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由tRNA合成酶突变引起的tRNA过度表达拯救了外围神经病变

Amila Zuko¹, Moushami Mallik^1,2, Robin Thompson³

¹Department of Molecular Neurobiology, Donders Institute for Brain, Cognition and Behaviour and Faculty of Science, Radboud University, Nijmegen, Netherlands.

Science (New York, N.Y.)

|September 13, 2021

概括

查科特-玛丽-图斯 (CMT) 突变糖基-tRNA合成酶封存转移RNA (tRNA) ^Gly,影响蛋白质合成. 增加tRNA^Gly水平可以治疗这种外围神经病变.

科学领域:

分子生物学
神经遗传学
细胞生物学

背景情况:

查科-玛丽-牙 (CMT) 是一组遗传的外围神经病.
在tRNA合成酶基因中的异构基因突变与CMT有关.
突变tRNA合成酶导致CMT的确切机制尚不清楚.

研究的目的:

阐明由糖基-tRNA合成酶突变引起的CMT的分子机制.
调查tRNA封存在CMT发病过程中的作用.
探索CMT2D的潜在治疗策略.

主要方法:

在CMT模型中研究了糖基-tRNA合成酶和tRNA^Gly相互作用.
分析了蛋白质合成,核糖体停滞和综合应激反应 (ISR) 激活.
在Drosophila和小鼠模型中利用了tRNA^Gly的转基因过度表达.
评估了GTPBP2失活对外围神经病变的影响.

主要成果:

CMT突变的糖基-tRNA合成酶结合但不释放tRNA^Gly,导致其绑定.
tRNA^Gly封存导致核糖体停滞在甘氨酸密码子和运动神经元中的ISR激活.
在CMT2D模型中,tRNA^Gly的过度表达改善了蛋白质合成缺陷,神经病变和ISR激活.
GTPBP2的失活使周围神经病变恶化.

结论:

提出了CMT2D的分子机制,其中包括tRNA^Gly封存和随后的蛋白质合成抑制.
提升tRNA^Gly水平代表了CMT2D的潜在治疗途径.
这些发现强调了平衡的氨基酸tRNA平衡在神经元健康中的关键作用.

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