Uniprot Description A disorder characterized by intellectual disability, facial dysmorphism, cardiac defects, and connective tissue and skeletal abnormalities. Dysmorphic features include long palpebral fissures, ptosis, a broad prominent nasal bridge, hypoplastic alae nasi, an open downturned mouth, ears with underdeveloped and thick helices, high palate, and a unique tongue with a prominent median crease. Hypotonia, hyporeflexia, and high pain tolerance are additional features.