需要STAT1来建立但不能维持干扰素γ诱导的转录记忆
Sahar Sh Tehrani1,2, Pawel Mikulski1, Izma Abdul-Zani1
1Department of Biochemistry, University of Oxford, Oxford, UK.
The EMBO journal
|June 5, 2023
概括
人类细胞在暴露于干扰素-amma后发展长期的转录记忆. 这种记忆启动了特定的基因,以便在重新暴露时更快地激活,由STAT1.1介导.
科学领域:
- 免疫学 免疫学 免疫学
- 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:
- 干扰素- (IFNγ) 在人体细胞中诱导一种可逆的,线粒遗传的状态,称为长期转录记忆.
- 酸结合蛋白 (GBP) 基因集群主要是由IFNγ暴露引起的.
研究的目的:
- 研究IFNγ诱导的转录记忆背后的机制,重点关注转录因子STAT1和IRF1.1的作用.
- 为了确定原始细胞在二次IFNγ暴露时如何表现出加速的基因激活.
主要方法:
- 染色体免疫沉试验用于评估转录因子结合动力学.
- 对STAT1激活,核进口和酸化的分析.
- 研究STAT1在建立和维护转录记忆中的作用.
主要成果:
- 在原始细胞中,STAT1和IRF1在IFNγ再暴露时更快地向原始基因促进体的染色质.
- 转录记忆的建立依赖于STAT1,但不需要STAT1的转录激活功能.
- STAT1对于建立记忆至关重要,但对其遗传性至关重要,并且保持了Serine 727酸化.
结论:
- IFNγ诱导的转录记忆是一种STAT1介导的,在初始原始化过程中建立的遗传状态.
- 这种记忆启动了GBP基因,以便在随后的IFNγ暴露后快速结合STAT1和IRF1并加速激活.
- 这些发现揭示了通过表观遗传记忆快速适应免疫反应的新机制.
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