Williams syndrome

Williams syndrome (also known as Williams-Beuren syndrome) is a rare genetic disorder caused by a microdeletion of approximately 26-28 genes on chromosome 7q11.23, including the ELN (elastin) gene. This contiguous gene deletion occurs de novo in most cases and affects multiple body systems, producing a distinctive pattern of physical, cognitive, and behavioral features. The condition is typically recognizable in infancy or early childhood through a characteristic facial appearance often described as 'elfin-like,' featuring a broad forehead, short nose with a broad tip, full cheeks, wide mouth with full lips, and a small chin. The cardiovascular system is significantly affected, with supravalvular aortic stenosis (SVAS) being the hallmark cardiac finding, occurring in approximately 75% of individuals. Other vascular stenoses, including peripheral pulmonary artery stenosis and renal artery stenosis, may also occur and can lead to systemic hypertension. Hypercalcemia is common in infancy and may cause irritability and feeding difficulties. Individuals typically have mild to moderate intellectual disability, with a distinctive cognitive profile characterized by relative strengths in verbal abilities and social engagement, contrasted with significant weaknesses in visuospatial construction. A hallmark behavioral feature is an overly friendly, gregarious personality with a lack of social inhibition, often accompanied by anxiety and attention difficulties. Connective tissue abnormalities related to elastin deficiency can affect the skin, joints (hypermobility), and other organs. Endocrine issues including hypothyroidism and early puberty may occur. There is no cure for Williams syndrome, and management is multidisciplinary. Treatment focuses on regular cardiovascular monitoring and surgical intervention for significant stenoses, management of hypercalcemia through dietary modification, monitoring of blood pressure and renal function, and addressing endocrine abnormalities. Early intervention programs, speech therapy, occupational therapy, and specialized educational support are essential for optimizing developmental outcomes. Regular ophthalmologic and audiologic evaluations are also recommended. With appropriate medical surveillance and supportive care, many individuals with Williams syndrome can lead fulfilling lives, though most require some level of support throughout adulthood.

Data sourced from FDA regulatory filings and ClinicalTrials.gov. Updated periodically.

Common questions about Williams syndrome