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Elucidation of the pathophysiology of Leber's congenital amaurosis using genome editing technology

Research Project

Project/Area Number 19K18878
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 56060:Ophthalmology-related
Research InstitutionOkayama University

Principal Investigator

Hosokawa Mio  岡山大学, 大学病院, 助教 (00711053)

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: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywordsレーバー先天黒内障 / KCNJ13遺伝子 / ゲノム編集 / アポトーシス / ネクローシス / 走査型電子顕微鏡
Outline of Research at the Start

網膜ジストロフィは重篤な視力障害を来す眼疾患であり、現在有効な治療法はない。その一型であるレーバー先天黒内障16型(Leber’s congenital amaurosis type16 以下LCA-16)ではイオンチャネルKir7.1をコードするKCNJ13遺伝子に異常があり、KCNJ13遺伝子は眼の網膜色素上皮(以下RPE)細胞に多く発現していることが知られている。しかしKCNJ13遺伝子がRPEや網膜を含む眼球全体に及ぼす影響には不明な点が多い。そこで本研究ではゲノム編集技術を用いてLCAの病態を明らかにし、治療法開発の基盤となる研究を行う。

Outline of Final Research Achievements

Leber’s congenital amaurosis type 16 (LCA-16) is a retinal dystrophy caused by an abnormality in the KCNJ13 gene expressed in retinal pigment epithelial cells (RPE), and its disease mechanism is largely unknown. In this study, we created an LCA-16 model RPE in which the KCNJ13 gene was knocked out using genome editing technology. The obtained model cells were evaluated for cell morphology using a phase-contrast microscope and immunostaining, observed with a transmission electron microscope and a scanning electron microscope, and their phagocytic ability was evaluated. In the LCA-16 model RPE, some cells had misalignment, significantly more cells were killed, and phagocytosis was reduced.
It was suggested that abnormalities in the cell sequence of RPE and decreased function may be involved in the pathophysiology of LCA-16.

Academic Significance and Societal Importance of the Research Achievements

レーバー先天黒内障16型(LCA-16)は重篤な視力障害を来す眼疾患である網膜ジストロフィの一型であるが、その疾患メカニズムは不明な点が多く、現在有効な治療法はない。
本研究ではLCA-16モデルの網膜色素上皮細胞(RPE)を作成し、細胞形態や貪食能などの評価を行った結果、RPEの細胞配列の異常や機能低下がLCA-16の病態に関与している可能性が示唆された。LCAの病態が明らかになることは、治療法のない疾患であるLCA-16治療法開発の基盤となる可能性がある。

Report

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

    (2 results)

All 2020

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

  • [Journal Article] KCNJ13 Gene Deletion Impairs Cell Alignment and Phagocytosis in Retinal Pigment Epithelium Derived from Human-Induced Pluripotent Stem Cells2020

    • Author(s)
      Kanzaki Yuki、Fujita Hirofumi、Sato Keita、Hosokawa Mio、Matsumae Hiroshi、Shiraga Fumio、Morizane Yuki、Ohuchi Hideyo
    • Journal Title

      Investigative Opthalmology & Visual Science

      Volume: 61 Issue: 5 Pages: 38-38

    • DOI

      10.1167/iovs.61.5.38

    • NAID

      120006869576

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] KCNJ13 gene deletion impairs phagocytosis in retinal pigment epithelium derived from human-induced pluripotent stem cells.2020

    • Author(s)
      Yuki Kanzaki; Hirofumi Fujita; Keita Sato; Mio Hosokawa; Hiroshi Matsumae; Fumio Shiraga; Yuki Morizane; Hideyo Ohuchi
    • Organizer
      ARVO Annual Meeting 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research

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

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