The novel role of microtubule regulators in the DNA damage response

DNA损伤，特别是DNA双链断裂（DSB），对细胞存活具有不利影响， 基因组稳定性作为对DNA损伤的反应，细胞激活了几个进化上保守的 修复DNA损伤、停止细胞增殖或诱导细胞死亡的机制。这些监视 机制，统称为DNA损伤反应（DDR），构成了一个重要的病因 许多人类疾病的因素，尤其是癌症。此外，解除武装、复员和重返社会方案是实现这一目标的一个关键决定因素。 使用辐射和其他DNA损伤剂的癌症治疗的治疗结果。长期 我们实验室的目标是使用全面的方法来描绘新的DDR因素和机制。 实验工具，从而揭示癌症进展和治疗的新见解。在最近的一 为了系统地鉴定DSB“修复体”的新成分，我们鉴定了Kif 2C和几个 其他MT调节剂作为潜在的DSB相关蛋白。Kif 2C被迅速募集到DNA损伤位点 并在DSB修复中起重要作用。引人注目的是，Kif 2C介导DSB的空间运动， 控制DNA损伤诱导的染色质重塑。Kif 2C的这些功能在很大程度上依赖于 其MT解聚酶活性，并可能通过与其他MT调节剂的协调来实现。对 另一方面，DNA损伤调节Kif 2C磷酸化和MT稳定化。这些发现 提出了一种新的细胞器间串扰之间的MT组件和DDR机制，不同的 从传统的观点来看，MT仅作为细胞质结构发挥作用。这些发现 还揭示了DNA损伤剂与抗MT的临床组合的新机制见解 癌症治疗中的毒药在这个项目中，我们将进一步揭示Kif 2C 调节DSB的流动性;我们将揭示Kif 2C如何与染色质重塑和 其他MT调节剂来控制损伤染色质处的动态染色质压实;我们将 在功能上表征ATM介导的Kif 2C磷酸化，以及在MT稳定化后的调节。 DNA损伤。总之，该项目将有可能为复员方案提供范式转移补充， 和MT生物学，并提高我们对细胞如何协调各种细胞成分的理解 以及在DNA损伤后维持基因组稳定性和细胞内稳态的机制。

DNA damage, particularly DNA double strand break (DSB), has detrimental effects on cell survival and genomic stability. In response to DNA damage, the cell activates several evolutionarily-conserved mechanisms to repair DNA damage, halt cell proliferation, or induce cell death. These surveillance mechanisms, collectively defined as the DNA damage response (DDR), constitute an important etiological factor for many human diseases, especially cancer. Moreover, the DDR is a key determinant for the therapeutic outcome of cancer treatment using radiation and other DNA damaging agents. A long-term goal of our laboratory is to delineate new DDR factors and mechanisms using comprehensive experimental tools, and thereby, revealing new insights into cancer progression and treatment. In a recent effort to systematically identify new components of the DSB “repairosome”, we identified Kif2C and several other MT regulators as potential DSB-associated proteins. Kif2C is rapidly recruited to DNA damage sites and plays an essential role in DSB repair. Strikingly, Kif2C mediates the spatial movement of DSBs, and controls DNA damage-induced chromatin remodeling. These functions of Kif2C are largely dependent on its MT depolymerase activity, and are likely to be achieved via coordination with other MT regulators. On the other hand, DNA damage modulates Kif2C phosphorylation and MT stabilization. These findings suggest a novel inter-organelle crosstalk between MT components and the DDR machinery that differs from the conventional perception that MT functions exclusively as a cytoplasmic structure. These findings also reveal new mechanistic insights into the clinical combinations of DNA damaging agents with anti-MT poisons in cancer therapy. In this project, we will further reveal detailed mechanisms via which Kif2C modulates the mobility of DSBs; we will uncover how Kif2C acts in concert with chromatin remodelers and other MT regulators to govern the dynamic chromatin compaction at damage chromatin; we will functionally characterize ATM-mediated Kif2C phosphorylation, and regulation of MT stabilization after DNA damage. Together, the project will potentially provide paradigm shifting additions to both the DDR and MT biology, and improve our understanding of how the cell coordinates various cellular components and mechanisms to maintain genomic stability and cell homeostasis after DNA damage.