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Brain somatic mutations in MTOR reveal translational dysregulations underlying intractable focal epilepsy

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Title
Brain somatic mutations in MTOR reveal translational dysregulations underlying intractable focal epilepsy
Author(s)
Kim, JK; Jun Cho; Kim, SH; Kang, HC; Kim, DS; V. Narry Kim; Lee, JH
Publication Date
2019-10
Journal
JOURNAL OF CLINICAL INVESTIGATION, v.129, no.10, pp.4207 - 4223
Publisher
AMER SOC CLINICAL INVESTIGATION INC
Abstract
Brain somatic mutations confer genomic diversity in the human brain and cause neurodevelopmental disorders. Recently, brain somatic activating mutations in MTOR have been identified as a major etiology of intractable epilepsy in patients with cortical malformations. However, the molecular genetic mechanism of how brain somatic mutations in MTOR cause intractable epilepsy has remained elusive. In this study, translational profiling of intractable epilepsy mouse models with brain somatic mutations and genome-edited cells revealed a novel translational dysregulation mechanism and mTOR activation-sensitive targets mediated by human MTOR mutations that lead to intractable epilepsy with cortical malformation. These mTOR targets were found to be regulated by novel mTOR-responsive 5'-UTR motifs, distinct from known mTOR inhibition-sensitive targets regulated by 5' terminal oligopyrimidine motifs. Novel mTOR target genes were validated in patient brain tissues, and the mTOR downstream effector eIF4E was identified as a new therapeutic target in intractable epilepsy via pharmacological or genetic inhibition. We show that metformin, an FDA-approved eIF4E inhibitor, suppresses intractable epilepsy. Altogether, the present study describes translational dysregulation resulting from brain somatic mutations in MTOR, as well as the pathogenesis and potential therapeutic targets of intractable epilepsy. © 2019, American Society for Clinical Investigation.
URI
https://pr.ibs.re.kr/handle/8788114/6414
ISSN
0021-9738
Appears in Collections:
Center for RNA Research(RNA 연구단) > Journal Papers (저널논문)
Files in This Item:
127032.2-20190923180542-covered-253bed37ca4c1ab43d105aefdf7b5536.pdfDownload

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