Kabuki Syndrome

Overview

Kabuki syndrome is a rare genetic condition that a person is born with. It can affect how the body grows and develops, and it often involves the face, the brain, the heart, the kidneys, and the muscles and bones. The name comes from facial features that some doctors in the past thought looked like the makeup worn by actors in Japanese Kabuki theatre. Many families find the name old-fashioned or unhelpful. What matters most is that every person with Kabuki syndrome is an individual, with their own strengths, needs and personality.

It is rare. Reliable estimates are hard to pin down, but it is thought to affect roughly 1 in 30,000 to 1 in 40,000 babies. Because the features vary so much from person to person, some people are probably never diagnosed.

Kabuki syndrome affects boys and girls and people of every ethnic background. It is present from birth and stays part of a person's life. Some features are more common or more noticeable in one sex than another, depending on which gene is involved.

Symptoms

Common symptoms

• Distinctive facial features — for example long eyelashes, arched and often sparse eyebrows, the outer corners of the lower eyelids turning down, prominent ears, a broad or flattened nose tip, and a small lower jaw
• Floppy or low muscle tone (hypotonia) in babies, which can make them feel 'floppy' to hold and can slow early movement
• Feeding difficulties in infancy, including poor sucking, slow feeding, reflux and slow weight gain
• Growth delay — many children are shorter and lighter than other children of the same age
• Developmental delay, especially in speech and language, and mild to moderate learning disability in many children
• Hearing loss, which may be temporary (often from glue ear) or permanent
• Eye and vision problems such as long- or short-sightedness, a squint, or drooping eyelids
• Cleft lip and/or cleft palate, or a high-arched palate
• Loose, flexible joints and a curved spine (scoliosis or kyphosis) that can develop with age
• Heart problems present from birth in some children
• Kidney or urinary tract differences present from birth in some children
• Seizures (fits) in some people
• More frequent infections, particularly ear infections and chest infections
• Dental problems, such as missing or extra teeth or teeth coming through in an unusual position
• Early puberty in some children
• Underactive thyroid or growth hormone differences in some people

Symptoms in children

• Slow feeding and poor weight gain in the first year are often the earliest signs
• Delayed sitting, crawling, walking and, especially, delayed talking
• Frequent ear infections, and hearing tests are usually needed early
• Clingy or anxious behaviour, and difficulty with changes in routine
• Sleep problems, constipation and reflux are common in early childhood
• Some children are very sociable and affectionate; others find social situations harder

Symptoms in older adults

• Adults with Kabuki syndrome are a small and less well-studied group, so knowledge is still growing
• Learning disability and support needs vary widely — many adults live active lives, some with supported work or supported living
• Hearing and vision problems can worsen with age and need regular checking
• Joint pain, joint looseness and spinal curvature can cause discomfort in adulthood
• Some adults are at higher risk of anxiety, low mood and social isolation
• Weight gain and reduced fitness can become an issue, especially where movement is limited
• Long-term follow-up with a doctor who knows the condition is strongly recommended

Causes

Main causes

• Kabuki syndrome is caused by a change (variant) in a gene that plays a role in how the body develops before birth. The most commonly affected gene is KMT2D; a smaller number of people have a change in KDM6A.
• These gene changes affect substances called histones, which help switch other genes on and off. When this control is altered during development, it can affect many parts of the body at once — which is why Kabuki syndrome involves several body systems.
• In most people the gene change is new in that child (doctors call this 'de novo') and was not present in either parent. In a smaller number of families the change is inherited, which is why genetic counselling is offered.

