Ichthyosis, Follicular Atrophoderma, and Hypotrichosis Caused by Mutations in ST14 is Associated with Impaired Profilaggrin Processing

Thomas Alef, Serena Torres, Ingrid Hausser, Dieter Metze, Umit Türsen, Gilles G Lestringant, Hans Christian Hennies

Research output: Contribution to journalArticle

72 Citations (Scopus)

Abstract

Congenital ichthyosis encompasses a heterogeneous group of disorders of cornification. Isolated forms and syndromic ichthyosis can be differentiated. We have analyzed two consanguineous families from the United Arab Emirates and Turkey with an autosomal recessive syndrome of diffuse congenital ichthyosis, patchy follicular atrophoderma, generalized and diffuse nonscarring hypotrichosis, marked hypohidrosis, and woolly hair (OMIM 602400). By genome-wide analysis, we found a homozygous interval on chromosome 11q24-q25 and obtained a LOD score of 4.0 at D11S910. We identified a homozygous splice-site mutation in the Arab patients and a frame-shift deletion in the Turkish patient in the gene suppression of tumorigenicity-14 (ST14). The product of ST14, matriptase, is a type II transmembrane serine protease synthesized in most human epithelia. Two missense mutations in ST14 were recently described in patients with a phenotype of ichthyosis and hypotrichosis, indicating diverse activities of matriptase in the epidermis and hair follicles. Here we have further demonstrated the loss of matriptase in differentiated patient keratinocytes, reduced proteolytic activation of prostasin, and disturbed processing of profilaggrin. As filaggrin monomers play a pivotal role in epidermal barrier formation, these findings reveal the link between congenital disorders of keratinization and filaggrin processing in the human skin.

Original languageEnglish
Pages (from-to)862-869
Number of pages8
JournalJournal of Investigative Dermatology
Volume129
Issue number4
DOIs
Publication statusPublished - Apr 2009
Externally publishedYes

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