这种XRCC1突变与PARP1过度活化和小脑动有关
Nicolas C Hoch1,2, Hana Hanzlikova1, Stuart L Rulten1
1Genome Damage and Stability Centre, School of Life Sciences, University of Sussex, Falmer, Brighton BN1 9RH, UK.
Nature
|December 22, 2016
概括
在DNA修复基因XRCC1的突变导致神经障碍, 抑制PARP1,一个参与DNA修复的酶,在小鼠中挽救了神经症状,表明PARP1是治疗点.
科学领域:
- 遗传学
- 神经科学
- 分子生物学
背景情况:
- XRCC1对于DNA单链断裂的修复至关重要.
- 在DNA修复中出现的缺陷会导致神经功能障碍.
- 在神经健康中XRCC1的作用尚未完全理解.
研究的目的:
- 研究XRCC1突变与神经疾病之间的联系.
- 阐明XRCC1相关的神经病理的分子机制.
- 确定DNA修复缺陷的神经疾病的潜在治疗点.
主要方法:
- 研究了双基XRCC1突变的患者.
- 在患者细胞中分析了DNA修复率和蛋白质ADP-ribosylation.
- 使用Xrcc1缺乏的小鼠模型.
- 在小鼠模型中研究了Parp1删除的影响.
主要成果:
- 双基XRCC1突变与眼部运动缺陷,轴突神经病变和小脑缺陷有关.
- 缺乏XRCC1的细胞显示DNA修复受损,蛋白质ADP- 核糖化升高.
- 在Xrcc1缺陷的小鼠中,Parp1的遗传删除使ADP- 核糖水平正常化,并减少神经元损失和动脉缩.
- 这表明多基酶 (PARP) 的过度活化有助于.
结论:
- 对于正常的神经功能来说,XRCC1蛋白质复合体是必不可少的.
- 由于DNA链断裂引起的PARP1活性升高有助于神经病理.
- 在与DNA链断裂修复缺陷相关的疾病中,PARP1是潜在的治疗点.
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