Risk factors

• Most cases happen by chance, and nothing the parents did or did not do causes the condition
• Having a parent with the same gene change — a genetics team can explain the chance of passing it on, which differs depending on which gene is involved
• There are no proven lifestyle, diet or environmental risk factors that parents can control
• Age of the parents has been studied for many rare genetic conditions, but it is not a reliable predictor here and is not something to blame yourself for

When to see a doctor

See a doctor urgently if:

• A baby who is feeding poorly, not putting on weight, or seems floppy and unusually sleepy
• Fever in a very young baby, or any fever in a child with a known heart or immune problem
• A seizure, or a sudden change in awareness or behaviour
• Breathing that is fast, noisy or laboured, or lips looking blue or grey — call your local emergency number if this is severe
• A new curve in the spine, or back pain that is stopping normal activity
• Sudden hearing loss, sudden vision change, or severe ear pain

Book a routine appointment if:

• You or your child have features that suggest a genetic condition and no explanation has been found — ask your doctor about a referral to clinical genetics
• Your child is not meeting expected milestones in movement, speech or learning
• You are finding it hard to manage feeding, sleep, behaviour, constipation or anxiety
• You need a school, nursery or workplace support plan put in place
• You want to talk about family planning, and there is a known gene change in the family
• An adult with Kabuki syndrome needs a review of hearing, vision, heart, spine or mental health

Diagnosis

Doctors suspect Kabuki syndrome from a combination of the physical features, growth pattern, development and health history. The diagnosis is usually confirmed with a genetic test that looks for a change in the KMT2D or KDM6A gene. Because the features overlap with other rare conditions, a genetics specialist is normally involved, and the whole process can take several months.

Tests that may be done

• A full physical examination, including measurements of height, weight and head size, and looking at the face, hands, spine and joints
• Developmental and learning assessment, often with a paediatrician or child development team
• Genetic testing — usually a gene panel or a broader test that reads many genes at once, looking for changes in KMT2D and KDM6A
• Genetic testing of parents in some cases, to see whether the change was inherited
• Ultrasound scan of the heart (echocardiogram) to check for heart differences
• Ultrasound scan of the kidneys and urinary system
• Hearing tests, including newborn hearing screening and later tests such as tympanometry for glue ear
• Eye and vision checks
• Blood tests to check thyroid function, hormone levels and general health
• Brain imaging (such as MRI) if there are seizures or unusual neurological signs
• Sleep study if there is snoring, pauses in breathing, or very disrupted sleep
• Dental review, and X-rays of the spine if a curve is suspected

What to expect at your appointment

Waiting for genetic results can feel long and stressful. You will usually be offered an appointment to talk through the results, what they mean, and what happens next. A diagnosis often opens the door to the right specialists, therapy and support — many families say that although the news was hard, having a name for what is happening helped them get organised. Ask for the information in writing, and ask who to contact with questions afterwards.

Treatment

There is no cure for Kabuki syndrome and no single treatment that works for everyone. Instead, care is put together around the individual — a team of professionals from different areas (often called a multidisciplinary team) checking the things that can be affected and stepping in early. The aim is to support growth, development, communication, learning, comfort and independence, and to catch problems such as hearing loss, a curved spine or a heart issue before they cause harm.

Self-care at home

• Keep a simple health record — appointments, test results, hearing and vision checks, and anything you have noticed — and bring it to every visit
• Ask for a written care plan and a named person to contact, so you are not starting from scratch each time
• Build routines around meals, sleep and transitions; predictable routines help many children feel calmer
• Use visual timetables, key-word signing or other communication aids if speech is delayed
• Keep up with dental care, and ask about fluoride advice and mouth care routines
• Watch for constipation and reflux, and raise them early — they are common and treatable
• Encourage movement and play in ways your child enjoys, adapted to their energy and joint needs
• Ask your pharmacist or doctor to review any medicines or supplements, including over-the-counter ones

Medical treatments

Care is built around what each person needs. Common approaches include feeding support and dietitian input for babies who struggle to feed; speech and language therapy; physiotherapy for muscle tone, movement and joints; occupational therapy for everyday skills, sensory needs and handwriting; and educational support in nursery or school. Regular checks of hearing, vision, heart, kidneys, spine, thyroid and growth are usually recommended, with specialist input as needed. Medicines may be used for particular problems such as seizures, infections, reflux, constipation, thyroid hormone replacement or early puberty — your doctor will discuss the options, benefits and side effects with you, and this guide deliberately does not name specific medicines or doses. Psychological and behavioural support can help with anxiety, sleep and behaviour.

When is surgery considered?

Surgery is only considered for specific problems, and never as a treatment for the syndrome itself. It may be offered for a cleft lip or palate, certain heart defects, a spinal curve that is getting worse, persistently troublesome glue ear (where small tubes may be placed), or dental problems. Your specialist team will explain the risks, benefits and timing, and decisions are always made together with you.

