Molecular and Functional Characterization of Three Different Postzygotic Mutations in PIK3CA-Related Overgrowth Spectrum (PROS) Patients: Effects on PI3K/AKT/mTOR Signaling and Sensitivity to PIK3 Inhibitors
[Paper-level Aggregated] PMCID: PMC4411002
Evidence Type(s): Oncogenic, Functional
Justification: Oncogenic: The presence of PIK3CA mutations, specifically c.241 G>A [p.E81K], c.3140 A>G [p.H1047R], and c.3140 A>T [p.H1047L], in patients with a clinical diagnosis of FAO suggests a role in tumorigenesis, as these mutations are associated with cancer-related pathways. Functional: The identification of specific mutations in PIK3CA and their varying frequencies in different tissue types indicates that these mutations may affect the function of the protein, contributing to the disease phenotype observed in the patients.
Gene→Variant (gene-first): PIK3CG(5294):3140 A>T PIK3CA(5290):c.3140 A>G PIK3CA(5290):c.3140 A>T PIK3CA(5290):p.H1047L PIK3CA(5290):p.H1047R PIK3CA(5290):c.241 G>A PIK3CA(5290):p.E81K
Genes: PIK3CG(5294) PIK3CA(5290)
Variants: 3140 A>T c.3140 A>G c.3140 A>T p.H1047L p.H1047R c.241 G>A p.E81K