• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Regulatory mechanisms of synaptic transmission by an epilepsy-causative ligand-receptor complex

Research Project

Project/Area Number 17K14969
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Neurochemistry/Neuropharmacology
Research InstitutionNational Institute for Physiological Sciences

Principal Investigator

Norihiko Yokoi  生理学研究所, 分子細胞生理研究領域, 助教 (50710969)

Project Period (FY) 2017-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2018: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2017: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywordsてんかん / シナプス伝達 / 蛋白質複合体 / リン酸化 / 蛋白質合成 / ナノドメイン/ナノカラム / トランスシナプス / 結晶構造 / AMPA受容体 / PSD-95
Outline of Final Research Achievements

Balance between excitation and inhibition in neural circuits is finely tuned, and upsetting this delicate balance can cause epilepsy. Mutations in the human gene LGI1, encoding a neuronal secreted protein, cause a familial epilepsy. Previously we reported that a secretion-defective LGI1 mutant does not fold correctly and prematurely degrade, and a secretable mutant is selectively defective in binding to one of its receptors, ADAM22 (Yokoi et al. Nat Med 2015). Here we found that another secretable LGI1 R474Q mutant binds to ADAM22, but the mutation disrupts the LGI1-LGI1 homomeric dimerization in the mouse brain. This result revealed the novel pathogenic molecular mechanisms to cause epilepsy (Yamagata, Miyazaki, Yokoi et al, Nat Commun 2018).

Academic Significance and Societal Importance of the Research Achievements

てんかんはけいれんや記憶喪失、幻聴などが伴う頻度の高い脳疾患である。現在用いられている抗てんかん薬の多くが、興奮性シナプス伝達の抑制、または抑制性シナプス伝達の亢進を戦略とするが、非特異的な作用による副作用の可能性が問題になっており、特異的な作用点を持つ、副作用の少ない抗てんかん薬への社会的な要求は非常に高い。一方、遺伝学的、免疫学的知見からLGI1が脳の興奮性を制御する鍵であることが強く示唆されている。本研究ではLGI1の変異を原因とする、新たなてんかんの分子病態を明らかにした。この成果は新たなてんかん治療法の開発に向けて、重要な知見を与えると期待される。

Report

(3 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • Research Products

    (10 results)

All 2019 2018 2017 Other

All Journal Article (6 results) (of which Peer Reviewed: 6 results,  Open Access: 1 results,  Acknowledgement Compliant: 1 results) Presentation (3 results) (of which Int'l Joint Research: 2 results) Remarks (1 results)

  • [Journal Article] Systematic Screening of Depalmitoylating Enzymes and Evaluation of Their Activities by the Acyl-PEGyl Exchange Gel-Shift (APEGS) Assay2019

    • Author(s)
      Takashi Kanadome、Norihiko Yokoi、Yuko Fukata、Masaki Fukata
    • Journal Title

      Methods in Molecular Biology

      Volume: 印刷中

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Deleted in colorectal cancer (netrin-1 receptor) antibodies and limbic encephalitis in a cat with hippocampal necrosis2019

    • Author(s)
      Daisuke Hasegawa、Yumi Ohnishi、Eiji Koyama、Satoru Matsunaga、Shouhei Ohtani、Akio Nakanishi、Takanori Shiga、James K. Chambers、Kazuyuki Uchida、Norihiko Yokoi、Yuko Fukata、Masaki Fukata
    • Journal Title

      Journal of Veterinary Internal Medicine

      Volume: 印刷中

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Structural basis of epilepsy-related ligand-receptor complex LGI1-ADAM222018

    • Author(s)
      Yamagata Atsushi、Miyazaki Yuri、Yokoi Norihiko、Shigematsu Hideki、Sato Yusuke、Goto-Ito Sakurako、Maeda Asami、Goto Teppei、Sanbo Makoto、Hirabayashi Masumi、Shirouzu Mikako、Fukata Yuko、Fukata Masaki、Fukai Shuya
    • Journal Title

      Nature Communications

      Volume: 9 Issue: 1 Pages: 1546-1546

    • DOI

      10.1038/s41467-018-03947-w

    • Related Report
      2018 Annual Research Report 2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Long-term clinical follow-up of a patient with non-paraneoplastic cerebellar ataxia associated with anti-mGluR1 autoantibodies2018

    • Author(s)
      Yoshikura Nobuaki、Kimura Akio、Fukata Masaki、Fukata Yuko、Yokoi Norihiko、Harada Naoko、Hayashi Yuichi、Inuzuka Takashi、Shimohata Takayoshi
    • Journal Title

      Journal of Neuroimmunology

      Volume: 319 Pages: 63-67

    • DOI

      10.1016/j.jneuroim.2018.04.001

    • Related Report
      2018 Annual Research Report 2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Neurobiology of autoimmune encephalitis.2018

    • Author(s)
      Fukata M, Yokoi N, Fukata Y.
    • Journal Title

      Curr Opin Neurobiol

      Volume: 48 Pages: 1-8

    • DOI

      10.1016/j.conb.2017.07.012

    • Related Report
      2018 Annual Research Report 2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] The LGI1-ADAM22 protein complex in synaptic transmission and synaptic disorders2017

    • Author(s)
      Fukata Y, Yokoi N, Miyazaki Y, Fukata M
    • Journal Title

      Neurosci Res

      Volume: 116 Pages: 39-45

    • DOI

      10.1016/j.neures.2016.09.011

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Presentation] Identification of PSD-95 depalmitoylating enzymes and profiling of the palmitoylation stoichiometry of synaptic proteins2017

    • Author(s)
      Yokoi N, Fukata Y, Sekiya A, Murakami T, Kobayashi K, Fukata M.
    • Organizer
      The 40th annual meeting of the Japan Neuroscience Society
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Molecular Mechanisms of a Familial Epilepsy Caused by Mutations of a Neuronal Secreted Protein, LGI12017

    • Author(s)
      Yokoi N, Fukata Y, Fukata M.
    • Organizer
      Yonsei-Korea-NIPS Symposium
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] PSD-95脱パルミトイル化酵素の同定、及び蛋白質パルミトイル化の定量的解析法の開発2017

    • Author(s)
      横井紀彦
    • Organizer
      第6回 生理研-霊長研-脳研 合同シンポジウム
    • Related Report
      2017 Research-status Report
  • [Remarks] てんかんの原因タンパク質が神経細胞間の橋渡しをする仕組みを解明

    • URL

      http://www.nips.ac.jp/release/2018/04/post_363.html

    • Related Report
      2018 Annual Research Report 2017 Research-status Report

URL: 

Published: 2017-04-28   Modified: 2020-03-30  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi