Research and Utrecht Institute for Pharmaceutical Sciences, Utrecht University, 3584 CH Utrecht, Netherlands.
3 Netherlands Proteomics Centre, 3584 CH Utrecht, Netherlands.
4 Cell Division and Cancer Group, Spanish National Cancer Research Center (CNIO), E-28029 Madrid, Spain.
5 Division of Cell Biology, Netherlands Cancer Institute, 1066 CX Amsterdam, Netherlands.

* These authors contributed equally to this work.

Abstract: How cells recover from a DNA damage–induced arrest is currently poorly understood. We performed large-scale quantitative phosphoproteomics to identify changes in protein phosphorylation that occurred during recovery from arrest in the G2 phase of the cell cycle caused by DNA damage. We identified 154 proteins that were differentially phosphorylated, and systematic depletion of each of these differentially phosphorylated proteins by small interfering RNA (siRNA) identified at least 10 potential regulators of recovery. Astrin, a protein associated with the mitotic spindle, was among the potential regulators of recovery. We found that astrin controlled the abundance of the cell cycle regulator p53 during DNA damage–induced arrest. Cells in which astrin was depleted had decreased murine double minute 2 (MDM2) abundance and increased p53 at the later stages of the DNA damage response. Astrin was required for continued expression of genes encoding proteins that promote cell cycle progression in arrested cells. Thus, by controlling p53 abundance in cells recovering from DNA damage, astrin maintains the cells in a state competent to resume the cell cycle.

{dagger} Corresponding author. E-mail: r.medema{at}

Citation: V. A. Halim, M. Alvarez-Fernández, Y. J. Xu, M. Aprelia, H. W. P. van den Toorn, A. J. R. Heck, S. Mohammed, R. H. Medema, Comparative Phosphoproteomic Analysis of Checkpoint Recovery Identifies New Regulators of the DNA Damage Response. Sci. Signal. 6, rs9 (2013).

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