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Xl erg: expression pattern and overexpression during development plead for a role in endothelial cell

M Baltzinger1, A M Mager-Heckel, P Remy

  • 1Mécanismes Moléculaires de la Division Cellulaire et du Développement, CNRS, Strasbourg, France. baltzinger@ibmc.u-strasbg.fr

Developmental Dynamics : an Official Publication of the American Association of Anatomists
|January 14, 2000
PubMed
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The Xenopus erg gene (Xl erg) plays a crucial role in embryonic development, particularly in blood vessel and circulatory system formation. Its misexpression leads to significant developmental defects, highlighting its importance in cell motility and vascular development.

Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Genetics

Background:

  • The ets gene family, including proto-oncogene c-ets-1, regulates critical cellular processes like proliferation and differentiation.
  • Understanding the function of ets-related genes is vital for insights into developmental pathways and oncogenesis.

Purpose of the Study:

  • To characterize the Xenopus homologue of the human erg gene (Xl erg) and investigate its role during early embryonic development.
  • To examine the expression patterns and functional consequences of Xl erg misexpression in Xenopus embryos.

Main Methods:

  • Characterization of the Xl erg gene and its protein products through analysis of alternative splicing.
  • Examination of Xl erg expression patterns in developing Xenopus embryos using in situ hybridization.

Related Experiment Videos

  • Ectopic expression of Xl erg via mRNA microinjection to observe developmental effects.

    • Main Results:

    • Xl erg encodes at least two proteins due to alternative splicing.
    • Xl erg transcripts are specifically localized to the developing endocardium, blood vessel endothelial cells, and neural crest-derived mesenchyme.
    • Ectopic Xl erg expression causes developmental abnormalities, including shortened AP axis, defective morphogenesis, posteriorization, and ectopic endothelial cell differentiation.

    Conclusions:

    • Xl erg is essential for normal embryonic development in Xenopus, particularly for the formation of the circulatory system.
    • The findings suggest Xl erg's involvement in regulating cell motility and endothelial cell differentiation.
    • Aberrant Xl erg function leads to severe developmental defects, underscoring its critical role in vascular development.