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DNA末端切除,同源重组和DNA损伤检查点激活需要CDK1
Grzegorz Ira1, Achille Pellicioli, Alitukiriza Balijja
1Rosenstiel Center and Department of Biology, Brandeis University, Waltham, Massachusetts 02454-9110, USA.
Nature
|October 22, 2004
概括
循环素依赖激酶1 (CDK1) 对于激活DNA损伤检查点和在酵母中的双链断裂 (DSB) 后同源重组修复至关重要. CDK1还促进DNA末端切除,这是修复过程中的关键步骤.
科学领域:
- 分子生物学分子生物学
- 细胞循环规则 细胞循环规则
- 修复DNA修复DNA的修复
背景情况:
- 在DNA中的双链断裂 (DSB) 激活了DNA损伤检查点和修复通路.
- 取决于Mec1的DNA损伤检查点和同源重组 (HR) 对于保持基因组稳定性至关重要.
- 细胞循环调节器在协调这些反应中的作用尚未完全理解.
研究的目的:
- 调查循环素依赖激酶1 (CDK1) 在芽发酵酵母中对DSBs的DNA损伤反应中的作用.
- 确定CDK1在检查点激活,同源重组和DNA末端切除中的参与.
主要方法:
- 使用HO内核酶在开花酵母中诱导单个DSB.
- 使用对模拟敏感的CDK1蛋白来抑制CDK1活动.
- 评估DNA损伤检查点激活,同源重组和非同源末端连接 (NHEJ).
- 分析了像RPA和Rad51这样的DNA修复蛋白的招募,以及Mre11在DSB的积累.
主要成果:
- 通过DSB激活DNA损伤检查点需要CDK1活动.
- 在所有细胞周期阶段,CDK1对于同源重组 (HR) 是至关重要的.
- 抑制CDK1-依赖HR导致非同源端结合 (NHEJ) 的增加.
- CDK1是有效的5'到3'端切除和RPA和Rad51.1.的招募所需的.
- CDK1活动是通过持续的末端切除来维持DSB诱导的检查点所必需的.
- CDK1在HR的后期阶段,链后入侵中发挥作用.
结论:
- CDK1是一个关键的调节器,协调DNA损伤检查点的激活和在DSB之后的同源重组修复.
- 在末端切除中CDK1的功能对于检查点信号和HR都至关重要.
- CDK1活动对于芽生长酵母中有效和准确的DSB修复是不可或缺的.
相关概念视频
DNA Damage can Stall the Cell Cycle
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...
Inhibition of Cdk Activity
The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
S-Cdk Initiates DNA Replication
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 replication.
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of replication.
DNA Damage Can Stall the Cell Cycle
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...
Inhibition of CDK Activity
The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
S-Cdk Initiates DNA Replication
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 replication.
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of replication.

