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Role of retrotransposons in early embryonic development and totipotency control

Research Project

Project/Area Number 20K21507
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 48:Biomedical structure and function and related fields
Research InstitutionKeio University

Principal Investigator

MURANO Kensaku  慶應義塾大学, 医学部(信濃町), 講師 (80535295)

Project Period (FY) 2020-07-30 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2021: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2020: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Keywordsレトロトランスポゾン / 初期胚発生 / LINE-1 / マウス初期胚 / ウイルス様粒子 / 全能性 / トランスポゾン
Outline of Research at the Start

マウスのレトロトランスポゾンMuERVLは、ゲノムの1000ヶ所以上に存在する。マウス未着床初期胚発生において、MuERVLは2細胞期に急激に活性化した後、徐々に減少し着床前の胚盤胞ではほとんど検出されなくなる。本研究では、MuERVLがコードするタンパク質やRNAがどのように初期胚発生に関わるのかを解明し、トランスポゾンと宿主の共生関係について理解を深める。

Outline of Final Research Achievements

The host defense mechanism against LINE-1, a retrotransposon highly expressed during early embryogenesis, remains elusive. We identified TDP-43 as a protein interacting with LINE-1 ORF1 protein from cell extract of a two-cell stage-like cell derived from mouse ES cells. We tried to knock down TDP-43 expression by injecting siRNA into fertilized mouse eggs. TDP-43 knockdown significantly increased LINE-1 copy number on the mouse genome. These results indicate that TDP-43 contributes to genome integrity by suppressing LINE-1, which is de-repressed during early embryogenesis.

Academic Significance and Societal Importance of the Research Achievements

LINE-1はマウスゲノムの約20%を占め、ゲノム上に自分自身のコピーを増やしていく性質を持つレトロトランスポゾンである。初期胚発生過程においてLINE-1は高発現するが、その生物的な意義や、宿主への影響についての研究はまだ少ない。本研究の成果により、TDP-43は初期胚発生の過程で脱抑制されるLINE-1の転移活性を抑制し、ゲノム恒常性の維持に寄与していていることが示された。本研究によりトランスポゾンと宿主の共生関係の一端が明らかとなった。

Report

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

    (5 results)

All 2021 2020 Other

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (2 results) Remarks (1 results)

  • [Journal Article] Potent mouse monoclonal antibodies that block SARS-CoV-2 infection2021

    • Author(s)
      Guo Youjia、Kawaguchi Atsushi、Takeshita Masaru、Sekiya Takeshi、Hirohama Mikako、Yamashita Akio、Siomi Haruhiko、Murano Kensaku
    • Journal Title

      Journal of Biological Chemistry

      Volume: 296 Pages: 100346-100346

    • DOI

      10.1016/j.jbc.2021.100346

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Piwi suppresses transcription of Brahma-dependent transposons via Maelstrom in ovarian somatic cells2020

    • Author(s)
      Onishi Ryo、Sato Kaoru、Murano Kensaku、Negishi Lumi、Siomi Haruhiko、Siomi Mikiko C.
    • Journal Title

      Science Advances

      Volume: 6 Issue: 50

    • DOI

      10.1126/sciadv.aaz7420

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Inhibition of LINE-1 retrotransposition by TDP-43 during embryogenesis2021

    • Author(s)
      Ten D. Li, Kensaku Murano, Haruhiko Siomi
    • Organizer
      第22回日本RNA学会年会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Potent mouse monoclonal antibodies that block SARS-CoV-2 infection2020

    • Author(s)
      村野健作
    • Organizer
      第43回日本分子生物学会
    • Related Report
      2020 Research-status Report
  • [Remarks] Siomi lab

    • URL

      http://siomilab.med.keio.ac.jp

    • Related Report
      2021 Annual Research Report 2020 Research-status Report

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Published: 2020-08-03   Modified: 2023-01-30  

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