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Characterization of a male-killing virus and its mode of action in Homona magnanima

Research Project

Project/Area Number 17208006
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Applied entomology
Research InstitutionTokyo University of Agriculture and Technology

Principal Investigator

KUNIMI Yasuhisa  Tokyo University of Agriculture and Technology, Graduate School, Institute of Symbiotic Science and Technology, Professor (50195476)

Co-Investigator(Kenkyū-buntansha) NAKAI Madoka  Tokyo University of Agriculture and Technology, Graduate School, Institute of Symbiotic Science and Technology, Associate Professor (60302907)
Project Period (FY) 2005 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥47,190,000 (Direct Cost: ¥36,300,000、Indirect Cost: ¥10,890,000)
Fiscal Year 2007: ¥10,400,000 (Direct Cost: ¥8,000,000、Indirect Cost: ¥2,400,000)
Fiscal Year 2006: ¥10,270,000 (Direct Cost: ¥7,900,000、Indirect Cost: ¥2,370,000)
Fiscal Year 2005: ¥26,520,000 (Direct Cost: ¥20,400,000、Indirect Cost: ¥6,120,000)
KeywordsHomona magnanima / late male-killing / sex-ratio distorters / RNA virus / prevalence / RT-PCR / late male-killing / 雄殺し / cDNA / SMART / RAPD / RACE法 / コッホの3原則
Research Abstract

Maternally inherited female-biased sex ratios have been documented in many invertebrate species. One cause of such biased sex ratios is male-killing ; that is, only males die. In most species, male-killing occurs during embryonic stages (early male-killing) and is associated with cytoplasmic bacteria. However, the oriental tea tortrix, Homona magnanima, is one of the few species in which male death occurs in the larval or pupal stage, and is thus an example of late male-killing. In this study, we examined the gross morphology and histopathology of a late male-killing strain (LMK) of H. magnanima larvae, and spatial and temporal dynamics of the agent in natural populations of H. magnanima, and partially purified the agent causing late male-killing in H. magnanima.
Most male LMK larvae died during the last instar or pupal stage, and dead male larvae showed characteristic signs and symptoms of male-killing. The body color of male LMK larvae started to change 4 days after molting into the f … More ifth instar and became increasingly opaque white. Male LMK larvae weighed significantly less than normal strain (NSR) males. Midgut cells of male LMK larvae were discharged into the lumen as granules at 7 days after the final molt, and dropped into the lumen just before death. The fat body of male LMK larvae contained large fat granules in the cytoplasm but became a tumorlike cell mass that finally fused with the epidermal cells.
To identify the late male-killing agent, we purified a causal agent from male LMK larvae by sucrose gradient ultracentrifugation. Injection experiment revealed that the purified fraction contained the late male-killing agent, and electron microscopy showed that the purified fraction has isometric particles of 10-15 nm in diameter. Nucleic acids in the purified fraction were degraded by RNase A but not by DNase I, which suggests that nucleic acids in the purified fraction were RNAs but not DNAs. LMK specific two RNA sequences, MK1068 and MK1241, were identified from the purified fraction. A BLAST research revealed that their nucleotide and deduced amino acid sequences did not match any other known sequences. These results suggested that male-killing in H. magnanima may be caused by a new RNA virus. This RNA virus was detected from H. magnanima larvae collected in Miyazaki, Gifu, Shizuoka, Saitama and Ibaragi Prefectures. Less

Report

(4 results)
  • 2007 Annual Research Report   Final Research Report Summary
  • 2006 Annual Research Report
  • 2005 Annual Research Report
  • Research Products

    (24 results)

All 2008 2007 2006 2005

All Journal Article (8 results) (of which Peer Reviewed: 2 results) Presentation (15 results) Book (1 results)

  • [Journal Article] Novel RNA sequences associated with late male-killing in Homona magnanima2008

