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Deciphering the Mechanism of Foxp3 Expression Control in Vivo Using Transcriptional Dynamics Analysis and CRISPR

Research Project

Project/Area Number 21K07082
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 49070:Immunology-related
Research InstitutionKumamoto University

Principal Investigator

Ono Masahiro  熊本大学, ヒトレトロウイルス学共同研究センター, 特任教授 (60447951)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
KeywordsTranscription / T cells / Fluorescent Timer / Tocky / T細胞 / 転写 / 時間動態 / トランスジェネシス / 免疫学 / 転写因子 / T細胞分化 / 制御性T細胞 / CRISPR
Outline of Research at the Start

制御性T細胞は転写因子Foxp3のはたらきにより免疫反応を抑制する活性をもつ.しかし制御性T細胞が生体内でどのようなタイミングで抑制活性を発揮するのか、その動的な分子メカニズムは何かについては概ね不明である.このため申請者は蛍光タイマータンパクをレポーター遺伝子として用いて生体内での転写の時間動態を1細胞レベルで解析する技術Tockyを開発し,免疫反応中のT細胞におけるFoxp3転写動態の研究を進めてきた.
本研究は免疫反応中にFoxp3がどのような時間動態で制御されるかについて検討し、その基盤となる分子機序の解明を目指す.

Outline of Final Research Achievements

This study advanced the application of a technique developed by the applicant, called Tocky, which uses a fluorescent Timer protein as a reporter gene to analyze transcriptional dynamics at the single-cell level in vivo, specifically targeting Foxp3 transcription dynamics in T cells during immune responses. This research involved the generation and utilization of mice (Foxp3-Tocky CNS2 KO) with a CRISPR-edited deletion in the CNS2 sequence of Foxp3-Tocky. These mice were employed to study various T cell immune induction models, including steady-state, developmental, and disease contexts such as contact hypersensitivity. The research focused on examining how these cells establish a transcription program in response to immune challenges. Special emphasis was placed on understanding the temporal dynamics of Foxp3 transcription and the regulatory effects of CNS2 sequence deletion, particularly as cells transition into an activated state under antigen stimulation or inflammatory conditions.

Academic Significance and Societal Importance of the Research Achievements

1)この研究は、免疫細胞内の転写因子の調節の分子的複雑さを強調し、Foxp3の転写動態に関する重要な洞察を提供します。CNS2調節配列とその遺伝子発現制御の役割に焦点を当てることで、遺伝子および細胞生物学の既存概念を再定義する可能性のある遺伝子調節の基本的な側面を探求します。

2)蛍光タイマータンパクをレポーター遺伝子として使用したTocky 技術、とくにFoxp3-Tockyツールは申請者(小野昌弘)が開発した独自の革新的技術です。この技術を発展させ、生体内の一細胞レベルでの遺伝子発現変化をリアルタイムで追跡するこの方法は、細胞プロセスの動的研究に新たな次元を提供します。

Report

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

    (7 results)

All 2024 2022 Other

All Int'l Joint Research (3 results) Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results,  Open Access: 1 results) Remarks (1 results)

  • [Int'l Joint Research] Imperial College London/Institute for Cancer Research/University College London(英国)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] Imperial College London/The Institute of Cancer Research/University College London(英国)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] Imperial College London(英国)

    • Related Report
      2021 Research-status Report
  • [Journal Article] Unraveling T-cell dynamics using fluorescent timer: Insights from the Tocky system2024

    • Author(s)
      Ono Masahiro
    • Journal Title

      Biophysics and Physicobiology

      Volume: 21 Issue: Supplemental Pages: n/a

    • DOI

      10.2142/biophysico.bppb-v21.s010

    • ISSN
      2189-4779
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Single-cell level temporal profiling of tumour-reactive T cells under immune checkpoint blockade2022

    • Author(s)
      Hassan Jehanne、Appleton Elizabeth、Kalfaoglu Bahire、Pedersen Malin、Almeida-Santos Jose、Kanemaru Hisashi、Irie Nobuko、Foo Shane、Reda Omnia、Tan Benjy J.Y.、Okazaki Il-mi、Okazaki Taku、Satou Yorifumi、Harrington Kevin、Melcher Alan、Ono Masahiro
    • Journal Title

      bioRxiv

      Volume: 0 Pages: 0-0

    • DOI

      10.1101/2022.07.19.500582

    • Related Report
      2022 Research-status Report
  • [Journal Article] Temporal profiling of CD4 T-cell activation and differentiation upon SARS-CoV-2 spike protein immunisation2022

    • Author(s)
      Almeida-Santos Jos?、Berkachy Rita、Tye Chanidapa Adele、Hassan Jehanne、Kalfaoglu Bahire、Selkirk Murray E.、Ono Masahiro
    • Journal Title

      bioRxiv

      Volume: 0 Pages: 0-0

    • DOI

      10.1101/2022.07.21.500987

    • Related Report
      2022 Research-status Report
  • [Remarks] 研究者による個人ページ

    • URL

      https://monotockylab.github.io

    • Related Report
      2023 Annual Research Report

URL: 

Published: 2021-04-28   Modified: 2025-01-30  

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