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Molecular mechanisms of viral male-killing in a lepidopteran insect

Research Project

Project/Area Number 22K14903
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 39050:Insect science-related
Research InstitutionNational Agriculture and Food Research Organization

Principal Investigator

Nagamine Keisuke  国立研究開発法人農業・食品産業技術総合研究機構, 生物機能利用研究部門, 研究員 (20817548)

Project Period (FY) 2022-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2022: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywordsオス殺し / 昆虫 / 共生 / 微生物 / ウイルス / 性操作 / 生殖操作 / 性比異常 / 共生微生物 / Male killing / 昆虫ウイルス
Outline of Research at the Start

昆虫では,細胞内共生微生物の感染によって宿主のオスのみが死に至る“オス殺し”が多数報告されているが,そのほとんどは細菌によるものでウイルスによる例は非常に珍しく,ウイルス性オス殺しの分子機構はほとんど手つかずの状況である.
ハスモンヨトウから見つかったオス殺しウイルス(SlMKV)のゲノムには僅か7つの遺伝子がコードされている.本課題ではReMOT法と遺伝子組換え技術を用いて7つの遺伝子からオス殺し遺伝子を特定し,さらに,オス殺しの標的となる宿主の生命現象を次世代シーケンス解析や遺伝子組換え技術,培養細胞系を用いて特定する.これらの結果を総括し,ウイルスによるオス殺しの分子機構解明を目指す.

Outline of Final Research Achievements

In insects, symbiotic viruses have been reported to cause 'male-killing' by specifically killing the male host. Genome analysis of the male-killing virus (SlMKV) symbiotic with a spodopteran moth revealed that SlMKV has only seven genes. In this study, we attempted to identify the male-killing gene by functional analysis using recombinant silkworms and overy-translocating recombinant proteins. Nevertheless, despite these efforts, the male-killing gene could not be identified using either method. Future attempts to identify the male-killing gene will need to take into account the possibility of multiple genes functioning to cause male-killing and the possibility that viral RNA, rather than protein, causes male-killing.

Academic Significance and Societal Importance of the Research Achievements

昆虫では、様々な共生細菌が引き起こすオス殺しが報告されてきたが、近年になってウイルスによるオス殺しが立て続けに発見された。しかしながら、オス殺し遺伝子が特定されたウイルスはショウジョウバエに共生するDbMKPV1のみである。SlMKVはDbMKPV1のオス殺し遺伝子を持たないことから、独自のオス殺し遺伝子を獲得したと考えられる。ウイルスが持つ多様なオス殺しの分子機構を解明し、比較することが、オス殺しを獲得した進化的経緯や生態的な意義の解明につながると期待している。

Report

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

    (4 results)

All 2023 2022

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

  • [Journal Article] Male-killing virus in a noctuid moth Spodoptera litura2023

    • Author(s)
      Keisuke Nagamine, Yoshiaki Kanno, Ken Sahara, Toshiaki Fujimoto, Atsuo Yoshido, Yukio Ishikawa, Misato Terao, Daisuke Kageyama, and Yoshinori Shintani
    • Journal Title

      Proceedings of the National Academy of Sciences of the Unites States of America

      Volume: 120 (46) Issue: 46

    • DOI

      10.1073/pnas.2312124120

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] A male-killing gene encoded by a symbiotic virus of Drosophila2023

    • Author(s)
      Kageyama Daisuke、Harumoto Toshiyuki、Nagamine Keisuke、Fujiwara Akiko、Sugimoto Takafumi N.、Jouraku Akiya、Tamura Masaru、Katoh Takehiro K.、Watada Masayoshi
    • Journal Title

      Nature Communications

      Volume: 14 Issue: 1 Pages: 1357-1357

    • DOI

      10.1038/s41467-023-37145-0

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] A new antimicrobial peptide, Pentatomicin, from the stinkbug Plautia stali2022

    • Author(s)
      Nishide Yudai、Nagamine Keisuke、Kageyama Daisuke、Moriyama Minoru、Futahashi Ryo、Fukatsu Takema
    • Journal Title

      Scientific Reports

      Volume: 12 Issue: 1 Pages: 16503-16503

    • DOI

      10.1038/s41598-022-20427-w

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Male killing induced by maternally inherited viruses in arthropods2023

    • Author(s)
      Kageyama D, Harumoto T, FujiwaraA, Watada M, Nagamine K, Kanno Y, Shintani Y
    • Organizer
      The 11th Wolbachia conference
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research

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Published: 2022-04-19   Modified: 2025-01-30  

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