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相关概念视频

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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Conservative Site-specific Recombination and Phase Variation02:53

Conservative Site-specific Recombination and Phase Variation

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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
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Restarting Stalled Replication Forks02:37

Restarting Stalled Replication Forks

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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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Long-patch Base Excision Repair01:02

Long-patch Base Excision Repair

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Since the discovery of the two BER pathways, there has been a debate about how a cell chooses one pathway over the other and the factors determining this selection. Numerous in vitro experiments have pointed out multiple determinants for the sub-pathway selection. These are:
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Fixing Double-strand Breaks02:04

Fixing Double-strand Breaks

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The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
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Base Excision Repair01:54

Base Excision Repair

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One of the common DNA damages is the chemical alteration of single bases by alkylation, oxidation, or deamination. The altered bases cause mispairing and strand breakage during replication. This type of damage causes minimal change to the DNA double helix structure and can be repaired by the base excision repair (BER) pathways. BER corrects damaged DNA sequences by removing the damaged base and restoring the original base sequence using the complementary strand as a template.
The first step of...
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相关实验视频

Updated: Jun 11, 2025

Detection of Homologous Recombination Intermediates via Proximity Ligation and Quantitative PCR in Saccharomyces cerevisiae
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53BP1缺乏导致使用断裂诱导复制 (BIR) 的超重组.

Sameer Bikram Shah1, Youhang Li1,2, Shibo Li1,3

  • 1Department of Molecular and Cell Biology, The Scripps Research Institute, La Jolla, CA, 92037, USA.

Nature communications
|October 5, 2024
PubMed
概括

53BP1通过防止单链突起的DNA合成来抑制突变性断裂诱导复制 (BIR). 53BP1的丧失激活了BIR,导致基因组不稳定,并提供了癌症治疗目标.

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相关实验视频

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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.
  • 癌症研究 癌症研究

背景情况:

  • 断裂诱导复制 (BIR) 是一种突变性DNA修复途径.
  • 人们对BIR的监管及其在双链断裂 (DSB) 修复中的作用仍然不太了解.
  • 53BP1以其在DSB端保护中的作用而闻名.

研究的目的:

  • 研究53BP1在抑制BIR中的作用.
  • 阐明管理BIR调节和DSB修复路径选择的机制.
  • 探索针对53BP1和BIR之间的相互作用的治疗潜力.

主要方法:

  • 研究了53BP1在DSB中抑制BIR的功能.
  • 在53BP1缺陷细胞中分析了BIR类的超重组.
  • 研究了Polα-primase,PCNA无化和PIF1在BIR激活中的作用.
  • 研究了53BP1在涉及SMARCAD1的破碎复制叉上的功能.

主要成果:

  • 53BP1的丧失会诱导一种依赖于Polα-primase的BIR类过度组合.
  • 53BP1缺乏导致PCNA无化和PIF1招募,激活BIR.
  • 在断裂的叉子上,SMARCAD1取代了53BP1以促进BIR激活.
  • 53BP1缺陷导致模板切换和大量删除,导致基因组不稳定.

结论:

  • 53BP1在DSB的末端切除后抑制BIR起着至关重要的作用,与其末端保护作用不同.
  • 53BP1和BIR通路之间的相互作用提供了合成致命性,为向癌症治疗提供了机会.
  • 了解53BP1在BIR调节中的功能是防止基因组不稳定性的关键.