Tet2通过mRNA氧化促进病原体感染诱导的骨髓形成
Qicong Shen1, Qian Zhang1,2, Yang Shi3
1National Key Laboratory of Medical Immunology & Institute of Immunology, Second Military Medical University, Shanghai 200433, China.
Nature
|January 25, 2018
概括
通过减少mRNA中的5-甲基细胞素 (5-mC),Tet2促进感染诱导的骨髓形成,通过Adar1影响Socs3的表达. 这揭示了Tet2在哺乳动物免疫力中的新型表谱作用.
科学领域:
- 字体转录学
- 免疫学
- 分子生物学
背景情况:
- 包含RNA修饰的表达体在转录后调节基因表达.
- 哺乳动物mRNA中的5-Methylcytosine (5-mC) 及其功能在很大程度上仍未被描述.
- 十个转位 (Tet) 蛋白质,特别是Tet2,已知用于DNA脱甲基化,并在炎症和骨髓性恶性瘤中发挥作用.
研究的目的:
- 阐明哺乳动物mRNA中的5-甲基细胞素 (5-mC) 的作用和机制.
- 研究Tet2在感染引起的骨髓形成中的作用.
- 通过Tet2确定Socs3表达的表达学调节.
主要方法:
- 与mRNA修饰有关的Tet2的酶活性分析.
- 研究Tet2,Adar1和Socs3mRNA之间的相互作用.
- 在感染模型 (败血症,寄生虫) 中研究 Tet2 缺乏对骨髓形成和 mRNA 甲基化模式的影响.
主要成果:
- 通过降低Socs3mRNA水平,Tet2促进了感染诱导的骨髓形成和巨细胞扩张.
- 通过独立于RNA编辑的Adar1介导的Socs3mRNA的不稳定,Tet2抑制了Socs3的表达.
- Tet2 中介于mRNA中5-mC的氧化,而 Tet2 缺乏导致mRNA中5-mC的增加,影响Adar1结合.
结论:
- 通过减少mRNA中的5-mCs,Tet2在促进哺乳动物骨髓形成方面发挥着至关重要的表体转录作用.
- 通过Tet2介导的mRNA甲基化影响了双链RNA的形成和Adar1的结合,揭示了新的生理功能.
- 这项研究揭示了一种新型的调节途径,涉及Tet2,表体转录和天生的免疫力.
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