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Early mouse endoderm is patterned by soluble factors from adjacent germ layers
1Department of Molecular and Cellular Biology, Howard Hughes Medical Institute, Harvard University, Cambridge, Massachusetts 02138, USA. wells@biohp.harvard.edu
Development (Cambridge, England)
|March 22, 2000
Summary
Adjacent embryonic germ layers provide crucial signals for endoderm development. Mesoderm and ectoderm guide the formation of the respiratory and digestive tracts, influencing gene expression and organogenesis.
Area of Science:
- Developmental biology
- Embryogenesis
- Molecular signaling
Background:
- Endoderm forms the respiratory and digestive tracts from a cell sheet in early mouse embryos.
- This endoderm folds into a primitive gut tube, initiating organ development.
Purpose of the Study:
- To identify signals directing the developmental specification of early endoderm.
- To understand the role of adjacent germ layers in endoderm differentiation.
Main Methods:
- In vitro assay using germ layer explants.
- Analysis of organ-specific gene expression in endoderm.
- Investigating the effect of FGF4 concentration on endoderm differentiation.
Main Results:
- Adjacent germ layers secrete soluble, temporally specific signals.
- These signals induce organ-specific gene expression in endoderm.
- FGF4 from primitive streak-mesoderm induces endoderm differentiation in a concentration-dependent manner.
Conclusions:
- Gastrulation-stage endoderm differentiation is directed by adjacent mesoderm and ectoderm.
- This represents an early patterning event in vertebrate gut tube formation.