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Analysis of filaggrin mutations and expression in corneal specimens from patients with or without atopic dermatitis

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Thabo Lapp, Claudia Auw-Haedrich, Thomas Reinhard, Rhiannon Evans, Elke Rodríguez, Stephan Weidinger, Thilo Jakob

Original languageEnglish
Pages (from-to)20-4
Number of pages5
JournalInternational Archives of Allergy and Immunology
Volume163
Issue number1
DOIs
Published1 Mar 2014

Bibliographical note

© 2013 S. Karger AG, Basel.

King's Authors

Abstract

BACKGROUND: Filaggrin is expressed in the epidermis and is essential for the maintenance of the epidermal barrier. Null mutations within the filaggrin gene (FLG) lead to a disturbed epidermal barrier and are associated with a significantly increased risk of atopic dermatitis (AD). The association of AD with ocular surface disorders prompted us to speculate that common FLG mutations may be particularly prevalent in AD patients with ocular comorbidities.

METHODS: Corneal buttons and biopsies from AD patients with ocular involvement (n = 11) and from non-atopic patients (n = 9) with a histological diagnosis of keratitis were included in the study. DNA samples obtained from paraffin-embedded corneal specimens were genotyped for the two most common FLG mutations (R501X and 2282del4). Filaggrin protein expression was analysed by immunohistochemistry.

RESULTS: Normal skin and corneal specimens (n = 6) were positive for filaggrin, which could be detected in the stratum corneum of the skin and in the basal epithelial layer of the cornea. Interestingly, all AD corneal specimens as well as the specimens from keratitis patients without AD were negative for filaggrin expression. Genotyping of the FLG mutations R501X and 2282del4 revealed wild-type alleles in all analysed samples.

CONCLUSIONS: The lack of filaggrin expression observed in the analysed corneal specimens from AD patients is not due to the two most common FLG mutations (R501X, 2282del4) but is most likely secondary to inflammation, as all keratitis specimens of non-AD patients showed lack of filaggrin expression as well.

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