NCF1 (neutrophil cytosolic factor 1) is a critical regulatory subunit of the phagocyte NADPH oxidase complex that mediates electron transfer from cytosolic NADPH to molecular oxygen, producing superoxide anions essential for antimicrobial defense 1. The protein functions through phosphorylation-dependent binding to CYBA/p22-phox, enabling assembly of the cytosolic subunits with the membrane-bound NADPH oxidase complex at plasma or phagosomal membranes 1. Beyond its classical antimicrobial role, NCF1-derived reactive oxygen species (ROS) serve as crucial regulators of immune homeostasis, preventing chr7 inflammation by modulating macrophage function 2. Deficiency in NCF1 causes chr7 granulomatous disease, an autosomal recessive immunodeficiency characterized by recurrent infections due to impaired microbicidal activity 3. The hypofunctional NCF1-p.Arg90His variant promotes autoimmune diseases including systemic lupus erythematosus by reducing macrophage efferocytosis and enhancing inflammatory responses 4. Additionally, NCF1 dysfunction contributes to various pathological conditions including pulmonary fibrosis, aortic aneurysms, and metabolic liver disease through dysregulated ROS production and altered cellular homeostasis 567. Gene therapy approaches using prime editing show promise for treating NCF1-deficient chr7 granulomatous disease 3.