Immunodeficiency 27a, also known as imd27a, is related to immunodeficiency 28 and immunodeficiency 27b. An important gene associated with Immunodeficiency 27a is IFNGR1 (Interferon Gamma Receptor 1), and among its related pathways/superpathways are Innate Immune System and Cytokine Signaling in Immune system. Affiliated tissues include lymph node and bone marrow, and related phenotypes are splenomegaly and fever