世界各地的DNA损伤 INO80天
1Howard Hughes Medical Institute and Department of Oncological Sciences, Huntsman Cancer Institute, University of Utah School of Medicine, Salt Lake City, UT 84112, USA.
Cell
|December 21, 2004
概括
DNA双链断裂的修复需要INO80染色体重塑复合物. 这种复合物通过与酸化组合素H2A的相互作用而被招募,突出显示染色素.
科学领域:
- 分子生物学分子生物学
- 染色体生物学 染色体生物学
- 修复DNA修复DNA的修复
背景情况:
- 检测和修复DNA损伤发生在复杂的染色质环境中.
- 了解DNA修复的分子机制对于细胞健康至关重要.
研究的目的:
- 为了研究染色体重塑复合体在DNA双链断裂修复中的作用.
- 为了确定特定的分子相互作用,参与招募修复机械到DNA损伤地点.
主要方法:
- 研究了对DNA损伤部位的染色质重塑复合物的招募.
- 检查了修复蛋白质和修改的基因组之间的相互作用.
主要成果:
- 证明INO80染色体重塑复合物在双链断裂修复过程中被招募.
- 表明这种招募是通过与酸化组合素H2A的相互作用进行的.
结论:
- INO80复合体在染色质对DNA双链断裂的反应中起着至关重要的作用.
- 酸化组合素H2A作为一个关键的识别站点,用于招募INO80到DNA损伤站点.
相关概念视频
01:08Nucleotide Excision Repair
Overview
02:25Overview 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...
Chemically...
01:08Nucleotide Excision Repair
Overview
02:36DNA Damage can Stall the Cell Cycle
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...
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...
02:36DNA Damage Can Stall the Cell Cycle
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...