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DCTN1 binds to TDP-43 and regulates TDP-43 aggregation

Research Project

Project/Area Number 20K22663
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0702:Biology at cellular to organismal levels, and related fields
Research InstitutionFukuoka University

Principal Investigator

Kawada Junichi  福岡大学, 医学部, 助教 (00312207)

Project Period (FY) 2020-09-11 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywordsダイナクチン / ダイニン / TDP-43 / Perry病 / 細胞内輸送 / タンパク質凝集体 / モデルマウス / Perry症候群 / 凝集体
Outline of Research at the Start

TDP-43は、種々の神経変性疾患で見られる凝集体の主要成分である。核に存在するべきTDP-43を核外で凝集させる病的機構は不明である。私共は、ダイナクチン1 (DCTN1;ダイニンモータ制御複合体の最大サブユニットで、Perry症候群の原因遺伝子産物)が、TDP-43と相互作用することを見出した。本研究では、DCTN1-TDP-43相互作用の特性と意義を明らかにする。Perry症候群で、この相互作用の異常がTDP-43輸送系を破綻させ、細胞質内凝集体形成を促進する仮説を証明する。更に、DCTN1変異によるTDP-43凝集の仕組みから出発し、種々の神経変性疾患に共通な発症機構の解明を目指す。

Outline of Final Research Achievements

A major hallmark of several neurodegenerative diseases, including ALS, is cytoplasmic aggregation of TDP-43. Perry disease is a type of TDP-43 proteinopathy. The causative gene DCTN1 encodes the largest subunit of the dynactin complex. Dynactin binds to cytoplasmic dynein and regulates dynein-mediated retrograde transport. Perry disease-linked missense mutations (e.g. p.G71A) impair microtubule-binding abilities of DCTN1. However, how DCTN1 mutations cause TDP-43 proteinopathy remains unclear. We found that DCTN1 bound to TDP-43. Biochemical analysis using DCTN1 mutants revealed that the DCTN1 CAP-Gly-basic domain, dynactin domain, and C-terminal region bound to TDP-43. Remarkably, the p.G71A mutation affected TDP-43-interacting ability of DCTN1. Overexpression of DCTN1G71A induced cytoplasmic aggregation of TDP-43. We thus identified DCTN1 as a new player in TDP-43 transport, providing insights into the pathological mechanisms of Perry disease and other TDP-43 proteinopathies.

Academic Significance and Societal Importance of the Research Achievements

TDP-43は、ALSをはじめとする複数の神経変性疾患で見られる異常凝集体の主成分である。本来は核に存在するべきTDP-43を細胞質内で凝集させる病的仕組みは、未解明のままである。我々は、DCTN1(ダイニンと呼ばれるモータータンパク質の運動性を制御するアダプター分子であり、Perry病の原因遺伝子産物)が、TDP-43に結合することを見出した。更に、DCTN1-TDP-43結合の制御異常により、細胞質内凝集体が形成される仕組みの一端を明らかにした。この仕組みが、ALSなどの発症に広く関与する可能性がある。

Report

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

    (6 results)

All 2021 Other

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

  • [Int'l Joint Research] The Scripps Research Institute(米国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] The Scripps Research Institute(米国)

    • Related Report
      2020 Research-status Report
  • [Journal Article] DCTN1 Binds to TDP-43 and Regulates TDP-43 Aggregation2021

    • Author(s)
      Deshimaru M, Kinoshita-Kawada M, Kubota K, Watanabe T, Tanaka Y, Hirano S, Ishidate F, Hiramoto M, Ishikawa M, Uehara Y, Okano H, Hirose S, Fujioka S, Iwasaki K, Yuasa-Kawada J, Mishima T, Tsuboi Y
    • Journal Title

      Int J Mol Sci

      Volume: 22 Issue: 8 Pages: 3985-3985

    • DOI

      10.3390/ijms22083985

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Behavioral profile in a Dctn1 G71A knock-in mouse model of Perry disease2021

    • Author(s)
      Deshimaru M, Mishima T, Watanabe T, Kubota K, Hosoi M, Kinoshita-Kawada M, Yuasa-Kawada J, Ikeda M, Mori M, Murata Y, Abe T, Enjoji M, Kiyonari H, Kodama S, Fujioka S, Iwasaki K, Tsuboi Y
    • Journal Title

      Neurosci Lett

      Volume: 764 Pages: 136234-136234

    • DOI

      10.1016/j.neulet.2021.136234

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] DCTN1 binds to TDP-43 and regulates TDP-43 aggregation2021

    • Author(s)
      Deshimaru, M., Kinoshita-Kawada, M. Kubota, K., Watanabe, T., Tanaka, Y., Hirano, S., Ishidate, F., Hiramoto, M., Ishikawa, M., Uehara, Y., Okano, H., Hirose, S., Fujioka, S., Iwasaki, K., Yuasa-Kawada, J., Mishima, T. and Tsuboi, Y.
    • Journal Title

      International Journal of Molecular Sciences

      Volume: 22 Pages: 3985-3985

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Unveiling link between TDP-43 and dynactin: lessons from Perry disease2021

    • Author(s)
      Yoshio Tsuboi, Takayasu Mishima, Junichi Kawada
    • Organizer
      第63回日本神経学会学術大会
    • Related Report
      2021 Annual Research Report
    • Invited

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Published: 2020-09-29   Modified: 2023-01-30  

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