Abstract
Mediator of DNA-damage checkpoint 1 (MDMDC1) has a central role in repair of DNA double-strand breaks (DSBs) by both homologous recombination and nonhomologous end joining, and its function is regulated by post-translational phosphorylation, ubiquitylation and sumoylation. In this issue, a new study by Watanabe et al. reveals that methylation of MDMDC1 is also critical for its function in DSB repair and specifically affects repair through BRCA1-dependent homologous recombination.
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