Lamellar ichthyosis with a novel homozygous C-terminal

Int. J. Dermatol. · Nov 2009

Case Reports

Lamellar ichthyosis with a novel homozygous C-terminal mutation in the transglutaminase-1 gene.

The majority of cases of Lamellar ichthyosis (LI) are caused by mutations in the transglutaminase-1 (TGM1) gene. The mutations in the beta-barrel domains of the TGM1 gene are found very infrequently and several authors have suggested that these domains are not essential for the function of the enzyme. Other authors have postulated that mutations in these loci are pathogenic but they imply a less severe clinical picture of LI. ⋯ This finding indicates that the integrity of beta-barrel domains is important for the correct function of the enzyme and that we are still far away from a consistent genotype-phenotype correlation.

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- Laura Rodríguez-Pazos, Manuel Ginarte, Ana Vega-Gliemmo, and Jaime Toribio.
- Department of Dermatology, Faculty of Medicine, Complejo Hospitalario Universitario, Santiago de Compostela, Spain. ladrizos@hotmail.com
- Int. J. Dermatol. 2009 Nov 1; 48 (11): 1195-7.
BackgroundThe majority of cases of Lamellar ichthyosis (LI) are caused by mutations in the transglutaminase-1 (TGM1) gene. The mutations in the beta-barrel domains of the TGM1 gene are found very infrequently and several authors have suggested that these domains are not essential for the function of the enzyme. Other authors have postulated that mutations in these loci are pathogenic but they imply a less severe clinical picture of LI.Case ReportWe report a patient with a severe phenotype of LI who had a homozygous mutation affecting the beta-barrel 2 domain of the TGM1.ConclusionsThis finding indicates that the integrity of beta-barrel domains is important for the correct function of the enzyme and that we are still far away from a consistent genotype-phenotype correlation.

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Lamellar ichthyosis with a novel homozygous C-terminal mutation in the transglutaminase-1 gene.

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