Systemic lupus erythematosus-17 (SLEB17) is an X-linked dominant autoimmune disorder characterized by onset of systemic autoinflammatory symptoms in the first decades of life. Only affected females have been reported. Features may include classic features of SLE, such as malar rash and arthralgias, or can include less common entities such as hemiplegia and neuromyelitis optica (NMO). Laboratory studies show the presence of autoantibodies and enhanced NFKB (164011) signaling, the latter being consistent with a gain-of-function effect (Brown et al., 2022). For a phenotypic description and a discussion of genetic heterogeneity of systemic lupus erythematosus (SLE), see 152700.