相关实验视频
Updated: Sep 11, 2025

14:57
Yeast As a Chassis for Developing Functional Assays to Study Human P53
Published on: August 4, 2019
9.6K
53BP1调节了p53-E2F7依赖的转录基因抑制,并参与了Fanconi贫血路径
Yundong Fu1, Wei Wu1, Maosha Zhang1
1Department of Gastrointestinal Surgery, Medical Research Institute, Zhongnan Hospital of Wuhan University, Wuhan University, Wuhan 430071, P.R. China; Frontier Science Center for Immunology and Metabolism, Medical Research Institute, Wuhan University, Wuhan, P.R. China.
Cell reports
|August 14, 2025
概括
结合p53的蛋白1 (53BP1) 在未受到压力的细胞中负面调节E2F7的表达. 这种依赖H4K20me2的调节影响了Fanconi贫血路径和DNA交叉链接的敏感性.
科学领域:
- 分子生物学分子生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 对DNA损伤的反应反应
背景情况:
- p53结合蛋白1 (53BP1) 通过H4K20me2在损伤部位的积累对DNA修复至关重要.
- 53BP1在未受压力细胞中的基因转录调节中的作用仍然在很大程度上未被探索.
研究的目的:
- 调查53BP1在调节非压力细胞中的基因转录中的功能.
- 阐明53BP1影响E2F7表达的机制及其下游影响.
主要方法:
- 53BP1的消耗和E2F7表达的评估.
- 对53BP1与E2F7转录起点 (TSSs) 结合的分析.
- 研究E2F7 TSS的表观遗传修饰及其对p53结合的影响.
主要成果:
- 53BP1的枯竭导致了E2F7.7的p53依赖上调.
- 53BP1以H4K20me2依赖的方式与E2F7 TSS结合,通过表观遗传变化调节p53结合.
- 53BP1的枯竭抑制了E2F7的目标基因,包括Fanconi贫血 (FA) 途径中的基因,导致对DNA交叉链接的过敏.
结论:
- 53BP1作为p53-E2F7轴的负调节器.
- H4K20me2介导的53BP1结合在E2F7 TSS影响基因表达和细胞对DNA损伤的反应.
- 这项研究揭示了53BP1在调节FA通路的新型作用,独立于其正规DNA修复功能.
相关概念视频
Abnormal Proliferation
4.6K
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
4.6K
Negative Regulator Molecules
35.9K
Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
35.9K
DNA Damage can Stall the Cell Cycle
9.3K
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...
9.3K
Master Transcription Regulators
7.0K
Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
7.0K
Covalently Linked Protein Regulators
7.2K
Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein....
These groups modify specific amino acids in a protein....
7.2K
Interactions Between Signaling Pathways
6.4K
Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
6.4K