    • Author(s)
      Nakanishi, K., ら
    • Journal Title

      Proceedings of the Royal Society B 275

      Pages: 1249-1254

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Gross morphology and histopathology of male-killing strain larvae in the oriental tea tortrix, Homona magnanima(Lepidoptera: Tortricidae).2008

    • Author(s)
      Hoshino, M., ら
    • Journal Title

      Applied Entomology and Zoology 43

      Pages: 119-125

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Novel RNA sequences associated with late male-killing in Homona magnanima2008

    • Author(s)
      K., Nakanishi, M., Hoshino, M., Nakai, Y., Kunimi
    • Journal Title

      Proceedings of the Royal Society B 275

      Pages: 1249-1254

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Gross morphology and histopathology of male-killing strain larvae in the oriental tea tortrix, Homona magnanima (Lepidoptera : Tortricidae).2008

    • Author(s)
      M., Hoshino, K., Nakanishi, M., Nakai, Y., Kunimi
    • Journal Title

      Applied Entomology and Zoology 43

      Pages: 119-125

    • NAID

      110006622913

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Novel RNA sequences associated with late male-killing in Homonc magnantma2008

    • Author(s)
      Nakanishi, K., M. Hoshino, M. Nakai, Y. Kunimi
    • Journal Title

      Proceedings of the Royal Society B 2008(In press)

    • Related Report
      2007 Annual Research Report
  • [Journal Article] Gross morphology and histopathology of male-killing strain larvae in the oriental tea tortrix, Homona magnanima (Lepidoptera:Tortricidae).2008

    • Author(s)
      Hoshino, M., K. Nakanishi, M. Nakai, Y. Kunimi
    • Journal Title

      Applied Entomology and Zoology 43

      Pages: 119-125

    • Related Report
      2007 Annual Research Report
  • [Journal Article] Microorganisms associated with soil arthropods. In : Manual of Environmental Microbiology 3rd edition2007

    • Author(s)
      A.E., Hajek, Fuxa, J., Y., Kunimi
    • Journal Title

      ASM Press

      Pages: 769-780

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Current status and prospects on microbial control n Japan2007

    • Author(s)
      Yasuhisa Kunimi
    • Journal Title

      Journal of Invertebrate Pathology 95(In press)

    • Related Report
      2006 Annual Research Report
  • [Presentation] Changes in the prevalence of the male-killing virus in natural populations of the oriental tea tortrix, Homona mnanima (Lepidoptera : Tortricidae)2008

    • Author(s)
      H., Koyama, K., Nakanishi, M., Nakai, Y., Kunimi
    • Organizer
      68th Annual Meeting of Japanese Society of Insect Pathology
    • Place of Presentation
      The Tsukuba Center for Institutes
    • Year and Date
      2008-12-07
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] チャハマキMale-killing系統の組織学的変性と因子の増殖との関係2008

    • Author(s)
      星野真酉, ら
    • Organizer
      第52回日本応用動物昆虫学会大会
    • Place of Presentation
      宇都宮大学
    • Year and Date
      2008-03-27
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] チャハマキ野外個体群におけるオス殺しウイルスの有病率の時空間的変動2008

    • Author(s)
      小山裕徳, ら
    • Organizer
      第52回日本応用動物昆虫学会大会
    • Place of Presentation
      宇都宮大学
    • Year and Date
      2008-03-27
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Relationships between degradation of midgut tissue and replication of male-killing virus in larvae of the oriental tea tortrix, Homona mnanima (Lepidoptera : Tortricidae).2008

    • Author(s)
      M., Hoshino, K., Nakanishi, M., Nakai, Y., Kunimi
    • Organizer
      52th Annual Meeting of Japanese Society of Applied Entomology and Zoology
    • Place of Presentation
      Utsunomiya University
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Spatial and temporal Dynamics of prevalence of the male-killing virus in natural populations Of the oriental tea tortrix, Homona mnanima (Lepidoptera : Tortricidae).2008

