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Coinheritance of 2 New Potentially Damaging Heterozygous COL7A1 Variants in a Family With Autosomal Dominant Epidermolysis Bullosa Pruriginosa.
Pediatric and Developmental Pathology 2018 March 5
Epidermolysis bullosa pruriginosa (EBP) is a rare subtype of EB which is characterized by intense pruritus with blistering and nodular or lichenoid lesions most prominent on the lower extremities. It is caused by variants in COL7A1 which encodes for type VII collagen. There is wide phenotypic and genotypic variability between affected individuals. We report 2 potentially pathogenic variants in COL7A1 occurring on the same allele in a family with EBP and autosomal dominant inheritance. Late-onset EBP and incomplete penetrance may lead to delayed presentation in affected family members with the same variants. The broad phenotypic variability seen in EBP suggests that further genotypic and environmental factors may influence presentation. Genetic and histopathological diagnosis is essential, given the considerable overlap with clinically similar presentations such as hypertrophic lichen planus.
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