Uniprot Description An autosomal dominant syndrome characterized by atrial and/or ventricular septal congenital heart defects, facial dysmorphism with hypertelorism, upslanted palpebral fissures, epicanthal folds, ptosis, strabismus, posteriorly rotated ears, thin upper lip, and small mouth. Patients manifest global developmental delay, delayed walking and speech acquisition, and intellectual disability. Some patients have mild microcephaly, a small cerebral cortex, and agenesis of corpus callosum. More variable features include clinodactyly and/or camptodactyly of the fingers, hypotonia, and joint hypermobility.