Fibroblast growth factor during mesoderm induction in the early chick embryo

Area of Science:

• Developmental Biology
• Molecular Biology
• Genomics

Background:

• Basic fibroblast growth factor (bFGF) is a key signaling molecule in embryonic development.
• Homologous bFGF genes are found across species, suggesting conserved functions.
• Understanding bFGF's role in early embryogenesis is critical for developmental biology.

Purpose of the Study:

• To isolate and characterize a chick genomic clone for bFGF.
• To investigate the expression patterns of bFGF during early chick embryogenesis.
• To determine the role of FGF signaling in mesoderm and axial structure formation.

Main Methods:

• Isolation of a chick genomic clone homologous to mammalian and Xenopus bFGF.
• RNA blot analysis to detect bFGF transcription.
• Immunolabeling to visualize bFGF protein distribution.
• In vitro culture of chick blastoderms with FGF inhibitors (heparin, suramin).

Main Results:

• Chick bFGF is transcribed at pregastrula stages.
• bFGF protein is present and evenly distributed in the early chick blastula.
• FGF inhibition dose-dependently blocked mesodermal structure formation.
• FGF signaling appears necessary for both non-axial mesoderm induction and axial structure development.

Conclusions:

• FGF signaling is essential for early chick embryonic development, including mesoderm formation.
• bFGF plays a critical role in the induction of non-axial mesoderm.
• FGF-like substances are likely required for the development of axial structures in chick embryos.