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Research for forensic entomological indicators that contribute to improving the accuracy of estimating postmortem intervals during warm-cold boundary periods and cold seasons

Research Project

Project/Area Number 21K10529
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 58040:Forensics medicine-related
Research InstitutionIwate Medical University

Principal Investigator

SAIGUSA Kiyoshi  岩手医科大学, 教養教育センター, 准教授 (30398490)

Co-Investigator(Kenkyū-buntansha) 高宮 正隆  岩手医科大学, 医学部, 教授 (30364334)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2022: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2021: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords法昆虫学 / 死後経過時間推定 / 寒暖境界期 / 寒冷期 / クロバエ科 / 低温耐性 / 休眠 / 越冬 / 遺伝子発現 / 早期入植双翅目
Outline of Research at the Start

現在,寒暖境界期および寒冷期における法昆虫学的死後経過時間推定は温暖期に比し精度が劣る。原因として温暖期昆虫の休眠/覚醒,寒冷期昆虫の緩徐な成長と基礎的知見が乏しいことが挙げられる。そこで,温暖期の双翅目についての休眠/覚醒条件の把握と,寒冷期のクロバエ科4種の幼若期体長の経時的変化および生活環に要する積算時度(ADH)などの基礎的知見を得る。併せて,昆虫の成長および低温耐性に関わる遺伝子の発現量を定量的PCRにて経時的に測定し,日齢あるいは季節鑑別の指標として,死後経過時間推定精度の向上に資する遺伝子の探索を行う。また,事例適用を通じて.遺伝子発現解析の指標としての有用性を検証する。

Outline of Final Research Achievements

The temporal changes in gene expression related to cold tolerance and diapause in 4 species of Calliphoridae that are dominant during the cold seasons and investigated the utility as an indicator of the elapsed time. For genetic analysis, 4 blowfly species were reared in a controlled environment (photoperiod 12 hours, L/D: 20℃/10℃, 70% RH) from eggs to adult flies emergence observed them over time, and collected samples for gene expression analysis. However, insufficient samples were able to obtain. The cause for the difficulty in collecting matured females was thought to be insufficient information on their ecology, as well as environmental factors such as temperature differences between day and night and weather changes. To obtain the necessary number of samples for analysis, it is continuing our efforts to understand the activity (oviposition) conditions of the 4 blowfly species by placing pieces of sliced pork outdoors and recording them with a fixed-point device.

Academic Significance and Societal Importance of the Research Achievements

寒暖境界期および寒冷期にも死体が昆虫の蚕食を受けている例は散見されるが、法昆虫学的死後経過時間推定は温暖期に比し推定精度が低下する。その理由として、温暖期に優勢な昆虫は越冬のために休眠すること、寒冷期に優勢な昆虫は成長が緩徐で双翅目幼虫の体長のような形態学的変化を時間経過の指標として推定に利用することが難しいことなどが挙げられる。また、寒冷期の昆虫の活動(産卵)条件など生態学的知見が乏しいことに加え昼夜の気温差など環境要因も考慮しなければならない。遺伝子発現量を時間経過の指標として利用可能になれば、寒暖境界期・寒冷期の死後経過時間推定精度の向上が期待でき法昆虫学的解析の需要に応えるものである。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (5 results)

All 2023 2022 2021

All Journal Article (2 results) (of which Peer Reviewed: 1 results) Presentation (3 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] 法昆虫学的解析における死体発見現場にて撮影された画像情報の有用性2023

    • Author(s)
      三枝 聖,藤田さちこ,髙宮正隆,青木康博
    • Journal Title

      法医学の実際と研究

      Volume: 66 Pages: 153-156

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 法昆虫学者という職業2022

    • Author(s)
      三枝 聖
    • Journal Title

      昆虫と自然

      Volume: 57 Pages: 31-33

    • Related Report
      2022 Research-status Report
  • [Presentation] 法昆虫学的解析における画像情報の有用性2023

    • Author(s)
      三枝 聖,藤田さちこ,髙宮正隆
    • Organizer
      第107次日本法医学会学術全国集会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 法昆虫学的解析における現場写真の有用性2022

    • Author(s)
      三枝 聖・藤田さちこ・高宮正隆・青木康博
    • Organizer
      第106次日本法医学会学術全国集会
    • Related Report
      2022 Research-status Report
  • [Presentation] A case in which postmortem interval was estimated by diapause of the warm-season flies2021

    • Author(s)
      Kiyoshi Saigusa, Masataka Takamiya, Sachiko Fujita and Yasuhiro Aoki
    • Organizer
      100. Jahrestagung der Deutschen Gesellschaft fur Rechtsmedizin (DGRM).
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research

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Published: 2021-04-28   Modified: 2025-01-30  

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