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Related Experiment Videos

FGF-2: apical ectodermal ridge growth signal for chick limb development

J F Fallon1, A López, M A Ros

  • 1Anatomy Department, University of Wisconsin, Madison 53706.

Science (New York, N.Y.)
|April 1, 1994
PubMed
Summary

The apical ectodermal ridge is crucial for amniote limb bud development. Fibroblast growth factor-2 (FGF-2) was identified as the key growth signal, sustaining limb development after ridge removal.

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Genetics

Background:

  • The apical ectodermal ridge (AER) is essential for amniote limb bud growth and elongation.
  • AER removal leads to mesodermal gene expression changes, patterned cell death, and limb truncation.

Purpose of the Study:

  • To investigate the molecular signals responsible for AER function in limb development.
  • To identify the specific fibroblast growth factor (FGF) involved in chick limb bud growth.

Main Methods:

  • Removal of the apical ectodermal ridge from chick limb buds.
  • Application of ectopic fibroblast growth factor-2 (FGF-2) to the mesoderm.
  • Bioassay to detect and quantify FGFs in limb bud extracts.

Main Results:

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  • Ectopic FGF-2 application sustained normal gene expression and cell viability after AER removal.
  • FGF-2 treatment allowed for relatively normal limb development despite AER removal.
  • FGF-2 was the sole detectable FGF in chick limb bud extracts.

Conclusions:

  • Fibroblast growth factor-2 (FGF-2) is the primary growth signal originating from the apical ectodermal ridge.
  • FGF-2 plays a critical role in regulating gene expression, cell viability, and overall limb development in amniotes.