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In search for genetic factors controlling morphological plasticity of diatom cell wall

Research Project

Project/Area Number 20K06726
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 44040:Morphology and anatomical structure-related
Research InstitutionFukui Prefectural University

Principal Investigator

Sato Shinya  福井県立大学, 海洋生物資源学部, 教授 (80709163)

Co-Investigator(Kenkyū-buntansha) 山田 和正  福井県立大学, 海洋生物資源学部, 助教 (20778401)
出井 雅彦  文教大学, 教育学部, 教授 (60143624)
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: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywords珪藻 / 細胞壁 / 可塑性 / 遺伝子発現 / 塩分 / シリカ / バイオミネラリゼーション / 形態可塑性 / トランスポゾン / 塩分ストレス / トランスクリプトーム / 形態形成
Outline of Research at the Start

単細胞藻類の珪藻はシリカ(珪酸質)の細胞壁をもつ.生化学的研究によりシリカ粒子形成に関わるタンパクの理解は進んでいるものの,細胞壁といった立体構造の形成がどのような遺伝的メカニズムにより制御されているのかは不明である.本研究では塩分変化により形態可塑性を示す珪藻を材料とし、形の決定に関わる遺伝子を探索する.候補遺伝子のノックアウトや情報解析から機能を推定し、細胞壁形態が変わるメカニズムを明らかにする.ここで得られた知見は,立体的なシリカ細胞壁の形作りの謎を解くヒントになるだけでなく,人工的なナノレベル造形による微細回路やナノマシン作成といった技術開発にも寄与することが期待される.

Outline of Final Research Achievements

The effect of salinity on the cell wall formation in the diatom Pleurosira laevis was investigated. We revealed that the flat and dome-shaped valves exhibited plastic changes at a salinity of 2‰ and 7‰, respectively. Transcriptome analysis showed that the expression of mechanosensitive ion channel genes was up-regulated, while Ca2+ ATPase was down-regulated at a salinity of 2‰. Furthermore, genes involved in the binding of the membrane to actin filaments, such as annexin genes, and genes involved in actin filament elongation and cross-linking, such as Arp2/3 genes, showed up-regulation at salinity 2‰. Based on these findings, a new model was proposed to describe the formation of the cell wall in diatoms in response to changes in salinity.

Academic Significance and Societal Importance of the Research Achievements

珪藻はシリカでできた頑強な細胞壁 (殻) をもつ。殻は立体的かつ緻密で微細な構造をもつが、その形態形成がどのような遺伝的メカニズムにより制御されているのかは不明であった。本研究では珪藻プレウロシラの培養実験から、この珪藻が塩濃度の変化に応じて殻面が平らなものとドーム状の2種類の形態を使い分けることを明らかにした。これら2種類の形態を形成する際の遺伝子発現パターンを比較することで、形態形成に関与する遺伝子を明らかにした。この知見は、立体的なシリカ細胞壁の形作りの謎を解くヒントになるだけでなく、人工的なナノレベル造形による微細回路やナノマシン作成といった技術開発にも寄与することが期待される。

Report

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

    (15 results)

All 2023 2022 2021 2020 Other

All Int'l Joint Research (6 results) Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results) Presentation (7 results) (of which Int'l Joint Research: 3 results)

  • [Int'l Joint Research] Royal Botanic Garden Edinburgh(英国)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] University of Texas at Austin(米国)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] IRTA(スペイン)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] The University of Texas at Austin(米国)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] University of the Philippines(フィリピン)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] Freie Universität Berlin(ドイツ)

    • Related Report
      2021 Research-status Report
  • [Journal Article] Morphological plasticity in response to salinity change in the euryhaline diatom <i>Pleurosira laevis</i> (Bacillariophyta)2022

    • Author(s)
      Kamakura Shiho、Ashworth Matt P.、Yamada Kazumasa、Mikami Daichi、Kobayashi Atsushi、Idei Masahiko、Sato Shinya
    • Journal Title

      Journal of Phycology

      Volume: 58 Issue: 5 Pages: 631-642

    • DOI

      10.1111/jpy.13277

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] 塩濃度の変化に応じた珪藻シリカ細胞壁のしなやかな形態変化2022

    • Author(s)
      鎌倉史帆、佐藤晋也
    • Journal Title

      細胞

      Volume: 54 Pages: 28-31

    • Related Report
      2022 Annual Research Report
  • [Presentation] 珪藻Pleurosira laevisの立体的な被殻形態を制御する遺伝子発現の探索2023

    • Author(s)
      鎌倉史帆、佐藤晋也
    • Organizer
      日本藻類学会第47回大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Pleurosira laevisの細胞膜上にみられる多糖状の層構造2022

    • Author(s)
      安藤健太, 鎌倉史帆, 山田和正, 吉川伸哉, 出井雅彦, 佐藤晋也
    • Organizer
      日本珪藻学会第43回大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Comparative transcriptomics in a centric diatom Pleurosira laevis under two salinity conditions, with reference to stress response and morphological plasticity.2021

    • Author(s)
      Kamakura S, Masahiko Idei, Shinya Sato
    • Organizer
      The 4th Asian Congress of Protistology (iACOP-IV, Online)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Comparative morphological and transcriptome analyses of valve plasticity induced under different salinity conditions in a centric diatom Pleurosira laevis.2021

    • Author(s)
      Kamakura S, Idei M, Ashworth M & Sato S
    • Organizer
      Molecular Life of Diatoms 6th Biennial Meeting. Online.
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Salinity-related morphological change in a centric diatom Pleurosira laevis.2021

    • Author(s)
      Kamakura S, Idei M, Ashworth M & Sato S
    • Organizer
      26th International Diatom Symposium. Online.
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 世界初!生きた化石 Pseudopodosira kosugiiの単離培養株の確立2021

    • Author(s)
      佐藤晋也,鎌倉史帆,小原隆哉,馬渕萌恵,佐藤善輝,千葉 崇
    • Organizer
      日本珪藻学会第 41 回研究集会(オンライン開催)
    • Related Report
      2021 Research-status Report
  • [Presentation] 珪藻Pleurosira laevisにおける塩濃度に依存したシリカ細胞壁形態の可塑的変化2020

    • Author(s)
      鎌倉史帆, 出井雅彦, 佐藤晋也
    • Organizer
      日本藻類学会第45回大会
    • Related Report
      2020 Research-status Report

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

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