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2008 Fiscal Year Annual Research Report

魚類の性決定機構の分子解明

Research Project

Project/Area Number 17208019
Research InstitutionUniversity of the Ryukyus

Principal Investigator

中村 將  University of the Ryukyus, 熱帯生物圏研究センター, 教授 (10101734)

Co-Investigator(Kenkyū-buntansha) 小林 亨  愛媛大学, 南予水産研究センター, 准教授 (30221972)
平井 俊朗  帝京科学大学, 理工学部, 講師 (30238331)
Keywords性分化 / 性決定 / 性転換 / 雌性ホルモン / 雄性ホルモン / アロマターゼ / ステロイド代謝酵素 / 生殖細胞
Research Abstract

コイ(Cyprinus carpio)遺伝的雌生殖腺における性的可塑性についてさらに研究を行った。孵化後1年の未成熟魚による先の報告を受けて、孵化後2年の卵黄形成初期から中期にある個体に対するアロマターゼ合成阻害剤の投与実験を行い、卵巣縁辺部に部分的な精巣組織の誘導を確認した。さらにこれらの部分的精巣化は卵巣縁辺部に散在する未分化な生殖細胞を含む組織に由来し、この領域に存在する体細胞が性的可塑性を保持していることが「性分化後性転換」の主因であると推察しうる結果を得た。先の未成熟魚による実験ではこのような性的可塑性を保持した組織が生殖腺内に広く分布しており、このことが生殖腺全体の精巣化誘導に結びついたものと考えられる。コイでは孵化後の飼育条件によって個体の成長に著しい差が生じ、それは精巣形成にも大きな影響を及ぼすことが判明した。また、精巣特有の小葉構造の出現とともに潜在的卵巣化能(性的可塑性)が失われることがわかった。
これまでに、芳香化酵素阻害剤によるティラピア成熟雌の卵巣から精巣への性転換過程を調べた結果、部位特異的に開始することが明らかとなった。卵巣構成細胞がどのように精巣構成細胞ヘリクルートされるのかについて、各生殖腺構成細胞に特異的に発現する遺伝子(DMRT1,Foxl2等)を指標として解析した。この性転換課程では、まず、Foxl2の発現低下とともに卵黄蓄積前の卵母細胞の退化が起こる。その後、卵巣薄板の体細胞、ろ胞のtheca細胞および、卵原細胞を取り囲む体細胞でDMRT1の発現誘導が起こった。精巣への分化転換過程を時系列で解析した結果、これらのDMRT1陽性細胞が精巣実質部の構築に参加するが、退化ろ胞の顆粒膜細胞はFoxl2、DMRT1陰性であり、かつ精巣実質部への構築には参加しないことが明らかとなった。

  • Research Products

    (46 results)

All 2009 2008

All Journal Article (17 results) (of which Peer Reviewed: 17 results) Presentation (29 results)

  • [Journal Article] Molecular characterization and quantification of the gonadotropin receptors FSH-R and LH-R from Atlantic cod(Gadus morhua).2009

    • Author(s)
      Mittelholzer, C
    • Journal Title

      Gen. Comp. Endocrinol. 106

      Pages: 47-58

    • Peer Reviewed
  • [Journal Article] . Immunohistochemical evidence for 11β-hydroxylase(P45011β)and androgen production in the gonad during sex defferentiation and in adults in the protandrous anemonefish Amphiprion clarkii.2008

    • Author(s)
      S. Miura
    • Journal Title

      Zool Sci 25

      Pages: 212-219

    • Peer Reviewed
  • [Journal Article] Sexual dimorphic expression of genes in gonads during early differentiation of a Teleostfish, the nile tilapia Oreochromis niloticus.2008

    • Author(s)
      S. Ijiri
    • Journal Title

      Biology of reproduction 78

      Pages: 333-341

    • Peer Reviewed
  • [Journal Article] Sex change of adult initial-phase male wrasse, Halichoeres trimaculatus by estradiol-17 β treatment.2008

    • Author(s)
      Y. Kojima
    • Journal Title

      Gen Comp Endocrinol 156

      Pages: 628-632

    • Peer Reviewed
  • [Journal Article] Appearances and chronological changes of mummichog Fundulus heteroclitus FSH cells and LH cells curing ontogeny, sexual differentiation, and gonadal development.2008

    • Author(s)
      A. Shimizu
    • Journal Title

      Gen Comp Endocrinol 156

      Pages: 312-322

    • Peer Reviewed
  • [Journal Article] Differentiation of ambisexual gonads and immunohistochemical localization of P450 cholesterol side-chain cleavage enzyme during gonadal sex differentiation in theprotandrous anemonefish, Amphiprion clarkii2008

