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Bmp-4 acts as a morphogen in dorsoventral mesoderm patterning in Xenopus
R Dosch1, V Gawantka, H Delius
1Division of Molecular Embryology, Deutsches Krebsforschungszentrum, Im Neuenheimer Feld 280, Heidelberg, Germany.
Development (Cambridge, England)
|June 1, 1997
Summary
Bone morphogenetic protein-4 (Bmp-4) acts as a morphogen, patterning amphibian embryonic mesoderm. Graded Bmp-4 signaling, influenced by noggin, dictates cell fate and gene expression in the marginal zone.
Area of Science:
- Developmental biology
- Embryology
- Molecular biology
Background:
- The marginal zone in amphibian embryos is crucial for establishing dorsoventral mesodermal patterning.
- Bone morphogenetic protein-4 (Bmp-4) is hypothesized to specify ventral mesodermal cell fates.
Purpose of the Study:
- To investigate the role of Bmp-4 dosage in patterning mesodermal cell types and gene expression.
- To determine the graded requirement for Bmp signaling in mesodermal patterning.
- To explore the long-range activity of Bmp-4 and its modulation by noggin.
Main Methods:
- Dose-dependent application of Bmp-4 to early gastrula marginal zones.
- Analysis of mesodermal cell type differentiation.
- Monitoring of gene expression patterns in the marginal zone.
- Investigating the interaction between Bmp-4 and noggin.
Main Results:
- Specific Bmp-4 concentrations patterned four distinct mesodermal cell types.
- Bmp-4 treatment resulted in three distinct gene expression domains in the marginal zone.
- A graded requirement for Bmp signaling was observed in mesodermal patterning.
- Bmp-4 demonstrated long-range activity, with its gradient formation antagonized by noggin.
Conclusions:
- Bmp-4 functions as a morphogen in the dorsoventral patterning of mesoderm.
- The interplay between Bmp-4 and noggin establishes signaling gradients crucial for embryonic development.