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Developmental processes, developmental sequences and early vertebrate phylogeny.

R M Langille, B K Hall

    Biological Reviews of the Cambridge Philosophical Society
    |May 1, 1989
    PubMed
    Summary
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    Evolutionary history can be traced by analyzing conserved developmental sequences, not de novo occurrences. This study reconstructs vertebrate origins using neuralization and cephalization, highlighting developmental constraints in evolution.

    Area of Science:

    • Developmental Biology
    • Evolutionary Biology
    • Genetics

    Background:

    • Fundamental developmental sequences are highly conserved within species.
    • These sequences act as developmental constraints, guiding evolutionary change rather than arising anew.
    • Analyzing these conserved sequences can reveal evolutionary pathways.

    Purpose of the Study:

    • To demonstrate the utility of developmental data in reconstructing evolutionary history.
    • To propose an evolutionary sequence for vertebrate origins based on conserved developmental processes.
    • To investigate the roles of neuralization and cephalization in early vertebrate evolution.

    Main Methods:

    • Analysis of fundamental developmental sequences in conserved groups.
    • Reconstruction of evolutionary pathways using developmental data.

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  • Focus on neuralization and cephalization processes, including neural crest and epidermal placodes.

    • Main Results:

    • A step-by-step evolutionary sequence for vertebrate origins was generated using developmental data.
    • Sequence (a): Chordamesoderm induction of the neural tube (present in protochordates).
    • Sequence (b): Neural tube differentiation into brain and spinal cord (early protochordates).
    • Sequence (c): Cephalization via neural crest and epidermal placodes, defining true vertebrates (branchiates).

    Conclusions:

    • Conserved developmental sequences provide a robust method for deducing evolutionary history.
    • Neuralization and cephalization, driven by neural crest and epidermal placodes, were critical steps in vertebrate evolution.
    • The proposed sequence highlights how developmental constraints shape evolutionary trajectories.