由DNA损伤引起的YTHDC1 O-GlcNAcylation通过增强m6A结合来促进同源重组
Mengyao Li1, Jie Li2, Yibo Wang3
1College of Life Sciences, Institute of Life Sciences and Green Development, Hebei University, Baoding 071002, China.
Fundamental research
|April 17, 2025
概括
对N6-甲基氨酸 (m6A) 阅读器YTHDC1的O-链接β-N-乙糖胺 (O-GlcNAc) 修改对于其染色体结合和与m6ARNA相互作用至关重要. 这种糖化促进DNA修复和细胞存活.
科学领域:
- 分子生物学分子生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 生物化学 生物化学
背景情况:
- N6-甲基氨酸 (m6A) 是一种普遍存在的调节基因表达的RNA修饰.
- 像YTHDC1这样的A阅读器在DNA损伤修复中发挥作用,特别是同源重组 (HR).
- 在DNA修复过程中,m6A修饰和糖基化之间的相互作用在很大程度上仍未被探索.
研究的目的:
- 为了研究O链接β-N-乙糖胺 (O-GlcNAc) 修饰在m6A读者YTHDC1在DNA损伤反应中的作用.
- 阐明YTHDC1 O-GlcNAcylation,m6ARNA结合和同源重组之间的功能关系.
主要方法:
- 在DNA损伤时研究了YTHDC1的修饰.
- 利用RNA免疫沉 (RIP) 和分子动力学 (MD) 模拟来评估YTHDC1-m6ARNA相互作用.
- 在光漂白后使用光恢复 (FRAP) 来分析YTHDC1凝结物形成.
- 评估了YTHDC1 O-GlcNAcylation对DNA损伤修复和细胞存活的影响.
主要成果:
- 在DNA受损时,YTHDC1在Ser396进行O-GlcNAcylation,这对其染色质结合和焦点形成至关重要.
- O-GlcNAcylation对于YTHDC1与m6ARNA相互作用以及DNA损伤诱导的YTHDC1-m6A凝结物的形成至关重要.
- YTHDC1 O-GlcNAcylation促进同源重组修复和细胞存活,可能是通过将Rad51招募到DNA损伤部位.
结论:
- YTHDC1的O-GlcNAcylation是一个关键的调节机制,将m6ARNA识别与DNA损伤修复联系起来.
- YTHDC1 O-GlcNAcylation 在促进同源重组和保持基因组稳定性方面起着重要作用.
- 这项研究揭示了RNA修饰和糖化在DNA损伤反应途径之间的新相互作用.
相关概念视频
01:08Nucleotide Excision Repair
Overview
02:36DNA Damage can Stall the Cell Cycle
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
02:31Homologous Recombination
The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
01:38Nucleotide Excision Repair
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Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
02:31Homologous Recombination
The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
02:36DNA Damage Can Stall the Cell Cycle
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...