希斯 H3.3 陪伴者 HIRA 在获得的耐受性中使应激反应基因准备好应对潜在的致命压力
Yoshikazu Nagagaki1, Yuji Kozakura1, Theventhiran Mahandaran1
1Department of Gene Mechanisms, Graduate School of Biostudies, Kyoto University, Kyoto, Japan.
概括
通过激活保护基因,基因组伴侣HIRA使细胞能够通过激活保护基因来培养对热应激的获得耐受性. 这一发现揭示了HIRA作为细胞应激反应和生存的关键调节者.
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:
- 有机体需要适应环境挑战的适应性反应才能生存.
- 荷尔梅斯,或从低剂量压力中增加细胞适应性,是一种已知的现象.
- 细胞对低剂量压力的反应背后的分子机制尚未完全理解.
研究的目的:
- 为了研究获得的应力耐受性的分子机制.
- 确定参与细胞应激适应的关键调节者.
- 为了阐明质子变异H3.3伴侣HIRA在应激反应中的作用.
主要方法:
- 研究了HIRA在人类细胞中获得的热应激耐受性中的作用.
- 分析了组素H3.3的沉积及其对应激基因 (例如HSP70) 的影响.
- 检查了与基因激活相关的染色质修饰 (H3 Lys-4三甲基化,H3 Lys-9乙化).
- 在纤维细胞和HeLa细胞中减弱HIRA,以评估其对获得耐受性的影响.
主要成果:
- HIRA对于获得了对致命热应激的耐受性至关重要.
- HIRA沉积了组素H3.3,激活了像HSP70.0.这样的应激反应基因.
- 激活的基因显示出活性色素标记 (H3 Lys-4三甲基化和H3 Lys-9乙化).
- 在两种细胞类型中,HIRA耗尽显著损害了获得的耐受性.
结论:
- HIRA是适应性应激反应的关键调节者.
- 通过通过基因素H3.3沉积调节基因表达,HIRA促进获得的耐受性.
- 这项研究揭示了HIRA作为细胞应激耐受性和适应环境变化的主调节者.
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