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Epidermolysis bullosa simplex due to plakophilin deficiency
Epidermolysis bullosa simplex due to plakophilin deficiency (EBS-PD) is a suprabasal subtype of epidermolysis bullosa simplex (EBS, see this term) characterized by generalized superficial erosions and less commonly blistering.
Prevalence is unknown but 11 cases have been reported to date.
Onset of the disease is usually at birth with skin blistering and generalized erythema which rapidly regresses. Skin erosions and crusting are associated with dystrophic nails, hypotrichosis or alopecia with absent or sparse eyelashes and eyebrows, palmoplantar keratoderma with painful fissuring, chronic cheilitis with perioral cracking. Occasionally hair may be woolly rather than reduced. Other variable cutaneous findings and symptoms include follicular hyperkeratosis, perianal erythema and erosions, inflammatory scaly plaques in the flexures, and pruritus. Extracutaneous involvement is usually present, typically with growth retardation, and, in some cases, with recurrent infections, chronic diarrhea, tongue fissuring, and blepharitis.
EBS-PD is due to mutations in the PKP1 (1q32) gene encoding plakophilin-1.
Transmission is autosomal recessive.
The disease is frequently associated with significant morbidity, but life-expectancy does not seem to be affected.
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