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Analysis of molecular mechanism and universality of environmental sex determination

Research Project

Project/Area Number 16H04983
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Aquatic life science
Research InstitutionKumamoto University

Principal Investigator

KITANO TAKESHI  熊本大学, 大学院先端科学研究部(理), 准教授 (40336219)

Co-Investigator(Kenkyū-buntansha) 中村 將  一般財団法人沖縄美ら島財団(総合研究センター), 総合研究センター 動物研究室, 参与 (10101734)
井尻 成保  北海道大学, 水産科学研究院, 准教授 (90425421)
Research Collaborator Nozu Ryo  
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000)
Fiscal Year 2018: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2017: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2016: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000)
Keywordsコルチゾル / 環境依存的性決定 / メダカ / ミツボシキュウセン / ウナギ
Outline of Final Research Achievements

Medaka (Oryzias latipes) is a teleost fish with a XX/XY sex determination system. Previously, we reported that high temperature (HT) induced the masculinization of XX medaka by increasing the levels of cortisol, a major glucocorticoid produced by interrenal cells in teleosts. However, it remains unclear how HT induces cortisol levels and the hormone causes female-to-male sex reversal. Here, we first generated and analyzed corticotropin-releasing hormone knockout medaka, arginine vasotocin knockout fish and gonadal soma-derived growth factor knockout fish. Next, we performed next generation sequencing analysis using the larvae treated by HT or cortisol. As results, we identified 80 genes expression-induced by both HT and cortisol, and 41 genes expression-reduced by them. Moreover, we performed some treatment experiments using the protogynous wrasse (Halichoeres trimaculatus) and Japanese eel (Anguilla japonica).

Academic Significance and Societal Importance of the Research Achievements

ヒラメ等の養殖においては、雄よりも雌の方が成長が速い等の理由により、雌だけを作る性統御の技術開発が求められている。しかしながら、ヒラメの遺伝的雌は高温ストレス等により雄化するため、完全な性統御が行えないのが現状である。本研究では、温度依存的性決定にコルチゾルが関与することを初めて明らかにし、このホルモンの合成経路や雄化誘導経路について解析した。これらの研究成果は、安定した性統御が困難な環境依存的性決定を持つ魚種における画期的な性統御法となりうる。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Annual Research Report
  • 2016 Annual Research Report
  • Research Products

    (19 results)

All 2019 2018 2017 2016

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (14 results) (of which Int'l Joint Research: 4 results,  Invited: 3 results) Book (4 results)

  • [Journal Article] Expression patterns of sex differentiation-related genes during gonadal sex change in the protogynous wrasse, Halichoeres trimaculatus2018

    • Author(s)
      Horiguchi Ryo、Nozu Ryo、Hirai Toshiaki、Kobayashi Yasuhisa、Nakamura Masaru
    • Journal Title

      General and Comparative Endocrinology

      Volume: 257 Pages: 67-73

    • DOI

      10.1016/j.ygcen.2017.06.017

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] 魚類における環境依存的な性決定に関する研究2019

    • Author(s)
      北野健
    • Organizer
      平成31年度日本水産学会春季大会
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] メダカの雄化機構におけるコルチゾル下流因子の探索2019

    • Author(s)
      原誠二、白石絵吏、北野健
    • Organizer
      平成31年度日本水産学会春季大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 魚類の性分化におけるエストロゲンの役割2018

    • Author(s)
      北野健
    • Organizer
      平成30年度日本水産学会秋季大会シンポジウム
    • Related Report
      2018 Annual Research Report
  • [Presentation] 魚類の性転換現象から何を知ることができたか2018

    • Author(s)
      中村將
    • Organizer
      平成30年度日本水産学会秋季大会シンポジウム
    • Related Report
      2018 Annual Research Report
  • [Presentation] ティラピア、チョウザメ、ウナギの性分化2018

