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Related Experiment Videos

Bottle cell formation in relation to mesodermal patterning in the Xenopus embryo.

T Kurth1, P Hausen

  • 1Max-Planck-Institut für Entwicklungsbiologie, Abteilung Zellbiologie, Spemannstrasse 35/V, 72076, Tübingen, Germany.

Mechanisms of Development
|October 12, 2000
PubMed
Summary

Bottle cell formation in Xenopus embryos, crucial for blastopore formation, is triggered by high transforming growth factor-beta (TGF-β) signaling. Nodal-related factors and fibroblast growth factor (FGF) signaling are key regulators.

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Area of Science:

  • Developmental Biology
  • Cell Biology
  • Embryogenesis

Background:

  • Bottle cells appear at the dorsal vegetal/marginal boundary of Xenopus embryos, signaling the start of blastopore formation.
  • Understanding the molecular mechanisms driving bottle cell formation is crucial for comprehending early embryonic patterning.

Purpose of the Study:

  • To investigate the conditions and signaling pathways that induce bottle cell formation.
  • To determine the role of transforming growth factor-beta (TGF-β) and nodal-related factors in this process.

Main Methods:

  • Ectopic induction of bottle cells in the animal region of Xenopus embryos using VegT and TGF-β family members.
  • Morphological analysis of induced bottle cells and gene expression profiling of subepithelial cells.
  • Investigating the inhibitory effects of cerberus on ectopic bottle cell induction.

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Main Results:

  • Ectopically induced bottle cells closely resemble endogenous ones.
  • Subepithelial cells in induced regions express mesodermal genes, mirroring dorsal lip patterns.
  • Bottle cell formation occurs in areas of high TGF-β signaling, with nodal-related factors identified as intrinsic signals.

Conclusions:

  • Bottle cell formation is tightly linked to high TGF-β signaling.
  • Nodal-related growth factors are essential intrinsic signals for bottle cell induction.
  • Fibroblast growth factor (FGF) signaling is a prerequisite for bottle cell formation and mesoderm patterning.