Phospholipase C gamma 1 (PLCG1)

Phospholipase C gamma 1 (PLCG1) is a **phosphoinositide-specific phospholipase** enzyme involved in intracellular signal transduction. It plays pivotal roles in regulating cell proliferation, migration, apoptosis, actin cytoskeleton organization, calcium signaling, and embryogenesis, primarily by hydrolyzing phosphatidylinositol 4,5-bisphosphate (PIP2) to produce the second messengers diacylglycerol (DAG) and inositol 1,4,5-trisphosphate (IP3)[1][2][3]. PLCG1 is **activated downstream of receptor and non-receptor tyrosine kinases**, such as EGFR and FGFR1, through phosphorylation on critical tyrosines (notably Tyr783), a process essential for its engagement in diverse signaling complexes via its SH2/SH3 domain array[1][2][4]. Deregulation of PLCG1 activity, including activating mutations or overexpression, has been implicated in the development and progression of cancer, autoimmune and inflammatory disorders, and certain neurodevelopmental conditions[1][2]. Although small molecules directly targeting PLCG1 are not yet used clinically, the enzyme is a **validated therapeutic target** due to its central regulatory role in many disease-relevant signaling pathways[1]. Its structural complexity and context-dependent interactions pose both scientific challenges and opportunities for future drug development.

Other names

PLC-γ1PLCgamma1PLCγ1PLC gamma 1

Inhibition of upstream tyrosine kinase phosphorylation to block PLCG1 activation[1][2]; Modulation of phosphoinositide signaling by suppressing PLCG1 enzymatic activity