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mRNA-Seq analysis in KCNQ2-related epilepsy model mice and the exploration of novel therapeutic drug candidates for KCNQ2-EE

Research Project

Project/Area Number 19K17347
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 52050:Embryonic medicine and pediatrics-related
Research InstitutionFukuoka University

Principal Investigator

Shibata Mami  福岡大学, 医学部, 助教 (20816392)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
KeywordsKCNQ2 / てんかん / RNA-Seq / トランスクリプトーム / KCNQ2遺伝子変異 / in silicoスクリーニング / in silico スクリーニング / KCNQ2変異
Outline of Research at the Start

早期乳児てんかん性脳症(KCNQ2脳症)は、KCNQ2遺伝子のミスセンス変異に起因する小児難治性てんかんであり、未だ効果的な治療薬はない。
本研究は、KCNQ2脳症の分子病態の解明と治療薬開発の基盤確立を目的とし、KCNQ2脳症モデルマウスの海馬組織を次世代シーケンサーでRNA-Seq解析することで、疾患の病態に関わる分子の発現変化を、mRNAレベルで網羅的に同定する。また、同定された変化を指標としながら、in silicoスクリーニングで選出された化合物の投与実験を行うことで、KCNQ2脳症の新規治療薬候補となる化合物を探索する。

Outline of Final Research Achievements

KCNQ2 gene encodes potassium channel subunits Kv7.2, which form heterotetrameric Kv7.2/Kv7.3 channel with Kv7.3 (encoded by KCNQ3 gene). Kv7.2/Kv7.3 channels are highly expressed in the brain, are enriched at the axonal initial segment, suppressing neuronal excitability. Mutations in KCNQ2 gene commonly cause two types of epilepsy: Self-limited Benign Familial Neonatal Epilepsy (SFNE) and Epileptic Encephalopathy (EE), with the haplo-insufficient and dominant-negative effects on Kv7.2/Kv7.3 channels, respectively. However, in this study, we uncovered that transcriptional patterns of hippocampus were different between SFNE and KCNQ2-EE in model mice, especially of the expression levels of Kcnq2 were less in KCNQ2-EE mice compared with those in control litters, through all postnatal ages. These findings would provide insight into the development of novel therapeutics for KCNQ2-related epilepsy.

Academic Significance and Societal Importance of the Research Achievements

同一遺伝子の変異に起因するSFNEとKCNQ2-EEの重症度の違いは、Kv7.2/Kv7.3チャネルの機能不全レベルに依存すると考えられてきた。本研究では、SFNE、KCNQ2-EE患者の遺伝子変異を保有するモデルマウスを用い、SFNEとKCNQ2-EEの分子病態はmRNAレベルで異なることを明らかにした。この成果はKCNQ2-EEに対する治療薬開発において、核酸治療薬という全く新規の可能性を示すものである。また、本研究ではSFNE、KCNQ2-EEモデルマウスのてんかんに関する表現形、その重症度の違いを明らかにしたことから、これらモデルマウスのKCNQ2-EE創薬開発への有用性を確立した。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (9 results)

All 2021 2020 2019

All Journal Article (4 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 4 results,  Open Access: 4 results) Presentation (5 results) (of which Int'l Joint Research: 3 results)

  • [Journal Article] Impaired neuronal activity and differential gene expression in STXBP1 encephalopathy patient iPSC-derived GABAergic neurons2021

    • Author(s)
      Ichise Eisuke、Chiyonobu Tomohiro、Ishikawa Mitsuru、Tanaka Yasuyoshi、Shibata Mami、Tozawa Takenori、Taura Yoshihiro、Yamashita Satoshi、Yoshida Michiko、Morimoto Masafumi、Higurashi Norimichi、Yamamoto Toshiyuki、Okano Hideyuki、Hirose Shinichi
    • Journal Title

      Human Molecular Genetics

      Volume: - Issue: 14 Pages: 1337-1348

    • DOI

      10.1093/hmg/ddab113

    • Related Report
      2021 Annual Research Report 2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Comparative characterization of PCDH19 missense and truncating variants in PCDH19-related epilepsy2020

    • Author(s)
      Shibata Mami、Ishii Atsushi、Goto Ayako、Hirose Shinichi
    • Journal Title

      Journal of Human Genetics

      Volume: 66 Issue: 6 Pages: 569-578

    • DOI

      10.1038/s10038-020-00880-z

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Application of induced pluripotent stem cells in epilepsy2020

    • Author(s)
      Hirose Shinichi、Tanaka Yasuyoshi、Shibata Mami、Kimura Yuichi、Ishikawa Mitsuru、Higurashi Norimichi、Yamamoto Toshiyuki、Ichise Eisuke、Chiyonobu Tomohiro、Ishii Atsushi
    • Journal Title

      Molecular and Cellular Neuroscience

      Volume: 108 Pages: 103535-103535

    • DOI

      10.1016/j.mcn.2020.103535

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Characteristics of KCNQ2 variants causing either benign neonatal epilepsy or developmental and epileptic encephalopathy2019

    • Author(s)
      Goto Ayako、Ishii Atsushi、Shibata Mami、Ihara Yukiko、Cooper Edward C.、Hirose Shinichi
    • Journal Title

      Epilepsia

      Volume: 60 Issue: 9 Pages: 1870-1880

    • DOI

      10.1111/epi.16314

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] PCDH19関連てんかんにおける遺伝子型ー表現型の関係性解析2021

    • Author(s)
      柴田磨己, 石井敦士, 後藤綾子, 廣瀬伸一
    • Organizer
      日本小児神経学会学術集会
    • Related Report
      2021 Annual Research Report
  • [Presentation] PCDH19関連てんかんにおける遺伝子型-表現型の関係性解析2021

    • Author(s)
      柴田磨己, 石井敦士, 後藤綾子, 廣瀬伸一.
    • Organizer
      日本小児神経学会学術集会
    • Related Report
      2020 Research-status Report
  • [Presentation] Comparative characterization of PCDH19 missense and truncating variations in PCDH19-related epilepsy.2020

    • Author(s)
      Mami Shibata, Atsushi Ishii, Ayako Goto, Shinichi Hirose.
    • Organizer
      International Symposium on the Pathophysiology of Developmental and Epileptic Encephalopathy.
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Comparative characterization of PCDH19 missense and truncating variations in PCDH19-related epilepsy2020

    • Author(s)
      Mami Shibata, Atsushi Ishii, Ayako Goto, Shinichi Hirose
    • Organizer
      International Symposium on the Pathophysiology of Developmental and Epileptic Encephalopathy
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Developmental transcriptome alterations in the hippocampus of mice harboring a Kcnq2 mutation2019

    • Author(s)
      Mami Shibata, Masanobu Deshimaru, Atsushi Ishii, Shinichi Hirose
    • Organizer
      Asian Oceanian Congress of Child Neurology
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2023-01-30  

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