缺氧导致线粒细胞核基因表达的减少和人类细胞中mtDNA转录暂停的增加
Noam Shtolz1, Sarah Dadon1, Dan Mishmar2
1Department of Life Sciences, Ben-Gurion University of the Negev, Beer Sheva, Israel.
Communications biology
|January 8, 2026
概括
在缺氧期间,线粒体协调线粒体和核DNA的基因表达. 这种协调减少线粒细胞核基因表达 (MNGE) 对于在压力下线粒体功能至关重要.
科学领域:
- 细胞生物学 细胞生物学
- 分子遗传学 分子遗传学
- 线粒体生物学 线粒体生物学
背景情况:
- 线粒体对于细胞能量生产至关重要,并对环境压力做出反应.
- 在压力期间,线粒体DNA (mtDNA) 和核DNA (nDNA) 基因表达之间的协调尚未得到充分理解.
- 缺氧 (低氧) 是一个重要的压力因素,影响细胞功能.
研究的目的:
- 在低氧条件下研究人类细胞中线核基因表达 (MNGE) 的协调调节.
- 阐明缺氧诱导因子1-α (HIF1α) 在调节MNGE中的作用.
- 在压力期间识别控制mtDNA基因表达的机制.
主要方法:
- 在低氧条件下,在18个人类细胞系中进行RNA测序 (RNA-seq).
- 测量 mtDNA 拷贝数量. 测量 mtDNA 拷贝数量.
- 低氧诱导因子1-alpha (HIF1α) ChIP测序和淘汰赛研究.
- 新生RNA测序 (PRO-seq) 用于分析转录性暂停.
主要成果:
- 从mtDNA和nDNA的氧化酸化 (OXPHOS) 基因表达的协调减少在大多数细胞系中都被观察到.
- 低氧诱导的MNGE减少主要发生在RNA水平,而不是由于mtDNA拷贝数的变化.
- HIF1α 影响 mtDNA 基因表达,其缺失会破坏 MNGE 的协调.
- 在缺氧时,转录暂停在mtDNA中显著增加,这表明了调节作用.
结论:
- 协调减少MNGE是细胞对缺氧反应的关键特征.
- 在压力下,HIF1α在协调线核基因表达方面发挥作用.
- 对mtDNA的转录暂停是压力期间线粒体基因表达的关键调节机制.
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