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A central role for the notochord in vertebral patterning.

Angeleen Fleming1, Roger Keynes, David Tannahill

  • 1Department of Anatomy, University of Cambridge, Downing Street, Cambridge CB2 3DY, UK.

Development (Cambridge, England)
|January 23, 2004
PubMed
Summary

Vertebral development in zebrafish reveals the notochord, not somites, secretes bone matrix for centra formation. This challenges the traditional resegmentation model for all vertebrates.

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Area of Science:

  • Developmental Biology
  • Comparative Vertebrate Anatomy
  • Skeletal Biology

Background:

  • Vertebral columns exhibit segmentation, with periodicity linked to embryonic somites.
  • The established 'resegmentation' model proposes vertebrae form from adjacent sclerotome halves.
  • This model's universality across vertebrates, especially non-amniotes, remains unconfirmed.

Purpose of the Study:

  • To investigate the embryonic origin of vertebral bodies (centra) in zebrafish.
  • To determine the role of somites versus the notochord in centrum formation.
  • To test the applicability of the resegmentation model in a non-amniote vertebrate.

Main Methods:

  • Zebrafish (Danio rerio) as a model organism.
  • In vitro culture of isolated notochords to assess matrix secretion.
  • Targeted ablation of notochord cells in vivo.
  • Analysis of vertebral patterning in fss mutant embryos with disrupted sclerotome segmentation.

Main Results:

  • Zebrafish centra form via bone matrix secretion directly from the notochord.
  • Centra development does not involve a cartilage intermediate or osteoblasts.
  • In vitro notochord cultures secrete bone matrix; in vivo notochord ablation prevents centrum formation.
  • Disruption of sclerotome segmentation (fss mutants) does not impede centrum development, while neural arch segmentation is affected.

Conclusions:

  • The notochord, not somites, is the primary source of bone matrix for zebrafish centra.
  • Findings challenge the universal applicability of the somite-based resegmentation model for vertebral centra.
  • The notochord plays a crucial, potentially ancestral, role in segmental vertebral patterning across vertebrates.

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