TDP43 与MLH1和MSH6蛋白相互作用以一种可诱导DNA损伤的方式
Vincent E Provasek1,2, Manohar Kodavati1, Brandon Kim3
1Division of DNA Repair Research within the Center for Neuroregeneration, Department of Neurosurgery, Houston Methodist Research Institute, Houston, TX 77030, USA.
Research square
|June 3, 2024
概括
肌缩侧面硬化症 (ALS) 涉及DNA修复问题. 这项研究揭示了TAR-DNA结合蛋白43 (TDP43) 与ALS中DNA不匹配修复蛋白相互作用,这表明了新的治疗点.
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 是一个遗传学.
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,其特征是基因组损伤和DNA修复受损.
- TAR-DNA结合蛋白43 (TDP43) 与ALS病理学有关,其中包括细胞位移错位和聚合 (TDP43蛋白质病变).
- 众所周知,TDP43在RNA代谢中发挥作用,但也在DNA修复中发挥作用,包括DNA双链断裂 (DSB).
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.
- 评估这种相互作用在ALS患者样本中的相关性.
主要方法:
- 用差异化SH-SY5Y神经元培养来研究TDP43相互作用.
- 使用了近距离结合试验 (PLA) 和共免疫沉 (CoIP) 试验.
- 甲基甲硫酸盐 (MMS) 用于诱导DNA修复,并使用siRNA对抗TDP43来评估其必要性.
主要成果:
- 发现TDP43与MLH1和MSH6相互作用,这些关键的MMR蛋白质,以诱导DNA损伤的方式.
- 在甲基甲硫酸盐 (MMS) 治疗后,这种相互作用显著增加.
- 在TDP43水平降低的细胞中,TDP43-MLH1/MSH6相互作用通过siRNA被废除.
- 从ALS患者的脊髓样本中观察到显著增加的TDP43-MMR蛋白相互作用.
结论:
- TDP43直接与DNA不匹配修复蛋白MLH1和MSH6.6相互作用.
- 这种相互作用是由DNA损伤增强的,这表明它在DNA修复途径中发挥了作用.
- 这些发现突出了ALS病变发生过程中的新型TDP43-MMR相互作用,提供了潜在的治疗点.
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