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Related Experiment Videos

Endoderm specification and differentiation in Xenopus embryos.

M E Horb1, J M Slack

  • 1Developmental Biology Programme, Department of Biology and Biochemistry, University of Bath, BA2 7AY, United Kingdom. m.horb@bath.ac.uk

Developmental Biology
|July 31, 2001
PubMed
Summary

Xenopus endoderm development is not autonomous. Regional specification requires inductive signals from mesoderm, challenging previous models of cell-autonomous development. This finding impacts understanding of early gut formation.

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Area of Science:

  • Developmental Biology
  • Embryology
  • Cell Signaling

Background:

  • Regional specification of the gut in amniote embryos relies on mesoderm-endoderm signaling.
  • Recent Xenopus studies proposed autonomous endoderm regional specification before gastrulation.

Purpose of the Study:

  • To investigate Xenopus endoderm specification and differentiation at neurula and tail-bud stages.
  • To re-evaluate the hypothesis of stable autonomous regional specification in Xenopus endoderm.

Main Methods:

  • Isolation of endoderm from neurula and tail-bud stage Xenopus embryos.
  • Recombination experiments between isolated mesoderm and endoderm.
  • Analysis of regional specification and differentiation markers.

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Main Results:

  • Isolated Xenopus endoderm does not express regional or differentiation markers.
  • Co-culture with mesoderm induces regional marker expression in endoderm.
  • Endodermal marker expression reflects the regional character of the co-cultured mesoderm.

Conclusions:

  • The hypothesis of stable autonomous regional specification of Xenopus endoderm is incorrect.
  • Mesoderm-derived inductive signals are crucial for endoderm regional specification.
  • Stable regional specification of the endoderm occurs late, influenced by mesodermal signals.