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Study on the evolution of the wing musculoskeletal system during the dinosaur-bird transition

Research Project

Project/Area Number 19K04061
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 17050:Biogeosciences-related
Research InstitutionThe University of Tokyo (2020-2021)
Institute of Physical and Chemical Research (2019)

Principal Investigator

Hirasawa Tatsuya  東京大学, 大学院理学系研究科(理学部), 准教授 (60585793)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords進化 / 脊椎動物 / 化石 / 恐竜 / 獣脚類 / 中生代 / 進化発生学 / 骨格筋 / 古生物学 / 胚発生 / 筋骨格系 / 腱
Outline of Research at the Start

進化において大規模な機能の獲得がどのような移行過程を経て起こりうるものなのかについての理解を進めるためのケーススタディーとして、恐竜(非鳥類恐竜)から鳥類への進化において、筋骨格系、特に、翼の動力部分である筋がどのような移行段階を経て進化したのかを研究する。翼の新規筋形態パターンが何から、どのような変化を経て獲得されたのかを、現生種における前肢筋の発生の比較解析を通じて探り、さらに、化石標本を調査することで、その変化過程を系統図上で復元することを目指す。

Outline of Final Research Achievements

The avian wing evolved from the forelimb of ancestral dinosaurs, and a new skeletal muscle, or the "propatagial muscle", spanning between the shoulder and wrirst along its leading edge, was acquired in the evolution of this lineage. In this study, we advanced the understanding of the evolutionary process of the propatagial muscle. First, we found that elbow joint angles preserved in fossils were limited to small values in the presence of the propatagial muscle, and based on this relationship, we analyzed the articulated fossil skeletons, eventually inferring that the propatagial muscle evolved prior to the evolutionary origin of the wing, in the non-avian dinosaurs (maniraptorans). Second, we examined the embryonic development of the chicken, and showed that the propatagial muscle was likely established through a fusion of the shoulder and forearm muscles at the evolutionary origin.

Academic Significance and Societal Importance of the Research Achievements

本研究により、鳥類の翼の筋骨格系進化についての理解が大きく進展した。恐竜から鳥類への移行に関して、単なる骨の形態からの復元ではなく、関節した状態で保存された骨格化石の姿勢(関節角度)を統計学的に比較することで、通常は化石に残らない筋(前翼膜筋)の進化について証拠を得たのは本研究が初である。また、同時並行で進めた発生学研究によって、前翼膜筋がどのように進化したのか解明が進んだが、これは脊椎動物の筋骨格系の進化における制約や方向性を理解していく上で重要な手がかりになると期待される。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (12 results)

All 2022 2021 2019 Other

All Int'l Joint Research (2 results) Journal Article (3 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (6 results) (of which Int'l Joint Research: 3 results,  Invited: 4 results) Book (1 results)

  • [Int'l Joint Research] Universidade do Estado do Rio de Janeiro(ブラジル)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Australian National University(オーストラリア)

    • Related Report
      2021 Annual Research Report
  • [Journal Article] Morphology of Palaeospondylus and its affinity to tetrapod ancestors2022

    • Author(s)
      Hirasawa T, Hu Y, Uesugi K, Hoshino M, Manabe M, Kuratani S
    • Journal Title

      Nature

      Volume: - Issue: 7912 Pages: 109-112

    • DOI

      10.1038/s41586-022-04781-3

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Development of the pectoral lobed fin in the Australian lungfish Neoceratodus forsteri2021

    • Author(s)
      Hirasawa T, Cupello C, Brito PM, Yabumoto Y, Isogai S, Hoshino M, Uesugi K
    • Journal Title

      Frontiers in Ecology and Evolution

      Volume: 9 Pages: 679633-679633

    • DOI

      10.3389/fevo.2021.679633

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Mammalian face as an evolutionary novelty2021

    • Author(s)
      Higashiyama H, Koyabu D, Hirasawa T, Werneburg I, Kuratani S, Kurihara H
    • Journal Title

      Proceedings of the National Academy of Sciences of the United States of America

      Volume: 118 Issue: 44

    • DOI

      10.1073/pnas.2111876118

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 化石に保存された前肢骨格関節角度の比較解析から探る獣脚類系統における前翼膜の進化2022

    • Author(s)
      宇野友里花, 平沢達矢
    • Organizer
      日本古生物学会第171回例会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 化石から探る脊椎動物の初期形態進化2022

    • Author(s)
      平沢達矢
    • Organizer
      第127回日本解剖学会総会・全国学術集会
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] Early evolution of the vertebrate morphology: a view from evolutionary developmental biology2021

    • Author(s)
      Hirasawa T
    • Organizer
      2nd AsiaEvo Conference
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] シンクロトロン放射光X線マイクロCTを駆使したデボン紀脊椎動物化石の骨格形態および微細組織構造の解析2021

    • Author(s)
      平沢達矢
    • Organizer
      化石研究会第39回学術大会
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] The mammalian diaphragm as an evolutionary novelty2021

    • Author(s)
      Hirasawa T
    • Organizer
      Palaeontological Virtual Congress
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Deciphering developmental constraints in limb muscles2019

    • Author(s)
      Hirasawa T, Kuratani S
    • Organizer
      79th Annual Meeting, Society of Vertebrate Paleontology
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Book] "Evolution of Skeletal Tissues" in Evolutionary Developmental Biology: A Reference Guide2021

    • Author(s)
      Hirasawa T, Kuratani S
    • Publisher
      Springer
    • ISBN
      9783319329772
    • Related Report
      2020 Research-status Report

URL: 

Published: 2019-04-18   Modified: 2023-01-30  

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