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Angelman Syndrome information card
🧬 Genetic Condition

Angelman Syndrome

A rare genetic condition affecting development, communication, and movement. Characterised by a happy, sociable personality and love of water.

🧸 Early Years 🏫 School Age 🧑 Teens & Adults ♾️ Lifelong

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📖 Overview

Angelman Syndrome is a rare neurogenetic condition caused by loss of function of the UBE3A gene on chromosome 15, usually through a deletion on the maternal copy of the chromosome. It affects approximately 1 in 12,000-20,000 people.

Angelman Syndrome causes significant intellectual disability, little or no speech, movement and balance difficulties, seizures, and a characteristic behavioural phenotype that includes a happy, excitable, sociable personality, frequent smiling and laughter, attraction to water, and short attention span.

People with Angelman Syndrome typically do not develop meaningful spoken language. Communication relies on augmentative and alternative communication (AAC) — including high-tech speech devices, Proloquo2Go, PECS, and signing. With appropriate AAC support and high expectations, people with Angelman Syndrome can communicate effectively.

Seizures occur in approximately 80-90% of people with Angelman Syndrome, usually beginning in the first two years of life. Seizures are often difficult to control and may require multiple medications. EEG patterns in Angelman Syndrome are distinctive.

Sleep difficulties are very common — many people with Angelman Syndrome need only 4-6 hours of sleep and are active during the night. This significantly impacts families and carers.

The happy, sociable presentation of Angelman Syndrome can mask significant needs and lead to underestimation of support requirements. The person may appear content when in pain or distress because their natural affective state is positive.

🔍 Key Characteristics

Severe developmental delay from birth
Little or no speech development
Happy demeanour frequent smiling laughter
Epilepsy 85-90 percent have seizures
Movement balance problems ataxia
Sleep disturbances
Hand-flapping and excitability
Love of water play and music

🌅 What Day to Day Life Can Look Like

Communication is through AAC — speech devices, PECS, signing, gesture
Sleep is often minimal — 4-6 hours is common, with significant night waking
Seizures are part of daily life for most — medication management and seizure awareness are constant
Attraction to water is strong — safety around water requires constant vigilance
Hypermobility and an ataxic gait make movement effortful and falls common
Short attention span means activities need to be engaging and varied
Sensory sensitivities — particularly to heat — are common
A love of music, bright colours, and social interaction are positive features to build on
The happy presentation can mask pain, illness, or distress — behavioural change is how discomfort is communicated
Families carry a significant support burden — the care needs are lifelong and high

❌ What People Often Get Wrong

A happy person does not mean a person without significant needs
No speech does not mean no communication — AAC enables meaningful expression
Angelman Syndrome is not autism, though autism features can co-occur
The happy presentation means pain and illness can be missed — behavioural change must be taken seriously
Seizure control in Angelman Syndrome is often difficult — multiple medications and specialist neurology support are needed
Water safety must be an absolute priority — the attraction to water and the inability to manage risk is a constant safety concern
People with Angelman Syndrome can and do form strong, meaningful relationships
AAC should be introduced early and consistently — the window for communication development is important
Carers and families need substantial practical and emotional support — the care burden is immense
People with Angelman Syndrome have individual personalities, preferences, and lives beyond their diagnosis

✅ What Helps

AAC devices signing picture systems
Physiotherapy for movement
Anti-epileptic medication management
Sleep hygiene strategies
Safe environments for mobility challenges
Sensory activities music water play
Do not assume understanding based on speech absence
Regular neurology follow-ups
Orthopaedic monitoring
Family support and respite
Informational only. Consult professionals for individualised support.

🏫 School & Education Support

Total communication environment — AAC at the centre of all interactions
High-tech AAC device trained on by all staff working with the child
Seizure management plan and trained staff
Water safety protocol for any swimming or water activity
Physiotherapy for movement and balance
OT for daily living skills
Highly visual, sensory, and music-based learning activities
Small group or one-to-one teaching
Sleep diary shared between home and school to contextualise functioning
EHCP with specialist input and high level of support specified

⚠️ Safety & Red Flags

Water safety — drowning risk is serious and must be planned for at all times
Prolonged or clustering seizures — medical emergency
Unexplained change in behaviour that may indicate pain or illness the person cannot communicate
Scoliosis developing — common in Angelman Syndrome and needs orthopaedic monitoring
Significant regression — may indicate worsening seizure activity
AAC device not working or not available — communication access is a right and a safety issue
Carer breakdown — the care needs are intense and family support is essential to prevent crisis
Safeguarding concerns — non-speaking people with significant needs are at higher risk
Weight or nutritional concerns if feeding difficulties develop
Any placement that cannot provide the specialist level of support required

🔗 Related Conditions

Epilepsy Intellectual Disability (ID)

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