脱氧基氨酸合成酶突变改变了5A真核细胞启动因子的翻译后修饰,导致人类和小鼠神经平衡受损
Leah R Padgett1, Mollie R Shinkle2, Spencer Rosario3
1Indiana Biosciences Research Institute, Indianapolis, IN 46202, USA.
HGG advances
|June 19, 2023
概括
脱氧基氨酸合成酶 (DHPS) 缺乏通过破坏mRNA翻译来损害大脑发育. 这项研究揭示了DHPS变异如何影响eIF5A修饰,影响神经元功能,并可能导致发育障碍.
科学领域:
- 遗传学和分子生物学
- 神经科学是一个神经科学.
- 罕见疾病 罕见疾病
背景情况:
- 脱氧基氨酸合成酶 (DHPS) 缺乏症是一种罕见的遗传疾病.
- 在mRNA翻译中,DHPS酶对于激活真核细胞启动因子5A (eIF5A) 是至关重要的.
- DHPS中的突变与神经发育问题有关,例如智力障碍和发作.
研究的目的:
- 研究DHPS突变影响神经发育的分子机制.
- 了解DHPS变异对eIF5A修饰和mRNA翻译的功能影响.
主要方法:
- 生成患者衍生的淋巴细胞细胞系与DHPS变体.
- 创建了一个小鼠模型,具有特定于大脑的Dhps删除.
- 分析了DHPS蛋白水平,酶活性和eIF5A翻译后修饰 (乙化和低化).
- 评估对神经元发育中的mRNA翻译和蛋白质表达的影响.
主要成果:
- 人类的DHPS变种降低了DHPS蛋白质的丰富性,并损害了酶的功能.
- DHPS变体改变了eIF5A的修饰,增加了核eIF5A-乙化和减少了细胞质eIF5A-低化.
- 在小鼠中失去大脑DHPS会损害eIF5A-hypusination-dependent mRNA的翻译.
- 在小鼠模型中观察到改变了影响神经元发育和功能的蛋白质表达.
结论:
- 缺少DHPS会通过受损的eIF5A-依赖的mRNA翻译来破坏神经元功能.
- 这项研究为DHPS缺乏的分子基础及其对神经发育的影响提供了关键的见解.
- 这些发现为开发这种罕见遗传疾病的治疗策略提供了基础.
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