Expression of the Neuronal tRNA n-Tr20 Regulates Synaptic Transmission and Seizure Susceptibility.

Expression of the Neuronal tRNA n-Tr20 Regulates Synaptic Transmission and Seizure Susceptibility.
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神经元tRNA n-Tr 20的表达调节突触传递和癫痫易感性

DOI:
10.1016/j.neuron.2020.07.023
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发表时间:
2020-10-14
期刊:
影响因子:
16.2
通讯作者:
Ackerman SL
Ackerman SL
中科院分区:
医学1区
文献类型:
--
作者:
Kapur M;Ganguly A;Nagy G;Adamson SI;Chuang JH;Frankel WN;Ackerman SL

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哺乳动物基因组有数百个核编码的tRNA,但单个tRNA基因对细胞和生物体功能的贡献仍然未知。在这里,我们证明了突变的神经富集精氨酸tRNA,n-Tr 20,增加癫痫发作阈值和改变突触传递。n-Tr 20的表达也调节了由Gabrg 2(一种编码GABAA受体亚基的基因)中的癫痫连锁突变引起的癫痫发作。n-Tr 20的缺失通过激活整合的应激反应和抑制mTOR信号传导改变翻译起始,后者可能有助于突变小鼠中神经传递的改变。高度表达的异亮氨酸tRNA的缺失同样改变了大脑中的这些信号通路,这表明翻译起始的调节是对tRNA丢失的保守反应。我们的数据表明,一个tRNA家族的单个成员的丢失会导致多种细胞表型,突出了tRNA突变的致病潜力。
The mammalian genome has hundreds of nuclear-encoded tRNAs, but the contribution of individual tRNA genes to cellular and organismal function remains unknown. Here, we demonstrate that mutations in a neuronally enriched arginine tRNA, n-Tr20, increased seizure threshold and altered synaptic transmission. n-Tr20 expression also modulated seizures caused by an epilepsy-linked mutation in Gabrg2, a gene encoding a GABAA receptor subunit. Loss of n-Tr20 altered translation initiation by activating the integrated stress response and suppressing mTOR signaling, the latter of which may contribute to altered neurotransmission in mutant mice. Deletion of a highly expressed isoleucine tRNA similarly altered these signaling pathways in the brain, suggesting that regulation of translation initiation is a conserved response to tRNA loss. Our data indicate that loss of a single member of a tRNA family results in multiple cellular phenotypes, highlighting the disease-causing potential of tRNA mutations.
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