PLCG2 and immune system disorder: Indeed, a number of gain of function mutations in PLCγ2 have been linked to immune disorders, including PLAID (PLCγ2-associated antibody deficiency and immune dysregulation syndrome), APLAID (autoinflammation, antibody deficiency and immune dysregulation syndrome) and FCAS3 (familial cold autoinflammatory syndrome), as well as a subset of CVID (common variable immunodeficiency) patients [29–36].