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在CAG重复扩张过程中,DNA挤出大小决定了路径选择

Mayuri Bhatia, Ashutosh S Phadte, Anna Lakhina

bioRxiv : the preprint server for biology

|June 4, 2025

概括

DNA三重重复扩张导致神经退行性疾病. DNA挤出的大小决定了FAN1核酶或MutSβ途径是否修复它们,控制重复稳定性或扩张.

科学领域:

分子生物学分子生物学
遗传学遗传学是一个
DNA 修复机制的修复机制

背景情况:

DNA三重重复扩张是一种关键的突变机制,是亨廷顿病等神经退行性疾病的基础.
据认为,DNA不匹配修复蛋白MutSβ通过识别针头结构来促进重复扩张.
通过分裂这些结构,FAN1核酶起到抑制重复扩张的作用.

研究的目的:

研究DNA挤出大小在确定FAN1和MutSβ之间的途径选择中的作用.
阐明FAN1和MutSβ在DNA三重重复稳定性中的对立作用的分子基础.

主要方法:

对FAN1和MutSβ处理不同大小的DNA挤出物的比较分析.
在体外测试以评估核酶活性和蛋白质-DNA相互作用.
基因研究以证实挤出尺寸依赖性路径选择的体内相关性.

主要成果:

两种FAN1和MutSβ路径都包含2-3个三重重复的过程挤出.
单个三重挤出并未被FAN1切割,并且仅由MutSβ依赖的不匹配修复路径处理.
这种取决于大小的处理决定了DNA三重复是否扩大或保持稳定.

结论:

DNA挤出的大小是DNA修复路径选择的关键决定因素.
这种以大小为基础的机制控制了重复扩张和稳定性之间的平衡,影响了疾病的致病性.
这些发现为DNA结构动力学和DNA修复途径选择提供了新的见解.

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