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A role of MYCN in neurodevelopment and in a novel syndrome

Research Project

Project/Area Number 18K19524
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 52:General internal medicine and related fields
Research InstitutionNagoya City University

Principal Investigator

Saitoh Shinji  名古屋市立大学, 医薬学総合研究院(医学), 教授 (00281824)

Co-Investigator(Kenkyū-buntansha) 大石 久史  名古屋市立大学, 医薬学総合研究院(医学), 教授 (30375513)
永田 浩一  愛知県医療療育総合センター発達障害研究所, 分子病態研究部, 部長 (50252143)
Project Period (FY) 2018-06-29 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2019: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2018: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Keywords巨脳症 / 脳形成 / MYCN / 神経発生
Outline of Final Research Achievements

We identified a novo c.173C>T mutation in MYCN which leads to stabilization and accumulation of the MYCN protein, leading to prolonged CCND1 and CCND2 expression. This may promote neurogenesis in the developing cerebral cortex, leading to megalencephaly. While loss-of-function mutations in MYCN are known to cause microcephaly, we for the first time uncovered that a germline gain-of-function mutation in MYCN causes a novel megalencephaly syndrome. Additionally, we successfully generated knock-in mice of the identified mutation in MYCN using the CRISPR/Cas9 technology. Our findings provide new insight into the critical role of MYCN in brain development, as well as the consequences of MYCN defects.

Academic Significance and Societal Importance of the Research Achievements

MYCNはがん遺伝子、また、脳発生における役割について知られている。MYCN遺伝子の機能喪失型変異が小頭症を示すことも知られていた。しかし、MYCN遺伝子の機能亢進型変異についての知見はこれまで存在しなかった。私たちは世界に先駆けてMYCN遺伝子のミスセンス変異を巨脳症患者に同定した。この変異の機能解析を細胞レベル、神経幹細胞/前駆細胞レベル、発生期のマウス脳レベルで解析し、機能亢進型変異であることを証明した。更に、変異を導入したノックインマウスの作成に成功した。本研究はMYCN遺伝子の適切な発現調整が正常な脳形成に必須であることを証明し、脳の大きさ制御のメカニズム解明に資する意義がある。

Report

(3 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • Research Products

    (14 results)

All 2019 2018

All Journal Article (7 results) (of which Peer Reviewed: 7 results,  Open Access: 5 results) Presentation (7 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results)

  • [Journal Article] Schaaf-Yang syndrome shows a Prader-Willi syndrome-like phenotype during infancy2019

    • Author(s)
      Negishi Yutaka、Ieda Daisuke、Hori Ikumi、Nozaki Yasuyuki、Yamagata Takanori、Komaki Hirofumi、Tohyama Jun、Nagasaki Keisuke、Tada Hiroko、Saitoh Shinji
    • Journal Title

      Orphanet Journal of Rare Diseases

      Volume: 14 Issue: 1 Pages: 277-277

    • DOI

      10.1186/s13023-019-1249-4

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] A novel CUL4B splice site variant in a young male exhibiting less pronounced features2019

    • Author(s)
      Nakamura Yuji、Okuno Yusuke、Muramatsu Hideki、Kawai Tomoko、Satou Kazuhito、Ieda Daisuke、Hori Ikumi、Ohashi Kei、Negishi Yutaka、Hattori Ayako、Takahashi Yoshiyuki、Kojima Seiji、Saitoh Shinji
    • Journal Title

      Human Genome Variation

      Volume: 6 Issue: 1 Pages: 43-43

    • DOI

      10.1038/s41439-019-0074-6

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Constitutive activation of mTORC1 signaling induced by biallelic loss-of-function mutations in SZT2 underlies a discernible neurodevelopmental disease2019

    • Author(s)
      Nakamura Yuji、Kato Kohji、Tsuchida Naomi、Matsumoto Naomichi、Takahashi Yoshiyuki、Saitoh Shinji
    • Journal Title

      PLOS ONE

      Volume: 14 Issue: 8 Pages: e0221482-e0221482

    • DOI

      10.1371/journal.pone.0221482

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Transition from Leigh syndrome to MELAS syndrome in a patient with heteroplasmic MT-ND3 m.10158T>C2019

    • Author(s)
      Kori Atsuko、Hori Ikumi、Tanaka Tatsushi、Aoyama Kohei、Ito Koichi、Hattori Ayako、Ban Kyoko、Okazaki Yasushi、Murayama Kei、Saitoh Shinji
    • Journal Title

      Brain and Development

      Volume: 41 Issue: 9 Pages: 803-807

    • DOI

      10.1016/j.braindev.2019.05.006

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A novel splicing mutation in SLC9A6 in a boy with Christianson syndrome2019

