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Analysis of involvement of synaptic plasticity in photoperiodism

Research Project

Project/Area Number 20K06739
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 44050:Animal physiological chemistry, physiology and behavioral biology-related
Research InstitutionOsaka University

Principal Investigator

Hamanaka Yoshitaka  大阪大学, 大学院理学研究科, 助教 (10647572)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords光周性 / 軟体動物 / Caudo-dorsal cell / RNA sequencing / シナプス可塑性
Outline of Research at the Start

無脊椎動物の光周時計の神経要素とその機能原理は長らく不明のままである。本研究では, 軟体動物であるヨーロッパモノアラガイを用いて, 本種の産卵行動にみられる光周性の神経要素を形態学的, 生理学的に同定する。さらに, 神経生物学的観点から『光周性にシナプス可塑性現象が関与するのか?』という問いを明らかにする。

Outline of Final Research Achievements

The pond snail Lymnaea stagnails displays clear photoperiodism in egg-laying behavior, which is known to be triggered by caudo-dorsal cells (CDCs) expressing an ovulation hormone, i.e. CDC hormone (CDCH). We have demonstrated that excitability of CDCs is modulated by photoperiod, which the snails underwent in a previous study. However, the mechanism remains to be revealed. In the present study, I analyzed neurotransmitter receptors that express in CDCs by means of single-cell RNA sequencing, and then I found that plural receptors for a small molecule of classic neurotransmitters express in CDCs. These facts imply that CDCs receive synaptic inputs from unknown pre-synaptic neurons. Accordingly, photoperiod-dependent switching of the excitability of CDCs might be attributed to synaptic plasticity between CDCs and the presynaptic neurons; the latter possibly carrying photoperiodic information to CDCs.

Academic Significance and Societal Importance of the Research Achievements

光周期(季節)の情報は脳内の光周時計で処理されると考えられるが, 無脊椎動物の光周時計の正体やその機能原理は未だ不明である。光周性の神経機構にシナプス可塑性が関与するのか?これは未開拓の課題であり, 本研究の学術的意義は高い。本研究により, ヨーロッパモノアラガイの光周期依存的な産卵調節に関わるCDCがシナプスを介した入力を受けることが支持された。季節という長い時間軸を持った情報が脳でどのように処理されるのか?本研究は, 光による環境周期への生物の適応機構を生理学的に解明しようとする試みであり, 神経行動学の面白さを若い世代に広めるという社会的意義も含んでいる。

Report

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

    (4 results)

All 2021 2020

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (3 results)

  • [Journal Article] Photoperiodic control of electrophysiological properties of the caudo‐dorsal cells in the pond snail, Lymnaea stagnalis2021

    • Author(s)
      Hamanaka Yoshitaka、Shiga Sakiko
    • Journal Title

      Journal of Comparative Neurology

      Volume: 529 Issue: 14 Pages: 3360-3374

    • DOI

      10.1002/cne.25196

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] Photoperiodic effects on clock gene expression in the central nervous system in Lymnaea stagnails2021

    • Author(s)
      Ju Kyungsu, 濵中 良隆, 志賀 向子
    • Organizer
      日本比較生理生化学会
    • Related Report
      2021 Research-status Report
  • [Presentation] Electrophysiological properties and morphology of a neurosecretory canopy cell in the pond snail, Lymnaea stagnalis2021

    • Author(s)
      濵中 良隆, 志賀 向子
    • Organizer
      日本比較生理生化学会
    • Related Report
      2021 Research-status Report
  • [Presentation] The role of neurosecretory canopy cells in photoperiod-dependent reproduction and its morphology in the pond snail, Lymnaea stagnalis2020

    • Author(s)
      Sonoko Fukumoto, Yoshitaka Hamanaka, Sakiko Shiga
    • Organizer
      日本比較生理生化学会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2024-01-30  

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