异质拼接模式由KIF5A变异产生的,与肌缩性侧面硬化症相关
Megan G Pino1,2,3, Kelly A Rich1, Nicholas J Hall1,2
1Department of Neurology, The Ohio State University Wexner Medical Center, Columbus, OH 43210, United States.
Human molecular genetics
|August 18, 2023
概括
在KIF5A中单核酸变体通过损害运动神经元蛋白质水平,导致轴突运输缺陷,导致肌缩性侧面硬化症 (ALS). 这项研究阐明了这些KIF5A变异在ALS病变发生过程中的拼接效应.
科学领域:
- 神经科学是一个神经科学.
- 遗传学 遗传学 是一个
- 分子生物学分子生物学
背景情况:
- 在Kinesin家族成员5A (KIF5A) 中的单核酸变体 (SNV) 与肌缩侧面硬化症 (ALS) 有关.
- 在神经元中,KIF5A对前进轴突运输至关重要.
- 与ALS相关的KIF5ASNVs通常位于27号外因子附近,可能会影响拼接和C端货物结合域.
研究的目的:
- 为了研究KIF5ASNVs在第27个外体附近的精确拼接结果.
- 为了确定该地区的所有SNV是否会导致exon跳转.
- 为了阐明KIF5ASNVs对运动神经元功能和生存的下游影响.
主要方法:
- 在HEK293细胞中进行了体外小基因拼接试验.
- 在CRISPR编辑的人类干细胞衍生的运动神经元中进行拼接分析.
- 在KIF5A 5'ss SNV敲入小鼠模型中进行剪接和病理学评估.
- 在不同细胞系中量化KIF5AmRNA和蛋白质水平.
主要成果:
- 只有5'拼接位 (5'ss) 的SNV,而不是3'拼接位的SNV,诱导了exon 27跳转.
- 无论是5ss和3ss SNV,以及截断的KIF5A变体,都严重降低了运动神经元的存活率,并导致了形态缺陷.
- 虽然KIF5AmRNA水平保持稳定,但KIF5A蛋白水平在变体系中降低,表明蛋白质合成或稳定性受损.
结论:
- KIF5A SNVs对RNA剪接具有异质的影响,但汇聚以减少KIF5A蛋白质的可用性.
- 减少KIF5A蛋白导致ALS的轴突运输缺陷和运动神经元病理.
- 这项研究澄清了ALS中KIF5ASNVs的致病机制,突出了蛋白质水平调节失调,而不仅仅是拼接.
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