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操纵替代的末端连接改变了Arabidopsis thaliana中碳离子束诱导的基因组突变配置文件

Jing Long^1,2, Jian Zhao¹, Jingmin Chen^1,2

¹Biophysics Group, Biomedical Center, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.

DNA research : an international journal for rapid publication of reports on genes and genomes

|May 31, 2025

概括

通过替代末端连接 (Alt-EJ) 来修复DNA双链断裂 (DSB) 是致变的. 这项研究揭示了Alt-EJJ.

科学领域:

植物分子生物学植物分子生物学
遗传学遗传学是一个
基因组学就是基因组学.

背景情况:

通过各种途径修复DNA双链断裂 (DSB),包括易发生错误的POLQ介导的替代末端连接 (Alt-EJ).
由于通过经典非同类末端结合 (C-NHEJ) 或同类重组的抑制,Alt-EJ对植物基因组不稳定性的确切影响尚不清楚.
了解DSB修复机制对于基因组稳定性和突变发生的策略至关重要.

研究的目的:

在有利于这种修复途径的条件下,研究Arabidopsis thaliana中Alt-EJ的突变效应.
阐明C-NHEJ和POLQ在复杂的DSBs引起的基因组不稳定性中介的不同作用.
探索DSB修复途径在开发新型突变发生系统方面的潜力.

主要方法:

利用碳离子束 (CIB) 辐射诱导复杂的DSB和偏差修复到Alt-EJ.
采用了缺乏C-NHEJ (lig4-4) 和POLQ (teb-3, teb-8) 的Arabidopsis thaliana突变物.
在野生型和突变系中分析了全基因组插入和删除 (InDel) 配置文件和DNA损伤反应 (DDR).

主要成果:

与野生类型相比,C-NHEJ缺陷线 (lig4-4) 对CIB和独特的InDel配置文件 (更大,更多,依赖微同质) 的敏感性更高.
缺乏POLQ的线条 (teb-8) 表现出构成性DDR和InDels中等变化,包括单基和复杂突变,但缺乏大型InDels (>30bp).
在LIG4和POLQ的功能丧失突变放大了CIB诱导的高影响基因组突变,即使在低剂量.

结论:

Alt-EJ显著导致植物基因组不稳定,特别是当C-NHEJ缺乏时.
POLQ在修复复杂的DSB中发挥作用,但它缺少导致与C-NHEJ缺乏症不同的突变模式.
这些发现为开发由特定DNA修复途径驱动的向重离子束突变发生系统提供了洞察力.

关键词:

另一个欧洲司法院 Alt-EJJ 对DNA损伤的反应反应碳离子光束的使用.基因组突变是一种基因组突变.基因组稳定性的基因组稳定性

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In-vitro Mutagenesis

In-vitro Mutagenesis

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