JEB

Junctional Epidermolysis Bullosa (JEB) is a rare genetic disorder that primarily affects the skin and mucous membranes. It is characterized by blister formation within the lamina lucida of the basement membrane zone.

Symptoms

The symptoms of JEB vary widely among affected individuals. They may include:

• Blister formation on the skin and mucous membranes
• Skin fragility
• Nail dystrophy
• Dental abnormalities
• Scarring
• Alopecia (hair loss)
• Anemia
• Growth retardation
• Respiratory problems
• Dysphagia (difficulty swallowing)

Causes

JEB is caused by mutations in the genes that encode for the proteins laminin-332, type XVII collagen, and integrin α6β4. These proteins are essential for the proper formation and functioning of the hemidesmosome, a structure that helps attach the epidermis (the outer layer of skin) to the underlying dermis.

Diagnosis

The diagnosis of JEB is typically made based on the presence of characteristic clinical features. This may be confirmed by skin biopsy, electron microscopy, immunofluorescence mapping, and/or genetic testing.

Treatment

There is currently no cure for JEB. Treatment is primarily supportive and may include:

• Wound care to prevent infection and promote healing
• Pain management
• Nutritional support
• Physical and occupational therapy
• Regular dental care
• Regular monitoring for complications

Prognosis

The prognosis for individuals with JEB varies widely and depends on the specific subtype of the disorder. Some individuals with milder forms of JEB may have a normal lifespan, while those with more severe forms may experience life-threatening complications in infancy or early childhood.

See also

• Epidermolysis bullosa
• Genetic disorder
• Skin disease

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