同类重组缺陷瘤依赖于Polθ介导的修复
Raphael Ceccaldi1, Jessica C Liu2, Ravindra Amunugama3
1Department of Radiation Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts 02215, USA.
Nature
|February 3, 2015
概括
在卵巢癌中,DNA修复途径Polθ与同源重组 (HR) 活性相反相关. 针对HR缺陷癌症中的Polθ提供了针对上皮卵巢癌 (EOC) 的新治疗策略.
科学领域:
- 基因组学就是基因组学.
- 癌症生物学 癌症生物学
- 修复DNA修复DNA的修复
背景情况:
- 一半的上皮卵巢癌 (EOC) 呈现同源重组 (HR) 基因变异,导致基因组不稳定.
- 患有HR缺陷的EOC严重依赖替代DNA修复途径,例如聚ADP核糖酶聚合酶 (PARP) 介导的修复.
- DNA聚合酶 θ (Polθ) 参与微同质介导端结合 (MMEJ),这是另一种DNA双链断裂修复途径.
研究的目的:
- 研究Polθ和正规DNA修复途径之间的相互作用,以防止EOC中的基因组不稳定性.
- 为了确定Polθ是否是卵巢癌的潜在治疗标.
主要方法:
- 分析HR活动与EOC中的Polθ表达之间的相关性.
- 在HR-熟练和HR-缺乏的EOC细胞系中试验性降低Polθ.
- 在小鼠模型中,HR基因和Polq的遗传失活.
- 研究Polθ与RAD51蛋白的相互作用.
主要成果:
- 在EOC中观察到HR活动和Polθ表达之间存在逆相关性.
- 在HR熟练的细胞中,Polθ敲击调节了HR活动和RAD51组装.
- 在HR缺乏的EOC中,Polθ敲击增强了细胞死亡.
- 结合HR和Polq的基因失活导致小鼠的胚胎死亡.
- 发现Polθ含有RAD51结合基因,并抑制RAD51介导的重组.
结论:
- 在EOC中,HR途径和Polθ介导的修复之间存在合成致命的关系.
- 波尔代表了卵巢癌治疗的新和可用药物的标.
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