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Related Experiment Videos

Molluscan engrailed expression, serial organization, and shell evolution.

D K Jacobs1, C G Wray, C J Wedeen

  • 1Department of Organismal Biology, Ecology, and Evolution, University of California, Los Angeles 90095-1606, USA. djacobs@ucla.edu

Evolution & Development
|March 21, 2001
PubMed
Summary
This summary is machine-generated.

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Serial features in molluscs are ancestral, supported by iterated engrailed-gene expression in ectodermal cells during skeletogenesis. This suggests a single evolutionary origin for invertebrate skeletons, potentially explaining Cambrian fossil appearances.

Area of Science:

  • Developmental Biology
  • Evolutionary Biology
  • Genetics

Background:

  • The evolutionary origin of serial features in molluscs, such as serial repetition, remains debated.
  • Understanding the genetic basis of skeletogenesis is crucial for evolutionary insights.

Purpose of the Study:

  • To investigate the ancestral or derived nature of serial features in molluscs.
  • To explore the role of the engrailed gene in invertebrate skeletogenesis and serial element development.

Main Methods:

  • In situ hybridization and antibody studies were employed.
  • Gene expression patterns of the engrailed gene were analyzed in chitons and clams.

Main Results:

  • Iterated engrailed-gene expression was observed in ectodermal cells associated with plate field development, spicule formation, and shell hinge development.
Keywords:
NASA Discipline ExobiologyNon-NASA Center

Related Experiment Videos

  • Ectodermal engrailed expression links skeletogenesis across diverse bilaterian phyla.

    • Conclusions:

    • The findings suggest a single evolutionary origin for invertebrate skeletons, with engrailed gene function playing a conserved role.
    • This shared ancestry may explain the rapid diversification of shelly fossils during the Cambrian period.