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Area of Science:

  • Evolutionary Developmental Biology
  • Genomics
  • Comparative Biology

Background:

  • The chordate body plan's evolution has been a long-standing scientific question.
  • Developmental Gene Regulatory Networks (GRNs) are key to understanding tissue and body axis development.
  • Deuterostomia, the superphylum including chordates, offers insights into early chordate evolution.

Purpose of the Study:

  • To revisit the development and evolution of chordates.
  • To discuss the evolution of the unique chordate body plan.
  • To synthesize current ideas on chordate origins based on recent genomic data.

Main Methods:

  • Genomic and transcriptomic analyses of major deuterostome clades (echinoderms, hemichordates, tunicates, lancelets, vertebrates).
  • Phylogenomic analyses to determine evolutionary relationships.
  • Synthesis of findings presented at the SICB 2024 meetings.

Main Results:

  • Genomic analyses reveal lancelets share similarities with vertebrates.
  • Phylogenomic analyses suggest tunicates are the sister group to vertebrates.
  • The evolution of tunicates likely involved a motile, lancelet-like ancestor.

Conclusions:

  • Modern genomic and transcriptomic data are crucial for elucidating chordate origins.
  • Comparative studies within Deuterostomia provide significant insights into chordate evolution.
  • The SICB 2024 meeting highlighted emerging themes in chordate development and evolution.