    • Author(s)
      Ieda Daisuke、Hori Ikumi、Nakamura Yuji、Ohashi Kei、Negishi Yutaka、Hattori Ayako、Arisaka Atsuko、Hasegawa Setsuko、Saitoh Shinji
    • Journal Title

      Human Genome Variation

      Volume: 6 Issue: 1 Pages: 15-15

    • DOI

      10.1038/s41439-019-0046-x

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] MYCN de novo gain-of-function mutation in a patient with a novel megalencephaly syndrome2019

    • Author(s)
      Kato Kohji、Miya Fuyuki、Hamada Nanako、Negishi Yutaka、Narumi-Kishimoto Yoko、Ozawa Hiroshi、Ito Hidenori、Hori Ikumi、Hattori Ayako、Okamoto Nobuhiko、Kato Mitsuhiro、Tsunoda Tatsuhiko、Kanemura Yonehiro、Kosaki Kenjiro、Takahashi Yoshiyuki、Nagata Koh-ichi、Saitoh Shinji
    • Journal Title

      Journal of Medical Genetics

      Volume: 印刷中 Issue: 6 Pages: 388-395

    • DOI

      10.1136/jmedgenet-2018-105487

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Distinctive facies, macrocephaly, and developmental delay are signs of a PTEN mutation in childhood2018

    • Author(s)
      Kato Kohji、Mizuno Seiji、Inaba Mie、Fukumura Shinobu、Kurahashi Naoko、Maruyama Koichi、Ieda Daisuke、Ohashi Kei、Hori Ikumi、Negishi Yutaka、Hattori Ayako、Saitoh Shinji
    • Journal Title

      Brain and Development

      Volume: 40 Issue: 8 Pages: 678-684

    • DOI

      10.1016/j.braindev.2018.04.008

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] Clinical, genetic, and biochemical analyses for PI3K-AKT-mTOR pathway-associated megalencephaly.2019

    • Author(s)
      Hori I, Miya F, Nakamura Y, Ieda D, Negishi Y, Hattori A, Tsunoda T, Kanemura Y, Kosaki K, Saitoh S
    • Organizer
      第61回日本小児神経学会学術集会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Altered mTOR signaling in patients with SZT2-related neurological disease.2019

    • Author(s)
      Nakamura Y, Tsuchida N, Kato K, Ieda D, Hori I, Hattori A, Matsumoto N, Saitoh S
    • Organizer
      第61回日本小児神経学会学術集会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Constitutive activation of mTORC1 signaling induced by biallelic loss-of-function mutations in SZT2 underlies a discernible neurodevelopmental disease.2019

    • Author(s)
      Nakamura Y, Kato K, Tsuchida N, Matsumoto N, Takahashi Y, Saitoh S
    • Organizer
      69th American Society of Human Genetics Annual Meeting
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Biallelic VPS35L pathogenic variants cause 3C/Ritscher-Schinzel-like syndrome through dysfunction of retriever complex.2019

    • Author(s)
      Kato K, Oka Y, Muramatsu H, Vasilev F, Otomo T, Oishi H, Kawano Y, Nakazawa Y, Ogi T, Takahashi Y, Saitoh S
    • Organizer
      Biallelic VPS35L pathogenic variants cause 3C/Ritscher-Schinzel-like syndrome through dysfunction of retriever complex.
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] MYCNの新生機能獲得型変異は新規の巨脳症症候群の原因となる Authors2018

    • Author(s)
      加藤耕治、宮冬樹、浜田奈菜子、根岸豊、岸本洋子、小沢弘、伊藤英則、堀いくみ、服部文子、岡本信彦、加藤光広、角田達彦、金村米博、小崎健次郎、高橋義行、永田浩一、齋藤伸治
    • Organizer
      第63回日本人類遺伝学会
    • Related Report
      2018 Research-status Report
  • [Presentation] A de novo gain-of-function mutation in MYCN causes a novel megalencephaly syndrome2018

    • Author(s)
      Kohji Kato1,2, Fuyuki Miya3,4, Nanako Hamada5, Yutaka Negishi1, Yoko Narumi-Kishimoto 6, Hiroshi Ozawa6, Hidenori Ito5, Ikumi Hori1, Ayako Hattori1, Nobuhiko Okamoto7, Mitsuhiro Kato8, Tatsuhiko Tsunoda3,4, Yonehiro Kanemura9,10, Kenjiro Kosaki11, Yoshiyuki Takahashi2, Koh-ichi Nagata5, Shinji Saitoh
    • Organizer
      Annual Meeting of American Society of Human Genetics 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] PI3K-AKT-mTOR経路が関連する巨脳症2018

    • Author(s)
      齋藤伸治
    • Organizer
      第60回日本小児神経学会
    • Related Report
      2018 Research-status Report
    • Invited

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Published: 2018-07-25   Modified: 2021-02-19  

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