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Mechanism of how circadian clock in the suprachiasmatic nucleus recognizes day length

Research Project

Project/Area Number 19K06774
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 InstitutionUniversity of Toyama (2020-2022)
Kindai University (2019)

Principal Investigator

Yoshikawa Tomoko  富山大学, 学術研究部教育研究推進系, 准教授 (30451397)

Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2019: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords概日時計 / 視交叉上核 / 振動体 / 位相 / 日長 / 活動期 / Clock変異マウス / 位相波 / 発光レポーター / 時計遺伝子
Outline of Research at the Start

哺乳類の概日時計は視交叉上核に存在し、日暮れと夜明けのそれぞれを認識する2つ振動体を持つ。この2つを使って日長の変化を識別すると考えられるが、そのメカニズムは不明である。視交叉上核における時計遺伝子の発現リズムには、隣り合う細胞が段階的にピークを迎える位相波が存在する。位相波の進行速度は日長と相関することから、日長認識に位相波が重要な役割を果たすと考えられる。本研究では、まず発現遺伝子の網羅解析やコネクトーム解析を通して位相波形成メカニズムを明らかにし、その結果をもとに、動物が日長を認識するメカニズムを解明する。その成果は、その発症に日長が関与する気分障害などの予防・治療法の開発につながる。

Outline of Final Research Achievements

The circadian clock is an important physiological function that allows organisms to anticipate changes in their natural environment and regulate their physiology. Nocturnal animals start their activities in the evening and end in the morning. These timings are thought to be controlled by separate circadian oscillators, however, the mechanism is not fully understood. In this study, in order to understand how the circadian oscillators recognize morning and evening, and determine the length of the active period, we analyzed activity rhythms and clock gene expression rhythms in mice with a mutation in the clock gene.

Academic Significance and Societal Importance of the Research Achievements

概日リズムの乱れは、心身の健康に影響を及ぼすことから、大きな社会問題となっている。特に、本来暗いはずの夜間に光にさらされることで、睡眠の質の低下や就寝・起床時刻の後退が引き起こされ、社会生活に支障をきたすことも広く知られるところである。しかし、現代社会において、真っ暗な夜を過ごすように人々に求めることは難しい。すなわち、うまく光と付き合うことが必要である。本研究では、動物モデル用い、光、概日時計、そして活動リズムの間の未解明部分に迫り、現在社会の問題解決に資する知見の獲得を目指した。

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (16 results)

All 2023 2022 2021 2020 2019 Other

All Int'l Joint Research (2 results) Journal Article (7 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 7 results,  Open Access: 6 results) Presentation (7 results) (of which Int'l Joint Research: 4 results,  Invited: 2 results)

  • [Int'l Joint Research] Dartmouth College/Columbia University/Barnard College(米国)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] Columbia University/Barnard College/Dartmouth College(米国)

    • Related Report
      2020 Research-status Report
  • [Journal Article] Action potential firing rhythms in the suprachiasmatic nucleus of the diurnal grass rat, Arvicanthis niloticus2023

    • Author(s)
      Morioka Eri、Miyamoto Tsubasa、Tamogami Sakura、Koketsu Takahiro、Kim Juhyon、Yoshikawa Tomoko、Mochizuki Takatoshi、Ikeda Masayuki
    • Journal Title

      Neuroscience Letters

      Volume: 792 Pages: 136954-136954

    • DOI

      10.1016/j.neulet.2022.136954

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Circadian expression and specific localization of synaptotagmin17 in the suprachiasmatic nucleus, the master circadian oscillator in mammals2023

    • Author(s)
      Fujioka Atsuko、Nagano Mamoru、Ikegami Keisuke、Masumoto Koh-hei、Yoshikawa Tomoko、Koinuma Satoshi、Nakahama Ken-ichi、Shigeyoshi Yasufumi
    • Journal Title

      Brain Research

      Volume: 1798 Pages: 148129-148129

    • DOI

      10.1016/j.brainres.2022.148129

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Mitochondrial LETM1 drives ionic and molecular clock rhythms in circadian pacemaker neurons2022

    • Author(s)
      Morioka E, Kasuga Y, Kanda Y, Moritama S, Koizumi H, Yoshikawa T, Miura N, Ikeda M, Higashida H, Holmes TC and Ikeda M
    • Journal Title

