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相关概念视频

Translesion DNA Polymerases02:10

Translesion DNA Polymerases

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Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...
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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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Mismatch Repair01:20

Mismatch Repair

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Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
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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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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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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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Updated: May 21, 2025

Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage
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Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage

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复制后的损伤处理限制了DNA损伤引起的突变发生.

Katarzyna H Masłowska1, Ronald P Wong2, Helle D Ulrich2

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

Nucleic acids research
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PubMed
概括
此摘要是机器生成的。

细胞使用转化合成 (TLS) 和损伤避免 (DA) 来绕过复制过程中的DNA损伤. 这项研究揭示了TLS时间变化,影响基因组稳定性和突变风险.

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Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage
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Using Next Generation Sequencing to Identify Mutations Associated with Repair of a CAS9-induced Double Strand Break Near the CD4 Promoter
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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.
  • DNA 修复机制的修复机制

背景情况:

  • DNA 病变对基因组稳定性构成重大威胁.
  • 细胞使用转化合成 (TLS) 和损伤避免 (DA) 途径来应对损伤带来的DNA复制挑战.
  • TLS涉及核酸插入相反的病变,冒着突变的风险,而DA则使用同源重组来实现无错误的绕道.

研究的目的:

  • 为了研究酵母中DNA损伤绕行机制的时间动态.
  • 了解病变绕道的时间如何影响DNA复制的准确性.
  • 阐明TLS和DA途径在保持基因组完整性方面的相互作用.

主要方法:

  • 在酵母模型中研究了病变绕道时间.
  • 分析了特定DNA聚合酶 (η,Rev1,Pol ζ) 和Exo1核酶的作用.
  • 检查了TLS和DA路径之间的竞争在复制后的差距.

主要成果:

  • DNA聚合酶 η 在损伤发生后立即绕过在复制叉上的紫外线诱导的环丁胺二次体.
  • (6-4) 光产品和G-AAF adducts的TLS发生在复制后的空隙中,在叉子后面,由Rev1和Pol ζ.介导.
  • 在复制后的空隙中,TLS与无错误的DA通路竞争,从而降低了总体的致变性.
  • Exo1核酶调节复制后差距大小,影响TLS和DA之间的平衡.

结论:

  • 对于精确的DNA病变绕过来说,TLS的时间是至关重要的,因为不同的病变和聚合酶表现出不同的绕过策略.
  • 在复制后缺口中TLS和DA路径之间的竞争是最大限度地减少复制错误的关键机制.
  • Exo1核酶通过控制突变性和无错误绕行之间的平衡,在DNA损伤耐受性中发挥调节作用.