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Related Experiment Videos

Morphological and developmental macroevolution: a paleontological perspective.

James W Valentine1, David Jablonski

  • 1Center for Integrative Genomics and Department of Integrative Biology, University of California, Berkeley, California 94720, USA. jwvsossi@socrates.berkeley.edu

The International Journal of Developmental Biology
|February 6, 2004
PubMed
Summary
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Fossil and genomic data reveal conserved developmental systems in metazoans, suggesting early origins for body plan patterning. This research links evolutionary changes in Hox clusters to the diversification of bilaterian phyla during the Cambrian explosion.

Area of Science:

  • Evolutionary biology
  • Paleontology
  • Developmental genetics

Background:

  • Metazoan morphological evolution is documented in the fossil record over the last 600 million years.
  • Despite extinctions, genomic comparisons indicate conserved developmental systems for body plans in higher taxa.
  • Understanding the interplay between morphological and genomic disparity is crucial for evolutionary insights.

Purpose of the Study:

  • To investigate the relationship between morphological evolution evidenced in the fossil record and genomic disparity in extant taxa.
  • To explore the role of conserved developmental systems in metazoan body plan patterning.
  • To elucidate the timing and mode of origin for genomic disparities in relation to major evolutionary events.

Main Methods:

  • Analysis of fossil records to infer morphological evolution and diversification timelines.

Related Experiment Videos

  • Genomic comparisons of surviving metazoan taxa to assess conserved developmental systems.
  • Integration of paleontological and genomic data to correlate evolutionary events.

    • Main Results:

    • Hox cluster composition varies across major taxa, with evidence suggesting early Neoproterozoic changes.
    • These Hox cluster alterations are potentially linked to the evolution of early bilaterian phyla preceding the Cambrian explosion.
    • Conserved developmental systems underpin body plan patterning throughout metazoan history.

    Conclusions:

    • The study highlights the deep conservation of developmental systems in metazoans.
    • It proposes that significant genomic changes, particularly in Hox clusters, occurred early in metazoan evolution, influencing the Cambrian explosion.
    • Integrating fossil and genomic data provides a powerful approach to understanding the origins of biological diversity.