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DNA Damage Response-Independent Role for MDC1 in Maintaining Genomic Stability. | LitMetric
MDC1 is a central player in checkpoint activation and subsequent DNA repair following DNA damage. Although MDC1 has been studied extensively, many of its known functions, to date, pertain to the DNA damage response (DDR) pathway. Herein we report a novel function of phosphorylated MDC1 that is independent of ATM and DNA damage and is required for proper mitotic progression and maintenance of genomic stability. We demonstrate that MDC1 is an target of Plk1 and that phosphorylated MDC1 is dynamically localized to nuclear envelopes, centrosomes, kinetochores, and midbodies. Knockdown of MDC1 or abrogation of Plk1 phosphorylation of MDC1 causes a delay of the prometaphase-metaphase transition. It is significant that mice with reduced levels of MDC1 showed an elevated level of spontaneous tumors in aged animals. Our results demonstrate that MDC1 also plays a fundamentally significant role in maintenance of genomic stability through a DDR-independent pathway.
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