人类主要链合成的遗传和生物化学基础
Alessandro Agnarelli1, Lauryn Buckley-Benbow1, Meryem Ozgencil1
1Centre for Cancer Cell & Molecular Biology, Barts Cancer Institute, Queen Mary University of London, Charterhouse Square, EC1M 6BQ, London, UK.
Nature communications
|December 3, 2025
概括
基因组的稳定性依赖于DNA聚合酶Epsilon (Polε) 主导链合成. 我们确定了铁代谢基因,并发现了两层调节Pole的过程性,这对细胞活力至关重要.
科学领域:
- 分子生物学分子生物学
- 遗传学 遗传学是一种遗传学.
- 生物化学 生物化学
背景情况:
- 基因组稳定对于细胞生存至关重要,并通过精确的DNA复制来维持.
- 导链合成是DNA复制的一个关键步骤,主要由DNA聚合酶Epsilon (Polε) 进行.
- 波勒的功能取决于它的子单元和辅助因素,但完整的监管网络尚未完全理解.
研究的目的:
- 确定支持DNA聚合酶Epsilon (Polε) 功能的遗传因素,特别是在缺少其辅助子单元的情况下.
- 阐明了在主导链合成过程中调控Polε过程性的调节机制.
- 了解受损Pole功能对基因组稳定性的后果.
主要方法:
- 在缺乏Polε的POLE4亚单元的细胞中使用了CRISPR遗传选.
- 使用了细胞生物学技术,结构建模和生物化学分析.
- 分析了关键的Polε成分和其他细胞复合体之间的合成致命相互作用.
主要成果:
- 一个遗传地图显示,参与铁代谢的基因对于依赖铁硫 (ISC) 的Pole活动至关重要.
- 定义了两个级别的 Polε 过程性调节:通过 CHTF18-RFC2/5 引领线程特定的 PCNA 负载,以及通过 POLE3-POLE4.4 进行 dsDNA 结合.
- 这些调节功能的同时丧失被证明与主要链合成和细胞活力不相容.
结论:
- 铁代谢在通过其铁硫 (ISC) 辅因子维持Pole活动方面发挥了以前未知的作用.
- 聚烯的流动性通过不同的加载和抓机制严格调节,确保高效和准确的领先链合成.
- 这些主要链合成途径的功能障碍对基因组稳定性有严重的影响,突出了潜在的治疗点.
更多相关视频
09:04Studying Ribonucleotide Incorporation: Strand-specific Detection of Ribonucleotides in the Yeast Genome and Measuring Ribonucleotide-induced Mutagenesis
Published on: July 26, 2018
8.1K
12:35Simultaneous Mapping and Quantitation of Ribonucleotides in Human Mitochondrial DNA
Published on: November 14, 2017
9.8K
相关概念视频
01:59Lagging Strand Synthesis
60.8K
During replication, the complementary strands in double-stranded DNA are synthesized at different rates. Replication first begins on the leading strand. Replication starts later, occurs more slowly, and proceeds discontinuously on the lagging strand.
There are several major differences between synthesis of the leading strand and synthesis of the lagging strand. 1) Leading strand synthesis happens in the direction of replication fork opening, whereas lagging strand synthesis happens in the...
There are several major differences between synthesis of the leading strand and synthesis of the lagging strand. 1) Leading strand synthesis happens in the direction of replication fork opening, whereas lagging strand synthesis happens in the...
60.8K
01:59Lagging Strand Synthesis
16.2K
16.2K
02:40DNA Replication
58.2K
DNA replication involves the separation of the two strands of the double helix, with each strand serving as a template from which the new complementary strand is copied. After replication, each double-stranded DNA includes one parental or “old” strand and one “new” strand. This is known as semiconservative replication. The resulting DNA molecules have the same sequence and are divided equally into the two daughter cells.
Replication in Prokaryotes
DNA replication...
Replication in Prokaryotes
DNA replication...
58.2K
02:31Replication in Eukaryotes
202.6K
Overview
202.6K
01:29Replication in Eukaryotes
17.0K
In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
17.0K
02:35Replication in Prokaryotes
96.4K
Overview
96.4K