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Elucidating mechano-sensing mechanisms by transcriptional machineries

Research Project

Project/Area Number 20K20180
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 90110:Biomedical engineering-related
Research InstitutionKyoto University

Principal Investigator

Maki Koichiro  京都大学, 医生物学研究所, 助教 (90849233)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2022: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywordsバイオメカニクス / DNA / 力学的構造変化 / クロマチン / 一本鎖DNA / 力学計測 / 原子間力顕微鏡 / 生体医工学 / 遺伝子転写 / 1本鎖DNA / DNA損傷-修復 / 細胞老化 / トルク / 転写 / 分子構造変化
Outline of Research at the Start

本研究では,クロマチンに存在するナノ転写装置の構造変化およびDNAのナノスケールの曲率の変化に着目し,それらの細胞・in vitro 再構成により,以下の仮説を検証する.(1)力のもとでナノ転写装置が構造変化する.(2)力のもとでDNAの曲率が変化する。本研究が達成された暁には,機械的な力を利用して細胞の運命決定を行う「メカノジェネティクス」分野の創設,および,機械的な力が老化・がん化に及ぼす影響の解明など,高齢化社会を支えるバイオメカニクス・再生医工学の研究において大きな波及効果が期待される.

Outline of Final Research Achievements

Living tissues change their structure in response to mechanical loading. Cells are known to sense mechanical forces via mechanosensor molecules, but the mechanism by which gene expression is regulated under force remains unclear. In this study, we focused on chromatin in the cell nucleus to understand the effects of conformational changes in chromatin under force on gene expression. We believe that the separation of double-stranded DNA into single-stranded DNA is the key to understanding chromatin-mediated mechanosensing, and successfully constructed an experimental system to observe single-stranded DNA in the cell. In the future, we plan to verify whether mechanical forces in a cell induce the separation of double-stranded DNA into single-stranded DNA.

Academic Significance and Societal Importance of the Research Achievements

本研究では、in situ での一本鎖DNAの観察に世界で初めて成功した。これまで、DNAへの結合性を有した低分子の開発が行われてきたが、細胞内での妥当性の検討がボトルネックとなってきた。本研究では、細胞の semi-intact 化により、核酸への種々の酵素処理を可能とし、開発したイメージング手法における一本鎖DNAの検出の特異性を確認できた。一本鎖DNAと反応するタンパク質群に関して、今後幅広い探索が可能になることから、力のもとで生じるDNAの構造変化を起点としたタンパク質構造体の形成・分解など、細胞の力感知機構を原点的に理解する足掛かりができた。

Report

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

    (11 results)

All 2022 2021 2020 Other

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

  • [Int'l Joint Research] Max Planck Institute/Molecular Biomedicine(ドイツ)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] Helsinki Institute of Life Science(フィンランド)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] Helsinki Institute for Life Science(フィンランド)

    • Related Report
      2020 Research-status Report
  • [Journal Article] Vasculature atrophy causes a stiffened microenvironment that augments epidermal stem cell differentiation in aged skin2022

    • Author(s)
      Ryo Ichijo、Koichiro Maki、Mio Kabata、Teruasa Murata、Arata Nagasaka、Seiichiro Ishihara、Hisashi Haga、Tetsuya Honda、Taiji Adachi、Takuya Yamamoto、Fumiko Toyoshima
    • Journal Title

      Nature Aging

      Volume: 2 Issue: 7 Pages: 592-600

    • DOI

      10.1038/s43587-022-00244-6

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Hydrostatic pressure prevents chondrocyte differentiation through heterochromatin remodeling2020

    • Author(s)
      Maki Koichiro、Nava Michele M.、Villeneuve Clementine、Chang Minki、Furukawa Katsuko S.、Ushida Takashi、Wickstrom Sara A.
    • Journal Title

      Journal of Cell Science

      Volume: 134 Issue: 2 Pages: 247643-247643

    • DOI

      10.1242/jcs.247643

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Fluorescence imaging of underwound DNA in the cell nucleus2022

    • Author(s)
      福手淳平,牧功一郎,安達泰治
    • Organizer
      第60回日本生物物理学会年会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Single-stranded DNA forms condensates surrounding nucleoli2022

    • Author(s)
      牧功一郎, 福手淳平, 安達泰治
    • Organizer
      第60回日本生物物理学会年会
    • Related Report
      2022 Annual Research Report
  • [Presentation] A novel fluorescent technique for single-stranded DNA in cell nucleus: toward understanding biomechanical behaviors of genomic DNA2022

    • Author(s)
      Koichiro Maki, Jumpei Fukute, Takashi Suetake, Taiji Adachi
    • Organizer
      9th World Congress of Biomechanics
    • Related Report
      2022 Annual Research Report 2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 細胞核内における一本鎖 DNA 凝集体のイメージング2022

    • Author(s)
      牧功一郎
    • Organizer
      第34回バイオエンジニアリング講演会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] ATP枯渇条件における細胞核内DNAライブイメージング2021

    • Author(s)
      福手淳平、牧功一郎、安達泰治
    • Organizer
      日本バイオレオロジー学会
    • Related Report
      2020 Research-status Report
  • [Presentation] DNA 超らせん形成が核内クロマチンのアクセシビリティに与える効果2021

    • Author(s)
      福手淳平、牧功一郎、安達泰治
    • Organizer
      日本機械学会 第 31 回バイオフロンティア講演会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2024-12-25  

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