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Analyses of cortical actin dynamics by live-cell imaging and machine-learning

Research Project

Project/Area Number 19K22422
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 44:Biology at cellular to organismal levels, and related fields
Research InstitutionKyoto University

Principal Investigator

Yoshimura Shigehiro  京都大学, 生命科学研究科, 准教授 (90346106)

Co-Investigator(Kenkyū-buntansha) 本田 直樹  京都大学, 生命科学研究科, 准教授 (30515581)
Project Period (FY) 2019-06-28 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2020: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2019: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Keywordsアクチン / 原子間力顕微鏡 / 表層骨格 / シグナル伝達 / 機械学習 / 高速原子間力顕微鏡 / 表層アクチン / 細胞骨格 / ライブセルイメージング / アクチン骨格
Outline of Research at the Start

がん細胞の中には、細胞表層骨格の制御シグナルに異常を持つものが多い。その原因解明には骨格の分子構造の動的変化に関する解析が必要であるが、電子顕微鏡や蛍光顕微鏡などの従来の観察技術では容易ではない。本研究代表者はこれまでに、生細胞観察に特化した高速原子間力顕微鏡を開発し、表層骨格線維の動態を数秒の時間分解能で可視化するという世界で唯一の技術を確立した。本研究課題では、この膨大な連続画像とシグナル分子の活性情報という多次元・多変数の画像データを、機械学習により統合することで、、ヒトの認知能力の限界を超える新たなデータ解析法の確立する。そして、がんと細胞骨格との新たな関係性を見いだすことを目指す。

Outline of Final Research Achievements

We established the method to extract spatio-temporal information of individual actin filaments from a series of images obtained from a living cultured cell by high-speed atomic force microscopy (HS-AFM), and to use it as an input data set for the machine learning. We first made a stochastic generative model at individual regions in the target image, which carries vector information of an actin filament as a latent variable, and successfully predicted the location and the direction of the actin filament. We applied this technique to a series of HS-AFM images obtained from a living cell surface and found an uneven distribution of the filaments angle. We also combined correlative imaging of HS-AFM and fluorescence microscopy with optogenetic tool to obtain input data set under the control of Rho activities. We use these data sets as training data for the machine learning and will extract the properties of actin network in different signaling states.

Academic Significance and Societal Importance of the Research Achievements

これまでの画像解析技術では、高速原子間力顕微鏡により得られた連続画像から、各アクチン線維の時空間的情報を自動抽出するのは極めて困難であった。本研究課題で確立した画像解析技術は、様々なクオリティーの連続画像から自動かつ高いS/N比でアクチン線維の時空間的情報を抽出することが可能であり、機械学習に用いる大量の学習データを取得するのに貢献するのみならず、これまで未報告であった表層アクチン動態の解明を可能にするものである。このデータを機械学習に入力することで、従来の人の手による画像解析では発見不可能であった細胞の状態変化(がん、細胞死等)を、早期に見つける技術の確立がより現実的になると期待される。

Report

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

    (14 results)

All 2020 2019 Other

All Int'l Joint Research (4 results) Journal Article (5 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 5 results,  Open Access: 4 results) Presentation (5 results) (of which Int'l Joint Research: 2 results,  Invited: 3 results)

  • [Int'l Joint Research] マドリード大学(スペイン)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] マックスプランク研究所/ヨーロッパ分子生物研究所(ドイツ)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] カリフォルニア州立大学サンディエゴ校/ハーワードヒューズ医学研究所(米国)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] European Molecular Biology Laboratory(ドイツ)

    • Related Report
      2019 Research-status Report
  • [Journal Article] Viral RNA recognition by LGP2 and MDA5, and activation of signaling through step-by-step conformational changes2020

    • Author(s)
      Duic Ivana、Tadakuma Hisashi、Harada Yoshie、Yamaue Ryo、Deguchi Katashi、Suzuki Yuki、Yoshimura Shige H、Kato Hiroki、Takeyasu Kunio、Fujita Takashi
    • Journal Title

      Nucleic Acids Research

      Volume: 48 Issue: 20 Pages: 11664-11674

    • DOI

      10.1093/nar/gkaa935

    • NAID

      120006936359

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] High cell density increases glioblastoma cell viability under glucose deprivation via degradation of the cystine/glutamate transporter xCT (SLC7A11)2020

    • Author(s)
      Yamaguchi Itsuki、Yoshimura Shige H.、Katoh Hironori
    • Journal Title

      Journal of Biological Chemistry

      Volume: 295 Issue: 20 Pages: 6936-6945

    • DOI

      10.1074/jbc.ra119.012213

    • NAID

      120006867156

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Redox-Sensitive Cysteines Confer Proximal Control of the Molecular Crowding Barrier in the Nuclear Pore2020

    • Author(s)
      Zhang Wanzhen、Watanabe Ryuji、Konishi Hide A.、Fujiwara Takahiro、Yoshimura Shige H.、Kumeta Masahiro
    • Journal Title

      Cell Reports

      Volume: 33 Issue: 11 Pages: 108484-108484

    • DOI

      10.1016/j.celrep.2020.108484

    • NAID

      120006940267

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Quantitative proteomics indicate a strong correlation of mitotic phospho-/dephosphorylation with non-structured regions of substrates.2019

    • Author(s)
      H. Yamazaki, H. Kosako and S.H. Yoshimura
    • Journal Title

      Biochim. Biophys. Acta. Proteins Proteom.

      Volume: 1968 Issue: 1 Pages: 140295-140295

    • DOI

      10.1016/j.bbapap.2019.140295

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Interactions between non-structured domains of FG- and non FG-nucleoporins coordinate the ordered assembly of the nuclear pore complex in mitosis2019

    • Author(s)
      H.A. Konishi and *S.H. Yoshimura
    • Journal Title

      FASEB J.

      Volume: 34 Issue: 1 Pages: 1532-1545

    • DOI

      10.1096/fj.201901669r

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Live-cell analysis of protein-mediated membrane deformation during clathrin-mediated endocytosis by High-speed atomic force microscopy2020

    • Author(s)
      吉村成弘
    • Organizer
      日本顕微鏡学会学術講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] ライブセル高速原子間力顕微鏡による細胞表層骨格の可視化とメカノセンシング機構の解明2020

    • Author(s)
      吉村成弘
    • Organizer
      日本生体医工学会
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] In vivo dynamics of the cortical actin network revealed by fast-scanning atomic force microscopy.2019

    • Author(s)
      ZHANG Y, YOSHIDA A, SAKAI N, UEKUSA Y, KUMETA M, YOSHIMURA SH
    • Organizer
      第75回日本顕微鏡学会学術講演会
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] Protein-induced morphological changes of the plasma membrane during clathrin-mediated endocytosis and its dependency on the membrane tension revealed by live-cell fast-scanning atomic force microscopy.2019

    • Author(s)
      YOSHIMURA SH
    • Organizer
      EMBO workshop, Physics and Chemistry of Endocytosis
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] How Clathrin-mediated Endocytosis Proceeds under Membrane Tension.2019

    • Author(s)
      YOSHIMURA S,H.
    • Organizer
      International Symposium on AMED “Mechanobiology”Project
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited

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Published: 2019-07-04   Modified: 2022-01-27  

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