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Elucidation of the pathogenesis of adult T-cell leukemia using chromatin structural data at various levels of hematopoietic differentiation

Research Project

Project/Area Number 19K16740
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 50010:Tumor biology-related
Research InstitutionThe University of Tokyo

Principal Investigator

Tanaka Azusa  東京大学, 大学院医学系研究科(医学部), 特別研究員 (70749796)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords成人T細胞白血病ウイルス / エピゲノム / 成人T細胞白血病 / クロマチン / ATAC-seq / クロマチン構造
Outline of Research at the Start

成人T細胞白血病(ATL) は、ヒトT細胞白血病ウイルス(HTLV-1) の感染により発症する難治性のT細胞悪性腫瘍である。
ATL細胞の由来はCD4陽性メモリー細胞と考えられてるが、その細胞分画とは異なる細胞形質も有している。どのような経路を経てATLが発症したのか、細胞の過去の状態、現在、未来の運命決定を説明するには遺伝子発現だけでなく、エピゲノムの情報が必須である。本研究ではATLのクロマチンデータとデータベース上に蓄積された様々な血球分画のクロマチンデータを詳細に比較解析することで、感染細胞がどのような経路でATL発症へと至るのかを推定し、実験的に検証し解明する。

Outline of Final Research Achievements

Human T-cell leukemia virus type 1 (HTLV-1) causes adult T-cell leukemia-lymphoma (ATL). The leukemic cells typically have a CD4+ memory T cell phenotype, but the mechanisms underlying this process are not presently understood. To clarify the mechanism of leukemia development, we focused on the chromatin structure, which is a central mechanism of cell regulation, and investigated the characteristics of ATL cells. We first developed a method for comparative analysis between samples. Next, we analyzed the chromatin accessibility landscape of HTLV-1-infected cells from ATL cases by comparing the ATAC-seq data with those from 13 types of hematopoietic cells from healthy donors using this method. It was found that in some cases, although ATL is a T-cell leukemia, the chromatin structure resembled to that of myeloid cells, suggesting the possibility of the existence of "T-cell leukemia cells with traits similar to those of myeloid cells".

Academic Significance and Societal Importance of the Research Achievements

HTLV-1は母子感染するレトロウイルスで、数千年前から人類と共存してきた。感染者の90%は無症候のまま健康状態を保っているが、感染者の5%は成人T細胞白血病 (ATL) として知られる難治性の白血病やリンパ腫を発症する。HTLV-1は造血幹細胞を含め様々な細胞に感染し、さらに感染を維持したまま分化することが報告されているが、ATL発症メカニズムの関しては未だ不明な点も多い。本研究課題では健常人由来の細胞とのクロマチン構造の比較解析により、T細胞以外の要素を有するATL症例の存在が示唆された。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (4 results)

All 2021 2020 2019

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 3 results) Presentation (1 results)

  • [Journal Article] Whole genome sequencing with long-reads reveals complex structure and origin of structural variation in human genetic variations and somatic mutations in cancer.2021

    • Author(s)
      Fujimoto A, Wong JH, Yoshii Y, Akiyama S, Tanaka A, Yagi H, Shigemizu D, Nakagawa H, Mizokami M, and Shimada M.
    • Journal Title

      Genome Medicine

      Volume: 13 Issue: 1 Pages: 65-65

    • DOI

      10.1186/s13073-021-00883-1

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Systematic clustering algorithm for chromatin accessibility data and its application to hematopoietic cells2020

    • Author(s)
      Tanaka Azusa、Ishitsuka Yasuhiro、Ohta Hiroki、Fujimoto Akihiro、Yasunaga Jun-ichirou、Matsuoka Masao
    • Journal Title

      PLOS Computational Biology

      Volume: 16 Issue: 11 Pages: e1008422-e1008422

    • DOI

      10.1371/journal.pcbi.1008422

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Identification of intermediate-sized deletions and inference of their impact on gene expression in a human population.2019

    • Author(s)
      Wong JH, Shigemizu D, Yoshii Y, Akiyama S, Tanaka A, Nakagawa H, Narumiya S, Fujimoto A
    • Journal Title

      Genome Medicine

      Volume: 11 Issue: 1 Pages: 44-44

    • DOI

      10.1186/s13073-019-0656-4

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 成人T細胞白血病細胞のクロマチン構造解析2019

    • Author(s)
      田中梓、安永純一朗、藤本明洋、松岡雅雄
    • Organizer
      第5回日本HTLV-1学会学術集会
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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