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Analysis of maternal inheritance safeguarded by "inhibition of recombination" and "selective replication" in chloroplast DNA.

Research Project

Project/Area Number 20K15812
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 44030:Plant molecular biology and physiology-related
Research InstitutionIbaraki University

Principal Investigator

Kobayashi Yusuke  茨城大学, 理工学研究科(理学野), 助教 (20800692)

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: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords母性遺伝 / クラミドモナス / モノプラズミー / 相同組換え / 葉緑体核様体 / 葉緑体DNA / 葉緑体母性遺伝 / ヘテロプラズミー / 葉緑体DNA合成
Outline of Research at the Start

葉緑体DNAは多くの藻類・植物においてメンデル遺伝から逸脱し、母性遺伝する。同型配偶子で生殖を行う緑藻クラミドモナスでは接合子形成約60分後にオスの葉緑体DNAが選択的に分解されることが知られている。さらに本研究では、同生物の接合子で観察される葉緑体DNAの「組換え抑制」と「選択的複製」が母性遺伝を担保することを示し、母性遺伝の新奇モデルを提唱することを目指す。

Outline of Final Research Achievements

Chloroplasts are maternally inherited in many organisms. In Chlamydomonas reinhardtii, male chloroplast DNA is selectively degraded during the early stage of zygote maturation. Our study suggests that although there are approximately 80 copies in a chloroplast, limited number of the copies are templated recurrently. This replication system may guarantee maternal inheritance by selectively replicating female chloroplast DNA even when male chloroplast DNA remains in the zygote. We also show that zygote-specific homologous recombination factors are important to stabilize the chloroplast genome to the next generation.

Academic Significance and Societal Importance of the Research Achievements

葉緑体は光合成を行うことで地球上の多くの生命を支えている。葉緑体DNAに外来遺伝子を導入することで多量の有用タンパク質を葉緑体内に蓄積させ、これをワクチンに利用する研究が進んでいる。また葉緑体が母性遺伝するという特徴から、葉緑体DNAに導入した外来遺伝子は花粉などによって野外に拡散されにくいと考えられている。葉緑体DNAの母性遺伝機構を理解すれば、その知見は有用作物の育種技術に応用できると期待される。

Report

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

    (12 results)

All 2023 2022 2021 2020

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 3 results) Presentation (7 results) (of which Int'l Joint Research: 1 results,  Invited: 2 results) Book (1 results)

  • [Journal Article] HBD1 protein with a tandem repeat of two HMG-box domains is a DNA clip to organize chloroplast nucleoids in <i>Chlamydomonas reinhardtii</i>2021

    • Author(s)
      Takusagawa Mari、Kobayashi Yusuke、Fukao Yoichiro、Hidaka Kumi、Endo Masayuki、Sugiyama Hiroshi、Hamaji Takashi、Kato Yoshinobu、Miyakawa Isamu、Misumi Osami、Shikanai Toshiharu、Nishimura Yoshiki
    • Journal Title

      Proceedings of the National Academy of Sciences

      Volume: 118 Issue: 20 Pages: 463-475

    • DOI

      10.1073/pnas.2021053118

    • NAID

      120007035840

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Holliday Junction Resolvase MOC1 Maintains Plastid and Mitochondrial Genome Integrity in Algae and Bryophytes2020

    • Author(s)
      Kobayashi Yusuke、Odahara Masaki、Sekine Yasuhiko、Hamaji Takashi、Fujiwara Sumire、Nishimura Yoshiki、Miyagishima Shin-ya
    • Journal Title

      Plant Physiology

      Volume: 184 Issue: 4 Pages: 1870-1883

    • DOI

      10.1104/pp.20.00763

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Evolutionary Changes in DnaA-Dependent Chromosomal Replication in Cyanobacteria2020

    • Author(s)
      Ohbayashi Ryudo、Hirooka Shunsuke、Onuma Ryo、Kanesaki Yu、Hirose Yuu、Kobayashi Yusuke、Fujiwara Takayuki、Furusawa Chikara、Miyagishima Shin-ya
    • Journal Title

      Frontiers in Microbiology

      Volume: 11

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Dynamic Motion of Chloroplast Nucleoids Captured by the Microfluidic System2020

    • Author(s)
      Yoshitaka Kamimura, Yusuke Kobayashi, Yoshiki Nishimura
    • Journal Title

      Cytologia

      Volume: 85 Pages: 177-178

    • NAID

      130007907372

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] 葉緑体核様体の分配に関わる新規因子MOC2の同定2022

    • Author(s)
      大谷直央、廣門秀仁、石橋幸大、西村芳樹、小林優介
    • Organizer
      日本植物学会第86回大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 単細胞紅藻 Cyanidioschyzon merolaeを用いた葉緑体DNA修復機構の進化・多様性の研究2022

    • Author(s)
      川戸祥子、小林優介
    • Organizer
      日本植物学会第86回大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Holliday junction resolvase MOC1 mediates plastid and mitochondrial genome segregation2021

    • Author(s)
      小林優介
    • Organizer
      IRN日仏研究交流
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 葉緑体核様体の分子構造と進化に関する研究2020

    • Author(s)
      小林優介
    • Organizer
      令和2年度茨城大学学長学術表彰 表彰式・受賞記念講演会
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] Holliday junction resolvase MOC1 maintains plastid and mitochondrial genome integrity2020

    • Author(s)
      小林優介
    • Organizer
      第43回日本分子生物学会年会
    • Related Report
      2020 Research-status Report
  • [Presentation] 苔類ゼニゴケにおける葉緑体核様体の新奇光応答反応―光分散・暗集合反応―2020

    • Author(s)
      石原静圭、坂下幸汰、石田悠介、木森義隆、西村芳樹、小林優介、岩渕功誠、西村いくこ
    • Organizer
      2020近畿植物学会
    • Related Report
      2020 Research-status Report
  • [Presentation] 陸上植物系統において真核生物型DNAリガーゼIが葉緑体局在を獲得した分子基盤2020

    • Author(s)
      浜地貴志、小林優介、山岡尚平、鹿内利治、西村芳樹
    • Organizer
      日本植物学会第84回大会
    • Related Report
      2020 Research-status Report
  • [Book] Chapter 7 - Organelle heredity, The Chlamydomonas Sourcebook (Third Edition)2023

    • Author(s)
      Sunjoo Joo, Yusuke Kobayashi, Jae-Hyeok Lee, Yoshiki Nishimura,
    • Total Pages
      33
    • Publisher
      Academic Press,
    • ISBN
      9780128224571
    • Related Report
      2022 Annual Research Report

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

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