在裂变酵母中调节rDNA阵列形态的调节者
Alexandria J Cockrell1,2, Jeffrey J Lange1, Christopher Wood1
1Stowers Institute for Medical Research, Kansas City, Missouri, United States of America.
PLoS genetics
|July 5, 2024
概括
研究人员开发了GapR-GFP来可视化酵母菌中的核糖体DNA (rDNA) 阵列空间组织. 大量的核糖体蛋白基因缺失改变了rDNA组织,并赋予了对TOR抑制的抵抗力,这表明了补偿性核糖体生物生成途径.
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 是一个遗传学.
背景情况:
- 核细胞形态是核糖体生物发生的关键指标.
- 核糖体DNA (rDNA) 形态的调节对核糖体产生至关重要,但研究不足.
- rDNA基因转录显著影响核糖体输出.
研究的目的:
- 为了研究rDNA阵列形态和核糖体生物发生活动之间的关系.
- 建立一个实时视觉标记,用于对rDNA组织进行定量分析.
- 确定影响rDNA形态和核糖体生产的遗传因素.
主要方法:
- 开发了GapR-GFP,这是一个用于转录诱导过度扭曲DNA的光标记.
- 在Schizosaccharomyces pombe中对rDNA阵列空间组织进行实时成像和定量分析.
- 删除突变集合的查,以确定影响rDNA组织的基因.
主要成果:
- rDNA阵列的空间组织是动态的,受细胞周期,葡萄糖饥饿,RNA pol I抑制和TOR激活的影响.
- 大型核糖体蛋白 (RPL) 基因的删除改变了rDNA的组织.
- RPL基因删除突变体对TOR抑制剂Torin1表现出耐药性,涉及MAPK Pmk1.1等途径.
结论:
- 在RPL删除突变体中改变的rDNA形态表明了补偿性核糖体生物发生变化.
- 多个信号通路有助于补偿反应.
- 这些发现可能有助于理解人类疾病,如核糖体病.
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