解读人类TK6细胞中聚类DNA损伤的修复途径:从原子力显微镜直接可视化的洞察力
Toshiaki Nakano1, Ken Akamatsu1, Masaoki Kohzaki2
1Kansai Institute for Photon Science, National Institutes for Quantum Science and Technology (QST), 8-1-7 Umemidai, Kizugawa-shi, Kyoto 619-0215, Japan.
Nucleic acids research
|January 11, 2025
概括
这项研究揭示了细胞如何修复来自辐射的聚类DNA损伤. 基和核酸切除修复处理基损伤集群,而同源重组修复复杂的双链断裂,对于理解辐射至关重要.
科学领域:
- 分子生物学分子生物学
- 辐射生物学 辐射生物学
- 遗传学 遗传学 是一个
背景情况:
- 电离辐射会导致DNA损伤,其影响因空间密度而异.
- 了解聚类DNA损伤及其修复是理解辐射致命影响和开发向治疗的关键.
- 之前的工作建立了原子力显微镜 (AFM) 用于可视化DNA损伤,并将集群分为简单的基损伤集群 (BDC),复杂的BDC和复杂的双链断裂 (DSB).
研究的目的:
- 研究不同类型的辐射诱导的聚类DNA损伤的修复机制.
- 阐明特定聚类DNA损伤类型及其修复途径之间的关联.
- 为了比较维修后的低和高线性能量转移 (LET) 辐射暴露.
主要方法:
- 使用原子力显微镜 (AFM) 可视化DNA损伤.
- 将聚类DNA损伤分为简单的BDC,复杂的BDC和复杂的DSB.
- 研究了DNA修复缺陷的人类TK6细胞和野生类型细胞在X射线和Fe离子束辐射后的修复.
主要成果:
- 基础切除修复和核酸切除修复被发现可以恢复简单和复杂的BDC.
- 野生型细胞中复杂的DSBs在辐射后的增加表明BDC被DNA甘氨酸酶分裂.
- 与致死性相关的复杂DSBs主要通过同源重组来修复,与最小的非同源端连接参与.
结论:
- 特定的DNA修复途径与由电离辐射诱导的不同类型的聚类DNA损伤有关.
- 同源重组是修复复杂的DSB的主要途径,DSB对细胞存活至关重要.
- 这些发现提升了对辐射诱导的DNA损伤修复的理解,为精确的治疗策略提供了信息.
更多相关视频
12:43Advanced Confocal Microscopy Techniques to Study Protein-protein Interactions and Kinetics at DNA Lesions
Published on: November 12, 2017
10.9K
13:10Detection and Visualization of DNA Damage-induced Protein Complexes in Suspension Cell Cultures Using the Proximity Ligation Assay
Published on: June 9, 2017
10.0K
相关概念视频
02:37DNA Damage can Stall the Cell Cycle
9.0K
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...
9.0K
02:37Restarting Stalled Replication Forks
5.7K
DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart,...
5.7K
02:04Fixing Double-strand Breaks
12.1K
The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
12.1K
01:02Long-patch Base Excision Repair
7.0K
Since the discovery of the two BER pathways, there has been a debate about how a cell chooses one pathway over the other and the factors determining this selection. Numerous in vitro experiments have pointed out multiple determinants for the sub-pathway selection. These are:
7.0K