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Functional analysis of SAMD9/9L mutations in hematopoiesis and generation of a novel humanized SAMD9/9L mouse model

Research Project

Project/Area Number 21K08395
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 54010:Hematology and medical oncology-related
Research InstitutionHiroshima University

Principal Investigator

Nagamachi Akiko  広島大学, 原爆放射線医科学研究所, 助教 (20585153)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2023: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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)
Keywords骨髄異形成症候群 / SAMD9/9L症候群 / MDS / Samd9/9L症候群 / Samd9/9L
Outline of Research at the Start

7q欠失型の骨髄異形成症候群(MDS)の責任遺伝子であるSamd9とSamd9L(Samd9/9L)は、機能獲得型の変異により、非常に稀な幼児の7q欠失型MDSが多発する「Samd9/9L症候群」を引き起こす。本研究では、樹立したSamd9/9L症候群モデルマウスとSamd9L欠損マウスの造血幹細胞や造血微小環境の特性について、サイトカイン代謝能の視点から検証し、Samd9/9L変異体の造血に与える影響とその分子メカニズムを明らかにする。さらに、ヒト様のSamd9/9Lを有する新規モデルマウスの作製に着手する。

Outline of Final Research Achievements

Samd9 and Samd9L (Samd9/9L) are located in 7q and are genes responsible for 7q-/MDS. "Samd9/9L syndromes" are a currently established large subgroup of the inherited BM failure (IBMF) syndromes. Patients with Samd9/9L syndromes carry a gain-of-function mutation in the Samd9/9L genes. We established mice carrying a Samd9LD764N g/f mutation that exhibit IBMF. Evaluation of hematopoietic function in the Samd9L mutated mouse revealed significant reduction in lymphocytes due to differentiation defects of B cells from the Pro-B cell stage onward, along with accelerated cell cycle progression in hematopoietic stem cells. Furthermore, abnormalities in TGFβ signaling mediated by Samd9L mutations were identified in hematopoietic stem cells.

Academic Significance and Societal Importance of the Research Achievements

SAMD9/9L症候群は2016年頃より提唱された新しい疾患概念で、現在は先天性骨髄不全症のカテゴリーの中でファンコニー貧血と並ぶ代表的疾患となったが、疾患原因となるSamd9/9L変異体の生化学的機能は未だ不明な状況にある。今回得られた結果は、症候群の発症メカニズム解明に向けた第一歩であり、加えて、SAMD9/9Lの機能亢進と機能低下による病態解析を通じて、造血幹細胞を中心とする造血系におけるTGFβの機能に対する新たな知見となった。

Report

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

    (11 results)

All 2024 2023 2022 2021

All Journal Article (7 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 7 results,  Open Access: 7 results) Presentation (4 results)

  • [Journal Article] Application of prime editing system to introduce P53 R248Q hotspot mutation in acute lymphoblastic leukemia cell line2024

    • Author(s)
      Nguyen Thao、Aida Tomomi、Iijima‐Yamashita Yuka、Tamai Minori、Nagamachi Akiko、Kagami Keiko、Komatsu Chiaki、Kasai Shin、Akahane Koshi、Goi Kumiko、Inaba Toshiya、Sanada Masashi、Inukai Takeshi
    • Journal Title

      Cancer Science

      Volume: - Issue: 6 Pages: 0-0

    • DOI

      10.1111/cas.16162

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Ribosome profiling analysis reveals the roles of DDX41 in translational regulation2023

    • Author(s)
      Tungalag Saruul、Shinriki Satoru、Hirayama Mayumi、Nagamachi Akiko、Kanai Akinori、Inaba Toshiya、Matsui Hirotaka
    • Journal Title

      International Journal of Hematology

      Volume: - Issue: 6 Pages: 1-13

    • DOI

      10.1007/s12185-023-03558-2

    • Related Report
      2023 Annual Research Report 2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] DDX41 coordinates RNA splicing and transcriptional elongation to prevent DNA replication stress in hematopoietic cells2022