    • Author(s)
      S. Miura
    • Journal Title

      Comp. biochem. physiol B149

      Pages: 29-37

    • Peer Reviewed
  • [Journal Article] Molecular cloning and expression of three estrogen receptors in the protogynous wrasse, Halichoeres trimaculatus.2008

    • Author(s)
      R. Horiguchi
    • Journal Title

      Cybium 32(2)

      Pages: 88-89

    • Peer Reviewed
  • [Journal Article] In vitro induction of gonadal sex change in a protogynous fish, three-spotted wrasse(Halichoeres trimaculatus).2008

    • Author(s)
      T. Todo
    • Journal Title

      Cybium 32(2)

      Pages: 106

    • Peer Reviewed
  • [Journal Article] ‘Post-sex differentiational'sex reversal in the female common carp(Cyprinus carpio).2008

    • Author(s)
      S. Ogawa
    • Journal Title

      Cybium 32(2)

      Pages: 102-103

    • Peer Reviewed
  • [Journal Article] The role of estrogen in gonadal sex differentiation in protandrous anemonefish Amphiprion clarkii. Immunohistochemical localization of P450scc in gonads of male and female phases.2008

    • Author(s)
      S. Miura
    • Journal Title

      Cybium 32(2)

      Pages: 87

    • Peer Reviewed
  • [Journal Article] Stability in Aromatase Immunoreactivity of Steroid-Producing Cells during Early Development of XX Gonads of the Nile tilapia, Oreochromis niloticus : An Organ Culture Study・2008

    • Author(s)
      F. Sakai
    • Journal Title

      Zool. Sci 25(3)

      Pages: 344-348

    • Peer Reviewed
  • [Journal Article] Sexual dimorphic expression of DMRT1 and Sox9 during gonadal differentiation and hormone-induced sex reversal in the teleost fish Nile tilapia(Oreochromis niloticus).2008

    • Author(s)
      T. Kobayashi
    • Journal Title

      Dev. Dyn 237(1)2

      Pages: 297-306

    • Peer Reviewed
  • [Journal Article] Molecular Cloning of Plkl and Nek2 and their Expression in Mature Gonads of the Teleost Fish Nile Tilapia (Oreochromis Niloticus).2008

    • Author(s)
      Y. Matsuoka
    • Journal Title

      Mol. Reprod. Develop 75 (6)

      Pages: 989-1001

    • Peer Reviewed
  • [Journal Article] Seabream GnRH immunoreactivity in brain and pituitary of XX and XY Nile tilapia, Oreochroomis niloticus during early development.2008

    • Author(s)
      Swapna, I
    • Journal Title

      J. Exp. Zool. Part A 309 (7)

      Pages: 419-426

    • Peer Reviewed
  • [Journal Article] Molecular cloning and gene expression of Foxl2 in the frog Rana rugosa.2008

    • Author(s)
      Oshima, Y
    • Journal Title

      Gen. Comp. Endocrinol 159 (2-3)

      Pages: 170-177

    • Peer Reviewed
  • [Journal Article] Transgenic medaka enables easy detection of oocytes in live fish.2008

    • Author(s)
      Kinoshita, M
    • Journal Title

      Mol. Reprod. Develop 76 (2)

      Pages: 202-207

    • Peer Reviewed
  • [Journal Article] The mechanisms of gonadal sex determination and differentiation in fish2008

    • Author(s)
      Kobayashi, T
    • Journal Title

      Bull. Fish. Res Agen No. 26

      Pages: 107-114

    • Peer Reviewed
  • [Presentation] ヤイトハタEpinephelus malabaricusの性分化と雄生ホルモン処理による早期性転換誘導の試み2009

    • Author(s)
      村田良介
    • Organizer
      平成21年度日本水産学会春季大会
    • Place of Presentation
      東京都品川
    • Year and Date
      20090327-20090331
  • [Presentation] 魚類の生殖機構-基礎と応用-性転換魚類2009

    • Author(s)
      小林靖尚
    • Organizer
      平成21年度日本水産学会春季大会
    • Place of Presentation
      東京都品川
    • Year and Date
      20090327-20090331
  • [Presentation] 雌性先熟魚ミツボシキュウセンにおける性転換過程の生殖腺と体細胞の増殖2009

