Linkage Studies in Erythrokeratodermias: Fine Mapping, Genetic Heterogeneity, and Analysis of Candidate Genes

Erythrokeratodermias are a clinically heterogeneous group of rare autosomal dominant disorders of cornification with overlapping features including hyperkeratosis and erythema. We ascertained five extended pedigrees with different phenotypes for a linkage study. Three families presented with localiz...

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Bibliographic Details
Published in:	Journal of investigative dermatology Vol. 109; no. 5; pp. 666 - 671
Main Authors:	Richard, Gabriela, Lin, Jing-Ping, Smith, Lisa, Whyte, Yolanda M., Itin, Peter, Wollina, Uwe, Epstein, Ervin, Hohl, Daniel, Giroux, Jean-Mario, Charnas, Lawrence, Bale, Sherri J., DiGiovanna, John J.
Format:	Journal Article
Language:	English
Published:	Danvers, MA Elsevier Inc 01-11-1997 Nature Publishing
Subjects:	ataxia Biological and medical sciences chromosome 1 Chromosome Mapping Chromosomes, Human, Pair 1 - genetics connexin Connexins - genetics Dermatology Erythema - genetics erythrokeratodermia variabilis Gap Junction alpha-4 Protein Genes - genetics Genetic Heterogeneity Genetic Linkage greither disease Haplotypes Hereditary diseases of the skin. Congenital diseases of the skin. Haemangioma of the skin, of mucosae and of soft tissue Humans Hyperpigmentation - genetics Keratosis - genetics Medical sciences Pedigree Phenotype ataxia erythrokeratodermia variabilis chromosome 1 connexin greither disease Genetic mapping Human Dyskeratosis Skin disease Linkage Genetic marker Erythroderma Family study Hyperkeratosis Genetic disease Phenotype Progressive erythrokeratoderma Haplotype Erythrokeratoderma variabilis
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Summary:	Erythrokeratodermias are a clinically heterogeneous group of rare autosomal dominant disorders of cornification with overlapping features including hyperkeratosis and erythema. We ascertained five extended pedigrees with different phenotypes for a linkage study. Three families presented with localized erythrokeratodermia variabilis, and one with erythrokeratodermia and ataxia. Another family had Greither disease associated with variable hyperkeratotic plaques. Despite their phenotypic differences, both erythrokeratodermia variabilis and erythrokeratodermia with ataxia map to a common region in 1p34–p35. Multipoint linkage and haplotype analyses place erythrokeratodermia variabilis between the marker D1S496 and D1S186 with a maximum LOD score of 12.88. Our linkage results provide compelling evidence for genetic homogeneity among families of mixed European and French–Canadian origin. In contrast, results excluded Greither's disease from the established erythrokeratodermia variabilis gene region indicating genetic heterogeneity of erythrokeratodermias. Based on recombinations, two genes assigned to 1p34–p35 were excluded: cartilage matrix protein and avian myelocytosis viral oncogene. Connexin-37 (GJA4), a member of the connexin gene family, maps within the erythrokeratodermia variabilis region and is an attractive candidate gene. Direct sequencing of the coding region of GJA4 in four patients revealed several variations, including a novel polymorphism within the 5' cytoplasmic domain, but no pathogenic mutations were found, thus excluding Connexin-37 as a candidate. There is evidence, however, that other epidermally expressed connexins cluster in this region, and one may yet be determined to play a role in the pathogenesis of erythrokeratodermia variabilis.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0022-202X 1523-1747
DOI:	10.1111/1523-1747.ep12337713