Autism spectrum disorder due to AUTS2 deficiency is a rare genetic syndromic intellectual disability characterized by global developmental delay and borderline to severe intellectual disability, autism spectrum disorder with obsessive behavior, stereotypies, hyperactivity but frequently friendly and affable personality, feeding difficulties, short stature, muscular hypotonia, microcephaly, characteristic dysmorphic features (hypertelorism, high arched eyebrows, ptosis, deep and/or broad nasal bridge, broad/prominent nasal tip, short and/or upturned philtrum, narrow mouth, and micrognathia), and skeletal anomalies (kyphosis and/or scoliosis, arthrogryposis, slender habitus and extremities). Other clinical features may include hernias, congenital heart defects, cryptorchidism and seizures. The disease is Monarch Disease Ontology term MONDO_0014361 (autism spectrum disorder due to AUTS2 deficiency). Also known as: ASD due to AUTS2 deficiency, AUTS2 syndrome, MRD26, autosomal dominant mental retardation 26, autosomal dominant non-syndromic intellectual disability 26, intellectual developmental disorder, autosomal dominant 26, intellectual disability type 26, mental retardation, autosomal dominant 26.