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Studies on understanding the mechanism for collective behavioral transitions

Research Project

Project/Area Number 21H02532
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 45010:Genetics-related
Research InstitutionHiroshima University

Principal Investigator

Takuma Sugi  広島大学, 統合生命科学研究科(理), 准教授 (70571305)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000)
Fiscal Year 2023: ¥9,880,000 (Direct Cost: ¥7,600,000、Indirect Cost: ¥2,280,000)
Fiscal Year 2022: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2021: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Keywords線虫 / 集団行動 / 状態転移 / 線虫C. elegans / 神経回路
Outline of Research at the Start

行動遺伝学分野では古くから1個体レベルを対象に行動と遺伝子の関係について解析がなされてきた. 一方, 自然界では個体は単独で存在するとともに, 他の個体と相互作用し自己組織的に集団で生存・繁殖を可能にする現象にありふれ, 一部は創発現象として多くの人を魅了する. しかし集団レベルの行動が遺伝子や神経系とどのように関連づけられるかについては未解明な点が多い. 本研究では行動遺伝学的手法と独自のイメージング技術により, 集団と単独時における線虫の分子神経機構の違いを比較解析し, 集団の静から動への状態転移機構を解明することを目的とする.

Outline of Final Research Achievements

In this study, I found that the orderly pattern collapses in response to increased humidity, and eventually the majority of the nematodes form aggregates that have ceased to move. Subsequent observation of this agglomeration revealed that the nematode population did not resume movement in a disorderly manner, but instead shifted simultaneously to a state of movement within a few seconds. This transition of the entire population from static to dynamic is a phenomenon of self-organization on a time axis that is often observed in nature, such as the threatening behavior of honeybees (shimmering) against an external enemy or the flapping of wings of a flock of birds from the water surface against an external enemy. In these cases, the population as a whole is usually known to be close to a critical state in which it is likely to respond to external stimuli. Thus, we have clarified a part of the molecular neural mechanism of this state transition in this study.

Academic Significance and Societal Importance of the Research Achievements

集団の振る舞いが最も多様かつ複雑で魅力的な個体集団レベルでは、行動遺伝学的解析が可能なモデル動物の集団の実験系に乏しく、秩序生成機構の理解を妨げてきた。ランダムに振る舞うミクロな要素は、相互作用して自己組織的にマクロな秩序を生み出すことにより単独の要素とは異なる振る舞いを示す。これまで自己組織化メカニズムに関しては、拡散する情報伝達因子に焦点が当てられてきた。しかし多様かつ複雑な個体集団の自己組織的現象については未解明な点が多く、自然科学の多くの分野に共通する核心的な問いであることから、本研究は波及効果は高いと考えられる。

Report

(2 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • Research Products

    (4 results)

All 2023

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (2 results) (of which Invited: 2 results)

  • [Journal Article] Caenorhabditis elegans transfers across a gap under an electric field as dispersal behavior2023

    • Author(s)
      Chiba Takuya、Okumura Etsuko、Nishigami Yukinori、Nakagaki Toshiyuki、Sugi Takuma、Sato Katsuhiko
    • Journal Title

      Current Biology

      Volume: 33 Issue: 13 Pages: 2668-2677.e3

    • DOI

      10.1016/j.cub.2023.05.042

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] The Large-Scale Cultivation of Nematodes to Study Their Collective Behaviors2023

    • Author(s)
      Imamura Ryuki、Nakane Yurina、Jiajing Hu、Ito Hiroshi、Sugi Takuma
    • Journal Title

      Journal of Visualized Experiments

      Volume: 1 Issue: 198 Pages: 10-10

    • DOI

      10.3791/65569

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] ライトフィールドイメージングとアクティブマターの世界2023

    • Author(s)
      杉拓磨
    • Organizer
      新結晶成長学シンポジウム
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] ライトフィールドイメージングが拓く4D生命科学の世界2023

    • Author(s)
      杉拓磨
    • Organizer
      生理研研究会「極限環境適応」
    • Related Report
      2023 Annual Research Report
    • Invited

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Published: 2021-04-28   Modified: 2025-01-30  

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