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Diverse DNA modification in marine prokaryotic and viral communities

Research Project

Project/Area Number 20K15444
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 38020:Applied microbiology-related
Research InstitutionJapan Agency for Marine-Earth Science and Technology

Principal Investigator

Hiraoka Satoshi  国立研究開発法人海洋研究開発機構, 海洋機能利用部門(生命理工学センター), 研究員 (70824423)

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: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2020: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywordsメタエピゲノム解析 / メタゲノム解析 / ロングリード / バイオインフォマティクス / 海洋微生物 / 原核生物 / ウイルス / エピゲノム / 海洋微生物叢 / PacBio / DNA化学修飾 / 海洋細菌叢 / 微生物生態学
Outline of Research at the Start

細菌・古細菌において、塩基のメチル化修飾(DNAメチル化)は生理学的に重要な役割を担っているが、その普遍性や多様性、生態学的な意義は未知である。一方、研究代表者はこれまでに、環境細菌叢の系統網羅的なDNAメチル化観測技術(メタエピゲノム解析)を確立した(Hiraoka et al. Nat. Commun. 2019)。本研究課題では、海洋細菌叢を対象にメタエピゲノム解析を行う。そして、細菌群集内・群集間のDNAメチル化機構の多様性を検証することで、その進化学的・生態学的な意義に迫る。

Outline of Final Research Achievements

DNA chemical modifications, including methylation, are widespread and play important roles in prokaryotes and viruses. However, current knowledge of these modification systems is severely biased towards a limited number of culturable prokaryotes, despite the fact that a vast majority of microorganisms have not yet been cultured. Here, using single-molecule real-time (SMRT) sequencing, we conducted culture-independent ‘metaepigenomic’ analyses (an integrated analysis of metagenomics and epigenomics) of marine microbial communities. We reconstructed >400 metagenomic-assembled genomes (MAGs) from diverse prokaryotes and viruses, respectively, and 220 modified motifs and 276 DNA methyltransferases (MTases) were identified. The MTase-motif correspondence found in the MAGs revealed 10 novel pairs, 5 of which showed novel specificities. Our findings highlight diverse unexplored DNA modifications that potentially affect the ecology and evolution of prokaryotes and viruses in nature.

Academic Significance and Societal Importance of the Research Achievements

本研究課題では、海洋微生物叢を対象に「メタエピゲノム解析」を実施し、ゲノム上のDNA化学修飾(エピゲノム)を大規模に解明した。本研究は、塩基配列のみを解析対象とする狭義のゲノム解析を越えて、エピゲノムをも含む広義のゲノム解析を行うことで、微生物の生理生態や進化により深くアプローチできることを示した成果である。今後、海洋のみならず土壌や腸内といった幅広い環境に生息する微生物叢を対象に解析を実施することで、従来のゲノム解析を越えた、より深い微生物生態系や進化の理解が進むことが期待される。

Report

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

    (10 results)

All 2023 2022 2021 Other

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

  • [Journal Article] Diverse DNA modification in marine prokaryotic and viral communities2022

    • Author(s)
      Hiraoka Satoshi、Sumida Tomomi、Hirai Miho、Toyoda Atsushi、Kawagucci Shinsuke、Yokokawa Taichi、Nunoura Takuro
    • Journal Title

      Nucleic Acids Research

      Volume: 50 Issue: 3 Pages: 1531-1550

    • DOI

      10.1093/nar/gkab1292

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 海洋微生物叢を理解するためのゲノムシーケンス解析研究2023

    • Author(s)
      平岡聡史
    • Organizer
      第17回日本ゲノム微生物学会年会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Metaepigenomics reveals diverse DNA modifications in lake and marine prokaryotic and viral communities2022

    • Author(s)
      Satoshi Hiraoka
    • Organizer
      18th International Symposium on Microbial Ecology
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 海洋微生物叢が持つエピゲノムの多様性と進化・生態との関わり2022

    • Author(s)
      平岡聡史、澄田智美、平井美穂、豊田敦、川口慎介、横川太一
    • Organizer
      第16回日本ゲノム微生物学会年会
    • Related Report
      2021 Research-status Report
  • [Presentation] Diverse DNA modification in marine prokaryotic and viral communities2021

    • Author(s)
      Satoshi Hiraoka
    • Organizer
      2021 PacBio Japan Virtual User Group Meeting
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] 海洋細菌叢・ウイルス叢が持つエピゲノムの多様性2021

    • Author(s)
      平岡聡史、澄田智美、平井美穂、豊田敦、川口慎介、横川太一、布浦拓郎
    • Organizer
      日本微生物生態学会第34回大会
    • Related Report
      2021 Research-status Report
  • [Presentation] 'Metaepigenomic' analysis for identification of unexplored prokaryotic DNA methylation in nature.2021

    • Author(s)
      Satoshi Hiraoka
    • Organizer
      第94回日本細菌学会総会(国際シンポジウム)
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] バイオインフォマティクスによる環境微生物生態へのアプローチ2021

    • Author(s)
      平岡聡史
    • Organizer
      第15回日本ゲノム微生物学会年会
    • Related Report
      2020 Research-status Report
    • Invited
  • [Book] 未培養微生物研究の最新動向2023

    • Author(s)
      青柳秀紀
    • Total Pages
      263
    • Publisher
      シーエムシー出版
    • ISBN
      9784781317328
    • Related Report
      2022 Annual Research Report
  • [Remarks] 海洋細菌叢・ウイルス叢が持つDNA化学修飾(エピゲノム)を大規模に解明

    • URL

      https://www.jamstec.go.jp/j/about/press_release/20220121/

    • Related Report
      2021 Research-status Report

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

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