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2016 Fiscal Year Annual Research Report

Epidemiological risk prediction and validation of fungal resistance mechanism of threatened amphibian species based on immunity related genes

Research Project

Project/Area Number 26830144
Research InstitutionHiroshima University

Principal Investigator

井川 武  広島大学, 国際協力研究科, 助教 (00507197)

Project Period (FY) 2014-04-01 – 2017-03-31
Keywords両生類 / 絶滅危惧種 / 西南諸島 / 主要組織適合遺伝子複合体 / MHC / トランスクリプトーム / 発現解析 / 分子進化
Outline of Annual Research Achievements

近年、生息域の破壊や地球温暖化、ツボカビ感染などにより、両生類が減少している。日本産両生類についても半数以上が絶滅危惧種に該当し、多くが西南諸島固有種に集中している。そこで、本研究では抗原を認識し免疫応答を開始させる重要な分子である主要組織適合遺伝子複合体(MHC)を単離し、抗原認識部位の多様性を調査することで、疫学的リスクを予測し、対象種の保全に役立てることを目的に研究を行った。
最終年度については、MHCを含む獲得免疫及び、自然免疫のレパートリーと種間及び島間での遺伝子発現の違いを検証するために、これまでにそれぞれの種の皮膚及び、脾臓から得たmRNAを次世代シークエンサーにより解析した大規模データに基づいて、比較トランスクリプトームを行った。その結果、奄美大島及び沖縄島に生息する姉妹種の間での発現遺伝子の類似性と、それぞれの島の中での他種との違いが明らかとなった。また、すべての種において発現していた遺伝子のセットを網羅的な相同性比較により構築し、配列比較によってそれぞれの遺伝子の進化速度の比較を行った。その結果、血球関連遺伝子などにおいて進化速度が速くなっていることが推測された。さらに、MHC遺伝子についてはすべての種において相同な遺伝子配列を決定することに成功し、詳細な系統解析を行った。その結果、いくつかの姉妹種において種をまたいで良く似た遺伝子配列を有していることが明らかとなった。また、比較対象として本州産のアカガエル類についてもMHC遺伝子を決定し、その多様性を検証した。

  • Research Products

    (13 results)

All 2017 2016

All Journal Article (8 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 8 results,  Open Access: 5 results,  Acknowledgement Compliant: 3 results) Presentation (5 results) (of which Int'l Joint Research: 5 results)

  • [Journal Article] Fine-scale demographic processes resulting from multiple overseas colonization events of the Japanese stream tree frog, Buergeria japonica2017

    • Author(s)
      Shohei Komaki, Si-Min Lin, Masafumi Nozawa, Shohei Oumi, Masayuki Sumida, Takeshi Igawa
    • Journal Title

      Journal of Biogeography

      Volume: 印刷中 Pages: 印刷中

    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Development and Characterization of 23 Microsatellite Markers for the Montane Brown Frog (Rana ornativentris)2017

    • Author(s)
      Hisanori Okamiya, Takeshi Igawa, Masafumi Nozawa, Masayuki Sumida, and Tamotsu Kusano
    • Journal Title

      Current Herpetology

      Volume: 36 Pages: 63-68

    • DOI

      10.5358/hsj.36.63

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Salinity and thermal tolerance of Japanese stream tree frog (Buergeria japonica) tadpoles from island populations2016

    • Author(s)
      Shohei Komaki, Takeshi Igawa, Si-Min Lin, Masayuki Sumida
    • Journal Title

      Herpetological Journal

      Volume: 26 Pages: 207-211

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Inter- and intra-specific genetic divergence of Asian tiger frogs (genus Hoplobatrachus), with special reference to the population structure of H. tigerinus in Bangladesh2016

    • Author(s)
      Sultana Nasrin, Takeshi Igawa, Mohammed Mafizul Islam, Mahmudul Hasan, Mohammad Shafiqul Alam, Shohei Komaki, Kensuke Kawamura, Md. Mukhlesur Rahman Khan, Masayuki Sumida
    • Journal Title

      Genes & Genetic Systems

      Volume: 91 Pages: 217-228

    • DOI

      10.1266/ggs.16-00006

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] The first see-through frog created by breeding: description, inheritance patterns, and dermal chromatophore structure2016

