In congenital junctional epidermolysis bullosa , defect is seen in?: (A) Laminin 5, (B) Collagen type 7, (C) Collagen 4, (D) Collagen 3
Answer is A. EB comprises a group of genetically determined skin fragility disorders characterized by blistering of the skin and mucosae following mild mechanical trauma. Congenital epidermolysis bullosa of 3 types: 3 types Defect 1. Epidermolysis Bullosa Simplex 2. Epidermolysis Bullosa Junctional 3. Epidermolysis Bullosa Dystrophicans K5 / 14Q LamininQ Collagen-7Q Cogentinal is DIF Negative because no antibodies. Acquired epidermolysis bullosa: Ab against NCD (non collagenous domain) of Collagen 7 therefore DIF Positive