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J Invest Dermatol. 2001 May;116(5):806-8.

Novel keratin 17 mutations in pachyonychia congenita type 2.

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  • 1Epithelial Genetics Group, Human Genetics Unit, Department of Molecular and Cellular Pathology, Ninewells Medical School, Dundee, UK. fjsmith@hgmp.mrc.ac.uk


Pachyonychia congenita type 2 is an inherited ectodermal dysplasia characterized by hypertrophic nail dystrophy and multiple pilosebaceous cysts. Focal nonepidermolytic palmoplantar keratoderma, natal teeth, and pili torti may also be present. Epithelial tissues affected in pachyonychia congenita type 2 express the keratin pair K6b/K17. Here, we report three novel heterozygous mutations in the K17 gene (KRT17A) in patients presenting with pachyonychia congenita type 2. These mutations, R94-98del (deletion of the peptide sequence RLASY) and missense mutations R94P and L95Q, are all within the 1A domain hotspot for pathogenic keratin mutations.

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