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Elucidation of neurodevelopmental disorder caused by CaMK2 mutant mice

Research Project

Project/Area Number 20K07423
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 49030:Experimental pathology-related
Research InstitutionHamamatsu University School of Medicine

Principal Investigator

Mutoh Hiroki  浜松医科大学, 医学部, 助教 (60443040)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
KeywordsCaMK2β / ヒト疾患モデル動物 / 脳波異常 / 興奮性/抑制性のバランス / 神経発達異常 / 疾患モデル動物
Outline of Research at the Start

小児期難治性てんかん患者の遺伝子解析により、CaMK2βの自己抑制ドメイン異常がてんかんなど神経発達障害の原因になり得ることが分かった。興味深いことに、患者と相同な変異を導入したCaMK2β変異ノックインマウスは、定常状態でガンマ帯域に異様な増強を示す顕著な脳波異常が示した。そこで、本申請では、CaMK2β変異ノックインマウスで生じる脳波異常と興奮性/抑制性バランス異常の関係性を明らかにすることで、神経発達障害モデルマウスの確立と神経回路形成におけるCaMK2βの役割を解明する。

Outline of Final Research Achievements

Mouse models of human disease in which CaMK2β mutations were introduced, identified from patients with neurodevelopmental disorders, showed motor dysfunction and growth retardation similar to patients, and a remarkably decreased expression level of CaMK2β protein in the cerebellum. Furthermore, in the model mice, even a slight decrease in protein expression in the cerebral cortex and hippocampus was found to disrupt the excitatory/inhibitory balance of the neuronal circuitry and produce abnormal EEG. The disruption of the excitatory-inhibitory balance was also found to increase susceptibility to epilepsy. This study successfully established a mouse model of human disease in which CaMK2β mutations were introduced.

Academic Significance and Societal Importance of the Research Achievements

本研究課題の成果により、CaMK2βが神経回路形成における興奮性・抑制性のバランス制御に必要である学術的に重要な発見をした。また、難治性神経疾患の患者より同定した変異を導入したヒト疾患モデルマウスの作出、機能解析することで病態の一端を解明することにも成功し、難治性疾患の病態解明と新たな薬剤開発や治療法につながることが期待される。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (8 results)

All 2023 2022 2021

All Journal Article (5 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 5 results,  Open Access: 2 results) Presentation (3 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Cnpy3 mice reveal neuronal expression of Cnpy3 in the brain2023

    • Author(s)
      Islam Md. Monirul、Mutoh Hiroki、Aoto Kazushi、Belal Hazrat、Saitsu Hirotomo
    • Journal Title

      Journal of Neuroscience Methods

      Volume: 383 Pages: 109730-109730

    • DOI

      10.1016/j.jneumeth.2022.109730

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Elucidation of pathological mechanism caused by human disease mutation in CaMKIIβ2022

    • Author(s)
      Mutoh H, Aoto K, Miyazaki T, Fukuda A, Saitsu H.
    • Journal Title

      Journal of Neuroscience Research

      Volume: 100 Issue: 3 Pages: 880-896

    • DOI

      10.1002/jnr.25013

    • Related Report
      2022 Annual Research Report 2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Generation of Flag/DYKDDDDK Epitope Tag Knock-In Mice Using i-GONAD Enables Detection of Endogenous CaMKIIα and β Proteins2022

    • Author(s)
      Aoto Kazushi、Takabayashi Shuji、Mutoh Hiroki、Saitsu Hirotomo
    • Journal Title

      International Journal of Molecular Sciences

      Volume: 23 Issue: 19 Pages: 11915-11915

    • DOI

      10.3390/ijms231911915

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A boy with biallelic frameshift variants in TTC5 and brain malformation resembling tubulinopathies2021

    • Author(s)
      Miyamoto Sachiko、Kato Mitsuhiro、Sugiyama Kenji、Horiguchi Ryo、Nakashima Mitsuko、Aoto Kazushi、Mutoh Hiroki、Saitsu Hirotomo
    • Journal Title

      Journal of Human Genetics

      Volume: 66 Issue: 12 Pages: 1189-1192

    • DOI

      10.1038/s10038-021-00953-7

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] ATP6V0A1 encoding the a1-subunit of the V0 domain of vacuolar H(+)-ATPases is essential for brain development in humans and mice2021

    • Author(s)
      Aoto K, Kato M, Akita T, Nakashima M, Mutoh H, Akasaka N, Tohyama J, Nomura Y, Hoshino K, Ago Y, Tanaka R, Epstein O, Ben-Haim R, Heyman E, Miyazaki T, Belal H, Takabayashi S, Ohba C, Takata A, Mizuguchi T, Miyatake S, Miyake N, Fukuda A, Matsumoto N and Saitsu H
    • Journal Title

      Nat Commun

      Volume: 12 Issue: 1 Pages: 2107-2107

    • DOI

      10.1038/s41467-021-22389-5

    • Related Report
      2021 Research-status Report 2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] CaMKII βのヒト疾患変異が生じる病態メカニズムの解明2023

    • Author(s)
      武藤弘樹 青戸一司 宮嵜岳大 福田敦夫 才津浩智
    • Organizer
      第100回日本生理学会
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Cnpy3-2xHA マウスは、脳における Cnpy3 の神経特異的発現を明らかにした2023

    • Author(s)
      Md Monirul Islam 武藤弘樹 青戸一司 Hazrat Belal 才津浩智
    • Organizer
      第100回日本生理学会
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 簡便なi-GONAD法によるFlag(DYKDDDDK)タグを挿入したマウスの作製とその有用性2023

    • Author(s)
      青戸 一司 髙林秀次 武藤弘樹 才津浩智
    • Organizer
      第128回日本解剖学会
    • Related Report
      2022 Annual Research Report

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Published: 2020-04-28   Modified: 2024-01-30  

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