Human Molecular Genetics Advance Access originally published online on August 18, 2004
Human Molecular Genetics 2004 13(20):2473-2482; doi:10.1093/hmg/ddh263
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Human Molecular Genetics, Vol. 13, No. 20 © Oxford University Press 2004; all rights reserved
Mutations in ichthyin a new gene on chromosome 5q33 in a new form of autosomal recessive congenital ichthyosis
1Centre National de Génotypage and 2Généthon, Evry, France, 3Department of Dermatology, CHU Bab-El-Oued, Algiers, Algeria and 4Department of Dermatology and 5DNA and Cell Bank Tübitak, Hacettepe University, Ankara, Turkey
Received June 16, 2004; Accepted August 4, 2004
We report the genomic localization by homozygosity mapping and the identification of a gene for a new form of non-syndromic autosomal recessive congenital ichthyosis. The phenotype usually presents as non-bullous congenital ichthyosiform erythroderma with fine whitish scaling on an erythrodermal background; larger brownish scales are present on the buttocks, neck and legs. A few patients presented a more generalized lamellar ichthyosis. Palmoplantar keratoderma was present in all cases, whereas only 60% of the patients were born as collodion babies. Six homozygous mutations including one nonsense and five missense mutations were identified in a new gene, ichthyin, on chromosome 5q33 in 23 patients from 14 consanguineous families from Algeria, Colombia, Syria and Turkey. Ichthyin encodes a protein with several transmembrane domains which belongs to a new family of proteins of unknown function localized in the plasma membrane (PFAM: DUF803), with homologies to both transporters and G-protein coupled receptors. This family includes NIPA1, in which a mutation was recently described in a dominant form of spastic paraplegia (SPG6). We propose that ichthyin and NIPA1 are membrane receptors for ligands (trioxilins A3 and B3) from the hepoxilin pathway.
* To whom correspondence should be addressed. Tel: +33 160878357; Fax: +33 160878383; Email: fischer{at}cng.fr
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