无意义介导的mRNA衰变因子SMG9缺乏对斑马鱼过早衰老的影响
Shaohong Lai1, Hiroshi Shiraishi1, Wulan Apridita Sebastian2
1Department of Cell Biology, Oita University Faculty of Medicine, Yufu, Oita, Japan.
Communications biology
|May 28, 2024
概括
无意中介的mRNA衰变 (NMD) 蛋白质SMG9缺乏导致斑马鱼的过早衰老和心脏/大脑缺陷. 这与由高精氨酸氧化酶 (SMOX) 引起的氧化应激增加有关.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 发展生物学 发展生物学
背景情况:
- SMG9对于无意义介导的mRNA衰变 (NMD),细胞质量控制途径至关重要.
- SMG9的突变与心脏和大脑形综合征 (HBMS) 有关,但机制尚不清楚.
研究的目的:
- 为了研究成年斑马鱼体内SMG9的体内功能.
- 阐明SMG9相关HBMS和过早衰老背后的分子机制.
主要方法:
- 生成并分析了具有延长寿命的smg9突变斑马鱼 (smg9oi7/oi7).
- 在突变斑马鱼中评估先天性异常,心脏功能和衰老表型.
- 量化NMD目标mRNA水平和精氨酸氧化酶 (SMOX) 表达.
主要成果:
- smg9突变斑马鱼表现出先天性脑部异常,心脏收缩减少,以及过早衰老的表型.
- 在突变者中观察到增加NMD目标mRNA水平的趋势.
- 突变物中的高SMOX导致反应性氧物种和烯蛋白的积累,导致氧化应激.
结论:
- 缺少SMG9导致NMD失调,导致SMOX积累和氧化应激.
- 这种氧化应激有助于在smg9突变斑马鱼中观察到的过早衰老表型.
- 这些发现为HBMS的分子基础和SMG9在衰老中的作用提供了洞察力.
相关概念视频
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Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
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