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The Roles of Transcription Factor GATA2 in T Cell Development by Epigenetic Memory

Research Project

Project/Area Number 22K19537
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 54:Internal medicine of the bio-information integration and related fields
Research InstitutionTohoku University

Principal Investigator

Harigae Hideo  東北大学, 医学系研究科, 教授 (50302146)

Co-Investigator(Kenkyū-buntansha) 加藤 浩貴  東北大学, 大学病院, 講師 (50801677)
Project Period (FY) 2022-06-30 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2023: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2022: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
KeywordsGATA2 / T細胞初期分化 / T細胞分化 / 獲得免疫
Outline of Research at the Start

GATA2は造血幹細胞の維持に必須の転写因子であり、その先天変異は、免疫不全・造血器腫瘍の発症原因となる。GATA2欠損症候群の重症例ではT細胞造血障害が認められるが、成熟したT細胞はGATA2を発現していない。この解離は、造血幹/前駆細胞でのGATA2の欠損がその後のT細胞の機能に影響している可能性を示唆している。その機序として、GATA2が転写因子として造血幹/前駆細胞のエピゲノム状態に影響を与え、これがメモリーとして成熟細胞まで影響を及ぼしていることが想定される。そこで本研究では、GATA2をモデルとし、獲得免疫でのエピゲノムメモリー機構を明らかにする。

Outline of Final Research Achievements

GATA2 is a transcription factor that is essential for the maintenance and differentiation of hematopoietic stem cells. Genetic mutation of GATA2 can be a cause of GATA2 deficiency syndrome, and its severe case shows T cell development impairments, suggesting the notion that GATA2 might possess important roles for T cell development. However, still little is known about the roles of GATA2 in T cell development. In this study, we sought to reveal the roles of GATA2 in T cell development. We found that the earliest T cell progenitors in the thymus express GATA2 at a comparable level of lymphoid progenitors in the bone marrow. Taking advantage of comprehensive transcriptomic analysis and open chromatin analysis revealed that GATA2 might possess significant roles in the earliest T cell progenitors in the thymus to regulate its survival and differentiation potentials.

Academic Significance and Societal Importance of the Research Achievements

今回の研究から、これまで不明な点の多かった、T細胞の初期分化における、造血幹細胞のマスター転写因子GATA2の働きの一端が明らかとなった。特に、胸腺における最も未熟な細胞をGATA2の発現量に基づいて規定できる可能性があると同時に、この細胞こそが自然免疫細胞と獲得免疫細胞の最終分化の分岐点である可能性が考えられ、造血における細胞の運命決定機構を理解する上で、今後欠かせない発見であると考えられる。

Report

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

    (1 results)

All 2023

All Presentation (1 results) (of which Int'l Joint Research: 1 results)

  • [Presentation] Transcription Factor GATA2 Is Inevitable for the Survival and Proper Differentiation of Thymic Multipotent Progenitor Cells By Gene Expression Orchestration2023

    • Author(s)
      Sayaka Sano, Hiroki Kato, Yan Yan, Eijiro Furukawa, Daigo Michimata, Yuya Tanaka, Kazuki Sakurai, Koichi Onodera, Satoshi Ichikawa, Noriko Fukuhara, Yasushi Onishi, Hisayuki Yokoyama, Tohru Fujiwara, Hideo Harigae.
    • Organizer
      第65回米国血液学会
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research

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Published: 2022-07-05   Modified: 2025-01-30  

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