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Functional characterization of cancer-associated Gab1 mutations
C Ortiz-Padilla1, D Gallego-Ortega, B C Browne
1Cancer Research Program, Garvan Institute of Medical Research, Sydney, New South Wales, Australia.
Oncogene
|July 4, 2012
Summary
Two breast cancer mutations in Gab1 (Grb2-associated binder 1) promote aberrant cell growth and morphology. The T387N mutation disrupts negative feedback, suggesting Gab1 signaling is a target in cancer progression.
Area of Science:
- Molecular Biology
- Cell Biology
- Oncology
Background:
- Grb2-associated binder 1 (Gab1) is a docking protein involved in signal transduction from receptor tyrosine kinases like Met and EGFR.
- While Gab2 is linked to cancer, Gab1's role has been less defined.
- Two Gab1 mutations, Y83C and T387N, were identified in breast cancer screens.
Purpose of the Study:
- To functionally characterize the identified Gab1 Y83C and T387N mutants.
- To investigate the impact of these mutations on mammary epithelial cell phenotype, proliferation, and signaling.
- To elucidate the mechanism by which these mutations contribute to cancer progression.
Main Methods:
- Overexpression of wild-type Gab1 and Gab1 mutants (Y83C, T387N) in MCF-10A and HC11 mammary epithelial cells.
- Phenotypic analysis, monolayer and Matrigel culture assays.
- Assessment of Erk activation and Gab1 phosphorylation sites via mass spectrometry.
- Analysis of public cancer mutation databases.
Main Results:
- Gab1 mutants induced a fibroblastic phenotype and EGF-independent proliferation.
- Mutant Gab1 expression enhanced aberrant acini formation and branching morphogenesis in Matrigel.
- Mutants modestly increased Erk activation.
- T387 phosphorylation was detected and modulated by EGF/HGF, suggesting T387N disrupts negative feedback.
Conclusions:
- Aberrant Gab1 signaling, driven by mutations like T387N, directly contributes to breast cancer progression.
- Negative feedback sites in docking proteins represent potential targets for oncogenic mutations.
- Gab1 mutations can alter cell morphology and promote uncontrolled proliferation and aberrant tissue architecture.
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