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Vet Pathol 39:576-580 (2002)
© 2002 American College of Veterinary Pathologists
BRIEF COMMUNICATIONS AND CASE REPORTS

Equine Epitheliogenesis Imperfecta in Two American Saddlebred Foals Is a Lamina Lucida Defect

L. D. Lieto, T. W. Swerczek and E. G. Cothran

Abstract

Necropsy of two American Saddlebred fillies diagnosed with epitheliogenesis imperfecta (EI) revealed missing patches of epithelium of the skin and oral mucosa as well as dental abnormalities. Examination of the digestive tract did not reveal signs of pyloric atresia in either foal. Histopathologic examination revealed separation of the epidermis from the dermis. In both foals a division within the lamina lucida of the basal lamina was observed by transmission electron microscopy. In comparison with an age-specific control, the ultrastructure of intact skin from the EI-affected foals showed abnormal hemidesmosomes, which lacked a subbasal plate. The morphological and ultrastructural defects observed in the EI-affected American Saddlebred foals were similar to those observed in Herlitz junctional epidermolysis bullosa–affected human newborns, which is caused by a defect in one of the subunits of laminin-5. The close similarity of lesions of the human and equine diseases suggests that EI may be caused by a laminin-5 defect.

Key words: Epidermolysis bullosa; epitheliogenesis imperfecta; horses.

Request reprints from Dr. L. D Lieto, Twinbrook II RM 205, 12441 Parklawn Dr, Rockville MD 20852-1742 (USA). E-mail: llieto{at}niaid.nih.gov.




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M.-O. Benoit-Biancamano, R. Drolet, and S. D'Allaire
Aplasia cutis congenita (epitheliogenesis imperfecta) in swine: observations from a large breeding herd
J Vet Diagn Invest, November 1, 2006; 18(6): 573 - 579.
[Abstract] [Full Text] [PDF]


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