Any autosomal dominant non-syndromic intellectual disability in which the cause of the disease is a mutation in the SYNGAP1 gene. The disease is Monarch Disease Ontology entry MONDO_0012960 (intellectual disability, autosomal dominant 5). Also known as: MRD5, SYNGAP1 autosomal dominant non-syndromic intellectual disability, SYNGAP1-related developmental and epileptic encephalopathy, autosomal dominant intellectual disability 5, autosomal dominant mental retardation 5, autosomal dominant non-syndromic intellectual disability caused by mutation in SYNGAP1, epilepsy due to SYNGAP mutations, intellectual disability, autosomal dominant type 5.