Acute febrile neutrophilic dermatosis (AFND) is an autosomal dominant autoinflammatory disorder characterized by onset of recurrent fever and dermatologic abnormalities in childhood. Laboratory studies show elevated acute-phase reactants and activation of the inflammatory response, particularly IL1B (147720). Additional more variable features may include myalgia and arthralgia (summary by Masters et al., 2016).

Periodic fever, immunodeficiency, and thrombocytopenia syndrome (PFITS) is an autosomal recessive immunologic disorder with variable manifestations. Common features include early-onset recurrent respiratory infections, stomatitis, and cutaneous infections. Organisms usually include bacteria such as pneumococcus, Staphylococcus, and H. influenzae, but severe viral infections, including varicella, may also occur. Laboratory investigations may show neutropenia, neutrophilia, leukocytosis, or lymphopenia, although levels of immune cells may also be normal. Detailed studies often show impaired neutrophil chemotaxis associated with increased or abnormal F-actin levels, and impaired, normal, or even increased oxidative burst, depending on the stimulus. B- and T-cell abnormalities have also been observed. Some patients develop autoimmune manifestations, including chronic thrombocytopenia, anemia, and periodic fevers, associated with activation of the inflammasome. Early death may occur; however, hematopoietic stem cell transplantation may be curative (summary by Kuhns et al., 2016, Standing et al., 2017, and Pfajfer et al., 2018).

A rare pleiotropic auto-inflammatory disorder of childhood, primarily affecting the joints and skin. The first affected family contained ten affected members from three generations and manifested variable expression of a pauciarticular, nonaxial, arthritis that began in childhood; pyoderma gangrenosum; and severe cystic acne in adolescence and beyond. Recurrent sterile arthritis usually occurs after minor trauma, but can also occur spontaneously. PAPA syndrome is a self-limiting disease, but it can lead to severe joint destruction. The gene responsible for the syndrome is the proline-serine-threonine phosphatase interacting protein 1 (PSTPIP1).

Common variable immunodeficiency-12 with autoimmunity (CVID12) is an autosomal dominant complex immunologic disorder with multisystem involvement. CVID12 is mainly a primary immunodeficiency characterized by recurrent infections and associated with hypogammaglobulinemia. Notably, about half of patients develop autoimmune features, including cytopenia, as well as generalized inflammation and lymphoproliferation manifest as lymphadenopathy or hepatosplenomegaly. A smaller percentage of affected individuals (less than 20%) develop cancer, most commonly solid tumors, including lymphoma. Age at onset and disease severity are highly variable, even within the same family. There is also incomplete penetrance, such that mutation carriers may be asymptomatic, even if they have hypogammaglobulinemia. The gene involved, NFKB1, encodes a transcription factor that regulates the expression of target genes involved in the immune system, thus defining the phenotype as a disorder of immune dysregulation (summary by Fliegauf et al., 2015; Lorenzini et al., 2020). For a general description and a discussion of genetic heterogeneity of common variable immunodeficiency, see CVID1 (607594).