Intellectual Developmental Disorder, Autosomal Dominant 2, also known as mrd2, is related to immunodeficiency 40 and ritscher-schinzel syndrome. An important gene associated with Intellectual Developmental Disorder, Autosomal Dominant 2 is MRD2 (Mental Retardation, Autosomal Dominant 2). Affiliated tissues include eye and thyroid, and related phenotypes are intellectual disability and global developmental delay