Thymidylate synthase (TS), an enzyme that is essential for DNA synthesis and repair has been identified as an important biomarker for colorectal and other human cancers. The elevated steady-state levels of TS found in many common human malignancies have been thought to represent a secondary event in tumor formation. However, it has recently been demonstrated that the deregulated levels of ectopic TS may also have a causal effect on tumorgenesis since overexpression of human TS transforms immortalized mammalian cells to a malignant phenotype. Since the levels of TS are regulated by E2F-1 and thus are linked to the cell cycle pathway, regulating TS activity may be an important factor for the control of cell cycle progression and for the development of therapeutic strategies and cancer prevention.
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