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Keratitis-ichthyosis-deafness syndrome
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Condition

Keratitis-ichthyosis-deafness syndrome

Keratitis-ichthyosis-deafness (KID) syndrome is a rare genetic disorder characterized by a triad of eye inflammation, skin abnormalities, and hearing loss.

Overview

KID syndrome involves three primary areas of health: the eyes, the skin, and the ears.

  • Eye Problems: Affected individuals usually have keratitis, an inflammation of the cornea. This can cause pain, light sensitivity (photophobia), abnormal blood vessel growth, and scarring, potentially leading to blindness.
  • Skin Abnormalities: Symptoms include thick, hard skin on the palms and soles (palmoplantar keratoderma) and dry, scaly, reddened patches (ichthyosis) on the body. These skin breaks can lead to infections, which may be life-threatening in infancy. There is also an increased risk of developing a type of skin cancer called squamous cell carcinoma.
  • Hearing Loss: Hearing loss in this condition is typically profound.

Additional features include partial hair loss (eyebrows and eyelashes) and abnormally formed nails.

Causes

KID syndrome is caused by mutations in the GJB2 gene, which provides instructions for the protein connexin 26. This protein forms gap junctions—channels that allow the transport of ions and nutrients between cells. In the inner ear, these channels maintain potassium levels necessary for hearing. In the skin, they are involved in the growth and maturation of the outermost layer (the epidermis). Mutations are thought to create "leaky" channels that impair cell health and increase cell death, leading to the symptoms observed in the skin and inner ear.

Inheritance

KID syndrome is usually inherited in an autosomal dominant pattern, where one copy of the altered gene is sufficient to cause the disorder. While some individuals inherit the mutation from a parent, most cases result from de novo (new) mutations in people with no family history of the disorder. A rarer autosomal recessive form, sometimes called Desmons syndrome, also exists and is associated with liver disease.

Frequently Asked Questions

KID syndrome is inherited in an autosomal dominant pattern, meaning only one copy of the altered GJB2 gene is needed to cause the disorder. If a parent has the condition, there is a 50 percent chance with each pregnancy that the child will inherit the mutation. However, most cases result from new (de novo) mutations that occur in the egg or sperm cell or in the early embryo, meaning the parents may not have the condition themselves. Genetic counseling is recommended for families to understand the specific inheritance pattern and recurrence risks.
The thick, scaly skin (ichthyosis) and palmoplantar keratoderma can crack and break, creating entry points for bacteria and leading to serious infections that can be life-threatening, particularly in infancy. A significant long-term risk is the development of squamous cell carcinoma, a type of skin cancer, which can occur in the areas of chronic skin damage. Regular dermatological monitoring is essential to detect pre-cancerous changes early and manage skin integrity to prevent severe secondary infections.
The hearing loss in KID syndrome is typically profound and sensorineural, resulting from the dysfunction of gap junctions in the inner ear. Because the loss is profound, hearing aids are often ineffective, and cochlear implants may be considered, though outcomes can vary. Many individuals rely on visual communication methods, such as sign language or other augmentative and alternative communication (AAC) systems. Early intervention with speech and language therapists is crucial to help individuals develop effective communication strategies despite the severity of the hearing loss.
Keratitis, or inflammation of the cornea, is a hallmark of the syndrome and can lead to scarring, abnormal blood vessel growth, and eventual blindness if not managed. Treatment often involves the use of lubricating eye drops to keep the eyes moist, bandage contact lenses to protect the cornea, and in severe cases, surgical interventions such as corneal transplantation. Regular ophthalmological exams are critical to monitor for signs of infection, scarring, or glaucoma, which can further compromise vision.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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