通过SAPK对复制和转录的协调控制可以保护基因组完整性
Alba Duch1, Irene Felipe-Abrio, Sonia Barroso
1Cell Signaling Unit, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra, Barcelona E-08003, Spain.
Nature
|November 27, 2012
概括
压力激活的蛋白激酶Hog1通过酸化Mrc1.1来协调DNA复制和转录. 这通过避免这些过程之间的冲突来防止基因组不稳定.
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 是一个遗传学.
背景情况:
- 细胞必须在环境压力期间管理基因表达变化.
- 协调转录和复制对于防止DNA损伤和重组至关重要.
- 应激激活蛋白激酶 Hog1 (SAPK Hog1) 在 S 阶段诱导应激反应基因.
研究的目的:
- 为了调查Saccharomyces cerevisiae如何协调DNA复制和转录在压期间.
- 阐明Hog1和Mrc1在压力下管理细胞过程中的作用.
主要方法:
- 研究了Hog1对Mrc1的相互作用和酸化.
- 分析了Mrc1酸化对复制原始发射和进展的影响.
- 使用具有特定突变的Saccharomyces cerevisiae菌株 (mrc1(3A)) 来评估功能后果.
主要成果:
- Hog1在不同的部位酸化Mrc1,独立于DNA损伤途径 (Mec1, Rad53).
- Hog1介导的Mrc1酸化延迟了复制原始点火,并减缓了复制复杂的进展.
- 具有非酸化Mrc1 (mrc1(3A)) 的细胞表现出增加的转录相关重组和基因组不稳定性.
结论:
- Hog1和Mrc1建立了一个新的S相检查点,与DNA损伤检查点分开.
- 这种Hog1-Mrc1通路使细胞能够在压过程中防止DNA复制和转录之间的冲突.
- 这些发现突出了一个关键的机制,以维持真核细胞的基因组稳定性.
相关概念视频
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.
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.
The DNA Replication Fork
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 forks, one in...
The DNA Replication Fork
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 forks, one in...
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...
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...

