This gene encodes a RNA-editing deaminase that is a member of the cytidine deaminase family. The protein is involved in somatic hypermutation, gene conversion, and class-switch recombination of immunoglobulin genes. Defects in this gene are the cause of autosomal recessive hyper-IgM immunodeficiency syndrome type 2 (HIGM2).AICDA (Activation Induced Cytidine Deaminase) is a Protein Coding gene. Diseases associated with AICDA include Immunodeficiency With Hyper-Igm, Type 2 and Hyperimmunoglobulin Syndrome. Among its related pathways are IL4-mediated signaling events and NF-kappaB Signaling. GO annotations related to this gene include ubiquitin protein ligase binding and cytidine deaminase activity. An important paralog of this gene is APOBEC3G.