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Mutations in the Caenorhabditis elegans let-23 EGFR-like gene define elements important for cell-type specificity and
R V Aroian1, G M Lesa, P W Sternberg
1Howard Hughes Medical Institute, Pasadena, CA.
The EMBO Journal
|January 15, 1994
Summary
The Caenorhabditis elegans let-23 gene, an epidermal growth factor receptor (EGFR), has distinct functional domains. Sequencing mutations reveals critical regions for receptor function, including specific domains for fertility and vulval induction.
Area of Science:
- Molecular Biology
- Genetics
- Developmental Biology
Background:
- The let-23 gene in C. elegans encodes an epidermal growth factor receptor (EGFR) tyrosine kinase.
- Mutations in let-23 result in five distinct phenotypes, with alleles affecting overall function or specific cell types.
Purpose of the Study:
- To identify critical sequences and regions for let-23 gene function in vivo.
- To delineate domains within the receptor's C-terminus responsible for specific cellular functions.
Main Methods:
- Sequencing of let-23 gene mutations.
- Analysis of mutant alleles affecting receptor function in Caenorhabditis elegans.
Main Results:
- The C-terminus of the let-23 receptor can be divided into at least three domains, each mediating distinct functions.
- Specific domains were identified for regulating hermaphrodite fertility and vulval induction.
- A single conserved residue in the ligand-binding domain is essential for in vivo function.
- Mutations in extracellular cysteines of the EGFR family can cause partial or complete loss of receptor function.
Conclusions:
- The let-23 EGFR C-terminus possesses functionally distinct domains crucial for specific developmental processes.
- Conserved residues and extracellular domains play critical roles in epidermal growth factor receptor signaling and function.