GATOR1 突变 损害 PI3 激酶依赖生长因子 信号 调节 mTORC1 的调节
Maéline Muller1, Jasmine Bélanger1, Imane Hadj-Aissa1
1Department of Psychiatry and Neuroscience, CERVO Brain Research Centre, Université Laval, Quebec City, QC G1J 2G3, Canada.
与相关的NPRL2突变破坏了GATOR1复合体,导致无法控制的mTORC1信号传递. 这损害了细胞对营养和生长因子信号的反应,为病的发病过程提供了洞察力.
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:
- 根据氨基酸的可用性,GATOR1复合物调节mTORC1的信号传递.
- 在GATOR1子单元 (NPRL2,NPRL3,DEPDC5) 中的突变与人类有关.
- 这些突变对GATOR1功能和mTORC1调节的确切影响尚不清楚.
研究的目的:
- 研究相关的NPRL2突变对GATOR1复合组合和mTORC1信号传递的影响.
- 确定这些突变如何影响mTORC1调节,以响应氨基酸可用性和生长因子信号.
- 阐明细胞过程中GATOR1复合体中断的功能后果.
主要方法:
- 局部定向的突变发生产生NPRL2相关突变 (L105P,T110S,D214H).
- 细胞培养实验评估mTORC1活动,蛋白质-蛋白质相互作用和复杂组合.
- 对氨基酸剥夺,增长因子撤销和PI3K抑制的细胞反应的分析.
- 西方涂抹和免疫光检测用于评估蛋白质水平,信号通路和TFEB局部化.
主要成果:
- 与相关的NPRL2突变 (L105P,T110S,D214H) 增加了基底mTORC1信号传递.
- NPRL2-L105P突变通过破坏与NPRL3和DEPDC5的相互作用,损害了GATOR1复合组合,导致构成性mtORC1活动.
- GATOR1复合体对于抑制mTORC1在增长因子退出或PI3K抑制的反应中至关重要.
- 缺乏功能性GATOR1的细胞对PI3K依赖的mTORC1抑制具有抗性,导致持续的翻译和改变TFEB核定位.
结论:
- 与相关的NPRL2突变可以破坏GATOR1复合组合,导致异常的mtORC1信号传递.
- 这些突变损害了mTORC1通过氨基酸和生长因子通路的正常调节.
- 这些发现提供了GATOR1功能障碍,mTORC1失调和病原体之间的分子联系.
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