    • Author(s)
      Satoru Shinriki;Mayumi Hirayama;Akiko Nagamachi;Akihiko Yokoyama;Takeshi Kawamura;Akinori Kanai;Hidehiko Kawai;Junichi Iwakiri;Rin Liu;Manabu Maeshiro;Saruul Tungalag;Masayoshi Tasaki;Mitsuharu Ueda;Kazuhito Tomizawa;Naoyuki Kataoka;Takashi Ideue;Yutaka Suzuki;Kiyoshi Asai;Tokio Tani;Toshiya Inaba;Hirotaka Matsui
    • Journal Title

      Leukemia

      Volume: 36 Issue: 11 Pages: 2605-2620

    • DOI

      10.1038/s41375-022-01708-9

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Mouse models of hematological diseases using genome editing technology2022

    • Author(s)
      長町 安希子、稲葉 俊哉
    • Journal Title

      Rinsho Ketsueki

      Volume: 63 Issue: 11 Pages: 1551-1557

    • DOI

      10.11406/rinketsu.63.1551

    • ISSN
      0485-1439, 1882-0824
    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] UTX maintains functional integrity of murine hematopoietic system by globally regulating aging-associated genes.2021

    • Author(s)
      Sera Y; Nakata Y; Ueda T; Yamasaki N; Koide S; Kobayashi H; Ikeda KI; Kobatake K; Iwasaki M; Oda H; Wolff L; Kanai A; Nagamachi A; Inaba T; Sotomaru Y; Ichinohe T; Koizumi M; Miyakawa Y; Honda ZI; Iwama A; Suda T; Takubo K; Honda H
    • Journal Title

      Blood.

      Volume: 137 Issue: 7 Pages: 908-922

    • DOI

      10.1182/blood.2019001044

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Multi-organ failure with abnormal receptor metabolism in mice mimicking Samd9/9L syndromes2021

    • Author(s)
      Nagamachi A, Kanai A, Nakamura M, Okuda H, Yokoyama A, Shinriki S, Matsui H, Inaba T.
    • Journal Title

      J Clin Invest

      Volume: 131 Issue: 4 Pages: 1-16

    • DOI

      10.1172/jci140147

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Revertant somatic mosaicism as a cause of cancer2021

    • Author(s)
      Inaba Toshiya、Nagamachi Akiko
    • Journal Title

      Cancer Science

      Volume: 112 Issue: 4 Pages: 1383-1389

    • DOI

      10.1111/cas.14852

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] IBMF-causative Samd9/9L mutations increase cycling-HSC by disturbing TGFb signal transduction2023

    • Author(s)
      Akiko Nagamachi, Akinori Kanai, Hirotaka Matsui, Satoru Shinriki, Tomokatsu Ikawa, Toshiya Inaba
    • Organizer
      第85回日本血液学会学術総会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Dysregulation of TGF-beta autocrine signals by a bone marrow failure-causative Samd9L mutant.2022

    • Author(s)
      Akiko Nagamachi, Akinori Kanai, Hirotaka Matsui, Satoru Shinriki, Tomokatsu Ikawa, Toshiya Inaba
    • Organizer
      第84回日本血液学会学術総会
    • Related Report
      2022 Research-status Report
  • [Presentation] Involvement of IFNγ in the development of 7q-/MDS in patients with SAMD9/9L syndromes2021

    • Author(s)
      Akiko Nagamachi, Hirotaka Matsui, Akinori Kanai, Satoru Shinriki, and Toshiya Inaba
    • Organizer
      第80回日本癌学会学術総会
    • Related Report
      2021 Research-status Report
  • [Presentation] Involvement of IFNγ in the development of 7q-/MDS in patients with SAMD9/9L syndromes2021

    • Author(s)
      Akiko Nagamachi, Hirotaka Matsui, Akinori Kanai, Satoru Shinriki, and Toshiya Inaba
    • Organizer
      第83回日本血液学会学術総会
    • Related Report
      2021 Research-status Report

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

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