相关实验视频
Updated: Sep 15, 2025
07:55
Visualization of DNA Repair Proteins Interaction by Immunofluorescence
Published on: June 26, 2020
10.4K
53BP1/RIF1和DNA-PKcs显示出与各种染色体断裂修复结果的独特遗传相互作用
Kaela Makins1,2, Metztli Cisneros-Aguirre1,2,3, Felicia Wednesday Lopezcolorado1
1Department of Cancer Genetics and Epigenetics.
bioRxiv : the preprint server for biology
|July 14, 2025
概括
53BP1和DNA-PKcs在DNA双链断裂修复中具有不同的作用. 它们以不端的连接作用相互备份,但独立地抑制微同质性删除和同质性导向修复.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 癌症研究 癌症研究
背景情况:
- DNA双链断裂 (DSB) 是由癌症放射治疗引起的关键DNA病变.
- 53BP1是参与DSB修复的关键蛋白质,但其作用超出了正规非同类末端连接 (C-NHEJ) 的范围.
研究的目的:
- 阐明53BP1和C-NHEJ成分之间的遗传相互作用,特别是DNA-PKcs激酶.
- 了解53BP1和DNA-PKcs在各种DNA双链断裂修复途径中的不同贡献.
主要方法:
- 使用Cas9诱导的凸DSB,专门研究末端连接 (EJ) 修复.
- 评估了53BP1,DNA-PKcs和RIF1中的遗传干扰 (功能丧失) 对DSB修复结果的影响.
- 研究了DNA-PKcs激酶抑制对细胞辐射敏感性的影响.
主要成果:
- 53BP1的损失并没有影响的DSB EJ,但减少了DNA-PKcs缺陷细胞的修复,这表明了备份作用.
- 无论是53BP1还是DNA-PKcs,都独立地抑制了微同质的删除和同质导向的修复.
- RIF1的损失反映了53BP1的影响,表明它在同一途径中的作用.
- 由于DNA-PKcs的抑制导致了辐射敏感性,而不是与53BP1/RIF1损失的添加.
结论:
- 53BP1/RIF1和DNA-PKcs表现出明显的遗传相互作用,影响着不同的DSB修复结果.
- 这些发现澄清了放射治疗和基因编辑疗效至关重要的DNA修复途径的复杂相互作用.
相关概念视频
02:04Fixing Double-strand Breaks
12.9K
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...
12.9K
02:37Restarting Stalled Replication Forks
5.9K
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,...
5.9K
02:31Homologous Recombination
52.4K
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...
52.4K
01:02Long-patch Base Excision Repair
7.2K
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:
7.2K
02:37DNA Damage can Stall the Cell Cycle
9.3K
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...
9.3K
01:02The DNA Replication Fork
36.9K
An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork. Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication...
36.9K