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Syndromic testing panel for central nervous system infections using the LAMP method

Research Project

Project/Area Number 19K07878
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 52010:General internal medicine-related
Research InstitutionFujita Health University

Principal Investigator

Ihira Masaru  藤田医科大学, 保健学研究科, 教授 (10290165)

Co-Investigator(Kenkyū-buntansha) 東本 祐紀  藤田医科大学, 医療科学部, 講師 (20569701)
吉川 哲史  藤田医科大学, 医学部, 教授 (80288472)
Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
KeywordsSyndromic test / LAMP / real time PCR / HSV-1 / HSV-2 / VZV / HHV-6 / multiplex LAMP / 中枢神経疾患 / ポリジメチルシロキサン / マイクロ流路チップ / Syndromatic LAMP / Point of Care testing / Syndromic testing panel
Outline of Research at the Start

LAMP法は、栄研化学が開発した迅速簡易な核酸等温増幅法である。臨床現場におけるPOCTとして非常に有用性が高い。我々の研究室ではLAMP法によるヘルペスウイルス感染症診断法開発に取り組み、9種類全てのヘルペスウイルスのLAMP法を開発した。本研究ではこれまでに当研究室が蓄積してきたLAMP法の研究成果を基盤とし、世界的な潮流となっているsyndromic testingにマッチした中枢神経感染症診断パネルシステム開発を目指しており、その独自性、有用性は極めて高い。

Outline of Final Research Achievements

The LAMP method consists of a simple instrument structure, and the combination of microfluidic chips, which enables system miniaturization and multiplexing of tests, is suitable for the Syndromic testing panel. Comparison of LAMP and real-time PCR assays of spinal fluid suspected of encephalitis/encephalopathy showed concordance for HHV-6 and VZV LAMPs but did not have enough sensitivity to detect HSV-2 and EBV DNA by LAMPs. After determining the lower detection limit of multiplex LAMP-based on a microfluidic chip, the clinical utility was comfited using 32 sab samples. If real-time PCR was used as a standard, sensitivity of HSV-1, HSV-2, and VZV LAMPs based on microfluidic chip were 90%, 100%, and 100%, and the specificity of three methods were 96%, 100% and 100%, respectively. Multiplex LAMP, based on a microfluidic chip that detects three alpha herpesviruses, may be useful in laboratory diagnosis of patients with vesicular skin lesions.

Academic Significance and Societal Importance of the Research Achievements

感染症領域では、症状に基づき複数病原を同時に検査するsyndromic testingが行われPCRを基礎としている。本邦で開発されたLAMP法は、迅速性・簡便性・コストのアドバンテージがあり、LAMP法を基礎とするsyndromic testing構築の意義は大きい。本研究は、脳炎・脳症を対象とした場合、一部が不完全でありさらに検討を必要とするが、皮膚ぬぐい液による水疱性疾患識別のためのMicro流体LAMPについてはreal-timePCRと比較しても十分な感度を確認した。

Report

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

    (4 results)

All 2021 2019

All Journal Article (3 results) (of which Peer Reviewed: 3 results) Presentation (1 results)

  • [Journal Article] Evaluation of varicella vaccine effectiveness during outbreaks in schools or nurseries by cross-sectional study2021

    • Author(s)
      Kawamura Y, Hattori F, Higashimoto Y, Kozawa K, Yoshikawa T.
    • Journal Title

      Vaccine

      Volume: 18:39(21) Issue: 21 Pages: 2901-3905

    • DOI

      10.1016/j.vaccine.2021.04.009

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Clinical Characteristics of Primary HHV-6B Infection in Children Visiting the Emergency Room2019

    • Author(s)
      Fumihiko Hattori , Yoshiki Kawamura , Kei Kozawa, Hiroki Miura, Misa Miyake, Akiko Yoshikawa, Masaru Ihira , Tetsushi Yoshikawa
    • Journal Title

      Pediatr Infect Dis J .

      Volume: 38(10) Issue: 10 Pages: e248-e253

    • DOI

      10.1097/inf.0000000000002379

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Reliability of Direct Varicella Zoster Virus Loop-Mediated Isothermal Amplification Method for Rapid Diagnosis of Breakthrough Varicella2019

    • Author(s)
      Higashimoto Y, Kawamura Y, Kuboshiki A, Hattori F, Miura H, Nishimura N, Ozaki T, Ihira M, Yoshikawa T; Nagoya VZV study group.
    • Journal Title

      J Clin Virol .

      Volume: 119 Pages: 53-58

    • DOI

      10.1016/j.jcv.2019.07.009

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] LAMP法とデルマクイックVZVによる水痘迅速診断法の有用性解析2021

    • Author(s)
      東本祐紀、服部文彦、河村芳樹、小澤慶、井平勝、諸岡正志、板倉尚子、田中宏、吉川哲史
    • Organizer
      第25回日本ワクチン学会
    • Related Report
      2021 Annual Research Report

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

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