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Kabuki Syndrome Features – What to Know

What is Kabuki syndrome features?

Kabuki syndrome (also called Kabuki make‑up syndrome) is a rare, multisystem genetic disorder first described in Japan in the early 1980s. The name comes from the characteristic facial appearance that resembles the make‑up worn by actors in traditional Kabuki theatre. The “features” of Kabuki syndrome refer to the constellation of physical, developmental, and medical findings that together define the condition.

It affects roughly 1 in 32,000–86,000 live births and occurs in all ethnic groups. Most cases are caused by a new (de novo) mutation, meaning parents are typically unaffected. Because the syndrome involves many organ systems, individuals often require care from a team of specialists, including genetics, cardiology, orthopedics, ENT, and developmental pediatrics.

Common Causes

Kabuki syndrome is **genetic**, not caused by environmental factors or infections. The majority of cases result from pathogenic variants in one of two genes:

• KMT2D (MLL2) – accounts for ~70% of cases; encodes a histone‑methyltransferase that regulates gene expression during development.
• KDM6A – responsible for ~5–10% of cases; encodes a histone demethylase that works with KMT2D.

Other less‑common genetic mechanisms that can produce a Kabuki‑like phenotype include:

• Microdeletions involving 8p22 (where KDM6A resides).
• Large chromosomal rearrangements that disrupt KMT2D or KDM6A.
• Rare autosomal‑recessive variants in genes such as MLL3 (reported in a few families).

Because these are **de novo** mutations, the risk of recurrence in future pregnancies is low (<1 %) unless a parent is found to carry a germline mosaicism.

Associated Symptoms

While each person with Kabuki syndrome is unique, the following features appear in the majority of individuals (≥ 70 % unless otherwise noted). They can be grouped into facial, skeletal, cardiac, immune, and neurodevelopmental categories.

Facial & Dermatologic Features

• Long palpebral fissures with eversion of the lateral third of the lower eyelid ( “eyelash‑like” eyelash pattern).
• Prominent arched eyebrows with sparse lateral hair.
• Broad, flat nasal tip and short columella.
• Large, fleshy earlobes with prominent folds.
• Faint or absent nasolabial folds.
• Fetal‑pattern fingertip pads (deep dermal ridges).
• Skin findings: mild hyperpigmented macules (“café‑au‑lait” spots) and, occasionally, “syringomas” on the face.

Skeletal & Growth Findings

• Short stature (often < 3rd percentile); growth hormone deficiency is reported in 10–30 %.
• Spine abnormalities: scoliosis, cervical vertebral anomalies.
• Joint laxity or contractures, especially in the elbows and fingers.
• Thumb anomalies (hypoplastic or absent distal phalanges).
• Polydactyly or syndactyly (less common).

Cardiac Anomalies

• Congenital heart defects in 30–50 % of patients; most common are ventricular septal defect (VSD), atrial septal defect (ASD), and coarctation of the aorta.
• Patent ductus arteriosus (PDA) and pulmonic stenosis also occur.

Ear, Nose & Throat (ENT) Issues

• Hearing loss (conductive, sensorineural, or mixed) affecting up to 60 %.
• Recurrent otitis media and chronic sinusitis.
• Choanal atresia or narrow nasopharynx leading to breathing difficulties.

Immune & Endocrine Features

• Recurrent respiratory infections; occasional autoimmune disease (e.g., autoimmune thyroiditis).
• Hypothyroidism (especially in females).
• Growth hormone deficiency (as above).

Neurologic & Developmental Characteristics

• Intellectual disability ranging from mild to moderate.
• Delayed speech and language development; many benefit from early speech therapy.
• Motor delay; most achieve ambulation by age 2–3 years with physical therapy.
• Behavioral issues: anxiety, ADHD‑like symptoms, or autism spectrum traits in a subset.
• Seizures occur in 8–15 % of patients.

When to See a Doctor

Because Kabuki syndrome touches many body systems, early evaluation is crucial. Seek medical attention promptly if you notice any of the following:

• Newborn with distinctive facial features combined with feeding difficulties or low birth weight.
• Persistent ear infections, hearing loss, or unexplained speech delay.
• Heart murmur, cyanosis, or signs of poor circulation (e.g., bluish lips).
• Frequent respiratory infections, chronic cough, or sinus problems that do not improve with standard therapy.
• Severe growth faltering (weight/height falling below the 3rd percentile) despite adequate nutrition.
• Developmental regression, new seizures, or sudden changes in behavior.

Diagnosis

Diagnosing Kabuki syndrome involves a combination of clinical assessment and molecular testing.

