由DNA损伤引起的p53通过一个涉及miR-34a和FOXP1的负反循环降低RAG1的表达
Katarina Ochodnicka-Mackovicova1, Martine van Keimpema1, Marcel Spaargaren2
1Department of Pathology, Amsterdam University Medical Centers, Location AMC, University of Amsterdam, Amsterdam, The Netherlands; Lymphoma and Myeloma Center Amsterdam (LYMMCARE), Amsterdam, The Netherlands.
The Journal of biological chemistry
|October 25, 2024
概括
DNA损伤触发了p53介导的反循环,该循环会降低B细胞发育中的重组激活基因1 (RAG1) 的下调. 这一过程涉及microRNA-34a,在V(D) J重组过程中保护基因组稳定性.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 重组激活基因1和2 (RAG1/2) 对于前B细胞中的V(D) J重组是必不可少的.
- RAG1/2的失调与B细胞恶性瘤有关.
- 在DNA损伤压力下控制RAG1/2的机制尚未完全理解.
研究的目的:
- 研究在经历DNA损伤的B细胞前RAG1/2的调节机制.
- 阐明p53及其下游效应因子在控制RAG1/2活动中的作用.
主要方法:
- 在DNA损伤条件下对B细胞前的RAG1/2表达的分析.
- 对p53信号通路的研究,包括动脉动脉突变 (ATM) 激活和微RNA-34a (miR-34a) 调制.
- 评估分叉箱P1 (FOXP1) 的下游效应器.
- 使用p53缺乏和miR-34a贫乏的B前细胞的研究.
主要成果:
- 由DNA损伤引起的p53激活启动了一个负反循环,该循环下调RAG1.1.
- 这个循环涉及ATM,p53稳定和miR-34a,FOXP1作为下游的效应器.
- 缺少p53或耗尽miR-34a导致RAG1/2上调和Ig轻链重组在B细胞前的增加.
结论:
- 一个p53/miR-34a/FOXP1介导的负反循环在DNA断裂时迅速降低B细胞前的RAG.
- 这种调节机制限制了RAG-依赖的DNA损伤,在V(D) J重组过程中保护了基因组稳定性.
相关概念视频
Abnormal Proliferation
4.5K
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...
4.5K
Negative Regulator Molecules
35.2K
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.
35.2K
DNA Damage can Stall the Cell Cycle
9.1K
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...
9.1K
Nucleotide Excision Repair
3.4K
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...
3.4K
Interactions Between Signaling Pathways
6.2K
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...
6.2K
Overview of DNA Repair
30.6K
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...
30.6K


