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Expanding the keratin mutation database: novel and recurrent mutations and genotype-phenotype correlations in 28 patients with epidermolytic ichthyosis.

Arin M.J., Oji V., Emmert S., Hausser I., Traupe H., Krieg T., Grimberg G.

BACKGROUND: Epidermolytic ichthyosis (EI) is a hereditary keratinization disorder caused by mutations in the keratin 1 (KRT1) or keratin 10 (KRT10) genes. In most cases of severe EI, heterozygous single point mutations are found at the highly conserved helix boundary motifs of KRT1 and KRT10 that play a critical role in filament formation. The presence of palmoplantar keratoderma suggests KRT1 mutations, whereas KRT10 mutations in most instances give rise to the nonpalmoplantar variants. OBJECTIVES: To identify the underlying mutations in patients with EI and to correlate genotype and phenotype. METHODS: Mutation analysis was performed in 28 patients with EI by direct sequencing of KRT1 and KRT10 genes. RESULTS: We identified 14 different mutations, of which four have not been published previously. CONCLUSIONS: Identification of novel mutations and genotype-phenotype correlations in EI allows improved understanding of disease pathogenesis as well as better patient management.

Br. J. Dermatol. 164:442-447(2011) [PubMed] [Europe PMC]

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