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Developmental system drift and flexibility in evolutionary trajectories.

J R True1, E S Haag

  • 1Laboratory of Molecular Biology, Howard Hughes Medical Institute, University of Wisconsin, Madison 53706, USA. jrtrue@facstaff.wisc.edu

Evolution & Development
|May 9, 2001
PubMed
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Evolutionary developmental biology often extrapolates from model organisms, but homologous traits can arise from different developmental processes. This "developmental system drift" (DSD) highlights evolutionary flexibility.

Area of Science:

  • Evolutionary developmental biology
  • Comparative genomics
  • Population genetics

Background:

  • Comparative analysis of homologous characters is crucial in evolutionary developmental biology.
  • Extrapolation from model organisms to non-model organisms is common but requires validation.
  • Understanding divergence in developmental processes is key to assessing model organism data relevance.

Purpose of the Study:

  • To investigate the frequency and extent of divergent developmental processes underlying similar phenotypes across taxa.
  • To evaluate the general importance of data obtained from model organisms in evolutionary studies.
  • To introduce and define the concept of "developmental system drift" (DSD).

Main Methods:

  • Comparative studies of distantly related species.

Related Experiment Videos

  • Genetic analysis of closely related species.
  • Review of population genetics and molecular mechanisms of DSD.

    • Main Results:

    • Many homologous characters exhibit divergence in their morphogenetic or gene regulatory underpinnings.
    • Developmental system drift (DSD) is a ubiquitous evolutionary process.
    • DSD implies significant plasticity in developmental evolution and responses to natural selection.

    Conclusions:

    • Homologous traits can evolve through distinct developmental pathways, challenging direct extrapolation.
    • Developmental system drift is a fundamental mechanism influencing evolutionary trajectories.
    • Developmental systems possess inherent plasticity, allowing for diverse evolutionary adaptations.