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Updated: Aug 12, 2026

Recognition of Epidermal Transglutaminase by IgA and Tissue Transglutaminase 2 Antibodies in a Rare Case of Rhesus Dermatitis
Published on: December 15, 2011
A case of linear IgA disease: an immunofluorescent study using confocal laser scan microscopy
T Kobayashi1, A Konohana, S Hattori
1Department of Dermatology, Saiseikai Yokohamashi Nanbu Hospital, Yokohama, Japan.
Insights
This study identified IgA-based autoimmune blistering skin disease in a Japanese woman. Direct and indirect immunofluorescence confirmed linear IgA deposition in the basement membrane zone, indicating a novel autoimmune blistering condition.
Area of Science:
- Dermatology
- Immunodermatology
- Pathology
Background:
- Autoimmune blistering diseases are a group of rare disorders characterized by autoantibodies against structural components of the skin.
- Linear IgA bullous dermatosis (LABD) is an uncommon autoimmune blistering disease typically presenting with vesicles and bullae.
Abstract:
A 79-year-old Japanese woman presented with erythema and bullae on her trunk and limbs. Histological examination of the skin lesions showed subepidermal bullae and polymorphonuclear leukocyte infiltration into the papillary dermis. A direct immunofluorescent study showed the linear deposition of IgA, but not of IgG or IgM, in the basement membrane zone. Indirect immunofluorescence of the serum using confocal laser scan microscopy showed IgA, but not IgG, reactivity in the basement membrane zone. In double immunostaining experiments, IgA reactivity was also observed on the epidermal side; laminin 5 was detected on the dermal side.
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