Living with this condition

Life with Kabuki syndrome is busy but manageable with the right structures. Expect a number of appointments in the early years, then a steadier pattern as checks become routine. Planning ahead for school, appointments and travel helps. Many families find it useful to keep one folder or phone note holding letters, reports and contact details, and to nominate one adult as the main point of contact with services.

Lifestyle tips

• Keep routines for meals, sleep and getting ready — predictability reduces stress for many children
• Ask the school or nursery for an individual support plan and regular review meetings
• Use hearing aids, glasses or communication aids consistently if they are recommended
• Encourage friendships and hobbies — clubs, swimming, music or art can build confidence
• Build in rest; some children tire more easily or need recovery time after busy days
• Make time for siblings, who often carry worries quietly
• As an adult, ask your doctor for a summary of your condition to share with any new health professional

Diet and exercise

There is no special diet for Kabuki syndrome. If feeding or growth is a concern, a dietitian can help with texture, calorie boost and routines. Treat constipation with plenty of fluids, fibre and movement, and ask for advice if it persists. Movement matters at every age — choose activities that suit the person's joints, tone and energy, such as swimming, walking, cycling or adapted sport. If joint looseness or a spinal curve is present, a physiotherapist can suggest safe exercises. Gentle weight management support may be helpful in later childhood and adulthood if movement is limited.

Mental health and emotional wellbeing

Living with a rare condition — as the person affected, a parent, or a sibling — can bring worry, grief, exhaustion and loneliness, and those feelings are completely understandable. Children and adults with Kabuki syndrome may also experience anxiety, low mood, frustration at being misunderstood, or difficulties with social situations. These are health needs in their own right and deserve proper support, not just patience. Talking therapies, school or workplace adjustments and family counselling can all help. If you or someone you care for is having thoughts of harming themselves, contact your local emergency number or a crisis line in your country straight away, and tell a healthcare professional you trust.

Prevention

Kabuki syndrome cannot be prevented. It is caused by a gene change that happens before birth, and nothing a parent did or did not do during pregnancy causes it. If a gene change has already been found in your family, a genetics service can explain the chance of it happening again in a future pregnancy and what options are available, including testing in pregnancy. That is a personal decision, and the genetics team will talk it through with you without pressure.

Vaccines

Children with Kabuki syndrome should have the routine childhood immunisations for their country unless a doctor advises otherwise. Some children with heart or immune problems may be advised to have extra protection, such as additional vaccines or other preventive treatment — your doctor or specialist team will advise on what is right for the individual. Annual flu vaccination is often recommended for the person and close family members.

Screening programmes

Once a diagnosis is made, regular monitoring replaces general screening: hearing and vision checks, heart and kidney checks at diagnosis, thyroid and growth monitoring, blood pressure, spinal checks during growth spurts, and dental reviews. Adults should continue with hearing, vision, heart, spinal and mental health reviews through a doctor who knows the condition.

Complications

If left untreated

• Poor growth and nutrition if feeding difficulties are not supported
• Speech and language delay that is worse than it needs to be if hearing loss is not picked up early
• Learning and behaviour difficulties that go unsupported at school
• Heart problems that go unnoticed and become harder to treat
• Kidney or urinary problems that cause repeated infections or long-term damage
• A spinal curve that progresses if it is not monitored
• Ongoing ear infections affecting hearing and speech
• Anxiety, low mood and social isolation when support is not in place
• Weight gain and reduced fitness in later life when movement is limited

Long-term outlook

People with Kabuki syndrome have very different journeys. Many live full, sociable lives — going to school, working, volunteering, having relationships and hobbies — with support that is tailored to them. Some need lifelong help with daily living, and others need very little. Early therapy, regular health checks and good support at home and school tend to make the biggest difference. Knowledge about the condition is still growing, and services are better than they have ever been, so it is reasonable to feel hopeful while planning for the needs that actually appear.

Find support

External links open third-party websites. Ruqelo Health is not responsible for external content. Listing an organisation does not imply endorsement.