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Updated: Apr 22, 2026

Selected Reaction Monitoring Mass Spectrometry for Absolute Protein Quantification
Published on: August 17, 2015
The double life of p85
Carlotta Costa1, Jeffrey A Engelman1
1Massachusetts General Hospital Cancer Center, Harvard Medical School, Charlestown, MA 02129, USA.
Two new PIK3R1 gene mutations common in endometrial and colon cancers were identified. These mutations drive cancer growth through pathways independent of PI3K signaling.
Area of Science:
- Genetics
- Molecular Biology
- Oncology
Background:
- Mutations in PIK3R1, encoding the p85α regulatory subunit of PI3K, are increasingly found in various cancers.
- Understanding the functional impact of these mutations is crucial for developing targeted therapies.
Purpose of the Study:
- To identify and characterize novel PIK3R1 mutations in endometrial and colon cancer.
- To elucidate the mechanisms by which these mutations promote cancer development.
Main Methods:
- Genetic sequencing to identify PIK3R1 mutations.
- Functional assays to assess the impact of mutations on cellular transformation.
- Analysis of signaling pathways downstream of PI3K.
Main Results:
- Discovery of two neomorphic PIK3R1 mutants frequently observed in endometrial and colon cancers.
- Demonstration that these mutants induce cellular transformation.
- Evidence that transformation is mediated by PI3K-independent pathways.
Conclusions:
- Neomorphic PIK3R1 mutations represent a distinct mechanism of oncogenesis in specific cancer types.
- Targeting PI3K-independent pathways may offer new therapeutic strategies for cancers harboring these mutations.
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