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Evaluation of potentiality of wild genetic resources and development of mutagenetic tools in the oil-producing microalga Botryococcus braunii

Research Project

Project/Area Number 20K06215
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 40030:Aquatic bioproduction science-related
Research InstitutionOsaka Institute of Technology

Principal Investigator

Kawamura Koji  大阪工業大学, 工学部, 准教授 (00595613)

Project Period (FY) 2020-04-01 – 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 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords藻類バイオ燃料 / 突然変異育種 / 自然個体群 / Botyrococcus braunii / ボツリオコッカス / トランスポゾン / 熱帯 / 遺伝資源 / スクリーニング / 微細藻類 / Botryococcus
Outline of Research at the Start

微細藻類は光合成によって二酸化炭素と水から脂質、水素など、エネルギーに変換可能な物質を作ることができるため、微細藻類からカーボンニュートラルで再生可能なエネルギーを作るための藻類バイオ燃料の研究が国内外で進められている。本研究は、重油相当の炭化水素を作る特質から石油を作る微細藻類と呼ばれているBotryococcus braunii を研究材料とし、既存株よりも増殖性に優れた新しい野生株の存在可能性を検証する。同時に、イオンビーム照射やトランスポゾンの活性化による突然変異育種技術の開発を行う。

Outline of Final Research Achievements

New methods for isolation and screening of wild strains were developed for the oil-producing microalga Botryococcus braunii. By using the methods, a total of 600 wild strains have been isolated from Japan and Indonesia. Screening of fast-growers identified a novel fast-growing strain (OIT-678) which has a doubling time of 1.2 day. As a new tool for mutagenesis, I have investigated the activation of internal transposable sequences. From the transcript database of Showa strain, transposon-like genes were identified, and four transcriptionally-active retrotransposons were identified in the genome. For these retrotransposons, a high-throughput method for analyzing transposon insertion polymorphisms was developed.

Academic Significance and Societal Importance of the Research Achievements

Botryococcus brauniiは、コスモポリタンな微生物であるものの、一般に生息密度は低いため、自然環境中で発見することは容易ではない。本研究は、野生株を探索して単離する簡易な方法を開発した。また、合成する炭化水素の種類を推定する手法も開発した。これらを使えば、自然界のより多くの野生の遺伝資源を調査することができるだろう。私たちが単離した野生株のなかには、これまで記録されていた増殖速度の最速記録を更新するような株も見つかった。さらに、探索範囲を広げれば、より有用な株が見つかる可能性がある。また、本研究が開発した手法は、生息地の選好性や大量発生メカニズムなど、未知の生態解明にも役立つ。

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 (3 results) Journal Article (3 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (8 results) (of which Int'l Joint Research: 6 results,  Invited: 1 results) Remarks (1 results)

  • [Int'l Joint Research] University of Palangka Raya/Mulawarman University(インドネシア)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] パランカラヤ大学/ムラワルマン大学(インドネシア)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] University of Palangka Raya/Mulawarman University(インドネシア)

    • Related Report
      2020 Research-status Report
  • [Journal Article] BoCAPS: Rapid screening of chemical races in Botryococcus braunii with direct PCR-CAPS2022

    • Author(s)
      Koji KAWAMURA, Suzune NISHIKAWA, Kotaro HIRANO, Ardianor ARDIANOR, Rudy Agung NUGROHO
    • Journal Title

      Algal Research

      Volume: 66 Pages: 102789-102789

    • DOI

      10.1016/j.algal.2022.102789

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Large-scale screening of natural genetic resource in the hydrocarbon-producing microalga Botrycoccus braunii identified novel fast-growing strains.2021

    • Author(s)
      Kawamura, K., Nishikawa, S., Hirano, K. et al.
    • Journal Title

      Scientific Reports

      Volume: 11 Issue: 1 Pages: 7368-7368

    • DOI

      10.1038/s41598-021-86760-8

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The oil-producing microalga Botryococcus braunii: A method for isolation from the natural environment and perspectives on the role of ecological studies in algal biofuel production2020

    • Author(s)
      Koji KAWAMURA, Kotaro HIRANO, ARDIANOR, Rudy Agung NUGROHO
    • Journal Title

      Journal of Ecosystem & Ecography

      Volume: 10 Pages: 274-274

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] BoTIPseq: Transposon-insertion polymorphism sequencing technique for Botryococcus braunii2023

    • Author(s)
      Koji Kawamura, Naoya Komatsubara, Shigeru Okada
    • Organizer
      International Conference on Algal Biomass, Biofuels and Bioproducts (AlgalBBB 2023)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] High-density continuous culture of Botryococcus braunii under strong light conditions2023

    • Author(s)
      Masaya Hashimoto, Sho Matsubara, Haruki Fujisaki, Koji Kawamura
    • Organizer
      International Conference on Algal Biomass, Biofuels and Bioproducts (AlgalBBB 2023)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Survivorship and regrowth potential of single cells released from a colony of Botryococcus braunii2023

    • Author(s)
      Sho Matsubara, Keito Yasuda, Koji Kawamura
    • Organizer
      International Conference on Algal Biomass, Biofuels and Bioproducts (AlgalBBB 2023)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Bioprospecting of the oil-producing microalga Botryococcus braunii: Isolation of high temperature stress tolerant strains2023

    • Author(s)
      Shotaro Ohmae, Shogo Imai, Ryota Sueyoshi, Koji Kawamura
    • Organizer
      International Conference on Algal Biomass, Biofuels and Bioproducts (AlgalBBB 2023)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Antibiotics and their optimal concentrations for axenic culture of freshwater microalga Botryococcus braunii2023

    • Author(s)
      Ryusei Miyako and Koji Kawamura
    • Organizer
      International Conference on Algal Biomass, Biofuels and Bioproducts (AlgalBBB 2023)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 微細緑藻Botryococcus braunii S品種はlycopaotaeneを生産するL品種である2022

    • Author(s)
      上杉一馬・Holger Jenke-Kodama・松永茂樹・岡田 茂・河村耕史
    • Organizer
      令和4年度水産学会春季大会
    • Related Report
      2022 Annual Research Report 2021 Research-status Report
  • [Presentation] Microalgae as potential resource for red, white, and green biotechnology2021

    • Author(s)
      Koji KAWAMURA
    • Organizer
      The 1st OCTAL International conference on "Natural products from Tropical Rainforest, Sustainable Development, and Environmental Studies".
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 微細緑藻Botryococcus braunii S品種はS品種特異的な炭化水素を作らない2020

    • Author(s)
      上杉一馬・松永茂樹・岡田 茂・河村耕史
    • Organizer
      令和3年度水産学会春季大会(オンライン発表)
    • Related Report
      2020 Research-status Report
  • [Remarks] 石油を作る微細藻類の研究

    • URL

      http://www.oit.ac.jp/env/voice/201911002

    • Related Report
      2020 Research-status Report

URL: 

Published: 2020-04-28   Modified: 2024-12-25  

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