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相关概念视频

Overview of DNA Repair02:25

Overview of DNA Repair

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.
Chemically...
Base Excision Repair01:54

Base Excision Repair

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...
Long-patch Base Excision Repair01:02

Long-patch Base Excision Repair

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:
Base-pairing and DNA Repair02:27

Base-pairing and DNA Repair

Erwin Chargaff’s rules on DNA equivalence paved the way for the discovery of base pairing in DNA. Chargaff’s rules state that in a double-stranded DNA molecule,
Overview of DNA Repair02:25

Overview of DNA Repair

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.
Chemically...
Base Excision Repair01:54

Base Excision Repair

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: Jul 18, 2026

Atomic Force Microscopy Investigations of DNA Lesion Recognition in Nucleotide Excision Repair
10:59

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

Published on: May 24, 2017

对于DNA基底损伤的特定合作伙伴.

T J Matray1, E T Kool

  • 1Department of Chemistry, University of Rochester, New York 14627, USA.

Nature
|June 29, 1999
PubMed
概括

DNA复制可以在没有键的情况下发生,而是依赖于固态适合. 这一发现挑战了传统模型,并提供了检测DNA损伤的新方法.

科学领域:

  • 分子生物学分子生物学
  • 生物化学 生物化学
  • 遗传学 遗传学 是一个

背景情况:

  • 传统的DNA复制模型强调沃森-克里克的结,以获得基配对的忠实性.
  • 之前的研究表明,与缺乏键的非极性类似物有效复制.
  • 基于核酸大小和形状的绝缘排除是复制忠实性的潜在替代机制.

研究的目的:

  • 为了调查单独的固态互补性,没有键,可以驱动高效和特定的DNA合成.
  • 测试假设,如果保持固态适合, kanonical purin 和 pyrimidine 形状对于酶基对合成并不必不可少.
  • 探索非结核酸在DNA损伤测序中的实用性.

主要方法:

  • 使用了烯核酸三酸盐 (dPTP),是一种具有大基结构的无结合类型.
  • 评估了dPTP对面的基基位 (缺乏DNA基) 的DNA聚合酶插入的效率和特异性.
  • 在DNA中使用dPTP插入特性对基底病变进行测序.

主要成果:

  • 非结合的dPTP被DNA聚合酶高效地和特定地插入到相反的基底位点.
  • 在dPTP插入的效率接近自然基对的效率.
  • 对dPTP插入的特异性在10^2到10^4倍之间.

更多相关视频

Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage
10:59

Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage

Published on: August 21, 2021

A High-Throughput Comet Assay Approach for Assessing Cellular DNA Damage
07:57

A High-Throughput Comet Assay Approach for Assessing Cellular DNA Damage

Published on: May 10, 2022

相关实验视频

Last Updated: Jul 18, 2026

Atomic Force Microscopy Investigations of DNA Lesion Recognition in Nucleotide Excision Repair
10:59

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

Published on: May 24, 2017

Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage
10:59

Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage

Published on: August 21, 2021

A High-Throughput Comet Assay Approach for Assessing Cellular DNA Damage
07:57

A High-Throughput Comet Assay Approach for Assessing Cellular DNA Damage

Published on: May 10, 2022

结论:

  • 对于DNA合成中高效和选择性的基对形成来说,既不需要键,也不需要规范性 purin/pyrimidine 结构.
  • 固态互补性在DNA合成的忠实性中起着至关重要的作用.
  • 这些发现提供了一种用于测序基底性病变的新方法,基底性病变是一种常见的DNA损伤形式.