在非重复性内源性位点对DNA损伤反应的时间过程的成像
Adam T Rybczynski1, W Taylor Cottle2, Po-Ta Chen3
1Howard Hughes Medical Institute and Program in Cellular and Molecular Medicine, Boston Children's Hospital, Boston, MA, USA; Department of Biology, Johns Hopkins University, Baltimore, MD, USA.
Cell reports methods
|November 4, 2025
概括
研究人员开发了一种新方法来追踪DNA双链断裂 (DSB) 修复动态. 这项技术使用CRISPR和GOLDFISH以高时间分辨率可视化修复因子,如γH2AX,53BP1和BRCA1.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 细胞生物学 细胞生物学
背景情况:
- 双链DNA断裂 (DSB) 是高度有毒的DNA病变.
- 了解DSB修复的动态对于细胞生存和基因组稳定性至关重要.
- 现有的方法往往缺乏捕捉快速修复事件所需的空间和时间分辨率.
研究的目的:
- 开发一种新的方法来跟踪DSB修复因子的时空动态.
- 为了使DSB修复在内生位置的高分辨率动态测量.
- 研究DSB修复过程中修复因子招募和焦点形成的动力学.
主要方法:
- 结合使用非常快的CRISPR技术进行快速的DSB诱导,并通过GOLDFISH进行基因组标记 (通过局部变性光在现场杂交).
- 优化了保护关键修复签名的协议,包括γH2AX,53BP1和BRCA1.1.
- 应用了该方法来测量DSB焦点形成的动力学在非重复的内源性位置.
主要成果:
- 在特定的基因组位置成功跟踪了DSB修复的进展.
- 在数分钟范围内实现了DSB焦点形成动力学的时间分辨率.
- 证明了测量像 γH2AX,53BP1 和 BRCA1.1 这样的修复因子的招募动态的能力.
结论:
- 开发的方法为研究DSB修复动态提供了前所未有的时空分辨率.
- 这种技术允许精确的动力测量在内生位置的修复因子招募.
- 有助于更深入地了解细胞对DNA损伤和修复机制的反应.
相关概念视频
DNA Damage can Stall the Cell Cycle
10.0K
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...
10.0K
DNA Damage Can Stall the Cell Cycle
3.0K
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...
3.0K
Homologous Recombination
62.5K
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...
62.5K
Nucleotide Excision Repair
5.0K
DNA Distortion and Damage
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...
5.0K
Nucleotide Excision Repair
40.6K
Overview
40.6K
Fixing Double-strand Breaks
14.3K
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...
14.3K


