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Experimental evolutionary study of limb morphogenesis by a constitutive approach

Research Project

Project/Area Number 17K19411
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Research Field Biology of Cells to Organisms, and related fields
Research InstitutionNational Institute of Genetics

Principal Investigator

SHIROISHI Toshihiko  国立遺伝学研究所, 遺伝形質研究系, 教授 (90171058)

Research Collaborator AMANO takanori  
MOURI kousuke  
Project Period (FY) 2017-06-30 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2018: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2017: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Keywords収斂形質 / 水掻き / Hm変異 / Shh遺伝子 / エンハンサー / ゲノム挿入 / BMPシグナリング / FGFシグナリング / 収斂進化 / 指間皮膜形成 / シス制御配列 / 細胞死抑制 / 遺伝学 / ゲノム / シグナル伝達 / 発生制御 / 発生・分化 / 発現制御
Outline of Final Research Achievements

Interdigital webbing formation is a representative convergent feature found in many different species such as bat wings and frogs and waterfowl webbing. In this study, we used Hm mutant mice with interdigital webbing to elucidate the molecular mechanism of this convergent trait development. As a result, in the Hm mutation, it was revealed that inter-chromosomal insertion of an existing enhancer leads to formation of the interdigital webbing by acquisition of novel expression domain of Shh and consequent suppression of the downstream BMP signaling. However, in addition to the Hm mutation, overexpression of Fgf8 signaling failed to extend the phalange in mouse embryos. Thus, it turned out that it is necessary to control these signal molecules appropriately in order to change the skeletal pattern of the mouse limbs in a bat-like feature.

Academic Significance and Societal Importance of the Research Achievements

脊椎動物の付属肢は、手足、翼、ヒレなど個々の種に固有でありながら非常に多様な形態を示している。しかし、分子生物学的にその形態形成過程を見てみれば、共通の遺伝子ネットワークが同様なコンセプトに基づいて器官構築を行っている。したがって、付属肢の形態多様性を生み出すには、普遍的なシステムを構成する因子の量・場所・時間というパラメーターを変動させ、適正に再構築する必要があると考えられる。本申請研究は、上記仮説を実証し、種の形態多様性が生み出される分子的な仕組みを理解するため、実験的に動物の器官形態を作り変えることを目的として実施したものであり、学術的にはきわめて先駆的で挑戦的なものであった。

Report

(3 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • Research Products

    (1 results)

All 2017

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results)

  • [Journal Article] Enhancer adoption caused by genomic insertion elicits interdigitalShhexpression and syndactyly in mouse2017

    • Author(s)
      Mouri Kousuke、Sagai Tomoko、Maeno Akiteru、Amano Takanori、Toyoda Atsushi、Shiroishi Toshihiko
    • Journal Title

      Proceedings of the National Academy of Sciences

      Volume: 115 Issue: 5 Pages: 1021-1026

    • DOI

      10.1073/pnas.1713339115

    • Related Report
      2018 Annual Research Report 2017 Research-status Report
    • Peer Reviewed / Open Access

URL: 

Published: 2017-07-21   Modified: 2020-03-30  

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