相关实验视频
Updated: May 16, 2026
10:59
Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage
Published on: August 21, 2021
大型基因网络的身份和功能,是DNA断裂的突变性修复的基础
Abu Amar M Al Mamun1, Mary-Jane Lombardo, Chandan Shee
1Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030-3411, USA.
Science (New York, N.Y.)
|December 11, 2012
概括
研究人员在细菌中发现了一个由93个基因组成的网络,该基因修复DNA断裂并引起突变. 这个网络感知压力,并将修复整合到细胞生物学中,提供潜在的药物点.
科学领域:
- 微生物学和分子生物学
- DNA 修复和突变发生机制.
- 细菌应激反应的应激反应
背景情况:
- DNA修复和突变发生涉及许多蛋白质,但对所有必要组件的完整理解仍然难以捉摸.
- 识别控制这些过程的全部蛋白质网络对于理解细胞对DNA损伤的反应至关重要.
研究的目的:
- 确定和功能性地描述负责突变性修复应激大肠杆菌中DNA断裂的基因网络.
- 阐明这种网络如何将DNA修复整合到细胞应激反应和环境感知中.
主要方法:
- 使用全面的基因选来识别参与突变的基因.
- 分析的重点是基因在关键应激反应调节器 (RpoS,RpoE,SOS) 上游起作用.
主要成果:
- 鉴定出至少93个基因的网络在细菌突变中起作用.
- 大多数已识别的基因似乎在RpoS,RpoE和SOS压力反应的上游运行,这表明它们在压力感知中发挥了作用.
- 该研究揭示了环境感应的具体途径,并强调了应激反应的核心作用.
结论:
- 已识别的网络将突变性DNA修复整合到应激大肠杆菌的更广泛的生物学中.
- 细菌应激反应是这一过程的核心,并代表了抑制病原体进化的潜在药物标.
相关概念视频
01:38Nucleotide Excision Repair
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...
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...
01:08Nucleotide Excision Repair
Overview
01:08Nucleotide Excision Repair
Overview
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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.
Chemically...
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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.
Chemically...
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01:20Mismatch Repair
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.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...