相关实验视频
Updated: May 10, 2026
07:27
Direct Restart of a Replication Fork Stalled by a Head-On RNA Polymerase
Published on: April 30, 2010
Dna2为停滞的分叉提供支持.
1Fondazione Istituto FIRC di Oncologia Molecolare, IFOM-IEO Campus, Milan, Italy.
Cell
|June 12, 2012
概括
在ATR和ATM基因酶保护复制染色体. 胡和其他人. 他们发现ATR途径准Dna2核酶,以处理停滞不前的复制分叉并防止它们的逆转.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 细胞生物学 细胞生物学
背景情况:
- 在DNA复制过程中,复制叉的稳定性对基因组完整性至关重要.
- ATR (Ataxia Telangiectasia和Rad3相关) 和ATM (Ataxia Telangiectasia突变) 是关键的检查点激酶,可以保护复制染色体.
- 复制分叉逆转是一种可以导致染色体不稳定的机制.
研究的目的:
- 调查ATR路径在处理停滞的复制分叉中的作用.
- 为了确定参与抵消复制叉逆转的特定核酶.
- 阐明ATR在停滞的分叉中保持基因组稳定的机制.
主要方法:
- 利用分子生物学技术研究复制叉的动力学.
- 采用遗传方法来分析ATR和Dna2.2的功能.
- 研究了蛋白质相互作用和细胞局部化.
主要成果:
- 证明ATR路径专门针对Dna2核酶.
- 显示了Dna2过程中停滞的复制分叉.
- 确认ATR介导的Dna2活动抵消了复制分叉逆转.
结论:
- 该ATR途径在基因组维护中发挥着关键作用,通过招募Dna2到停滞不前的复制分叉.
- 停滞的叉子的Dna2介导处理可以防止潜在的有害的叉子反转.
- 这种机制对于保持复制染色体的完整性至关重要.
相关概念视频
01:02The 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...
02:36DNA 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...
02:37Restarting Stalled Replication Forks
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, a...
01:02The 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...
02:36DNA 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...
02:37Restarting Stalled Replication Forks
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, a...