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Pubmed ID :10620133
Publication Date : //

Human elastase 1: evidence for expression in the skin and the identification of a frequent frameshift polymorphism.


Human pancreatic elastase 1 is a serine protease which maps to the chromosomal region 12q13 close to a locus for an autosomal dominant skin disease, diffuse nonepidermolytic palmoplantar keratoderma, and was investigated as a possible candidate gene for this disorder. Expression of two elastase inhibitors, elafin and SLPI, has been related to several hyperproliferative skin conditions. elastase 1 is functionally silent in the human pancreas but elastase 1 expression at the mRNA level was detected in human cultured primary keratinocytes. Antibody staining localized the protein to the basal cell layer of the human epidermis at a number of sites including the palmoplanta. Sequencing of genomic DNA from individuals with/without the keratoderma revealed a sequence variant, which would result in a premature truncation of the protein. This sequence variant, however, did not segregate with the skin disease and, indeed, was found to occur at a relatively high frequency in the population. Individuals homozygous for the variant do not have any obvious skin abnormalities. Based on the analysis of the secondary structure of the translated putative protein, the truncation is unlikely to result in knock-out of the elastase, but may cause destabilization of the enzyme-inhibitor complex.

Authors : Talas U , Dunlop J , Khalaf S , Leigh I M , Kelsell D P ,

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