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Author Spotlight: Understanding Microbe Adaptation Using Innovative Techniques for Exploring Thermophilic Evolution
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Extreme phenotypic divergence and the evolution of development.

Gregory A Wray1

  • 1Department of Biology, Duke University, Durham, NC, United States.

Current Topics in Developmental Biology
|February 14, 2022
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Area of Science:

  • Developmental biology
  • Evolutionary developmental biology
  • Marine biology

Background:

  • Understanding evolutionary changes in developmental mechanisms across species is crucial.
  • Closely related species with divergent phenotypes offer insights into evolutionary processes.
  • Echinoderms, particularly sea urchins, provide a model for studying conserved and altered developmental pathways.

Purpose of the Study:

  • To investigate the evolutionary drivers of developmental changes in closely related sea urchin species.
  • To understand why developmental mechanisms change or remain conserved during evolution.
  • To examine the role of natural selection in shaping developmental plasticity.

Main Methods:

  • Comparative analysis of developmental mechanisms in closely related sea urchin species.
  • Focus on species within the genus Heliocidaris, which exhibit divergent life histories (feeding vs. nonfeeding larvae).
  • Examination of evolutionary shifts in developmental pathways following a major life history transition.

Main Results:

  • Rapid and extensive modifications in developmental mechanisms were observed in species with nonfeeding larvae.
  • These changes occurred despite a long history of conserved development in related species.
  • The findings challenge the idea of strict internal constraints on early development, highlighting developmental plasticity.

Conclusions:

  • Natural selection actively maintains developmental stability but also drives significant changes when selective regimes shift.
  • Developmental mechanisms are more malleable than previously assumed, with evolution readily modifying them.
  • Studying extreme evolutionary transitions, like the shift to nonfeeding larvae, reveals the interplay between selection and developmental evolution.