    • Author(s)
      Masayuki Sumida, Mohammed Islam, Takeshi Igawa, Atsushi Kurabayashi, Yukari Furukawa, Naomi Sano, Tamotsu Fujii, Norio Yoshizaki
    • Journal Title

      Scientific Reports

      Volume: 6 Pages: 24431

    • DOI

      10.1038/srep24431

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Population structure and evolution after speciation of the Hokkaido salamander (Hynobius retardatus)2016

    • Author(s)
      Masatoshi Matsunami, Takeshi Igawa, Hirofumi Michimae, Toru Miura, Kinya Nishimura
    • Journal Title

      PLoS One

      Volume: 11 Pages: e0156815

    • DOI

      10.1371/journal.pone.0156815

    • Peer Reviewed / Open Access
  • [Journal Article] Living in a Japanese onsen: field observations and physiological measurements of hot spring amphibian tadpoles, Buergeria japonica2016

    • Author(s)
      Shohei Komaki, Lau Quintin, Takeshi Igawa
    • Journal Title

      Amphibia-Reptilia

      Volume: 37 Pages: 311-314

    • DOI

      10.1163/15685381-00003052

    • Peer Reviewed / Open Access
  • [Journal Article] Characterization of major histocompatibility complex class I genes in Japanese Ranidae frogs2016

    • Author(s)
      Quintin Lau, Takeshi Igawa, Shohei Komaki, Yoko Satta
    • Journal Title

      Immunogenetics

      Volume: 68 Pages: 797-806

    • DOI

      10.1007/s00251-016-0934-x

    • Peer Reviewed / Open Access
  • [Presentation] Identifying immune genes from Japanese frogs (Genus Rana)2016

    • Author(s)
      Quintin Lau, Takeshi Igawa, Yoko Satta
    • Organizer
      Joint meeting of the 22nd International Congress of Zoology (ICZ) & the 87th meeting of the ZSJ
    • Place of Presentation
      恩納村 沖縄県
    • Year and Date
      2016-11-14 – 2016-11-19
    • Int'l Joint Research
  • [Presentation] Genetic relationships and inbreeding ratio among strains of the western clawed frog, Xenopus tropicalis2016

    • Author(s)
      Takeshi Igawa, Ai Watanabe, Atsushi Suzuki, Akihiko Kashiwagi, Keiko Kashiwagi, Anna Noble, Matt Guille, David E. Simpson, Marko E. Horb, Tamotsu Fujii
    • Organizer
      Joint meeting of the 22nd International Congress of Zoology (ICZ) & the 87th meeting of the ZSJ
    • Place of Presentation
      恩納村 沖縄県
    • Year and Date
      2016-11-14 – 2016-11-19
    • Int'l Joint Research
  • [Presentation] Comparative transcriptome analyses of eight endangered amphibians in Ryukyu Archipelago2016

    • Author(s)
      Takeshi Igawa, Masatoshi Matsunami, Quintin Lau, Masayuki Sumida
    • Organizer
      The 8th World Congress of Herpetology
    • Place of Presentation
      Tonglu, China
    • Year and Date
      2016-08-15 – 2016-08-21
    • Int'l Joint Research
  • [Presentation] Comparative transcriptome analyses of eight endangered amphibians in Ryukyu Archipelago2016

    • Author(s)
      Takeshi Igawa, Masatoshi Matsunami, Quintin Lau, Masayuki Sumida
    • Organizer
      Society for Molecular Biology and Evolution (SMBE)
    • Place of Presentation
      Gold Coast, Australia
    • Year and Date
      2016-07-03 – 2016-07-07
    • Int'l Joint Research
  • [Presentation] Selection acting on MHC class I genes in Japanese Ranidae frogs2016

    • Author(s)
      Quintin Lau, Takeshi Igawa, Shohei Komaki, Yoko Satta
    • Organizer
      Society for Molecular Biology and Evolution (SMBE)
    • Place of Presentation
      Gold Coast, Australia
    • Year and Date
      2016-07-03 – 2016-07-07
    • Int'l Joint Research

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Published: 2018-01-16  

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