DSB诱导的氧化应激:揭示DNA损伤反应和细胞代谢之间的交叉声
Xinyu Li1, Caini Yang1, Hengyu Wu1
1College of Biotechnology, Tianjin University of Science and Technology, Tianjin, China.
DNA repair
|July 17, 2024
概括
DNA修复过程,特别是同源重组 (HR) 和非同源末端连接 (NHEJ),可以引发氧化应激. 阻断这些DNA修复通路会抑制活性氧物种 (ROS) 的产生.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
背景情况:
- 众所周知,反应性氧物种 (ROS) 会导致DNA损伤.
- 相反的效应,即DNA损伤和修复是否诱导氧化应激,是不太了解的.
研究的目的:
- 调查DNA修复机制是否可以诱导氧化应激.
- 为了确定参与此过程的特定DNA修复途径.
主要方法:
- 使用Saccharomyces cerevisiae中的I-SceI内核酶生成特定位置的DNA双链断裂 (DSB).
- 删除涉及同源重组 (HR) 和非同源末端连接 (NHEJ) 途径的关键基因.
- 测量活性氧物种 (ROS) 含量和抗氧化酶活性.
主要成果:
- 已经证明,包括HR和NHEJ在内的DNA修复过程会引发氧化应激.
- 早期HR切除基因 (例如MRX复合体) 的破坏刺激了ROS,而下游删除则抑制了它.
- 阻断NHEJ也抑制了ROS,这表明这两种途径都会导致氧化应激,NHEJ更为突出.
- 确定Rad53是DNA损伤的关键媒介,以HR特定的方式向氧化还原代谢发出信号.
- DSB诱导的ROS与增加的NADPH氧化酶 (Yno1) 和抗氧化酶活性相关.
- 在DSB诱导时,SOD1的删除导致了HR缺陷突变体的合成致命性.
结论:
- DNA修复通路 (HR和NHEJ) 显著影响细胞代谢,并诱导氧化应激.
- 与HR相比,NHEJ在ROS刺激中似乎发挥了更重要的作用.
- 这些发现突出了DNA修复和氧化还原代谢之间的相互作用,对基因毒性疗法和癌症治疗有影响.
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