Angelman Syndrome is a rare genetic disorder that affects the nervous system and is characterized by developmental delays, seizures, and problems with balance and coordination. It is usually caused by a mutation in the UBE3A gene, which is located on chromosome 15. Affected individuals typically have difficulty speaking, walking, and/or understanding language. Other common features include happy and giggly behavior, sleep disturbances, and an abnormal gait. Treatment is aimed at managing the symptoms, and may include physical, occupational, and speech therapy.