氧化素1保护核基因组免受氧化损伤
Takashi Furusawa1, Vaibhavi Gujar1, Shalu Sharma2
1Developmental Therapeutics Branch, NCI Center for Cancer Research, National Cancer Institute, National Institutes of Health, 37 Convent Drive, Bethesda, MD 20892, USA.
bioRxiv : the preprint server for biology
|November 26, 2025
概括
过氧化素1 (PRDX1) 缺乏导致基因组不稳定性,通过损害核糖体生物发生和核细胞完整性. 丢失PRDX1激活了DNA损伤反应,促进了二次DNA结构,影响了核糖体DNA转录.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 细胞生物学 细胞生物学
背景情况:
- 氧化素1 (PRDX1) 是一种关键的抗氧化酶,参与氧化还原信号传递.
- PRDX1-null小鼠显示基因组不稳定性和加速瘤发生,但潜在的机制尚不清楚.
- 了解PRDX1的作用对于理解基因组稳定性和癌症发展至关重要.
研究的目的:
- 阐明PRDX1缺乏导致基因组不稳定性的分子机制.
- 研究PRDX1损失对核细胞功能和核糖体生物发生的影响.
- 为了识别核细胞中PRDX1缺陷激活的特定DNA损伤反应途径.
主要方法:
- 对PRDX1-null小鼠模型的分析.
- 核细胞形态和RNA聚合酶I (POL-I) 依赖转录的评估.
- 对二次DNA结构稳定性的评估 (RNA-DNA杂交,G-四重复DNA).
- 对rRNA水平和处理的研究.
- 检测DNA损伤反应激活 (ATM,TCOF1,MRN复合体).
主要成果:
- 缺少PRDX1会改变细胞核形态,并影响前核糖体RNA的POL-I依赖转录.
- 氧化应激诱导的核细胞功能障碍促进了二级DNA结构的稳定性,导致基因组的不稳定性.
- 失去PRDX1会降低新生的rRNA水平,并损害rRNA处理,影响核糖体生物发生.
- 缺少PRDX1会触发核细胞DNA损伤反应,包括ATM激活和NBS1对rDNA位置的招募.
- NBS1积累与抑制的rDNA转录相关,可能保护核细胞基因组.
结论:
- PRDX1对于维持核细胞完整性和核糖体生物发生是必不可少的.
- 通过PRDX1对rDNA转录和处理的氧依赖调节对于基因组稳定性至关重要.
- 缺少PRDX1激活了核细胞DNA损伤反应,突出了它在防止氧化应激诱导的基因组损伤方面的作用.
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