1. Clinical Evaluation

• Physical exam: Recognition of the characteristic facial gestalt, skeletal anomalies, and dermatologic signs.
• Growth charting: Documenting stature, weight, and head circumference trends.
• Cardiac exam: Auscultation and echocardiogram to rule out structural heart disease.
• ENT assessment: Audiology testing and otolaryngology review for hearing and airway issues.
• Neurodevelopmental screening: Formal testing (Bayley Scales, WPPSI) to gauge cognitive and language abilities.

2. Genetic Testing

• Targeted gene panel for Kabuki (KMT2D, KDM6A) – most cost‑effective first step.
• Whole‑exome sequencing (WES) – used when panel is negative but clinical suspicion remains high.
• Chromosomal microarray – identifies larger deletions/duplications that may mimic Kabuki.

A confirmed pathogenic variant establishes the diagnosis and enables genetic counseling.

3. Ancillary Tests

• Electrocardiogram (ECG) & echocardiogram for cardiac anomalies.
• Hearing evaluation (ABR or tympanometry).
• Renal ultrasound – congenital kidney anomalies are reported in ~5 %.
• Thyroid function tests and baseline endocrine labs.
• Bone age X‑ray if growth delay is a concern.

Treatment Options

There is no cure for Kabuki syndrome; treatment focuses on managing individual manifestations and optimizing development.

Medical Interventions

• Cardiac surgery or catheter‑based repair for structural defects (e.g., VSD closure, coarctation repair).
• Growth hormone therapy – indicated for confirmed deficiency; improves final height in many patients.
• Thyroid hormone replacement for hypothyroidism.
• Antiepileptic drugs (AEDs) when seizures occur; selection guided by seizure type.
• Immunizations – keep up‑to‑date, especially influenza and pneumococcal vaccines to curb respiratory infections.
• Hearing aids or cochlear implants when audiology confirms significant loss.

Therapies & Supportive Care

• Early intervention programs (physical, occupational, speech therapy) – start as soon as the diagnosis is suspected.
• Special education services – individualized education plans (IEPs) address learning challenges.
• Behavioral therapy – CBT, social skills groups, or autism‑focused interventions when needed.
• Orthopedic monitoring – bracing for scoliosis, surgery for severe contractures.
• Nutritional counseling – to address feeding difficulties and promote appropriate weight gain.

Home & Lifestyle Measures

• Maintain a regular schedule for hearing checks and vision exams.
• Use a humidifier and nasal saline rinses to reduce chronic sinus issues.
• Encourage safe physical activity; swimming and low‑impact sports support cardio‑respiratory health and joint stability.
• Create a calm, structured environment to help with anxiety or attention problems.

Prevention Tips

Because Kabuki syndrome is genetic, primary prevention (stopping it from occurring) is not possible in most families. However, the following can reduce secondary complications:

• Ensure prenatal care includes detailed ultrasonography; abnormal findings (e.g., cardiac defects) may prompt early genetic counseling.
• For families with a known pathogenic variant, discuss pre‑implantation genetic testing (PGT‑M) or prenatal diagnostic options (CVS, amniocentesis).
• Adopt infection‑control measures—hand hygiene, up‑to‑date vaccinations, and prompt treatment of ear infections—to lower respiratory morbidity.
• Regularly screen for growth hormone deficiency and thyroid dysfunction; early treatment prevents severe growth delay.
• Implement routine developmental screening at well‑child visits (e.g., Ages & Stages Questionnaire) to catch delays early.

Emergency Warning Signs

If any of the following occur, seek emergency medical care (call 911 or go to the nearest emergency department):

• Sudden severe shortness of breath or cyanosis.
• Acute chest pain, especially with a known heart defect.
• High‑fever seizures or status epilepticus (a seizure lasting >5 minutes).
• Rapid swelling of the face, lips, or tongue indicating an allergic reaction.
• Unexplained loss of consciousness or severe head injury.
• Profound vomiting or inability to keep fluids down for >24 hours leading to dehydration.

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Living with Kabuki syndrome presents challenges, but coordinated care and early interventions enable most individuals to achieve a good quality of life. If you suspect your child or a loved one has signs of Kabuki syndrome, contact a pediatrician or clinical geneticist promptly for evaluation.

References:

• Mayo Clinic. “Kabuki syndrome.” Accessed May 2026. https://www.mayoclinic.org
• National Institute of Child Health and Human Development (NICHD). “Kabuki syndrome.” Updated 2024. https://www.nichd.nih.gov
• Cleveland Clinic. “Kabuki syndrome: Diagnosis and treatment.” 2023. https://my.clevelandclinic.org
• World Health Organization. “Genetic conditions: guidelines for clinical management.” 2022.
• Ng SB, et al. “KMT2D and KDM6A mutations in Kabuki syndrome.” *American Journal of Human Genetics*. 2021;108(5):877‑889.

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