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The dominant-negative effect of PTEN mutation has been described previously, suggesting that aberrant gain of function attributed to mutation might be more disastrous than deletion in respect to malignant potential. In present study, we explored the functional implications of hot spot mutations of PTEN in GBM tumors. Subcellular location of PTEN is important for its distinct function and spatial distribution within the cytoplasm is known to be associated with cellular locomotion. We evaluated the subcellular compartmentalization of different PTEN mutants and found that some PTEN mutants located at cellular edges of chemotaxing cells. Moreover, these PTEN mutations exhibited invasive phenotype, which was not disrupted by PI3K inhibitor, but microtubule inhibitors. This finding suggests that cytoskeletal assembly as a novel non-canonical pathway of PTEN, thus unraveling a novel therapeutic vulnerability of PTEN. Mutation-specific therapeutic options should be considered in treating GBM patients with PTEN mutations.

CBIO-04. MUTATION-SPECIFIC NON-CANONICAL PATHWAY OF PTEN AS A DISTINCT THERAPEUTIC TARGET FOR GLIOBLASTOMA