DNA复制机器发送双重信号,以防止非计划的许可和执行中心体复制的执行
Kyohei Matsuhashi1, Kei K Ito1, Kaho Nagai1
1Department of Physiological Chemistry, Graduate School of Pharmaceutical Science, The University of Tokyo, Bunkyo, Tokyo, Japan.
Nature communications
|September 8, 2025
概括
通过DONSON蛋白,DNA复制机器控制着细胞中心体的复制,防止细胞分裂中的错误. 这一发现直接将DNA复制与精确的染色体分离联系起来.
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 是一个
背景情况:
- 精确的遗传依赖于受控的DNA和中心细胞复制数.
- DNA复制和中核体复制是细胞分裂中至关重要的并行事件.
研究的目的:
- 为了研究DNA复制机器如何调节中枢细胞组复制.
- 为了确定防止中心细胞扩增的机制.
主要方法:
- 研究了小头蛋白DONSON的作用.
- 研究了DNA复制启动与Cdc6转位的合.
- 在复制过程中分析了DONSON与CMG酶的相互作用.
主要成果:
- 唐森将DNA复制的启动与Cdc6转位联系起来,防止过早的中心球脱离.
- DONSON 抑制了复杂体解体,保持了阻断中枢体重复的 S/G2 检查点信号.
- 干扰导致 DONSON 患者细胞中早期的中心细胞复制和染色体错误分离.
结论:
- 基因复制机器直接控制中心细胞复制许可和执行.
- 唐森作为一个关键的调节器,将DNA复制与中心细胞循环控制相结合.
- 这种机制确保了精确的遗传物质重复和分离.
相关概念视频
02:37Restarting Stalled Replication Forks
6.3K
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,...
6.3K
02:37Restarting Stalled Replication Forks
2.3K
2.3K
02:38S-Cdk Initiates DNA Replication
5.3K
The cell cycle is a series of events leading to DNA duplication followed by the division of cell content to form two daughter cells. The cell cycle progresses in four stages—the cell increases in size (gap 1 or G1-phase), duplicates its DNA (synthesis or S-phase), prepares to divide (gap 2 or G2-phase), and divides (mitosis or M-phase).
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of...
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of...
5.3K
02:25Centrosome Duplication
4.8K
The primary microtubule organizing center (MTOC) in animal cells is the centrosome. A centrosome has two cylindrical centrioles at its core. Each centriole consists of nine sets of three microtubules held together by proteins. The centrioles are positioned at right angles to each other and surrounded by a shapeless protein cloud called the pericentriolar matrix, or pericentriolar material (PCM).
To ensure that each daughter cell receives a centrosome after cell division, centrosome duplication...
To ensure that each daughter cell receives a centrosome after cell division, centrosome duplication...
4.8K
02:36DNA 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
02:36DNA 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