Paeds · genetics-dysmorphology-and-metabolism
Williams syndrome
Also known as Williams-Beuren syndrome · Williams-Beuren syndrome (WBS) · 7q11.23 microdeletion syndrome · Idiopathic infantile hypercalcaemia with supravalvular aortic stenosis (historical) · WBS
A fellowship approach to Williams syndrome: recognise the multisystem pattern of a 7q11.23 microdeletion (distinctive facies, supravalvular aortic stenosis and elastin arteriopathy, infantile hypercalcaemia, the hypersocial personality and Williams cognitive profile), confirm the deletion with chromosomal microarray, stage the cardiovascular disease as the leading cause of mortality, and run an age-based multidisciplinary surveillance plan anchored to the AAP 2020 health-supervision clinical report.
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Target exams
Red flags
- A dysmorphic infant with a heart murmur, failure to thrive, and irritability or constipation — suspect Williams syndrome with supravalvular aortic stenosis and infantile hypercalcaemia; check four-limb blood pressure and serum calcium, and arrange echocardiography
- Chest pain, syncope, exercise intolerance, or collapse in a child with Williams syndrome — possible coronary artery ischaemia or critical outflow obstruction; treat as a cardiac emergency, urgent ECG and cardiology
- Severe symptomatic hypercalcaemia in an infant — dehydration, vomiting, polyuria, and irritability; admit, hydrate, and restrict calcium and vitamin D
- Any planned sedation, general anaesthesia, or procedural stimulation in a child with Williams syndrome — sudden cardiac death under anaesthesia is a recognised risk; mandate dedicated cardiac and coronary assessment first
- Hypertension in a child with Williams syndrome — the elastin arteriopathy involves renal arteries and the aorta; investigate renovascular cause and reduce blood pressure in a controlled fashion
- A sociable, fluent, verbal child whose daily-living and visuospatial skills are far behind the speech — the cocktail-party loquacity masks significant intellectual disability
- An affected parent — the deletion is autosomal dominant, so each child has a 50 percent recurrence risk; cascade-test and counsel
Life stages
Care settings
Clinical exam formats
Board mappings
- Microdeletion syndromes and the dysmorphic child
- Recognition of Williams syndrome
- Genetic counselling of an autosomal dominant microdeletion
- The 7q11.23 contiguous-gene deletion and candidate genes
- Cardiovascular surveillance and the elastin arteriopathy
- Management of infantile hypercalcaemia
- Recognising and investigating Williams syndrome
- Four-limb blood pressure and the cardiac assessment
- Coordinating multidisciplinary developmental support
- Long case of a child with distinctive facies, a murmur, and developmental delay
- Discussing anaesthetic and cardiac risk and recurrence counselling with the family
- Genetic causes of neurodevelopmental disorder
- Cardiovascular assessment of the child with a syndrome
- Communication in complex chronic disability
- 7q11.23 microdeletion genetics and candidate genes
- The Williams syndrome cognitive profile
- Cardiovascular and metabolic complications of Williams syndrome
- Developmental assessment of the child with a syndrome
- Cardiovascular examination and four-limb blood pressure
- Williams syndrome genetics and management
- Microdeletion syndromes in the dysmorphic child
- Infantile hypercalcaemia
- Williams syndrome
- Evaluation of the dysmorphic child
- Genetic counselling and family testing
- Williams-Beuren syndrome
- Investigation of the dysmorphic child with cardiac disease
- Multidisciplinary care of genetic neurodevelopmental disability
The fellowship mark goes to the candidate who thinks in three layers at once. The first is the child's heart: the elastin arteriopathy is the leading cause of morbidity and mortality, and the coronary arteries are its most dangerous and most easily missed expression. The second is the gene dose: a microdeletion of about 1.5 to 1.8 megabases at 7q11.23 removes one copy of elastin and a cluster of neurodevelopmental genes, and the phenotype is the sum of those haploinsufficiencies. The third is the family and the function: an affected parent changes the recurrence risk from background to one in two, and a sociable, verbal child still needs real support because the speech conceals a genuine intellectual and daily-living disability. [2] [5]
Overview & Definition
Williams syndrome, also called Williams-Beuren syndrome, is a multisystem contiguous-gene microdeletion syndrome caused by the hemizygous deletion of approximately 1.5 to 1.8 megabases at chromosome 7q11.23, a region containing 26 to 28 genes. The deletion produces a recognisable constellation of distinctive facies, a cardiovascular arteriopathy dominated by supravalvular aortic stenosis, infantile hypercalcaemia, intellectual disability with a characteristic cognitive profile, and a hypersocial personality. It affects roughly one in 7,500 to one in 10,000 live births, with no racial or sex predilection. [1] [2]
Clinically, Williams syndrome is the paradigm of how the loss of a handful of dosage-sensitive genes produces a coherent multisystem phenotype. Haploinsufficiency of the elastin gene (ELN) accounts for the cardiovascular and connective-tissue features — the narrowed, thickened arteries, the herniae, joint laxity, soft skin. Loss of the neighbouring GTF2I, GTF2IRD1, and LIMK1 genes accounts for the intellectual disability, craniofacial gestalt, hypersocial personality, and the visuospatial construction deficit. The syndrome is therefore best taught and best examined as the sum of its haploinsufficiencies, not as a single disease. [2] [5]
Historically, the syndrome was assembled from two separate descriptions: in 1961, the New Zealand cardiologist J. C. P. Williams reported supravalvular aortic stenosis with a distinctive facies and intellectual disability, and in the same year the German physicians A. J. Beuren and colleagues described a similar constellation. The historical name idiopathic infantile hypercalcaemia with supravalvular aortic stenosis captures the two features that first brought the syndrome to clinical attention, and the obsolete lay term elfin facies is now avoided because it is considered pejorative; use distinctive or characteristic facies. [8]
References8ShowHide
- [1]Morris CA, Braddock SR Health Care Supervision for Children With Williams Syndrome. Pediatrics, 2020.PMID 31964759
- [2]Kozel BA, Barak B, Kim J, et al. Williams syndrome. Nat Rev Dis Primers, 2021.PMID 34140529
- [3]Collins RT 2nd. Cardiovascular disease in Williams syndrome. Curr Opin Pediatr, 2018.PMID 30045083
- [4]Collins RT 2nd, Gravenhorst V, Faury G, et al. Clinical Care for Cardiovascular Disease in Patients With Williams-Beuren Syndrome. J Am Heart Assoc, 2024.PMID 39291481
- [5]Merla G, Brunetti-Pierri N, Piccolo P, et al. Supravalvular aortic stenosis: elastin arteriopathy. Circ Cardiovasc Genet, 2012.PMID 23250899
- [6]Sindhar S, Lugo M, Levin MD, et al. Hypercalcemia in Patients with Williams-Beuren Syndrome. J Pediatr, 2016.PMID 27574996
- [7]Twite MD, Stenquist S, Ing RJ Williams syndrome. Paediatr Anaesth, 2019.PMID 30811742
- [8]Committee on Genetics. American Academy of Pediatrics: Health care supervision for children with Williams syndrome. Pediatrics, 2001.PMID 11331709