    • Author(s)
      H., Koyama, K., Nakanishi, M., Nakai, Y., Kunimi
    • Organizer
      52th Annual Meeting of Japanese Society of Applied Entomology and Zoology
    • Place of Presentation
      Utsunomiya University
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] チャハマキ野外個体群におけるオス殺しウイルスの有病率の変動2007

    • Author(s)
      小山裕徳, ら
    • Organizer
      第68回昆虫病理研究会
    • Place of Presentation
      文部科学省研究交流センター
    • Year and Date
      2007-12-07
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Identification and characterization of novel RNA sequences associated with late male-killing in the oriental tea tortrix, Homona magnanima2007

    • Author(s)
      Nakanishi, K., M. Hoshino, H. Koyama, M. Nakai and Y Kunimi
    • Organizer
      40th Annual Meeting of the Society for Invertebrate Pathology
    • Place of Presentation
      ケベック大学(カナダ)
    • Year and Date
      2007-08-14
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] チャハマキmale-killing系統におけるオス幼虫の病理組織学的観察2007

    • Author(s)
      星野真酉, ら
    • Organizer
      第51回日本応用動物昆虫学会大会
    • Place of Presentation
      広島大学
    • Year and Date
      2007-03-28
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] 特異的RNAを用いたチャハマキのlate male-killing因子の解析2007

    • Author(s)
      中西和子, ら
    • Organizer
      第51回日本応用動物昆虫学会大会
    • Place of Presentation
      広島大学
    • Year and Date
      2007-03-28
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Identification and characterization of novel RNA sequences associated with late male-killing in the oriental tea tortrix, Homona magnanima (Lepidoptera : Tortricidae)2007

    • Author(s)
      K., Nakanishi, M., Hoshino, M., Nakai, Y., Kunimi
    • Organizer
      40th Annual Meeting of the Society for Invertebrate Pathology
    • Place of Presentation
      Quebec University, Canada
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Gross pathology and and histopathology of male-killing strain larvae in the oriental tea tortrix, of the oriental tea tortrix, Homona mnanima (Lepidoptera : Tortricidae)2007

    • Author(s)
      M., Hoshino, K., Nakanishi, M., Nakai, Y., Kunimi
    • Organizer
      51th Annual Meeting of Japanese Society of Applied Entomology and Zoology
    • Place of Presentation
      Hiroshima University
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Identification of the agent causing late male-killing in the oriental tea tortrix, Homona mnanima using specific RNA sequences2007

    • Author(s)
      K., Nakanishi, M., Hoshino, H., Koyama, M., Nakai, Y., Kunimi
    • Organizer
      51th Annual Meeting of Japanese Society of Applied Entomology and Zoology
    • Place of Presentation
      Hiroshima University
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Iチャハマキから単離されたRNA断片はlate male-killingの原因因子か?2006

    • Author(s)
      中西和子, ら
    • Organizer
      第7回昆虫病理研究会シンポジウム
    • Place of Presentation
      人材開発センター(山梨県)
    • Year and Date
      2006-09-29
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] チャハマキのlate male-killingに関与するcDNAの同定.2006

    • Author(s)
      中西和子, ら
    • Organizer
      第50回日本応用動物昆虫学会大会
    • Place of Presentation
      筑波大学
    • Year and Date
      2006-03-28
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] RAPDを用いたチャハマキのmale-killing因子の探索2005

    • Author(s)
      中西和子, ら
    • Organizer
      第67回昆虫病理研究会
    • Place of Presentation
      (独)森林総合研究所
    • Year and Date
      2005-12-08
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Book] Microorganisms associated with soil arthropods. In: Manual of Environmental Microbiology 3rd edition2007

    • Author(s)
      Hajek, A. E., Fuxa, J. and Y. Kunimi
    • Total Pages
      1293
    • Publisher
      ASM Press
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary

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Published: 2005-04-01   Modified: 2016-04-21  

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