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Reserch to dicover disease pathogenesis of distal hereditary motor neuropathy

Research Project

Project/Area Number 22K19506
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 52:General internal medicine and related fields
Research InstitutionNagoya University

Principal Investigator

Iguchi Yohei  名古屋大学, 医学部附属病院, 講師 (80790659)

Co-Investigator(Kenkyū-buntansha) 勝野 雅央  名古屋大学, 医学系研究科, 教授 (50402566)
佐橋 健太郎  名古屋大学, 医学系研究科, 准教授 (90710103)
横井 聡  名古屋大学, 医学系研究科, 特任助教 (30815460)
Project Period (FY) 2022-06-30 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2023: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2022: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords遠位型遺伝性運動ニューロパチー / SLC5A7 / ノックインマウス / 声帯麻痺 / コリントランスポーター / ALS
Outline of Research at the Start

研究代表者らは若年発症で四肢遠位筋優位に進行性の筋力低下と四肢腱反射亢進を認めるALS家系の遺伝子解析から、SLC5A7のC末端の新規欠失変異 (F502fs10) を同定した 。SLC5A7は神経筋接合部のシナプス前終末でコリンの再取り込みを担う分子であるが、SLC5A7のC末端の欠失変異が筋無力症ではなく遠位型運動ニューロパチーを生じる病態機序は解明されていない。本研究課題ではdHMN-Ⅶの病態を解明し病態抑止療法を開発することを目的とする。また、本疾患はALSと病態を共有する一面があり本研究によりALSの新規病態の解明と治療法開発に繋がる可能性がある。

Outline of Final Research Achievements

Distal hereditary motor neuropathy (dHMN) is an inherited disorder with progressive distal-dominant lower motor neuron deficits. We identified a novel truncation mutation at the C-terminus of SLC5A7 by genetic analysis of a family history of progressive muscle weakness in the distal muscles of the extremities. Cultured cell experiments confirmed that a specific region at the SLC5A7 C-terminus is essential for intracellular trafficking. We also analyzed Slc5a7 mutation knock-in (Slc5a7KI) mice. We confirmed that they develop progressive motor deficits: axonal degeneration was observed in the anterior root of the lumbar spinal cord in Slc5a7KI/KI mice. In contrast, Slc5a7KI/+ mice showed denervation at the neuromuscular junction of the distal leg muscle. Slc5a7KI mice may serve as a animal model for the pathogenesis of dHMN-VII.

Academic Significance and Societal Importance of the Research Achievements

遠位型遺伝性運動ニューロパチー (dHMN) は四肢遠位優位の下位運動ニューロン障害による筋萎縮を進行性に認める遺伝性疾患である。SLC5A7のC末端欠失ヘテロ接合変異がdHMN-Ⅶの原因遺伝子として同定されている。SLC5A7は神経筋接合部のシナプス前終末でコリンの再取り込みを担う分子であり、SLC5A7の膜貫通ドメインのホモ接合点変異は常染色体劣性の先天性筋無力症候群を生じる。SLC5A7のC末端欠失変異が運動ニューロパチーを生じる機序は解明されていない。本研究の結果はdHMN-Ⅶの病態解明につながる成果であり治療法開発への応用も期待される。

Report

(3 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • Research Products

    (15 results)

All 2024 2023 2022 Other

All Journal Article (7 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 7 results,  Open Access: 7 results) Presentation (7 results) (of which Int'l Joint Research: 1 results,  Invited: 2 results) Remarks (1 results)

  • [Journal Article] Autoantibodies Against Dihydrolipoamide S-Acetyltransferase in Immune-Mediated Neuropathies.2024

    • Author(s)
      Fukami Y, Iijima M, Koike H, Yagi S, Furukawa S, Mouri N, Ouchida J, Murakami A, Iida M, Yokoi S, Hashizume A, Iguchi Y, Imagama S, Katsuno M.
    • Journal Title

      Neurol Neuroimmunol Neuroinflamm.

      Volume: 11(2) Issue: 2

    • DOI

      10.1212/nxi.0000000000200199

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] IκB kinase phosphorylates cytoplasmic TDP-43 and promotes its proteasome degradation2024

    • Author(s)
      Iguchi Yohei、Takahashi Yuhei、Li Jiayi、Araki Kunihiko、Amakusa Yoshinobu、Kawakami Yu、Kobayashi Kenta、Yokoi Satoshi、Katsuno Masahisa
    • Journal Title

      Journal of Cell Biology

      Volume: 223 Issue: 2

    • DOI

      10.1083/jcb.202302048

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Monomerization of TDP-43 is a key determinant for inducing TDP-43 pathology in amyotrophic lateral sclerosis2023

