修复和DNA聚合酶绕过可点击的金胺核酸的修复和绕过
Anton V Endutkin1, Anna V Yudkina1, Timofey D Zharkov1
1Siberian Branch of the Russian Academy of Sciences Institute of Chemical Biology and Fundamental Medicine, 8 Lavrentieva Ave., 630090 Novosibirsk, Russia.
Biomolecules
|June 27, 2024
概括
可点击的核化物,如5-乙烯基-2'-脱氧氨酸 (EtU),可以通过DNA糖化酶进行修复,并引起突变. 然而,这些合成后事件在细胞中并不常见.
科学领域:
- 分子生物学分子生物学
- 生物化学 生物化学
- DNA 修复机制的修复机制
背景情况:
- 可点击核化物,如5-乙-2-欧米诺-脱氧氨酸 (EtU),是研究DNA复制和DNA功能化的重要工具.
- 嵌入式可点击核酸的合成后修改,包括修复和错误编码,尚不清楚.
研究的目的:
- 调查EtU和更大的可点击的金胺核化物 (C8-AlkU,C8-AlkC) 的修复和 (错误) 编码潜力.
- 为了确定这些核酸对DNA复制忠实性和细胞环境中的持久性的影响.
主要方法:
- 在体外切除试验中,使用DNA糖系酶SMUG1和MBD4.4进行了切除试验.
- 在人体细胞中使用光记者等离子体的体内研究.
- 对跨越ETU,C8-AlkU和C8-AlkC的DNA聚合酶绕行和错误整合的分析.
主要成果:
- 在体外,ETU和C8-AlkU被SMUG1和MBD4切除;C8-AlkC没有.
- 与 uracil 相比,EtU 和 C8-AlkU 在人体细胞中的持久性增加.
- 基因聚合酶通常可以绕过这些可点击的核化物,并且没有错误,但观察到一些错误的结合,特别是在DNA聚合酶β.
结论:
- 可点击的pyrimidine核酸可以受到DNA修复途径的影响,并可能导致突变.
- 虽然修复和错误编码是可能的,但这些事件在细胞中的总体频率可能很低.
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