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Elucidation of the molecular mechanisms governing totipotency in mouse embryos

Research Project

Project/Area Number 20K06605
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 43050:Genome biology-related
Research InstitutionThe University of Tokyo (2021-2022)
Kindai University (2020)

Principal Investigator

Tomikawa Junko  東京大学, 生命科学ネットワーク, 特任助教 (80534990)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords全能性 / ゲノム高次構造 / 核内高次構造 / 核内ゲノム高次構造 / 3D DNA-FISH / Hi-C / リボソームDNA / クロマチン高次構造 / エピゲノム
Outline of Research at the Start

卵子と精子が融合した受精卵は、全能性を獲得して初期胚発生の特定の時期までその性質を維持している。本研究では、マウス初期発生での最初の分化である全能性細胞からの胎仔、胎盤系列幹細胞への発生・分化段階に着目し、全能性細胞である2細胞期胚、胎仔側モデルであるEmbryonic stem(ES)細胞、胎盤側モデルであるTrophoblast stem(TS)細胞の三者の核内でのゲノムDNAの高次構造を比較・解析し、2細胞期胚に特異的なゲノム高次構造やそれに寄与するゲノム領域、タンパク因子の同定を目指す。

Outline of Final Research Achievements

In this study, I used the mouse as a model to examine the role of higher-order nuclear DNA structures found in 2-cell stage embryos in the property of totipotency. 3D DNA-FISH analysis revealed a hub-shaped interaction between chromosome 17 and chromosome 11. On the other hand, while motif analysis suggested the involvement of Cux1 protein in hub formation in 2-cell mouse embryos, Cux1-knockout mice develop up to 9.5 days of gestation. These results indicated that Cux1 is not a factor involved in totipotency itself.

Academic Significance and Societal Importance of the Research Achievements

分化した体細胞の核を人為的に初期化(リプログラミング)する方法としては、体細胞核を除核した卵子に移植する方法、体細胞をES細胞と融合する方法、あるいは特定の転写因子群を体細胞に導入する方法が知られている。しかし、これらのリプログラミング法に比べて自然生殖での全能性獲得の効率は圧倒的に高い。つまり、自然生殖における全能性獲得の分子機構の解明は、正常発生におけるリプログラミング機構の理解だけでなく、体細胞核を効率よくリプログラミングする方法の開発につながり、良質なiPS細胞などを用いた再生医療への応用といった観点からも極めて重要といえる。

Report

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

    (7 results)

All 2022 2021 2020

All Journal Article (6 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 6 results,  Open Access: 6 results) Presentation (1 results)

  • [Journal Article] Nuclear transfer system for the direct induction of embryonic transcripts from intra- and cross-species nuclei using mouse 4-cell embryos2022

    • Author(s)
      Tomikawa Junko、Penfold Christopher A.、Hatakeyama Rena、Miyamoto Kei
    • Journal Title

      STAR Protocols

      Volume: 3 Issue: 2 Pages: 101284-101284

    • DOI

      10.1016/j.xpro.2022.101284

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Cell division- and DNA replication-free reprogramming of somatic nuclei for embryonic transcription2021

    • Author(s)
      Tomikawa Junko、Penfold Christopher A.、Kamiya Takuma、Hibino Risa、Kosaka Ayumi、Anzai Masayuki、Matsumoto Kazuya、Miyamoto Kei
    • Journal Title

      iScience

      Volume: 24 Issue: 11 Pages: 103290-103290

    • DOI

      10.1016/j.isci.2021.103290

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Structural alteration of the nucleus for the reprogramming of gene expression2021

    • Author(s)
      Tomikawa Junko、Miyamoto Kei
    • Journal Title

      The FEBS Journal

      Volume: - Issue: 22 Pages: 7221-7233

    • DOI

      10.1111/febs.15894

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Visualization of endogenous nuclear F-actin in mouse embryos reveals abnormal actin assembly after somatic cell nuclear transfer.2020

    • Author(s)
      Shindo T, Ihashi S, Sakamoto Y, Okuno T, Tomikawa J, Miyamoto K.
    • Journal Title

      J Biochem.

      Volume: mvaa125 Issue: 3 Pages: 303-311

    • DOI

      10.1093/jb/mvaa125

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Inducible Kiss1 knockdown in the hypothalamic arcuate nucleus suppressed pulsatile secretion of luteinizing hormone in male mice2020

    • Author(s)
      Shiori Minabe, Sho Nakamura, Eri Fukushima, Marimo Sato, Kana Ikegami, Teppei Goto, Makoto Sanbo, Masumi Hirabayashi, Junko Tomikawa, Takuya Imamura, Naoko Inoue, Yoshihisa Uenoyama, Hiroko Tsukamura, Kei-Ichiro Maeda, Fuko Matsuda
    • Journal Title

      Journal of Reproduction and Development

      Volume: Epub Issue: 4 Pages: 369-375

    • DOI

      10.1262/jrd.2019-164

    • NAID

      130007888724

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Conditional Kisspeptin Neuron-Specific Kiss1 Knockout With Newly Generated Kiss1-floxed and Kiss1-Cre Mice Replicates a Hypogonadal Phenotype of Global Kiss1 Knockout Mice2020

    • Author(s)
      Kana Ikegami, Teppei Goto, Sho Nakamura, Youki Watanabe, Arisa Sugimoto, Sutisa Majarune, Kei Horihata, Mayuko Nagae, Junko Tomikawa, Takuya Imamura, Makoto Sanbo, Masumi Hirabayashi, Naoko Inoue, Kei-Ichiro Maeda, Hiroko Tsukamura, Yoshihisa Uenoyama
    • Journal Title

      J Reprod Dev.

      Volume: in press Issue: 4 Pages: 359-367

    • DOI

      10.1262/jrd.2020-026

    • NAID

      130007888736

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] マウス胚を用いた細胞分裂・DNA複製非依存的転写リプログラミング2021

    • Author(s)
      冨川順子
    • Organizer
      第114回日本繁殖生物学会
    • Related Report
      2021 Research-status Report

URL: 

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

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