We previously identified ps20 protein as a secreted growth inhibitor and purified the protein from fetal rat prostate urogenital sinus mesenchymal cell conditioned medium. The rat cDNA was subsequently cloned, and ps20 was found to contain a WAP-type four-disulfide core motif, indicating it may function as a protease inhibitor. We now report cloning and characterization of the mouse ps20 gene (designated Wfdc1), the human homolog cDNA, and the human gene (designated WFDC1). Both the mouse and human WFDC1 genes consist of seven exons and encode respective ps20 proteins sharing 79.1% identity and nearly identical WAP motifs in exon 2. The WFDC1 gene was mapped by FISH analysis to human Chromosome (Chr) 16q24, an area of frequent loss of heterozygosity (LOH) previously identified in multiple cancers including prostate, breast, hepatocellular, and Wilms' tumor. Identification and characterization of the WFDC1 gene may aid in better understanding the potential role of this gene and ps20 in prostate biology and carcinogenesis.
Mammalian Genome – Springer Journals
Published: Feb 13, 2014
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