      Cell Reports

      Volume: 39 Issue: 6 Pages: 110787-110787

    • DOI

      10.1016/j.celrep.2022.110787

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Regionality of short and long period oscillators in the suprachiasmatic nucleus and their manner of synchronization2022

    • Author(s)
      Morimoto Tadamitsu、Yoshikawa Tomoko、Nagano Mamoru、Shigeyoshi Yasufumi
    • Journal Title

      PLOS ONE

      Volume: 17 Issue: 10 Pages: e0276372-e0276372

    • DOI

      10.1371/journal.pone.0276372

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Phase Gradients and anisotropy of the suprachiasmatic network: Discovery of phaseomes.2021

    • Author(s)
      Tomoko Yoshikawa, Scott Pauls, Nicholas Foley, Alana Taub, Joseph LeSauter, Duncan Foley, Ken-Ichi Honma, Sato Honma, Rae Silver
    • Journal Title

      eNeuro

      Volume: 8 Issue: 5 Pages: 1-12

    • DOI

      10.1523/eneuro.0078-21.2021

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Transgenic rats expressing dominant negative BMAL1 showed circadian clock amplitude reduction and rapid recovery from jet lag2021

    • Author(s)
      Minami Yoichi、Yoshikawa Tomoko、Nagano Mamoru、Koinuma Satoshi、Morimoto Tadamitsu、Fujioka Atsuko、Furukawa Keiichi、Ikegami Keisuke、Tatemizo Atsuhiro、Egawa Kentaro、Tamaru Teruya、Taniguchi Taizo、Shigeyoshi Yasufumi
    • Journal Title

      European Journal of Neuroscience

      Volume: 53 Issue: 6 Pages: 1783-1793

    • DOI

      10.1111/ejn.15085

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Bright light improves sleep in patients with Parkinson’s disease: possible role of circadian restoration.2020

    • Author(s)
      Takuyuki Endo, Ritsuko Matsumura, Isao T. Tokuda, Tomoko Yoshikawa, Yasufumi Shigeyoshi, Koichi Node, Saburo Sakoda and Makoto Akashi
    • Journal Title

      Scietntific Reports

      Volume: 10 Issue: 1 Pages: 7982-7982

    • DOI

      10.1038/s41598-020-64645-6

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] PER2::LUC bioluminescence imaging of mouse horizontal SCN slice revealed different responses to phase advance and delay shift of LD cycles2022

    • Author(s)
      Yoshikawa Tomoko、Morimoto Tadamitsu、Nagano Mamoru、Shigeyoshi Yasufumi
    • Organizer
      Sapporo Symposium on Biological Rhythm 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Bioluminescence imaging of mouse horizontal SCN slice revealed different responses to phase advance and delay shift of LD cycles2022

    • Author(s)
      Yoshikawa Tomoko、Morimoto Tadamitsu、Nagano Mamoru、Shigeyoshi Yasufumi
    • Organizer
      第29回日本時間生物学会学術大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] CaMKIIα is involved in the coupling of the evening and morning circadian oscillators in mice.2021

    • Author(s)
      Tomoko Yoshikawa, Ken-ichi Honma, Sato Honma
    • Organizer
      5th Asian Forum on Chronobiology
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] CaMKIIα is involved in the coupling of the evening and morning circadian oscillators in mice.2021

    • Author(s)
      Tomoko Yoshikawa, Ken-ichi Honma, Sato Honma
    • Organizer
      Symposium on Biological Rhythm 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] CaMKIIα機能的KOはマウスの輪回し活動と自発行動の概日リズムを乖離させる2019

    • Author(s)
      吉川朋子・本間研一・重吉康史・本間さと
    • Organizer
      第90回日本動物学会大会
    • Related Report
      2019 Research-status Report
  • [Presentation] 活動の概日リズムを駆動する複数の振動体:CaMKIIα機能的KOマウスによる解析2019

    • Author(s)
      吉川朋子・本間研一・重吉康史・本間さと
    • Organizer
      第25回 日本時間生物学会学術大会
    • Related Report
      2019 Research-status Report
  • [Presentation] Functional knock-out of CaMKIIα disrupts circadian activity rhythm of mouse.2019

    • Author(s)
      27.Tomoko Yoshikawa, Ken-ichi Honma, Yasufumi Shigeyoshi, Sato Honma
    • Organizer
      Summit on "Dynamic Brain"
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2024-01-30  

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