    • Author(s)
      野津了
    • Organizer
      平成21年度日本水産学会春季大会
    • Place of Presentation
      東京都品川
    • Year and Date
      20090327-20090331
  • [Presentation] コイ雄生殖腺の性的可塑性についての研究 成長と性分化の関連性2009

    • Author(s)
      小川智史
    • Organizer
      平成21年度日本水産学会春季大会
    • Place of Presentation
      東京都品川
    • Year and Date
      20090327-20090331
  • [Presentation] ヤイトハタEpinephelus malabaricusの性分化と雄性ホルモン処理による早期性転換誘導の試み2009

    • Author(s)
      村田良介
    • Organizer
      海産無脊椎動物研究会
    • Place of Presentation
      愛媛
    • Year and Date
      2009-03-10
  • [Presentation] 雌性先熟魚ミツボシキュウセンHalichoeres tirmaculatusの性転換過程における細胞増殖2009

    • Author(s)
      野津了
    • Organizer
      海産無脊椎動物研究会
    • Place of Presentation
      愛媛
    • Year and Date
      2009-03-10
  • [Presentation] サンゴ礁に生息する魚類の性転換2009

    • Author(s)
      中村將
    • Organizer
      国際シンポジウム・海生動物の繁殖
    • Place of Presentation
      沖縄県本部町
    • Year and Date
      2009-02-21
  • [Presentation] コイ雌生殖腺の性的可塑性 卵巣内における精子形成の誘導2008

    • Author(s)
      小川智史
    • Organizer
      第33回日本比較内分泌学会大会
    • Place of Presentation
      広島大学(広島)
    • Year and Date
      20081205-20081206
  • [Presentation] 雌性先熟魚ミツボシキュウセンにおけるFoxl2の発現変化2008

    • Author(s)
      小林靖尚
    • Organizer
      琉球大学熱帯生物圏研究センター平成20年度共同利用研究会
    • Place of Presentation
      沖縄県西表
    • Year and Date
      20081029-20081031
  • [Presentation] Somatic cell differentiation during gonadal differentiation in the teleost fish2008

    • Author(s)
      Kobayashi, T
    • Organizer
      琉球大学熱帯生物圏研究センター平成20年度共同利用研究会
    • Place of Presentation
      沖縄県西表
    • Year and Date
      20081029-20081031
  • [Presentation] 浮遊性をもつ造礁サンゴ卵における脂質成分の分析2008

    • Author(s)
      三田雅敏
    • Organizer
      琉球大学熱帯生物圏研究センター平成20年度共同利用研究会
    • Place of Presentation
      沖縄県西表
    • Year and Date
      20081029-20081031
  • [Presentation] 成魚雌ティラピアにおけるアロマターゼ阻害剤による性転換誘導2008

    • Author(s)
      小島豊
    • Organizer
      琉球大学熱帯生物圏研究センター平成20年度共同利用研究会
    • Place of Presentation
      沖縄県西表
    • Year and Date
      20081029-20081031
  • [Presentation] 雌性先熟魚ミツボシキュウセンDMRT1のクローニング及び性転換過程における発現解析2008

    • Author(s)
      堀口涼
    • Organizer
      琉球大学熱帯生物圏研究センター平成20年度共同利用研究会
    • Place of Presentation
      沖縄県西表
    • Year and Date
      20081029-20081031
  • [Presentation] ヤイトハタEpinephelus malabaricusの性分化機構の解明と稚魚期での早期性転換誘導の試み2008

    • Author(s)
      村田良介
    • Organizer
      琉球大学熱帯生物圏研究センター平成20年度共同利用研究会
    • Place of Presentation
      沖縄県西表
    • Year and Date
      20081029-20081031
  • [Presentation] Gonadal maturation and lunar-related spawning in the honeycomb grouper, Epinephelus merra.2008

    • Author(s)
      Kiyoshi Soyano
    • Organizer
      5^<th> World Fisheries Congress
    • Place of Presentation
      Yokohama, Japan
    • Year and Date
      20081020-20081025
  • [Presentation] Physiologic research on sex change in the important aquaculture fish : protandrous grouper, Epinephelus merra.2008

    • Author(s)
      Yasuhisa Kobayashi
    • Organizer
      5^<th> World Fisheries Congress
    • Place of Presentation
      Yokohama, Japan
    • Year and Date
      20081020-20081025
  • [Presentation] Molecular character patterns during sex cization of estrogen receptor a. bl and b2 and their expressionhange in the protogynous wrasse, Halichoeres trimaculatus2008

