无孔Nup98凝结剂可以调动异色破裂并排除Rad51
Chiara Merigliano1, Taehyun Ryu2, Jakub Cibulka3
1Department of Biological Sciences, Molecular and Computational Biology Section, University of Southern California, Los Angeles, CA 90089, USA.
Molecular cell
|June 6, 2025
概括
核孔蛋白Nup98形成了不同的隔间,将DNA修复部位重新定位. 这样可以防止异色染色素的有害重组,确保基因组的完整性.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 遗传学 遗传学是一种遗传学.
背景情况:
- 由相分离形成的无膜隔间对于细胞功能,如DNA修复至关重要.
- 周中心的异质色素,富含重复序列,容易发生异常重组.
- 在Drosophila heterochromatin中同源重组 (HR) 修复需要在DNA修复因子招募之前将其迁移到核外围.
研究的目的:
- 为了研究Drosophila heterochromatin中DNA修复部位调动的机制.
- 阐明相分离和核波林在调节同源重组修复中的作用.
- 了解基因组完整性如何在重复的DNA序列中保持.
主要方法:
- 在DNA修复场所对核波林 (Nup98,Sec13,Nup88) 的招募分析.
- 调查Nup98和异色素蛋白1 (HP1) 凝结物之间的空间关系.
- 评估Nup98凝聚剂对DNA修复部位调动和Rad51排除的功能要求.
- 分析途径中断对异染色素修复和染色体稳定性的影响.
主要成果:
- 努普98被招募到Sec13/Nup88的上游和Smc5/6/HP1.1的下游的DNA修复站点.
- 而Nup98的冷凝物与HP1的冷凝物是不可混合的.
- 对于调动维修工地和排除Rad51.1,Nup98凝结物是必不可少的,也是足够的.
- 这种途径的破坏导致异染色素修复缺陷和染色体重排.
结论:
- 通过Nup98介导的相分离驱动了DNA修复部位的动员,使其远离异色染色蛋白1.
- 这一过程通过排除Rad51来防止异常重组,从而促进精确的同源重组修复.
- 核波林在核组织和基因组稳定性中通过"异孔"相分离机制发挥着关键作用.
关键词:
这就是Nup88的原因.在Nup98的冷凝物中,Nup98的冷凝物第13节 第13节双链断裂修复 双链断裂修复滴滴滴滴滴滴滴滴滴滴滴滴滴滴异染色素修复的修复方法同类的重组组合.核动力学的核动力学核塑料中的核素核素.阶段分离的阶段分离.更多相关视频
相关概念视频
Homologous Recombination
52.8K
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...
52.8K
Restarting 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
Nucleotide Excision Repair
3.9K
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...
3.9K
Fixing 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
Long-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
Conservative Site-specific Recombination and Phase Variation
6.2K
Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
The recognition sites for Cre recombinase called LoxP...
6.2K