    • Author(s)
      Oiwa Kotaro、Watanabe Seiji、Onodera Kazunari、Iguchi Yohei、Kinoshita Yukako、Komine Okiru、Sobue Akira、Okada Yohei、Katsuno Masahisa、Yamanaka Koji
    • Journal Title

      Science Advances

      Volume: 9 Issue: 31

    • DOI

      10.1126/sciadv.adf6895

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Mitochondria-associated membrane collapse impairs TBK1-mediated proteostatic stress response in ALS2023

    • Author(s)
      Watanabe Seiji、Murata Yuri、Oka Yasuyoshi、Oiwa Kotaro、Horiuchi Mai、Iguchi Yohei、Komine Okiru、Sobue Akira、Katsuno Masahisa、Ogi Tomoo、Yamanaka Koji
    • Journal Title

      Proceedings of the National Academy of Sciences

      Volume: 120 Issue: 47

    • DOI

      10.1073/pnas.2315347120

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Neutrophil extracellular traps: from antimicrobial innate immunity to the development of chemotherapy-induced peripheral neuropathy2023

    • Author(s)
      Koike Haruki、Iguchi Yohei、Sahashi Kentaro、Katsuno Masahisa
    • Journal Title

      eBioMedicine

      Volume: 90 Pages: 104526-104526

    • DOI

      10.1016/j.ebiom.2023.104526

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Actin-binding protein filamin-A drives tau aggregation and contributes to progressive supranuclear palsy pathology2022

    • Author(s)
      Tsujikawa K,Hamanaka K, Riku Y, Hattori Y, Hara N, Iguchi Y,Miyata T, Sobue G, Matsumoto N, Sahashi K, Katsuno M, et al.
    • Journal Title

      Sci Adv

      Volume: - Issue: 21 Pages: 1-16

    • DOI

      10.1126/sciadv.abm5029

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Impaired disassembly of the axon initial segment restricts mitochondrial entry into damaged axons.2022

    • Author(s)
      Kiryu-Seo S, Matsushita R, Tashiro R, Yoshimura T, Iguchi Y, Katsuno M, Ryosuke Takahashi R, Kiyama H
    • Journal Title

      EMBO J

      Volume: 41 Issue: 20

    • DOI

      10.15252/embj.2021110486

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Unveiling a novel role of phosphorylation of TDP-432023

    • Author(s)
      Yohei Iguchi
    • Organizer
      第64回日本神経学会学術大会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Dysregulated endocannabinoid system is a therapeutic target for amyotrophic lateral sclerosis2023

    • Author(s)
      伊藤 大輔, 橋詰 淳, 井口 洋平, 山田 晋一郎, 岸本 祥之, 小森 祥太, 飯田 円, 勝野 雅央
    • Organizer
      第64回日本神経学会学術大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] A novel reporter, TDP-DiLuc, detects TDP-43 monomerization preceding TDP-43 pathology2023

    • Author(s)
      大岩 康太郎, 渡邊 征爾, 小野寺 一成, 井口 洋平, 岡田 洋平, 勝野 雅央, 山中 宏二
    • Organizer
      第64回日本神経学会学術大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Research to understand and overcome ALS2023

    • Author(s)
      Yohei Iguchi
    • Organizer
      The 1st Fujita International Symposium on Brain Science
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Monomerization of TDP-43 is a key determinant for inducing TDP-43 pathology in ALS2022

    • Author(s)
      大岩 康太郎, 渡邊 征爾, 小野寺 一成, 井口 洋平, 岡田 洋平, 勝野 雅央, 山中 宏二
    • Organizer
      第63回日本神経学会学術大会
    • Related Report
      2022 Research-status Report
  • [Presentation] Dysregulated endocannabinoid metabolism is a therapeutic target for amyotrophic lateral sclerosis2022

    • Author(s)
      伊藤 大輔, 橋詰 淳, 山田 晋一郎, 井口 洋平, 岸本 祥之, 鳥居 良太, 飯田 円, 勝野 雅央
    • Organizer
      第63回日本神経学会学術大会
    • Related Report
      2022 Research-status Report
  • [Presentation] Analysis of visual abnormalities in synucleinopathy2022

    • Author(s)
      天草 善信, 井口 洋平, 横井 聡, 川上 裕, 勝野 雅央
    • Organizer
      第63回日本神経学会学術大会
    • Related Report
      2022 Research-status Report
  • [Remarks] IKKβは筋萎縮性側索硬化症(ALS)の原因タンパク質TDP-43 の凝集を選択的に抑制する

    • URL

      https://www.nagoya-u.ac.jp/researchinfo/result/2024/01/ikkalstdp-43.html

    • Related Report
      2023 Annual Research Report

URL: 

Published: 2022-07-05   Modified: 2025-01-30  

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