一个修改通过mTORC1信号调节HSC维护和自我更新
Hongna Zuo1, Aiwei Wu1, Mingwei Wang1
1Zhejiang Key Laboratory of Medical Epigenetics, School of Basic Medical Sciences, The Third People's Hospital of Deqing, Department of Cardiology, Affiliated Hospital of Hangzhou Normal University, Hangzhou Normal University, Hangzhou, 311121, China.
Nature communications
|July 8, 2024
概括
TRMT6蛋白通过控制蛋白质翻译来调节造血干细胞 (HSC) 功能. 删除TRMT6通过激活mTORC1信号来破坏HSC的自我更新,突出显示HSC恒温的新机制.
科学领域:
- 血液学 血液学 血液学
- 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.
背景情况:
- 造血干细胞 (HSC) 需要精确的蛋白质翻译控制,以终身生产血液和适应压力.
- 管理HSC蛋白转化调节的精确机制仍然不完全理解.
研究的目的:
- 调查tRNA m1A58"编写器"蛋白TRMT6和TRMT61A在HSC功能和平衡中所起的作用.
- 阐明TRMT6-TRMT61A复杂介导的tRNA修饰调节HSCs的机制.
主要方法:
- 在HSC中删除Trmt6.
- 竞争性移植测试以评估HSC的自我更新.
- 单细胞RNA-seq分析以分析基因表达.
- m1A-tRNA-seq和西布洛特用于分析tRNA修饰和蛋白质表达.
- 药理上抑制mTORC1通路的作用.
主要成果:
- 通过异常的mTORC1信号激活,Trmt6的删除导致了HSC扩散的增加.
- 缺乏TRMT6的HSC显示自身更新能力受损.
- 单细胞RNA-seq在缺乏Trmt6.6的HSC中发现了上调的mTORC1信号.
- TRMT6促进tRNA m1A58的修饰和TSC1的表达,微调mTORC1的活动.
- 抑制mTORC1在TRMT6缺乏的HSC中挽救了功能缺陷.
结论:
- TRMT6-TRMT61A复合体调解tRNA-m1A58的修饰,这对于调节HSC平衡至关重要.
- 这项研究揭示了一种新的机制,通过mTORC1信号,将tRNA修饰与HSC功能联系起来.
- TRMT6在维持HSC自我更新和防止异常扩散方面发挥着至关重要的作用.
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