Mbd5 Haploinsufficiency, also known as 2q23.1 microdeletion syndrome, is related to microcephaly and intellectual developmental disorder, autosomal dominant 1. An important gene associated with Mbd5 Haploinsufficiency is MBD5 (Methyl-CpG Binding Domain Protein 5). Affiliated tissues include heart and eye, and related phenotypes are seizure and global developmental delay