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通过METTL3介导的染色质接触,通过衰老过程中的代谢重编程促进应力颗粒相分离
Chen Wang1, Hideki Tanizawa2,3, Connor Hill4
1Department of Experimental Therapeutics, University of Texas M.D. Anderson Cancer Center, Houston, TX, 77030, USA.
Nature communications
|June 26, 2024
概括
甲基转移酶复合体 (METTL3) 协调基因表达和染色质结构,以控制细胞衰老. 这涉及代谢重编程和相分离,影响细胞周期mRNA转化.
科学领域:
- 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.
- 细胞生物学 细胞生物学
背景情况:
- METTL3是甲基转移酶复合体的催化子单元,介导m6基因表达调节的修饰.
- 此外,METTL3还通过改变染色体结构来独立于其酶活性来调节转录.
- 这些METTL3双重功能之间的协调仍然没有特征.
研究的目的:
- 阐明甲基转移酶复合物如何协调其酶活性依赖和酶活性独立的功能.
- 研究METTL3在调节细胞衰老中的作用.
主要方法:
- 在衰老过程中对三维染色体组织和基因表达的分析.
- 研究代谢重编程和液体-液体相分离.
- 对细胞周期相关的mRNAs的翻译调节的评估.
主要成果:
- 在衰老过程中,METTL3介导的染色体循环通过3D染色体组织诱导Hexokinase 2的表达.
- 升高的hexokinase 2促进了液体-液体相分离和代谢重编程.
- 观察到细胞周期mRNAs的翻译受损,具有聚甲基化m6A位点.
结论:
- 甲基转移酶复合物协调m6A-依赖和A-独立的功能,以调节细胞衰老.
- 这种协调通过METTL3诱导的染色体组织,代谢重编程和相分离来实现.
- 这些发现揭示了一种新的机制,该机制将表观遗传修饰,染色质结构和衰老期间的细胞命运联系起来.
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