    • Author(s)
      Ryo Horiguchi
    • Organizer
      5th International Meeting on Reproductive Biology of Aquatic Animals of the East China Sea Jeju
    • Place of Presentation
      Jeju, Korea
    • Year and Date
      20080910-20080911
  • [Presentation] 魚類の性決定・性分化とステロイドホルモン2008

    • Author(s)
      長濱嘉孝
    • Organizer
      日本動物学会第79大会
    • Place of Presentation
      福岡大学(福岡)
    • Year and Date
      20080905-20080907
  • [Presentation] 精巣構成細胞の性的可塑性2008

    • Author(s)
      小林 亨
    • Organizer
      日本動物学会第79大会
    • Place of Presentation
      福岡大学(福岡)
    • Year and Date
      20080905-20080907
  • [Presentation] Molecular cloning and expression of Fox12 in the protogynous wrasse, Halichoeres trimaculatus.2008

    • Author(s)
      Kobayashi Y
    • Organizer
      6th International Symposium on Fish Endocrinology.
    • Place of Presentation
      Calgary, Canada
    • Year and Date
      20080600
  • [Presentation] Endocrine and molecular control of sex change in grouper.2008

    • Author(s)
      Mohammad Ashraful Alam
    • Organizer
      International Symposium on Sex Determination and Gametogenesis in Fish : Current Status and Future Directions.
    • Place of Presentation
      Honolulu, Hawaii
    • Year and Date
      20080530-20080601
  • [Presentation] In vivo and in vitro studies of bidirectional sex change in the gonads of thehermaphrodite wrasse.2008

    • Author(s)
      Kohei Ohta
    • Organizer
      International Symposium on Sex Determination and Gametogenesis in Fish : Current Status and Future Directions.
    • Place of Presentation
      Honolulu, Hawaii
    • Year and Date
      20080530-20080601
  • [Presentation] Sex reversal of the adult gonochoristic fish nile tilapia : evidence for the existence of sexual plasticity in adult gonads.2008

    • Author(s)
      Ramji Bhandari
    • Organizer
      International Symposium on Sex Determination and Gametogenesis in Fish : Current Status and Future Directions.
    • Place of Presentation
      Honolulu, Hawaii
    • Year and Date
      20080530-20080601
  • [Presentation] Expression of estrogen receptors during sex change in the protogynous wrasse, Halichoeres trimaculatus.2008

    • Author(s)
      Ryo. Horiguchi
    • Organizer
      International Symposium on Sex Determination and Gametogenesis in Fish : Current Status and Future Directions.
    • Place of Presentation
      Honolulu, Hawaii
    • Year and Date
      20080530-20080601
  • [Presentation] Expression of forkhead transcriptional factor 2(fox12)in the protogynous wrasse, Halichoeres trimaculatus.2008

    • Author(s)
      Yasuhisa Kobayashi
    • Organizer
      International Symposium on Sex Determination and Gametogenesis in Fish : Current Status and Future Directions.
    • Place of Presentation
      Honolulu, Hawaii
    • Year and Date
      20080530-20080601
  • [Presentation] Short term treatment of aromatase inhibitor for the induction of sex change in protogynous three-spot wrasse(Halichoeres trimaculatus).2008

    • Author(s)
      Ryo Nozu
    • Organizer
      International Symposium on Sex Determination and Gametogenesis in Fish : Current Status and Future Directions.
    • Place of Presentation
      Honolulu, Hawaii
    • Year and Date
      20080530-20080601
  • [Presentation] Sexual plasticity in the ovary of common carp(Cyprinus carpio).2008

    • Author(s)
      Satoshi Ogawa
    • Organizer
      International Symposium on Sex Determination and Gametogenesis in Fish : Current Status and Future Directions.
    • Place of Presentation
      Honolulu, Hawaii
    • Year and Date
      20080530-20080601
  • [Presentation] Ovarian development and spawning with lunar periodicity in the honeycomb grouper.2008

    • Author(s)
      Kiyoshi Soyano
    • Organizer
      International Symposium on Sex Determination and Gametogenesis in Fish : Current Status and Future Directions.
    • Place of Presentation
      Honolulu, Hawaii
    • Year and Date
      20080530-20080601
  • [Presentation] A TGF-beta superfamily protein(MR-2)induces testicular differentiation as the formation of seminiferous tubule structure in Nile tilapia.2008

    • Author(s)
      Kobayashi, T
    • Organizer
      International Symposium on Sex Determination and Gametogenesis in Fish : Current Status and Future Directions.
    • Place of Presentation
      Honolulu, Hawaii
    • Year and Date
      20080530-20080601

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Published: 2010-06-11   Modified: 2016-04-21  

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