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Related Experiment Videos

Morphological innovation through gene regulation: an example from Devonian Onychodontiform fish.

Kenton S W Campbell1, Richard E Barwick

  • 1Department of Earth and Marine Sciences, Australian National University, Canberra, Australia. ken.campbell@anu.edu.au

The International Journal of Developmental Biology
|March 10, 2006
PubMed
Summary

Novel phenotypic designs arise from gene regulation changes, impacting evolution. Studying these functional structures and their genetic origins provides crucial evolutionary insights, distinguishing homoplasies from synapomorphies.

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Area of Science:

  • Evolutionary biology
  • Developmental biology
  • Paleontology

Background:

  • Gene regulation changes drive novel phenotypic designs.
  • The fossil record reveals rapid appearance of new body plans.
  • Early Devonian lobe-finned fishes exemplify rapid diversification.

Purpose of the Study:

  • To analyze the evolutionary significance of novel phenotypic designs.
  • To differentiate between homoplasies and synapomorphies in evolutionary studies.
  • To understand how gene regulation impacts the origin of new functional structures.

Main Methods:

  • Analysis of fossil records, particularly the Early Devonian lobe-finned fishes.
  • Comparative character analysis across different sarcopterygian lineages.

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  • Investigating gene regulation's role in developing new functional structures.

    • Main Results:

    • Diverse lobe-finned fish groups (dipnoans, onychodontids, porolepiforms, osteolepiforms) appeared rapidly.
    • Independent evolution of these groups from an unspecified sarcopterygian ancestor.
    • Primitive genes were retained, leading to potential homoplasies mistaken for synapomorphies.

    Conclusions:

    • Careful character analysis is crucial to identify true synapomorphies and avoid homoplasies.
    • Studying functional structures and their genetic origins offers significant evolutionary information.
    • Understanding gene regulation's role is key to interpreting evolutionary patterns.