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相关概念视频

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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In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a million damaging events by natural causes and external factors. Ionizing radiation such as UV rays, free radicals produced during cellular respiration, and hydrolytic damage from metabolic reactions can alter the structure of DNA. Damages caused include single-base alteration, base dimerization, chain breaks, and cross-linkage.
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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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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.
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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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快照: DNA 修复途径

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细胞不断修复来自内部和外部来源的DNA损伤,使用多种保存的途径. 这篇概述详细介绍了关键的DNA修复机制,它们准的病变以及它们的核心功能.

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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:

  • 对于细胞功能和遗传来说,DNA至关重要.
  • DNA容易受到内源性和环境因素的损伤.
  • 细胞拥有复杂的DNA修复系统,以保持基因组完整性.

研究的目的:

  • 概述细胞中主要的DNA修复途径.
  • 为了确定每个途径所针对的初级DNA病变.
  • 描述参与DNA修复的关键分子参与者和交易.

主要方法:

  • 审查和综合建立的DNA修复知识.
  • 基于病变类型和机制的DNA修复途径的分类.
  • 确定每个途径的核心酶和蛋白质复合体.

主要成果:

  • 详细描述主要的DNA修复途径,包括基脱离修复 (BER),核酸脱离修复 (NER),不匹配修复 (MMR) 和双链断裂修复 (DSBR).
  • 特定的DNA损伤的关联 (例如,氧化损伤,重的附加物,不匹配,双链断裂) 与它们各自的修复途径.
  • 突出保护原则和跨物种的关键分子参与者.

结论:

  • 多重重叠的DNA修复途径对于保持基因组稳定性至关重要.
  • 了解这些途径对于理解细胞对遗传毒性压力的反应至关重要.
  • 这些保存的机制强调了DNA修复对所有生命形式的根本重要性.