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Elucidation of pathophysiology in neural dysfunction of Down syndrome for the drug discovery

Research Project

Project/Area Number 19H03619
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 52050:Embryonic medicine and pediatrics-related
Research InstitutionOsaka University

Principal Investigator

Kitabatake Yasuji  大阪大学, 医学部附属病院, 准教授 (80506494)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥14,820,000 (Direct Cost: ¥11,400,000、Indirect Cost: ¥3,420,000)
Fiscal Year 2021: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2020: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2019: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Keywordsダウン症候群 / iPS細胞 / ゲノム編集技術 / ゲノム編集 / アストロサイト / エピジェネティック編集技術 / 染色体異常
Outline of Research at the Start

ダウン症候群では多彩な神経症状が見られる。21番染色体の‘遺伝子量効果’がその原因と考えられてきたが、その効果をさらに修飾する強い病的作用が存在すると思われる。本研究課題では『ダウン症候群に見られる中枢神経系の病態は‘21番染色体の遺伝子量効果’と‘すべての染色体に共通のストレス作用’の両者が複雑に作用することによって発症する』という仮説をもとに、iPS細胞にゲノム編集技術を駆使することでダウン症モデルを樹立し、その中枢神経障害に対する病態解明と治療薬開発を目指す。

Outline of Final Research Achievements

Individuals with Down syndrome (DS) commonly show various neurological phenotypes. Besides the specific effects of dosage-sensitive genes on chromosome 21, recent studies have demonstrated that the gain of a chromosome exerts an adverse impact on cell physiology, regardless of the karyotype. In this study, we investigated cellular stress responses in human trisomy 21 and 13 neurons differentiated from patient-derived induced pluripotent stem cells. Neurons of both trisomies showed increased vulnerability to apoptotic cell death, accompanied by dysregulated protein homeostasis. On the other hand, we established a human isogenic cell line panel based on DS-specific induced pluripotent stem cells, the XIST-mediated transcriptional silencing system in trisomic chromosome 21, and genome/chromosome-editing technologies. Comparative analysis and experimental verification using gene modification reveal dose-dependent proliferation-promoting activity of DYRK1A on DS APCs.

Academic Significance and Societal Importance of the Research Achievements

ダウン症候群は700人に1人と高い発症頻度であり、知的障害をもたらす遺伝性疾患では最多である。さらに50年前にはダウン症者の平均寿命は約3歳であったにもかかわらず、医療の進歩により現在では約60歳であり、この50年間で50年以上伸びた。この急激な変化により、これまで気付かれなかった成人期の認知障害が近年大きな問題として浮かび上がってきているがその研究はまったく進まず治療法もない。本研究課題においてえられる成果は、これまであまり顧みられなかったダウン症候群の臨床を前進させ、患者本人のみならずその両親・介護者の日常生活の向上に大きく役立つと期待される。

Report

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

    (3 results)

All 2021 2020 2019

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

  • [Journal Article] A human isogenic iPSC-derived cell line panel identifies major regulators of aberrant astrocyte proliferation in Down syndrome2021

    • Author(s)
      Kawatani Keiji、Nambara Toshihiko、Nawa Nobutoshi、Yoshimatsu Hidetaka、Kusakabe Haruna、Hirata Katsuya、Tanave Akira、Sumiyama Kenta、Banno Kimihiko、Taniguchi Hidetoshi、Arahori Hitomi、Ozono Keiichi、Kitabatake Yasuji
    • Journal Title

      Communications Biology

      Volume: 4 Issue: 1 Pages: 730-730

    • DOI

      10.1038/s42003-021-02242-7

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] 4-Phenylbutyrate ameliorates apoptotic neural cell death in Down syndrome by reducing protein aggregates2020

    • Author(s)
      Hirata Katsuya、Nambara Toshihiko、Kawatani Keiji、Nawa Nobutoshi、Yoshimatsu Hidetaka、Kusakabe Haruna、Banno Kimihiko、Nishimura Ken、Ohtaka Manami、Nakanishi Mahito、Taniguchi Hidetoshi、Arahori Hitomi、Wada Kazuko、Ozono Keiichi、Kitabatake Yasuji
    • Journal Title

      Scientific Reports

      Volume: 10 Issue: 1 Pages: 14047-14047

    • DOI

      10.1038/s41598-020-70362-x

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Elimination of protein aggregates prevents premature senescence in human trisomy 21 fibroblasts2019

    • Author(s)
      Nawa Nobutoshi、Hirata Katsuya、Kawatani Keiji、Nambara Toshihiko、Omori Sayaka、Banno Kimihiko、Kokubu Chikara、Takeda Junji、Nishimura Ken、Ohtaka Manami、Nakanishi Mahito、Okuzaki Daisuke、Taniguchi Hidetoshi、Arahori Hitomi、Wada Kazuko、Kitabatake Yasuji、Ozono Keiichi
    • Journal Title

      PLOS ONE

      Volume: 14 Issue: 7 Pages: 0219592-0219592

    • DOI

      10.1371/journal.pone.0219592

    • NAID

      120007133008

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access

URL: 

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

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