Abstract
DNA replication stress is a major source of DNA strand breaks and genomic instability, and a hallmark of precancerous lesions. In these hyperproliferative tissues, activation of the DNA damage response results in apoptosis or senescence preventing or delaying their development to full malignancy. In cells, in which this antitumor barrier is disabled by mutations (for example, in p53), viability and further uncontrolled proliferation depend on factors that help to cope with replication-associated DNA damage. Replication problems preferentially arise in chromatin regions harboring complex DNA structures. DEK is a unique chromatin architectural factor which binds to non-B-form DNA structures, such as cruciform DNA or four-way junctions. It regulates DNA topology and chromatin organization, and is essential for the maintenance of heterochromatin integrity. Since its isolation as part of an oncogenic fusion in a subtype of AML, DEK has been consistently associated with tumor progression and chemoresistance. How DEK promotes cancer, however, is poorly understood. Here we show that DEK facilitates cellular proliferation under conditions of DNA replication stress by promoting replication fork progression. DEK also protects from the transmission of DNA damage to the daughter cell generation. We propose that DEK counteracts replication stress and ensures proliferative advantage by resolving problematic DNA and/or chromatin structures at the replication fork.
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Acknowledgements
We thank G Marra for U2-OS cells, Y Marquardt for NHD fibroblasts, J Schmidt for ImageJ Macro programming, D Hermann, K Weidele and F Teusel for technical assistance; S BĂĽrger and the FlowKon facility for support in flow cytometry and M Lopes, C Lukas, A BĂĽrkle and B LĂĽscher for fruitful discussions. This work was supported by the German Research Foundation (DFG) through funds of the SFB 969, and of the RTG 1331. Work in the laboratory of FK is supported by a DFG grant (KA 2799/1) and by the START program of the Faculty of Medicine, RWTH Aachen.
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Deutzmann, A., Ganz, M., Schönenberger, F. et al. The human oncoprotein and chromatin architectural factor DEK counteracts DNA replication stress. Oncogene 34, 4270–4277 (2015). https://doi.org/10.1038/onc.2014.346
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DOI: https://doi.org/10.1038/onc.2014.346
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