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Epithelial cell polarity in early Xenopus development

H A Müller1, P Hausen

  • 1Max-Planck-Institut für Entwicklungsbiologie, Abteilung Zellbiologie, Tübingen, Federal Republic of Germany.

Developmental Dynamics : an Official Publication of the American Association of Anatomists
|April 1, 1995
PubMed
Summary

The Xenopus embryo

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Area of Science:

  • Developmental biology
  • Cell biology
  • Embryology

Background:

  • The Xenopus blastula exhibits early cell diversification into polarized surface epithelial cells and non-polarized inner cells.
  • Understanding the mechanisms driving this initial cell differentiation is crucial for developmental studies.

Purpose of the Study:

  • To investigate the factors determining cell polarization in the early Xenopus embryo.
  • To elucidate the role of the egg membrane in establishing apical-basolateral cell polarity.

Main Methods:

  • Single-cell analysis of blastomeres.
  • In vitro cell culture experiments.
  • Cell transplantation studies in Xenopus embryos.

Main Results:

  • Single blastomeres (1/64 cells) possess inherent apical and basolateral membrane domains.
  • In vitro culture shows that cells retaining egg membrane differentiate into polarized epithelial cells.
  • Transplanted cells incorporating egg membrane form polarized epithelial patches, while others do not.

Conclusions:

  • Egg membrane inheritance, not cell position, is critical for apical-basolateral differentiation in Xenopus blastula epithelium.
  • The egg membrane and submembrane cortex play a determinative role in blastula epithelial formation.

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