• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

A research for the diagnosis of RYR2-positive LQTS and its arrhythmogenicity

Research Project

Project/Area Number 20K17146
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 53020:Cardiology-related
Research InstitutionShiga University of Medical Science

Principal Investigator

Fujii Yusuke  滋賀医科大学, 医学部, 助教 (10837868)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
KeywordsRYR2 / CALM / CPVT / LQTS / カテコラミン誘発性多形心室頻拍 / 先天性QT延長症候群 / カルモジュリン / リアノジン受容体 / QT延長症候群 / QT延長 / RYR2変異 / カテコラミン誘発多形性心室頻拍 / 心筋リアノジン受容体
Outline of Research at the Start

カテコラミン誘発性多形性心室頻拍 (CPVT) は、若年者に運動時の不整脈突然死を起こす重篤な疾患で、主な原因は心筋のリアノジン受容体遺伝子(RYR2)の変異である。CPVT患者の一部ではQT時間の延長を認めており、 は学童期に運動中の失神をきたす点が先天性QT 延長症候群 (LQTS) 1型と共通しているが、治療法が異なるため、鑑別が必要になる。本研究では、LQTS患者とQT延長合併CPVT患者を比較し、両者の臨床像を明らかにする。さらにQT延長を来すRYR2変異の機能を調べ、QT延長を起こすメカニズムを解明する。これらを通じて、CPVTの診断効率を改善し、若年者突然死をなくすことを目指す。

Outline of Final Research Achievements

Initially, we planned to compare CPVT1 patients with QT prolongation with LQTS patients. However, because of the insufficient patient number, we extended our analysis to CPVT2(CALM) patients and CALM related LQTS patients. By the analysis of CALM-LQTS patients, we found 6 variants in 9 patients Among 322 children in calmodulin-encoded genes (2.8%) Their clinical diagnoses were LQTS (n=4), CPVT (n=3), and both (n=2). Their age of diagnosis ranges at 0-9 with the median of 5 years. There were three major clinical phenotypes; 1) CALM2-D96V, and E141K: two infants with advanced atrio-ventricular block, significant QTc prolongation, severe heart failure from their fetal period; both of them deceased within 1.5-year-old. Their phenotypes seemed to be mutation specific. Their cardiac features were severer, and the onset of LAEs was earlier compared with other genotypes of LQTS/CPVT.
We reported these findings in the scientific meeting, European Society of Cardiology 2022.

Academic Significance and Societal Importance of the Research Achievements

CPVT/ CALM関連LQTSは重症度の高い遺伝性不整脈疾患であるが、その頻度が少ないこともあり、特にCPVTに対しての遺伝子検査が保険適応となっていないなど、医療における対応はいまだ発展途上である。本研究を通して、国内におけるCPVT, CALM関連LQTSの病態についてより理解が進むことが期待される。特に、乳幼児期に致死性不整脈が多いという知見は重要なメッセージであり、これらのエビデンスを国内症例で蓄積することで、今後のCPVTに遺伝子検査保険適応導入などのアウトカムにつなげていけることが期待される。

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

All Journal Article (1 results) Presentation (5 results)

  • [Journal Article] Successful Management of a Young Athlete with Type 2 Long QT Syndrome by Genotype-specific Risk Stratification and Bridging Therapy with a Wearable Cardioverter Defibrillator2022

    • Author(s)
      Kojima Katsumi、Kato Koichi、Fujii Yusuke、Okuyama Yusuke、Ohno Seiko、Ozawa Tomoya、Horie Minoru、Nakagawa Yoshihisa
    • Journal Title

      Internal Medicine

      Volume: 61 Issue: 8 Pages: 1179-1182

    • DOI

      10.2169/internalmedicine.8093-21

    • NAID

      130008150341

    • ISSN
      0918-2918, 1349-7235
    • Year and Date
      2022-04-15
    • Related Report
      2021 Research-status Report
  • [Presentation] Characteristics of spatial distribution of rotors in non-paroxysm atrial fibrillation patients refractory to pulmonary vein isolation: ExTRa Mapping project.2022

    • Author(s)
      Okuyama Y, Ozawa T, Fujii Y, Kato K, Sugimoto Y, Nakagawa Y, Ashihara T.
    • Organizer
      第68回日本不整脈心電学会学術集会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Fetal and Infant Lethal Ventricular Arrhythmias Are Common in Cardiac Calmodulinopathy.2022

    • Author(s)
      Fukuyama M、Horie M, Kato K, Ozawa T, Fujii Y, Okuyama Y, Makiyama T, Ohno S, Nakagawa Y.
    • Organizer
      第68回日本不整脈心電学会学術集会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 頻脈性非発作性心房細動のためCRT-D適応外と思われたがアブレーションで今後の適応が見込まれた1例.2022

    • Author(s)
      山地亮輔, 芦原貴司, 小澤友哉, 奥山雄介, 藤居祐介, 加藤浩一, 杉本喜久, 中川義久.
    • Organizer
      第133回日本循環器学会近畿地方会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 早期診断を行なえたトランスサイレチン野生型心アミロイドーシス(ATTRwt)の1例.2022

    • Author(s)
      福村真優, 酒井 宏, 中川義久, 藤居祐介, 小澤友哉.
    • Organizer
      第133回日本循環器学会近畿地方会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Calmodulinopathy is a common cause of critical cardiac phenotypes in fetus and infancy2022

    • Author(s)
      M Fukuyama, M Horie, K Kato, T Ozawa, Y Fujii, Y Okuyama, T Makiyama, S Ohno, Y Nakagawa
    • Organizer
      European Society of Cardiology 2022
    • Related Report
      2022 Annual Research Report

URL: 

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

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi