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Molecular Biology and Genetics |
Department of Molecular Biology, The University of Medicine and Dentistry of New Jersey, School of Osteopathic Medicine, Stratford, New Jersey 08084 [M. V. M., S. M-W., G. C., R. D. L.], and Departments of Medical Oncology [J. S., H-J. L.] and Preventive Medicine [M. C. Y.], The University of Southern California/Norris Comprehensive Cancer Center, Los Angeles, California 90033
Thymidylate synthase (TS) gene expression is modulated by a polymorphism in the 5' regulatory region of the gene. The polymorphism consists mainly of either two repeats (2R) or three repeats (3R) of a 28-bp sequence, yielding greater TS gene expression and protein levels with a 3R genotype. Two USF family E-box consensus elements are found within the tandem repeats of the 3R genotype, and one is found within the 2R genotype. These elements bind USF proteins in vitro by electrophoretic mobility shift analysis and in vivo by chromatin immunoprecipitation assay. We show that the additional USF consensus element within the 3R construct confers greater transcriptional activity relative to the 2R construct. Mutagenesis of the USF sites shows that the transcriptional regulation of TS is dependent, in part, on USF proteins binding within the tandem repeats. In addition, we identified a novel G
C single nucleotide polymorphism in the second repeat of 3R alleles within the USF consensus element that alters the ability of USF proteins to bind and thus alters the transcriptional activation of TS gene constructs bearing this genotype. Through RFLP analysis, we determined the respective frequencies of the C allele (3RC) among all 3R alleles in non-Hispanic whites, Hispanic whites, African Americans, and Singapore Chinese to be 56%, 47%, 28%, and 37%, respectively. Based on our findings, this novel single nucleotide polymorphism should be considered when the 5' tandem repeat polymorphism is being used as a predictor of clinical outcome to TS inhibitors.
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