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Analysis of mutation induction by low concentration tritiated water

Research Project

Project/Area Number 19K12318
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 63020:Radiation influence-related
Research InstitutionIbaraki University

Principal Investigator

Tauchi Hiroshi  茨城大学, 理工学研究科(理学野), 教授 (70216597)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywordsトリチウム / 突然変異 / 低線量率 / 放射線生物影響 / 低線量率影響 / 体細胞突然変異 / 低線量放射線
Outline of Research at the Start

本研究では、低線量率トリチウム水被ばくによる確率的影響の代表として体細胞突然変異を指標とし、線量・線量率と変異の量的・質的変化の関係を明らかにする。そのために、より低バックグラウンドかつ高感度の新規の細胞実験系を樹立する。初年度には、ゲノム編集技術を用いて既存の突然変異高感度検出系を改良するとともに、低線量率トリチウム水の曝露による遺伝子突然変異の量的・質的な変化について、ヒトX染色体の解析マーカーをさらに増やすことで詳しく解析する。次年度以降は、改良された実験系を用いて、低線量率トリチウム水が誘発する突然変異の解析を行う。

Outline of Final Research Achievements

The purpose of the research is clarifying the quantitative and qualitative changes in somatic mutations induced by low-dose-rate tritiated water exposure. First, we tried to improve the hyper-sensitive system for somatic mutation induction, which was established by introducing a human X-chromosome to HPRT-deficient hamster cells, by using genome editing technique. In parallel with the cell system improvement, we performed a detailed analysis of mutants that were induced by low-level tritiated water (HTO). Although the cell system improvement is still in progress, multiple candidate clones were obtained. Analysis of HTO-induced mutation was completed, and the work has been published in a peer-reviewed international journal.

Academic Significance and Societal Importance of the Research Achievements

低濃度トリチウム水曝露による確率的影響の解析実験例については、実験可能な施設が限られていることや、取扱いのノウハウを継承している研究室が非常に少ないことから、データがほとんど無いのが現状である。研究代表者はトリチウム実験ノウハウを有する数少ない研究者のひとりであり、本課題の実施によって、低レベルトリチウムによる遺伝子突然変異の原因が、放射線そのものというよりも自然発生事象の増幅である可能性を示した。本課題の成果は、まだまだ未解明な点が多い低線量率放射線の生体影響について、単なる頻度ではなく質的な観点から区分できる可能性を示し、放射線被ばく影響に関する新たな考え方につながる成果である。

Report

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

    (11 results)

All 2022 2021 2020 2019 Other

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

  • [Journal Article] Induction of somatic mutations by low concentrations of tritiated water (HTO): evidence for the possible existence of a dose-rate threshold2021

    • Author(s)
      Nagashima Haruki、Hayashi Yuki、Sakamoto Yuki、Komatsu Kenshi、Tauchi Hiroshi
    • Journal Title

      Journal of Radiation Research

      Volume: 62 Issue: 4 Pages: 582-589

    • DOI

      10.1093/jrr/rrab022

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Health effects triggered by tritium: How do we get public understanding based on scientifically supported evidence?2021

    • Author(s)
      Matsumoto H, Shimada Y, Nakamura AJ, Usami N, Ojima M, Kakinuma S, Shimada M, Sunaoshi M, Hirayama R, Tauchi H.
    • Journal Title

      J Radiat Res

      Volume: in press Issue: 4 Pages: 1-1

    • DOI

      10.1093/jrr/rrab029

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Mitotic cells can repair DNA double-strand breaks via a homology-directed pathway2021

    • Author(s)
      Sakamoto Yuki、Kokuta Tetsuya、Teshigahara Ai、Iijima Kenta、Kitao Hiroyuki、Takata Minoru、Tauchi Hiroshi
    • Journal Title

      Journal of Radiation Research

      Volume: 62 Issue: 1 Pages: 25-33

    • DOI

      10.1093/jrr/rraa095

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Dose and Dose-rate dependence of radiation-induced mutation: An approach using a hyper-sensitive cell system.2022

    • Author(s)
      Nagashima H., Hayashi Y., Tanimoto S., Shiraishi K., Sakamoto Y., Tauchi H.
    • Organizer
      The 6th International Symposium of the Network-type Joint Usage/ Research Center for Radiation Disaster Medical Science
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] ヒト染色体移入ハムスター細胞を用いた放射線誘発体細胞突然変異の線量・線量率依存性解析2021

    • Author(s)
      長島明輝、林 雄樹、谷本早紀、白石久美子、小松賢志、田内 広
    • Organizer
      日本放射線影響学会第64回大会
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] 様々な線量のX 線により誘発された突然変異体の変異スペクトル解析2021

    • Author(s)
      谷本 早紀、長島 明輝、林 雄樹、細江 一希、白石 久美子、小松 賢志、田内 広
    • Organizer
      日本放射線影響学会第64回大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Analysis of Dose and Dose-rate dependence of Radiation-Type mutation induced by tritiated water: An approach using a hyper-sensitive cell system2021

    • Author(s)
      Nagashima H., Hayashi Y., Tanimoto S., Shiraishi K., Sakamoto Y., Tauchi H.
    • Organizer
      IES International Symposium on“Environmental Dynamics of Radionuclides and Biological Effects of Low Dose-Rate Radiation”
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 低濃度トリチウム水による体細胞突然変異体の変異スペクトル解析2020

    • Author(s)
      長島明輝、林雄樹、細江一稀、白石久美子、大川沙織、小松賢志、立花 章、田内 広
    • Organizer
      日本放射線影響学会第63回大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 高感度検出系を用いたトリチウム水による体細胞突然変異体の解析2019

    • Author(s)
      長島 明輝、林 雄樹、細江一稀、白石久美子、大川沙織、小松賢志、立花 章、田内 広
    • Organizer
      日本放射線影響学会第62回大会
    • Related Report
      2019 Research-status Report
  • [Remarks] 田内研究室ホームページ

    • URL

      http://tauchilab.sci.ibaraki.ac.jp

    • Related Report
      2021 Annual Research Report
  • [Remarks] 田内研究室

    • URL

      http://tauchilab.sci.ibaraki.ac.jp

    • Related Report
      2020 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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