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PIGB maintains nuclear lamina organization in skeletal muscle of Drosophila

Research Project

Project/Area Number 20K06629
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 44010:Cell biology-related
Research InstitutionRikkyo University

Principal Investigator

Yamamoto-hino Miki  立教大学, 理学部, 特定課題研究員 (40301783)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2022: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2020: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywords核ラミナ / ラミン / クロマチン / 核の脆弱性 / 核膜蛋白質 / 骨格筋 / GPIアンカー蛋白質
Outline of Research at the Start

核膜は、細胞質と核を隔てる細胞内膜構造であるが、ここに局在する蛋白質は、細胞質と核内の情報のやりとりや、遺伝子発現調節など様々な事象をオーガナイズしている。私達はショウジョウバエ骨格筋において、核膜が正常に機能するために必須と考えられる、新しい分子PIG-Bを発見した。そこで本研究ではショウジョウバエPIG-B変異体を用いて、分子レベル、細胞レベル、個体レベルでどのような異常が生じているか、検討を行う。本研究によって、核膜の機能に必要な新しい分子メカニズムが明らかになり、骨格筋の形成や維持における核膜の重要性に新たな知見をもたらすことが期待できる。

Outline of Final Research Achievements

The nuclear lamina (NL) plays various roles and participates in nuclear integrity, chromatin organization, and transcriptional regulation. Lamin proteins, the main components of the NL, form a homogeneous meshwork structure under the nuclear envelope. We found that PIGB, an enzyme involved in glycosylphosphatidylinositol (GPI) synthesis, is responsible for the homogeneous lamin meshwork in Drosophila. Loss of PIGB resulted in heterogeneous distributions of B-type lamin and lamin-binding proteins in larval muscles. These phenotypes were rescued by expression of PIGB lacking GPI synthesis activity. The PIGB mutant exhibited changes of lamina-associated domains that are large heterochromatic genomic regions in the NL and deformation of muscle fibers. These results suggest that PIGB maintains the homogeneous meshwork of the NL, which may be essential for chromatin distribution and nuclear mechanical properties.

Academic Significance and Societal Importance of the Research Achievements

これまでにラミンの分布を制御する因子は見つかっておらず、PIGBは初めての報告である。ラミンが均一な網目構造をとることの意義は不明であったが、本研究によって、核膜蛋白質の正常な分布やクロマチンの構造の維持に必要であることを示すことができた。さらにその異常は核膜の堅牢性や遺伝子発現などにも影響を与え、ラミンの均一な網目構造は核が適切に機能を発揮するために重要であることが示唆された。さらに変異ラミンによって引き起こされる核膜病の理解に発展する可能性を示すことができた。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (6 results)

All 2022 2021

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

  • [Journal Article] Hrd1-dependent Degradation of the Unassembled PIGK Subunit of the GPI Transamidase Complex2021

    • Author(s)
      Kawaguchi Kohei、Yamamoto-Hino Miki、Murakami Yoshiko、Kinoshita Taroh、Goto Satoshi
    • Journal Title

      Cell Structure and Function

      Volume: 46 Issue: 2 Pages: 65-71

    • DOI

      10.1247/csf.21019

    • NAID

      130008083701

    • ISSN
      0386-7196, 1347-3700
    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] SPPL3-dependent downregulation of the synthesis of (neo)lacto-series glycosphingolipid is required for the staining of cell surface CD592021

    • Author(s)
      Kawaguchi Kohei、Yamamoto-Hino Miki、Goto Satoshi
    • Journal Title

      Biochemical and Biophysical Research Communications

      Volume: 571 Pages: 81-87

    • DOI

      10.1016/j.bbrc.2021.06.093

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Subunits of the GPI transamidase complex localize to the endoplasmic reticulum and nuclear envelope in Drosophila2021

    • Author(s)
      Kawaguchi Kohei、Yamamoto‐Hino Miki、Matsuyama Nina、Suzuki Emiko、Goto Satoshi
    • Journal Title

      FEBS Letters

      Volume: 595 Issue: 7 Pages: 960-968

    • DOI

      10.1002/1873-3468.14048

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] ショウジョウバエ骨格筋の核ラミナの組織化は、PIGBによって維持されている2022

    • Author(s)
      山本(日野)美紀
    • Organizer
      第45回 日本分子生物学会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 核ラミンの均一なメッシュワークの形成とその機能2021

    • Author(s)
      後藤 聡
    • Organizer
      日本分子生物学会
    • Related Report
      2021 Research-status Report
  • [Presentation] 核膜の恒常性を維持する新しい分子の発見2021

    • Author(s)
      Miki Yamamot-Hino, Kohei Kawaguchi, Satoshi Goto
    • Organizer
      日本細胞生物学会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2024-01-30  

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