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Exploring new functions of DNA polymerase zeta using plant-cell systems

Research Project

Project/Area Number 20K12174
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 InstitutionNational Institutes for Quantum Science and Technology

Principal Investigator

Sakamoto Ayako  国立研究開発法人量子科学技術研究開発機構, 高崎量子応用研究所 量子バイオ基盤研究部, 上席研究員 (00354960)

Co-Investigator(Kenkyū-buntansha) 横田 裕一郎  国立研究開発法人量子科学技術研究開発機構, 高崎量子応用研究所 放射線生物応用研究部, 主幹研究員 (30391288)
Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2022: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2021: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
KeywordsDNA二重鎖切断 / ヒメツリガネゴケ / 相同組換え / ガンマ線 / DNAポリメラーゼζ / DNA修復 / オルタナティブエンドジョイニング / ゲノム編集 / 放射線応答 / 染色体
Outline of Research at the Start

真核生物の間で保存されているDNAポリメラーゼζ (Polζ)の新規機能を明らかにする目的で、モデル植物であるシロイヌナズナおよびヒメツリガネゴケを材料として、1) DNA二重鎖切断修復プロセスにおける突然変異の検出、2) リボヌクレオチドの取り込みによるPolζ活性の追跡、3) Polζとの二重欠損によって合成致死となる変異体の探索を行う。これによりPolζのDNA二重鎖切断修復への関与を明らかにし、種を超えて保存されたゲノム維持機構が存在する可能性を示す。

Outline of Final Research Achievements

DNA polymerase ζ (Polζ) has been suggested to have (a) role(s) in DNA double strand break (DSB) repair activities. In this study, we characterized the DSB-repair mechanism in a basal land plant Physcomitrium patens and found that P. patens cells largely rely on homologous recombination (HR) pathway to repair DSBs. We also analyzed a possible function of Polζ in γ ray-induced growth arrest and emergence of cell death over the Arabidopsis root meristems, finding that the cells in Polζ-KO plant undergo cell death in a SOG1-independent manner. In our screen for novel Polζ-interacting proteins, several candidates were detected that showed different expression patterns after γ ray-irradiation.

Academic Significance and Societal Importance of the Research Achievements

Polζはがん細胞の増殖や薬剤耐性獲得との関連が注目されているが、哺乳動物細胞でPolζを欠損させたり過剰発現させるとゲノムが不安定となることが多く、機能の同定が困難であった。本研究はPolζのホモ欠失や過剰発現で生存・稔性にほとんど影響がない植物細胞を利用することでPolζの新規機能に迫る新しい試みである。本研究で明らかになった新機能や新規Polζ相互作用タンパク質などが植物以外でも保存されているならば、界を超えて普遍的なゲノムメンテナンス機構や抗がん剤抵抗性細胞の出現メカニズムなどとも共通した知見となることが見込まれる。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (15 results)

All 2023 2022 2021 2020 Other

All Int'l Joint Research (4 results) Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (10 results) (of which Int'l Joint Research: 1 results,  Invited: 2 results)

  • [Int'l Joint Research] INRAE(フランス)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] INRAE(フランス)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] INRAE(フランス)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] INRAE(フランス)

    • Related Report
      2020 Research-status Report
  • [Journal Article] SOG1, a plant‐specific master regulator of DNA damage responses, originated from nonvascular land plants2021

    • Author(s)
      Sakamoto Ayako N.、Sakamoto Tomoaki、Yokota Yuichiro、Teranishi Mika、Yoshiyama Kaoru O.、Kimura Seisuke
    • Journal Title

      Plant Direct

      Volume: 5 Issue: 12

    • DOI

      10.1002/pld3.370

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Analysis of radiation-induced mutations in HR-proficient and -deficient Physcomitrium patens2023

    • Author(s)
      Ayako N. Sakamoto, Yuichiro Yokota, Fabien Nogue
    • Organizer
      日本植物学会第87回大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] γ-ray sensitivity and mutation analysis in DSB repair-deficient moss plants2023

    • Author(s)
      Ayako N. Sakamoto, Yuichiro Yokota, Fabien Nogue
    • Organizer
      日本放射線影響学会第66回大会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] DNA damage-triggered reprogramming in Physcomitrium patens2023

    • Author(s)
      Nan Gu, Ayako N. Sakamoto, Yosuke Tamada
    • Organizer
      日本放射線影響学会第66回大会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Induction of cell reprogramming by γ-irradiation2023

    • Author(s)
      Ayako N. Sakamoto, Nan Gu, Michiyo Suzuki, Tomo Funayama, Yosuke Tamada
    • Organizer
      QST高崎サイエンスフェスタ2023
    • Related Report
      2023 Annual Research Report
  • [Presentation] The moss plant Physcomitrium patens depends on homologous recombination to repair DNA double strand breaks2022

    • Author(s)
      Ayako N. Sakamoto, Yuichiro Yokota, Fabien Nogue
    • Organizer
      日本放射線影響学会第65回大会
    • Related Report
      2022 Research-status Report
  • [Presentation] Induction of cell reprogramming by means of DNA-damaging treatments2022

    • Author(s)
      Ayako N. Sakamoto, Nan Gu, Michiyo Suzuki, Tomoo Funayama, Yosuke Tamada
    • Organizer
      QST高崎サイエンスフェスタ2022
    • Related Report
      2022 Research-status Report
  • [Presentation] Disruption of SOG1 orthologues diminishes DNA damage responses in Physcomitrium patens2021

    • Author(s)
      Ayako N. Sakamoto, Tomoaki Sakamoto, Yuichiro Yokota, Mika Teranishi, Kaoru O. Yoshiyama, Seisuke Kimura
    • Organizer
      Plant geneome stability and change 2020
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 半数性モデル植物ヒメツリガネゴケにおける放射線誘発突然変異の解析2021

    • Author(s)
      前田奈穂子、柳川慶人、横田裕一郎、坂本綾子
    • Organizer
      QST高崎サイエンスフェスタ2021
    • Related Report
      2021 Research-status Report
  • [Presentation] SOG1 homologues regulate DNA-damage responses in Physcomitrella patens2021

    • Author(s)
      Ayako N. Sakamoto, Tomoaki Sakamoto, Yuichiro Yokota, Mika Teranishi, Seisuke Kimura
    • Organizer
      第62回日本植物生理学会年会
    • Related Report
      2020 Research-status Report
  • [Presentation] 相同組換え経路の破綻がヒメツリガネゴケの放射線抵抗性を喪失させる2020

    • Author(s)
      横田裕一郎、F. Nogue、大野豊、坂本綾子
    • Organizer
      第43回日本分子生物学会年会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2025-01-30  

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