在DNA受损后挑战死亡
T Rich1, R L Allen, A H Wyllie
1Department of Pathology, University of Cambridge, UK.
Nature
|October 26, 2000
概括
DNA 损伤往往会触发细胞被编程死亡 (细胞亡). 这项研究探讨了为什么DNA损伤会启动细胞亡,细胞死亡的替代方案,以及涉及的信号通路.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
背景情况:
- DNA损伤是一种关键的细胞侮辱.
- 细胞亡 (编程细胞死亡) 是对DNA损伤的常见反应.
- 进行亡的决定是复杂的,涉及整合各种细胞信号.
研究的目的:
- 为了调查DNA损伤引发亡的根本原因.
- 探索DNA受损细胞的替代命运以及影响这些选择的因素.
- 阐明检测DNA损伤和影响亡途径的信号机制.
- 为了检查核细胞组复合体的潜在存在.
- 了解DNA损伤后失败的亡的后果.
主要方法:
- 这项研究主要是理论性的,通过概念分析和现有知识的整合来解决基本问题.
- 它涉及检查与DNA损伤反应和亡相关的信号通路和分子机制.
- 该研究合成了关于细胞内和细胞外刺激影响细胞命运决定的信息.
主要成果:
- DNA损伤启动了亡,作为对潜在有害突变的保护机制.
- 细胞可以根据损伤严重程度和信号传递,在亡和其他命运之间进行选择,例如DNA修复和细胞循环停止.
- 特定的分子信号识别了DNA损伤,并激活了下游的亡效应器.
- 核细胞复合体的存在和功能仍然是需要进一步研究的领域.
- 如果未能启动亡,可能导致基因组不稳定性和癌症等疾病.
结论:
- 细胞亡是防止DNA损伤的关键保障,但替代细胞反应也至关重要.
- 了解在DNA损伤后控制细胞命运决定的复杂信号网络,对于理解细胞健康和疾病至关重要.
- 需要进一步的研究来充分描述核亡机制及其在DNA损伤反应中的作用.
相关概念视频
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...
02:04Fixing Double-strand Breaks
The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
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...
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...
02:04Fixing Double-strand Breaks
The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
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...