Kindler Syndrome - Causes, Symptoms, and Treatment

Introduction:

Kindler syndrome is a congenital disease affecting the skin. It affects people in the early infancy period. Common skin areas include the back of the hands and the top of the feet. The other areas include moist mouth lining, esophagus, eyes, and genitals. There will be scarring on the hands due to repeated blisters. These fuse with the skin between the fingers and toes. Thickening of the skin of the hands and soles of the feet may lead to squamous cell carcinoma. Understanding the diagnosis and treatment of the condition can prevent complications. The article discusses Kindler syndrome, its causes, symptoms, diagnosis, and treatment.

What Is Kindler Syndrome?

Kindler syndrome is an autosomal recessive skin disease that makes the skin fragile and more prone to blistering. In 1954, Kindler first described Kindler syndrome. It is a rare subtype of epidermolysis bullosa in which there is a mixed blistering pattern within the skin's basement membrane and beneath it. Besides blistering, the skin often becomes thin and wrinkled. In addition to skin disease, the condition may cause other problems, such as eye irritation, gum inflammation, and dental problems. Some people may experience digestive system problems and certain types of cancers.

Careful management is required to treat the condition. Kindler syndrome can be prevented by protecting the skin from minor injuries and sun exposure. Prompt treatment is required to prevent infections and complications. The healthcare team, including dermatologists, ophthalmologists, and dentists, may work together to manage the condition. The other names of Kindler syndrome are described below:

• Bullous acro keratotic poikiloderma of Kinder and Weary.

• Poikiloderma hereditary acrokeratosis.

• Congenital poikiloderma with bullae Weary type.

• Congenital bullous poikiloderma.

• Poikiloderma of Kindler.

• Poikiloderma hereditary acrokeratosis.

What Is Epidermolysis Bullosa?

Epidermolysis bullosa is a group of rare diseases causing blisters on the skin and mucous membrane. It may occur in any body part. However, friction sites and trauma on the feet and hands, as well as heat and rubbing, may worsen the condition. In severe cases, blister formation also affects internal organs, such as the stomach lining, esophagus lining, and respiratory tract. The condition may affect children and infants. Mild cases of epidermolysis bullosa do not require treatment and can be resolved independently.

What Are the Causes of Kindler Syndrome?

Kindler epidermolysis bullosa occurs due to mutations in the gene FERMT1. This gene provides direction for making the kindlin-1 protein, which is present in the cells lining body surfaces and cavities. In the skin, the kindlin-1 protein is present on the outer skin layer and plays a role in keratinocyte cells. The kindlin-1 protein plays an important role in cell growth, cell division, cell adhesion to proteins and molecules, and cell migration.

Due to the FERMT1 gene mutation, hindrances in the kindlin-1 protein and cell functions will occur. Keratinocytes will have an abnormal structure and function. They will not be able to divide and grow properly. They will not be able to attach the upper skin layer (epidermis) to the lower skin layer (dermis). This makes the skin more fragile and more susceptible to blister formation. Deficiency of the kindlin-1 protein in the epithelial cells can cause skin damage or fragility.

It is an autosomal recessive disorder, which means the affected infant may develop the condition by receiving two copies of the mutated gene, one from each parent. Parents may have one copy of the mutated gene but do not show any signs or symptoms.

What Are the Signs and Symptoms of Kindler Syndrome?

Kindler syndrome is a rare condition that can be severe. It mainly affects the skin and other body parts, such as the eyes, nails, and internal organs. The signs and symptoms of Kindler syndrome are as follows:

Dermatological Symptoms: The skin manifestations are as follows:

• Skin Blisters: It is the initial sign and is noticeable. Blisters may affect the hands, feet, and internal organs lining, such as the eyes, intestines, mouth, urinary tract, genitals, and esophagus. These blisters may be exacerbated by sun exposure or minor injuries. This symptom may begin in infancy or childhood.

• Photosensitivity: The affected person may be more sensitive to sunlight or bright light, which can lead to sunburn and blister formation.

• Hyperkeratosis: The affected skin of the hands and feet may be thickened and hardened.

• Skin Atrophy: The affected skin may be fragile, thin, or wrinkled.

• Poikiloderma: The skin condition that causes dark and light spots, skin redness, and skin thinning.

• Skin Discoloration: There may be skin discoloration.

Other Symptoms: The other symptoms associated with Kindler syndrome are as follows:

• Gingivitis: Gum inflammation causes dental issues, such as receding gums, blistering in the mouth, and tooth loss.

• Skin Mucosa Involvement: Blister may affect the mouth's and esophagus's internal mucosal lining.

• Eye Problems: There may be skin irritation and inflammation, causing more serious eye problems.

• Digestive Issues: Due to the involvement of the internal mucosal lining, swallowing may be difficult, esophageal strictures (abnormal esophageal lumen narrowing) may occur, and gastrointestinal issues may arise.

• Cancer: Skin or mucosal cancers, such as squamous cell carcinoma, may have higher chances.

• Hand and Foot Abnormalities: Due to repeated blistering and scarring, webbing or contractures of the fingers and toes may develop.

• Nail Abnormalities: There may be nail thickening, ridging, and even nail loss.

How Is Kindler Syndrome Diagnosed?

The healthcare provider may ask the patient about associated symptoms, family history, and skin issues, such as blistering and photosensitivity. In addition, the healthcare provider may physically examine the skin to look for signs of blistering, skin atrophy, and hyperpigmentation. Genetic testing is done to determine gene mutations. This will confirm the diagnosis by identifying the specific gene mutations causing the condition. A small skin sample is taken to look for changes in the skin structure, such as skin layer disorganization. Immunofluorescence testing is performed to detect specific proteins in the skin. Furthermore, the eyes and gums are examined for eye-related symptoms and gum inflammation. An endoscopy is conducted to rule out digestive issues.

How Is Kindler Syndrome Treated?

The treatment strategies associated with Kindler syndrome are as follows:

• Proper care of blisters by sterile dressings and topical antibiotics.

• Regular use of moisturizers to prevent skin dryness.

• Avoid sun exposure by wearing protective clothing and sunscreens.

• Maintenance of oral hygiene to prevent gum inflammation and dental problems by regular brushing and flossing.

• Use antiseptic mouthwash to manage gum disease.

• Wear sunglasses to prevent light sensitivity.

• Use lubricating eye drops to reduce eye irritation.

• Eat soft foods to manage esophageal strictures.

• The healthcare provider may prescribe topical corticosteroids to reduce inflammation and blister healing and over-the-counter pain relievers to manage blistering and skin damage pain.

• Genetic counseling educates and guides affected individuals and families in understanding the condition.

• Physical therapy to improve hand and foot mobility.

Conclusion:

Kindler syndrome is a rare hereditary condition affecting the skin, eyes, and lining of the internal organs. The most common associated symptoms are blister formation and photosensitivity. Topical corticosteroids, antiseptic mouthwash, moisturizers, and physical therapy can manage the condition. With proper diagnosis and treatment, patients can live fulfilling lives. If someone has blister issues, they should consult a dermatologist to prevent complications.