相关实验视频
Updated: Sep 17, 2025

14:57
Yeast As a Chassis for Developing Functional Assays to Study Human P53
Published on: August 4, 2019
9.7K
解码p53基因的促进子活动的刺激特异性调节
Flavia Vigliotti1, Nicolai Engelmann2, Mark Sinzger-D'Angelo2
1Systems Biology of the Stress Response, Department of Biology, Technical University Darmstadt, Darmstadt, Germany.
Frontiers in cell and developmental biology
|June 30, 2025
概括
瘤抑制剂p53通过动态,随机爆发来调节基因表达,以应对DNA损伤. 它的转录活性取决于促进体切换速率,而不仅仅是p53水平,揭示了细胞反应的复杂控制.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 细胞生物学 细胞生物学
背景情况:
- 瘤抑制剂p53对基因组完整性至关重要,通过调节参与亡,细胞循环停止和DNA修复的基因来应对细胞压力.
- 基因转录本质上是随机的,其特点是活动爆发和促进体切换,导致基因表达的细胞间变异.
- 了解p53动态如何在各种DNA损伤条件下转化为特定的基因调节模式,对于理解细胞反应至关重要.
研究的目的:
- 为了研究刺激依赖的p53动态如何转化为特定的基因调节模式后各种DNA损伤.
- 通过使用先进的成像技术,量化单细胞和单分子水平的目标基因促进活性.
- 为分析随机基因表达数据和推断调控参数开发一个计算框架.
主要方法:
- 诱导各种类型的DNA损伤 (电离辐射,紫外线辐射,化疗药物).
- 单分子光在位杂交 (smFISH) 用于量化促进体活性.
- 贝叶斯推理框架用于分析随机基因表达参数.
主要成果:
- 特定于刺激的p53介导基因表达模式根据目标基因和DNA损伤类型/程度进行差异调节.
- 随机基因表达主要由促进体激活和失活率控制.
- 转录活动往往与总p53水平或DNA结合的部分脱,表明多维调节.
结论:
- 在转录调节中p53的作用是复杂的和多维的,超出了简单的度依赖效应.
- 刺激特异性促进体切换动态是将p53激活转化为对DNA损伤的独特细胞反应的关键.
- 这项研究为p53介导的基因调节对DNA损伤的反应的随机性提供了新的见解.
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
Epigenetic Regulation
3.1K
Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
X-chromosome...
3.1K
Negative Regulator Molecules
36.1K
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.
36.1K
Interactions Between Signaling Pathways
6.6K
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...
6.6K
Master Transcription Regulators
7.1K
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...
7.1K
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

