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相关概念视频

Homologous Recombination02:31

Homologous Recombination

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...
Homologous Recombination02:31

Homologous Recombination

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...
Restarting Stalled Replication Forks02:37

Restarting 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...
Restarting Stalled Replication Forks02:37

Restarting 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...
Replication in Prokaryotes01:32

Replication in Prokaryotes

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.
Many Proteins Work Together to Replicate the Chromosome
Replication is coordinated and carried out by a host of specialized...
Replication in Prokaryotes02:35

Replication in Prokaryotes

Overview

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相关实验视频

Updated: May 8, 2026

Visualization of DNA Repair Proteins Interaction by Immunofluorescence
07:55

Visualization of DNA Repair Proteins Interaction by Immunofluorescence

Published on: June 26, 2020

在断裂诱导的复制过程中,迁移泡驱动了保守的DNA合成.

Natalie Saini1, Sreejith Ramakrishnan, Rajula Elango

  • 1School of Biology and Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, Georgia 30332, USA.

Nature
|September 13, 2013
PubMed
概括

断裂诱导复制 (BIR) 是一种DNA修复途径,导致遗传不稳定. 我们的研究表明,BIR使用了独特的复制叉,而不是标准的半保守复制,导致突变增加和潜在的癌症发展.

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Detection of Homologous Recombination Intermediates via Proximity Ligation and Quantitative PCR in Saccharomyces cerevisiae
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Detection of DNA Breaks in Dividing Human Cells by Neutral Comet Assay
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Detection of DNA Breaks in Dividing Human Cells by Neutral Comet Assay

Published on: August 23, 2024

相关实验视频

Last Updated: May 8, 2026

Visualization of DNA Repair Proteins Interaction by Immunofluorescence
07:55

Visualization of DNA Repair Proteins Interaction by Immunofluorescence

Published on: June 26, 2020

Detection of Homologous Recombination Intermediates via Proximity Ligation and Quantitative PCR in Saccharomyces cerevisiae
07:55

Detection of Homologous Recombination Intermediates via Proximity Ligation and Quantitative PCR in Saccharomyces cerevisiae

Published on: September 11, 2022

Detection of DNA Breaks in Dividing Human Cells by Neutral Comet Assay
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Detection of DNA Breaks in Dividing Human Cells by Neutral Comet Assay

Published on: August 23, 2024

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:

  • 染色体双链断裂 (DSB) 需要修复,以保持基因组完整.
  • 矛盾的是,DSB修复途径,如断裂诱导复制 (BIR),可以导致遗传不稳定性,突变和染色体重组,从而导致致癌症.
  • 众所周知,BIR会促进遗传不稳定性,包括增加突变率,异构性丧失和拷贝数变化.

研究的目的:

  • 为了研究在断裂诱导复制 (BIR) 过程中DNA复制的机制.
  • 要确定BIR是否通过半保守的复制进行,就像正常的S相复制一样.
  • 为了阐明与BIR相关的高突变率的原因.

主要方法:

  • 利用芽生长酵母作为一个模型生物.
  • 在BIR期间分析了复制叉结构.
  • 研究了Pif1螺旋酶在BIR相关突变发生中的作用.

主要成果:

  • 证明了BIR在芽酵母中的复制通过一种不寻常的类似泡的复制叉进行.
  • 表明这种非典型的复制机制导致新合成的DNA的保守遗传.
  • 提供了证据表明,Pif1螺旋酶对于这种复制模式和相关突变增加至关重要.

结论:

  • BIR复制与S相复制有很大的不同,它采用了独特的,不稳定的分叉结构.
  • 这种独特的复制机制是BIR期间观察到的突变率升高的原因.
  • 由BIR驱动的合成是真核生物中遗传不稳定的强大来源,可能导致癌症的发病.