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An inductive interaction in 4-cell stage C. elegans embryos involves APX-1 expression in the signalling cell
K M Mickey1, C C Mello, M K Montgomery
1Molecular and Cellular Biology Program, Division of Basic Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA 98104, USA.
Development (Cambridge, England)
|June 1, 1996
Summary
The P2 blastomere signal in C. elegans embryogenesis is crucial for differentiating sister cells. APX-1 protein in the P2 cell is identified as the key signal for this cell fate determination.
Area of Science:
- Developmental biology
- Cell signaling
- C. elegans embryogenesis
Background:
- In C. elegans, the P2 blastomere signals to equivalent sister blastomeres ABa and ABp, directing their distinct cell fates.
- Mutations in glp-1 and apx-1 genes, homologs of Notch and Delta, cause ABp developmental defects similar to P2 signaling inhibition.
- GLP-1 protein is present in both ABa and ABp blastomeres at the 4-cell stage.
Purpose of the Study:
- To investigate the role of APX-1 in P2 signaling during C. elegans embryogenesis.
- To determine the expression pattern of APX-1 protein and its temporal requirement for ABp fate specification.
Main Methods:
- Immunohistochemical analysis to detect APX-1 protein expression.
- Utilizing a temperature-sensitive apx-1 mutant to define the critical period for its function.
Main Results:
- APX-1 protein is localized to the P2 blastomere.
- The temperature-sensitive period for apx-1 function spans from the 4-cell to the 8-cell stage.
- Loss of apx-1 function leads to ABp developmental defects.
Conclusions:
- APX-1 is a component of the P2 signal that specifies ABp cell fate.
- The findings suggest APX-1 acts as or is part of the ligand mediating cell-cell communication for fate determination.