    • Author(s)
      井尻成保
    • Organizer
      平成30年度日本水産学会秋季大会シンポジウム
    • Related Report
      2018 Annual Research Report
  • [Presentation] メダカの雄化におけるGSDFの役割2018

    • Author(s)
      原誠二、澤村理英、白石絵吏、北野健
    • Organizer
      平成30年度日本水産学会春季大会
    • Related Report
      2017 Annual Research Report
  • [Presentation] ニシキゴイ卵巣形成過程に及ぼす高温ストレスの影響2018

    • Author(s)
      飯島啓、柴田安司、佐藤将、兵藤則行、中村將、平井俊朗
    • Organizer
      平成30年度日本水産学会春季大会
    • Related Report
      2017 Annual Research Report
  • [Presentation] アメマス遺伝的雌の生殖腺形成に対する雄化処理の影響2018

    • Author(s)
      小川智史・柴田安司・小林健一郎・兵藤則行・中村將・佐藤琢哉・平井俊朗
    • Organizer
      平成30年度日本水産学会春季大会
    • Related Report
      2017 Annual Research Report
  • [Presentation] コイ遺伝的雌生殖腺の性的可塑性に及ぼす体成長の影響2017

    • Author(s)
      小川智史、飯島啓、兵藤則行、佐藤将、柴田安司、中村將、平井俊朗
    • Organizer
      第42回日本比較内分泌学会
    • Related Report
      2017 Annual Research Report
  • [Presentation] ニホンウナギの生殖腺性分化に及ぼす低密度および単独飼育の影響2017

    • Author(s)
      稲葉駿、松谷紀明、井尻成保、足立伸次
    • Organizer
      平成29年度日本水産学会春季大会
    • Related Report
      2016 Annual Research Report
  • [Presentation] Gonadotropins and their roles on sexual development in medaka.2016

    • Author(s)
      Kitano T, Takenaka T, Murozumi N, Hara S.
    • Organizer
      8th Congress of the Asia and Oceania Society for comparative Endocrinology
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Role of estrogens on gonadal sex differentiation in medaka.2016

    • Author(s)
      Hara S, Murakami T, Osafune N, Kitano T.
    • Organizer
      8th Congress of the Asia and Oceania Society for comparative Endocrinology
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] What we know from sex changes in fish?2016

    • Author(s)
      Masaru Nakamura
    • Organizer
      22nd International Congress of Zoology
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Changes in expression of sex differentiation-related genes during sex change in the protogynous wrasse, Halichoeres trimaculatus.2016

    • Author(s)
      Ryo Horiguchi, Ryo Nozu and Masaru Nakamura
    • Organizer
      8th International Symposium on Fish Endocrinology
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Book] Endocrine and environmental control of sex differentiation in gonochoristic fish. In: Diversity in Sex Differentiation, Reproductive & Developmental Strategies.2018

    • Author(s)
      Takeshi Kitano
    • Publisher
      Springer
    • Related Report
      2018 Annual Research Report
  • [Book] Variety of sex change in Tropical Fish. In: Diversity in Sex Differentiation, Reproductive & Developmental Strategies.2018

    • Author(s)
      Yasuhisa Kobayashi, Ryo Nozu, Ryo Horiguchi, Masaru Nakamura
    • Publisher
      Springer
    • Related Report
      2018 Annual Research Report
  • [Book] Sex determination and control in groupers. In: SEX CONTROL IN AQUACULTUFRE.2018

    • Author(s)
      Masaru Nakamura and Yasuhisa Kobayashi
    • Publisher
      WILEY Blackwell
    • Related Report
      2018 Annual Research Report
  • [Book] 魚類学 第14章 生殖2017

    • Author(s)
      井尻成保(矢部衞、桑村哲生、都木靖彰 編)
    • Total Pages
      388
    • Publisher
      恒星社厚生閣
    • ISBN
      9784769916109
    • Related Report
      2017 Annual Research Report

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Published: 2016-04-21   Modified: 2020-03-30  

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