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相关概念视频

The DNA Replication Fork01:02

The DNA Replication Fork

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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...
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Restarting Stalled Replication Forks02:37

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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,...
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Replication in Prokaryotes01:32

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DNA replication has three main steps: initiation, elongation, and termination. Replication in prokaryotes begins when initiator proteins bind to the single origin of replication (ori) on the cell's circular chromosome. Replication then proceeds around the entire circle of the chromosome in each direction from the two replication forks, resulting in two DNA molecules.
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The Replisome03:01

The Replisome

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DNA replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together this complex is known as the DNA replication machinery or the replisome.
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with...
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Homologous Recombination02:31

Homologous Recombination

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The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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Replication in Eukaryotes01:29

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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.
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相关实验视频

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Inducing a Site Specific Replication Blockage in E. coli Using a Fluorescent Repressor Operator System
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Inducing a Site Specific Replication Blockage in E. coli Using a Fluorescent Repressor Operator System

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复制分叉障碍,以研究特定地点的DNA复制扰动.

Jenevieve D'Souza1, Ian D Hickson1

  • 1Center for Chromosome Stability, Department of Cellular and Molecular Medicine, University of Copenhagen, Copenhagen N 2200, Denmark.

DNA repair
|July 30, 2024
PubMed
概括
此摘要是机器生成的。

这篇评论比较了基于蛋白质的系统,这些系统创建了特定站点的DNA复制叉壁垒. 这些系统提供了一种精确的方法来研究细胞对复制压力的反应,补充了传统的化学抑制剂方法.

关键词:
细胞循环检查点的检查点对DNA损伤的反应反应DNA与蛋白质的相互作用叉子保护复合体 叉子保护复合体复制应激是复制应激的一种.

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Visualization of DNA Replication in the Vertebrate Model System DT40 using the DNA Fiber Technique
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Strand-Specific Analysis of Proteins at Replicating DNA Strands by Enrichment and Sequencing of Protein-Associated Nascent DNA Method
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Visualization of DNA Replication in the Vertebrate Model System DT40 using the DNA Fiber Technique
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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:

  • 为了准确的基因组复制,DNA复制是必不可少的.
  • 传统方法使用化学抑制剂 (例如,氨酸) 来研究复制叉的进展.
  • 这些抑制剂会影响整个基因组,限制细胞反应的详细分析.

研究的目的:

  • 审查和比较基于蛋白质的复制分叉屏障系统.
  • 要突出一种替代化学抑制剂研究DNA复制扰动的替代方案.
  • 为了强调特定站点复制分叉阻滞的实用性,进行详细的细胞响应调查.

主要方法:

  • 在不同的生物体中比较各种蛋白质介导的复制分叉阻断系统.
  • 在特定的基因组位置使用高亲和度蛋白质-DNA结合的系统的分析.
  • 对生成特定站点复制分叉扰动的方法的审查.

主要成果:

  • 基于蛋白质的系统可以实现精确的,特定地点的复制分叉停滞.
  • 这些系统有助于对细胞对复制应激反应进行更多的法医调查.
  • 不同的生物采用不同的基于蛋白质的策略来控制复制.

结论:

  • 基于蛋白质的复制叉壁垒是了解DNA复制的宝贵工具.
  • 特定地点的干扰允许详细研究细胞应对机制.
  • 这种方法通过提供更高的精度来补充传统方法.