PHKG1 Cancer Research Results

PHKG1 (phosphorylase kinase catalytic subunit gamma 1) is the catalytic gamma subunit of phosphorylase kinase, a serine/threonine kinase complex that activates glycogen phosphorylase and thereby promotes glycogenolysis. PHKG1 therefore links hormonal and calcium-dependent signalling with mobilization of stored glycogen and production of glucose-1-phosphate for energy metabolism. Because many tumour cells can use glycogen as a metabolic reserve during hypoxia, nutrient limitation and other stress, increased phosphorylase-kinase activity may support tumour metabolic adaptation. However, PHKG1 itself is not yet established as a broadly oncogenic driver or therapeutic target across cancers. Its cancer-associated direction should therefore be considered context-dependent or insufficiently established unless a study directly demonstrates PHKG1 upregulation, activation or dependency. PHKG1 is separate from PHKG2 and from downstream glycogen phosphorylases such as PYGL, PYGB and PYGM.