Autoimmune polyendocrinopathy-candidiasis-ectodermal dystrophy (APECED)Immune dysregulation, polyendocrinopathy, enteropathy, X-linked (IPEX) syndromeLPS-responsive beige-like anchor protein (LRBA) deficiencyCytotoxic T lymphocyte antigen-4 (CTLA-4) haploinsufficiencyAutosomal dominant hyper-IgE syndrome (AD-HIES)IL-12/23 receptor beta 1 (IL-12/23Rβ1) and IL-12/23 cytokine p40 subunit deficiencyGlut1 deficiencyLeptin deficiencyWiskott-Aldrich syndrome (WAS)B cell activating factor (BAFF) receptor deficiencyGain-of-function mutations in PIK3CDX-linked agammaglobulinemia (XLA). The gene discussed is TNFSF13B; the disease is Bruton-type agammaglobulinemia.