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Department of Urology, Veterans Affairs Medical Center, and University of California San Francisco, San Francisco, California 94121
E-cadherin plays a critical role in many aspects of cell adhesion, epithelial development, and the establishment and maintenance of epithelial polarity. The loss of the adhesive function of E-cadherin is a critical step in the promotion of epithelial cells to a more malignant phenotype. We identified a C/A single nucleotide polymorphism at -160 from the transcriptional start site of the E-cadherin gene promoter. Transient transfection experiments showed that the A allele of this polymorphism decreased the transcriptional efficiency by 68% compared with the C allele (P < 0.001). Electrophoretic mobility shift and footprinting assays revealed that the C allele had a stronger transcriptional factor binding strength than the A allele. These results indicate that the -160 C/A polymorphism has a direct effect on E-cadherin gene transcriptional regulation. This allelic variation may be a potential genetic marker that can help identify those individuals at higher risk for invasive/metastatic diseases.
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