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Evolutionary issues in craniofacial biology.

B K Hall1

  • 1Department of Biology, Dalhousie University, Halifax, Nova Scotia, Canada.

The Cleft Palate Journal
|April 1, 1990
PubMed
Summary
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Evolutionary changes in vertebrate craniofacial development stem from epigenetic interactions, not genetic changes in neural crest cells. Variations in developmental timing (heterochrony) drive craniofacial diversity.

Area of Science:

  • Evolutionary developmental biology
  • Comparative anatomy
  • Paleontology

Background:

  • Craniofacial development in vertebrates has ancient origins, tracing back to Ordovician jawless vertebrates.
  • The evolution of jaws and dentition involved complex developmental processes.
  • Neural crest cells are crucial for craniofacial skeletogenic and odontogenic tissues.

Purpose of the Study:

  • To provide an overview of evolution within the context of craniofacial development.
  • To explore the mechanisms driving craniofacial variation across vertebrate species.
  • To emphasize the role of epigenetic interactions and heterochrony in craniofacial evolution.

Main Methods:

  • Review of existing literature on vertebrate craniofacial development and evolution.

Related Experiment Videos

  • Discussion of the origins of craniofacial tissues from dermal denticles.
  • Analysis of neural crest cell behavior and epigenetic cascades.

    • Main Results:

    • Craniofacial tissues originate from the dermal denticles of early jawless vertebrates.
    • The rostrocaudal polarization of cranial neural crest cells is constant across vertebrates.
    • Craniofacial variation arises from epigenetic interactions, particularly epithelial-mesenchymal interactions.
    • Heterochrony (variation in developmental timing) is a key mechanism driving craniofacial evolution.

    Conclusions:

    • Vertebrate craniofacial diversity is primarily driven by epigenetic modifications of developmental processes.
    • Understanding epigenetic cascades and heterochrony is essential for comprehending craniofacial evolution.
    • The study highlights the interplay between conserved developmental pathways and evolutionary novelty.