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Recessive dystrophic epidermolysis bullosa (RDEB) is caused by a mutation in the type-VII collagen gene COL7A1. Anchoring fibrils in the cutaneous basement membrane zone are few and poorly developed in this disease, resulting in extensive scarring, blistering, and erosions of the skin and mucous membranes.
Prompted by findings in animal studies that intradermal injections of normal human fibroblasts can generate new human type-VII collagen and anchoring fibrils at the dermal–epidermal junction, investigators injected cultured fibroblasts into small areas of skin in five patients with RDEB (2 had severe Hallopeau-Siemens RDEB, 1 had moderate disease, and 2 had milder forms). Preinjection biopsy samples showed marked reductions in anchoring fi…