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Frequent allelic losses within chromosomal band 17q25.1 in a variety of human cancers have suggested the presence of one or more tumor suppressor genes in this region. Furthermore, a genetic locus responsible for familial focal nonepidermolytic palmoplantar keratoderma, a condition associated with cancer of the esophagus, lies in the same region. This esophageal-cancer susceptibility locus, TOC (tylosis with oesophageal cancer), might be a target of deletions at 17q25.1 in multiple types of malignancy. Using the reverse transcriptase-polymerase chain reaction (RT-PCR) to examine cancer cell lines for alterations in the expression of transcripts from this portion of 17q, we identified a novel gene that we designated DMC1 (downregulated in multiple cancer-1). The full-length cDNA is 3293bp long. Its putative product is an integral membrane protein of 788 amino acids, belonging to the class of so-called 'inside-out" membrane proteins; it lacks a signal sequence but contains an N-terminal cytoplasmic domain, a single transmembrane peptide, and a C-terminal extracellular domain. We documented loss of expression of DMC1 in 2 of 10 breast-cancer cell lines, in 7 of 10 cervical-cancer lines, in 7 of 13 hepatocellular-cancer lines, in 3 of 7 lung-cancer lines, in 3 of 6 thyroid-cancer lines, in 2 of 6 gastric-cancer lines, and in 2 of 4 renal cell-cancer lines. Our results suggest that loss of expression of the DMC1 gene at 17q25.1 may play an important role in the development of cancers in a broad range of human tissues.

Identification of DMC1, a novel gene in the TOC region on 17q25.1 that shows loss of expression in multiple human cancers