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Elucidation of molecular basis of sperm evolution in marine sculpin with different fertilization mode in the same genus.

Research Project

Project/Area Number 21K20676
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0703:Biology at organismal to population levels and anthropology, and related fields
Research InstitutionOsaka Metropolitan University (2022)
Osaka City University (2021)

Principal Investigator

Takeshi Ito  大阪公立大学, 大学院理学研究科, 特任助教 (10908429)

Project Period (FY) 2021-08-30 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords精子 / 受精様式 / 精子競争 / RNA seqence / カジカ科魚類 / 体内受精 / 体外受精 / 海産カジカ / 交尾 / RNA sequence
Outline of Research at the Start

体外受精から体内受精への進化は、脊椎動物が水圏から陸上へ進出するための極めて重要なイベントである。しかし、哺乳類はみな体内受精、カエルはほぼみな体外受精というように、受精様式の違いは系統的な制約が強く、精子形質の進化を促進する生態的・分子的要因を明らかにした研究は殆どない。
近縁種に異なる受精様式をもつ海産カジカ科魚類をモデルとし、繁殖様式の進化によって精子の分子基盤がどのように進化したか、精子の形態や運動性の違いがどのような機能的意義を持つのかを明らかにすることを目的とする。また、海産カジカ科魚類以外にも、少数ではあるが近縁種に異なる受精様式を持つ魚類がいるため、同様に分析を行う。

Outline of Final Research Achievements

This study revealed that sperm heads elongate during the evolution of internal fertilization in marine sculpin of both North American and Japanese species groups, which differ in phylogeny. To clarify the adaptive role of the elongated head, we analyzed sperm motility in solutions with different viscosities and found no evidence of head elongation in response to viscosity. On the other hand, in closely related species, sperm motility differed greatly between external fertilization and internal fertilization, with amplitude motility in externally fertilizing species and rotational motility in internally fertilizing species. In addition, the RNA sequences of sperm of Artedius, a genus which contain both externally and internally fertilizing species, allowed us to select candidate genes whose expression levels differed depending on the type of fertilization mode

Academic Significance and Societal Importance of the Research Achievements

これまで、精子の構成成分や受精そのものに関する研究は多くなされてきた。しかしながら、受精に至るまでの過程での精子の適応進化については見過ごされてきた。本研究は、進化生態学の観点から精子の適応進化を明らかにしただけでなく、精子形態の違いを機能面からも検証した研究である。そのため、複合的な視点から精子の適応機構を捉えることができた点で、学術的意義がある。加えて、RNA seqenceにより体外受精から体内受精種へ進化する際に発現量が変化した遺伝子の候補を選出することができた。これらの遺伝子を調べ体内受精に必要な要素を明らかにすることで、将来的に薬学への応用が期待できる。

Report

(3 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • Research Products

    (8 results)

All 2022 Other

All Int'l Joint Research (1 results) Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (5 results) (of which Int'l Joint Research: 2 results) Remarks (1 results)

  • [Int'l Joint Research] San Francisco State University/Department of Biology(米国)

    • Related Report
      2022 Annual Research Report
  • [Journal Article] Fertilization modes and the evolution of sperm characteristics in marine fishes: Paired comparisons of externally and internally fertilizing species.2022

    • Author(s)
      Takeshi I., Morita M., Okuno S., Inaba H., Shiba K., Munehara H., Koya Y., Homma M., Awata S.
    • Journal Title

      Ecology and Evolution

      Volume: 12 Issue: 12 Pages: 1-8

    • DOI

      10.1002/ece3.9562

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Paired comparisons of eleven species with different fertilization modes reveal the evolution of sperm in marine fishes.2022

    • Author(s)
      Ito T,Morita M,Okuno S,Inaba K,Shiba K,Munehara H,Koya Y,Homma M,Awata S
    • Organizer
      The International Society for Behavioural Ecology Congress 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 体外受精vs体内受精:異なる系統の海産魚類における精子進化の一般性の検証2022

    • Author(s)
      伊藤岳, 守田昌哉, 柴小菊, 稲葉一男, 宗原弘幸, 山崎彩, 古屋康則, 本間光雄, 安房田智司
    • Organizer
      第69回日本生態学会大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 北米西岸に固有の交尾型海産カジカ Fluffy sculpin と姉妹種 Rosy sculpin の受精様式と雌雄の繁殖戦略2022

    • Author(s)
      伊藤岳;Breana Goldman;安房田智司;Karen D. Crow
    • Organizer
      2022年度日本魚類学会年会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 体外受精vs体内受精:異なる系統の海産⿂類における精⼦進化の⼀般性の検証2022

    • Author(s)
      伊藤岳・守田昌哉・柴小菊・稲葉一男・宗原弘幸・山崎彩・古屋康則・本間光雄・安房田智司
    • Organizer
      第69回日本生態学会大会
    • Related Report
      2021 Research-status Report
  • [Presentation] Paired comparisons of eleven species with different fertilization modes reveal the evolution of sperm in marine fishes.2022

    • Author(s)
      Ito T, Morita M, Okuno S., Inaba K, Shiba K., Munehara H., Koya Y., Homma M., & Awata S.
    • Organizer
      International Behavioral Ecology Congress (ISBE) 2022
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Remarks] 動物社会学研究室|大阪公立大学

    • URL

      https://www.omu.ac.jp/sci/biol-asoci/publication/index.html

    • Related Report
      2021 Research-status Report

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Published: 2021-10-22   Modified: 2024-01-30  

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