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TDP43与MLH1和MSH6蛋白相互作用,可诱导DNA损伤
Vincent E Provasek1,2, Manohar Kodavati3, Brandon Kim4
1Division of DNA Repair Research within the Center for Neuroregeneration, Department of Neurosurgery, Houston Methodist Research Institute, Houston, TX, 77030, USA. vprovasek@houstonmethodist.org.
Molecular brain
|June 5, 2024
概括
作为对DNA损伤的反应,TAR-DNA结合蛋白43 (TDP43) 与DNA不匹配修复蛋白MLH1和MSH6相互作用. 这种相互作用在肌缩侧面硬化症 (ALS) 患者中增加,这表明它在神经退行症中起作用.
科学领域:
- 神经科学是一个神经科学.
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
背景情况:
- 肌缩侧面硬化症 (ALS) 是一种致命的运动神经元疾病,其特点是基因组不稳定.
- TAR-DNA结合蛋白43 (TDP43) 与ALS病变发生有关,在受影响的神经元中观察到细胞结合物.
- 除了其已知的RNA代谢功能外,TDP43在DNA修复中发挥作用,包括DNA双链断裂 (DSB) 修复.
研究的目的:
- 为了研究TDP43和DNA不匹配修复 (MMR) 蛋白之间的相互作用.
- 为了确定这种相互作用是否可由DNA损伤诱导.
- 在ALS患者样本中评估TDP43-MMR相互作用的相关性.
主要方法:
- 利用差异化SH-SY5Y神经元培养.
- 使用近距离结合试验 (PLA) 和共免疫沉 (CoIP) 来检测蛋白质相互作用.
- 使用甲基甲硫酸盐 (MMS) 诱导的DNA不匹配修复和利用siRNA来耗尽TDP43.3.
主要成果:
- 发现TDP43与MLH1和MSH6相互作用,以诱导DNA损伤的方式.
- 在MMS治疗后,相互作用信号显著增加,表明增强了MMR途径的参与.
- 通过siRNA介导的TDP43的淘汰取消了这些相互作用.
- 与对照组相比,ALS患者的脊髓样本中TDP43-MLH1和TDP43-MSH6相互作用显著增加.
结论:
- TDP43与关键的DNA不匹配修复蛋白MLH1和MSH6.6直接相互作用.
- 这种相互作用是通过DNA损伤动态调节的,在ALS中是上调调节的.
- 这些发现突出了TDP43在与ALS神经病理相关的DNA修复途径中的新作用.
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