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Related Experiment Videos

Cell-autonomous shift from axial to paraxial mesodermal development in zebrafish floating head mutants

M E Halpern1, C Thisse, R K Ho

  • 1Institute of Neuroscience, University of Oregon, Eugene 97403-1254, USA.

Development (Cambridge, England)
|December 1, 1995
PubMed
Summary

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Zebrafish floating head mutants fail to form notochord, instead developing muscle. The gene floating head is crucial for maintaining axial mesoderm development, not initiating it.

Area of Science:

  • Developmental biology
  • Genetics
  • Zebrafish models

Background:

  • The floating head (fhd) zebrafish mutant lacks a notochord, a critical axial structure.
  • This phenotype suggests potential defects in notochord specification or cell fate decisions during gastrulation.

Purpose of the Study:

  • To investigate the cellular and molecular mechanisms underlying the notochord defect in floating head zebrafish mutants.
  • To determine whether the floating head gene is required for the initiation or maintenance of notochord development.

Main Methods:

  • Analysis of floating head mutant embryos.
  • Construction and analysis of zebrafish genetic mosaics using wild-type and mutant cells.
  • Expression analysis of mesodermal markers during gastrulation.

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Main Results:

  • Floating head acts cell autonomously, with mutant cells failing to form notochord in wild-type hosts.
  • Axial mesoderm markers are initially expressed but not maintained in floating head mutants.
  • Mutant midline cells inappropriately express paraxial mesoderm markers, indicating cell fate respecification.

Conclusions:

  • The floating head gene is essential for maintaining the development of notochord-forming axial mesoderm.
  • Mutations in floating head lead to a respecification of axial mesoderm progenitors towards a muscle fate.
  • The gene plays a role in stabilizing cell identity during early mesoderm development.