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Introduction to the Integumentary System01:25

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Author Spotlight: Insight into the Current Experimental Avian Skin Explant Methodologies
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Evo Devo of the Vertebrates Integument.

Danielle Dhouailly1

  • 1Department of Biology and Chemistry, Institute for Advanced Biosciences, University Grenoble-Alpes, 38700 La Tronche, France.

Journal of Developmental Biology
|June 27, 2023
PubMed
Summary

Vertebrate skin appendages like teeth, feathers, and scales evolved from a shared ancestral unit. This suggests a common origin for diverse skin structures in jawed vertebrates.

Area of Science:

  • Evolutionary developmental biology
  • Comparative anatomy
  • Vertebrate paleontology

Background:

  • Jawed vertebrates ancestrally possess teeth; diverse skin appendages (glands, hair, feathers, scales) distinguish major clades.
  • Amphibian multicellular glands' evolutionary origin remains unaddressed, unlike other skin appendages.
  • Previous dermal-epidermal recombination studies in amniotes revealed conserved developmental pathways for appendage type and morphogenesis.

Purpose of the Study:

  • To investigate the evolutionary origin of vertebrate skin appendages, including amphibian glands.
  • To determine if diverse skin appendages evolved from a common ancestral structure.

Main Methods:

  • Review and synthesis of historical dermal-epidermal recombination experiments.
  • Integration of molecular biology findings on developmental pathways.
Keywords:
corneadevelopmentevolutionfeatherhairplacodereticulascaletooth

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  • Comparative analysis of skin appendage development across vertebrate clades.

    • Main Results:

    • Epidermis determines appendage type; dermal messages guide morphogenesis.
    • Early developmental messages for skin appendages are conserved across amniotes.
    • Molecular pathways suggest parallel evolution of teeth and dermal scales from a shared unit.

    Conclusions:

    • Diverse vertebrate skin appendages, including teeth, scales, feathers, and glands, likely evolved in parallel.
    • These appendages originated from a shared placode/dermal cell unit present in a common toothed ancestor approximately 420 million years ago.