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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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Homologous Recombination02:31

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Nucleotide Excision Repair01:08

Nucleotide Excision Repair

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Overview
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Nucleotide Excision Repair01:38

Nucleotide Excision Repair

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DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
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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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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: Jan 18, 2026

Atomic Force Microscopy Investigations of DNA Lesion Recognition in Nucleotide Excision Repair
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Atomic Force Microscopy Investigations of DNA Lesion Recognition in Nucleotide Excision Repair

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RecBC复合体在病变绕道过程中保护单链DNA缺口.

Gaëlle Philippin1, Pauline Dupaigne2, Élodie Chrabaszcz1

  • 1Cancer Research Center of Marseille: Team DNA Damage and Genome Instability|CNRS, Inserm, Institut Paoli-Calmettes, Aix Marseille Université, Marseille 13009, France.

Proceedings of the National Academy of Sciences of the United States of America
|September 10, 2025
PubMed
概括
此摘要是机器生成的。

RecBC复合体在复制过程中保护新生的DNA,防止像EXOI这样的核酶降解. 这确保了通过转移合成或同质导向缺口修复有效的DNA损伤绕道.

关键词:
耐受性 耐受性 耐受性 DNA 损伤发生DNA损伤.在RecBCBC中使用.单链DNA间隙是一个单链DNA间隙.转化合成的转化合成

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Characterizing DNA Repair Processes at Transient and Long-lasting Double-strand DNA Breaks by Immunofluorescence Microscopy
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Characterizing DNA Repair Processes at Transient and Long-lasting Double-strand DNA Breaks by Immunofluorescence Microscopy

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Visualization of DNA Repair Proteins Interaction by Immunofluorescence
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Visualization of DNA Repair Proteins Interaction by Immunofluorescence

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相关实验视频

Last Updated: Jan 18, 2026

Atomic Force Microscopy Investigations of DNA Lesion Recognition in Nucleotide Excision Repair
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Characterizing DNA Repair Processes at Transient and Long-lasting Double-strand DNA Breaks by Immunofluorescence Microscopy
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科学领域:

  • 分子生物学分子生物学
  • 遗传学 遗传学是一种遗传学.
  • 修复DNA修复DNA的修复

背景情况:

  • 在未被修复的病变中,DNA复制停止,形成单链DNA (ssDNA) 间隙.
  • 这些差距是通过转载合成 (TLS) 或同质导向差距修复 (HDGR) 修复的.

研究的目的:

  • 研究RecBC复合体在DNA损伤耐受性中的新型作用.
  • 了解RecBC如何在复制重启期间保护新生的DNA.

主要方法:

  • 在DNA损伤旁路中对RecBC功能的遗传分析.
  • 研究RecBC,EXOI和新生DNA之间的相互作用.

主要成果:

  • RecBC保护新生DNA免受EXOI的降解,独立于其催化活性和RecD子单元.
  • RecBC对于高效的TLS和HDGR至关重要,特别是在强大的阻塞病变中.
  • 丢失RecBC允许EXOI降解新生的DNA,从而降低了病变耐受性.

结论:

  • 在复制重启期间,RecBC在保护新生的DNA方面发挥着非正规的作用.
  • 这种保护功能在各个物种中保持着,类似于人类的BRCA2.
  • 在DNA受损后,RecBC对于保持基因组完整性至关重要.