MEF2B C端突变增强了转录活性和稳定性,推动了B细胞淋巴发育
Chuanjiang Yu1, Qiong Shen1, Antony B Holmes1
1Institute for Cancer Genetics, Columbia University, New York, NY, USA.
Nature communications
|August 23, 2024
概括
肌细胞增强因子2B (MEF2B) 转录因子的突变破坏其C尾酸化,增强其活性和稳定性. 这导致生殖中心B细胞淋巴瘤的发展.
科学领域:
- 分子生物学分子生物学
- 癌症生物学 癌症生物学
- 遗传学 遗传学 是一个
背景情况:
- 肌细胞增强因子2B (MEF2B) 是一种转录因子,在生殖中心 (GC) 衍生的B细胞淋巴瘤中经常发生变化.
- 虽然N-终端MEF2B突变在淋巴发育中的作用已知,但C-终端突变的功能不明.
研究的目的:
- 为了研究与淋巴瘤相关联的MEF2B中carboxy (C) -终端突变的功能后果.
- 阐明MEF2B酸化在调节其与染色质重塑复合物的相互作用和蛋白质稳定性方面的作用.
主要方法:
- 对MEF2B C尾的酸化位点分析.
- 评估MEF2B突变物与SWI/SNF染色体重塑复合物和CUL3/KLHL12无素复合物的相互作用.
- 在体内研究中,使用表达酸化缺乏MEF2B突变的小鼠与Bcl2转基因小鼠交叉.
主要成果:
- 淋巴瘤相关的MEF2B突变损害了血清324 (S324) 的生理酸化.
- 缺乏S324酸化增强了MEF2B与SWI/SNF复合物的相互作用,增加了转录活性.
- 突变MEF2B表现出增加的蛋白质稳定性,这是由于与CUL3/KLHL12泛素复合物的相互作用减少.
- 具有酸化缺陷MEF2B突变的小鼠在与Bcl2过度表达相结合时显示GC扩大,并发展GC衍生的淋巴瘤.
结论:
- 融合机制将多种MEF2B突变与失调和生殖中心B细胞淋巴发育联系起来.
- 损伤的C尾酸化是推动MEF2B介导淋巴发育的关键机制.
- 通过改变酸化和蛋白质稳定性的MEF2B调节障碍对B细胞淋巴瘤的发展作出了重大贡献.
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