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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Reduced capacity for DNA repair synthesis in patients with or genetically predisposed to colorectal cancer.

Peripheral resting mononuclear leukocytes were compared for their capacities to repair DNA lesions induced by a 1-hour exposure to a standardized 10-microM dose of N-acetoxy-N-2-fluorenylacetamide (N-AcO-2-FAA). Leukocytes from the following 3 groups were studied: 39 control subjects, 40 patients after colonic resection because of colorectal cancer (disease-free at the time of this study), and 28 individuals with a hereditary predisposition to colorectal cancer. Although the level of N-AcO-2-FAA that bound to mononuclear leukocyte DNA was the same for the various population groups, the level of N-AcO-2-FAA-induced unscheduled DNA synthesis (UDS) was significantly reduced in the mononuclear leukocytes of individuals who had had colorectal cancer or a genetic predisposition for the disease. These findings indicate that a deficiency in mononuclear leukocyte DNA repair synthesis is associated with the development of colorectal cancer in these populations. Our observation of this nonspecific UDS deficiency (relating to colorectal cancer) was not explained by experimental variations among the sampled groups with regard to individual differences in lymphocyte heterogeneity, age, sex, smoking habits, or blood pressure.[1]


  1. Reduced capacity for DNA repair synthesis in patients with or genetically predisposed to colorectal cancer. Pero, R.W., Miller, D.G., Lipkin, M., Markowitz, M., Gupta, S., Winawer, S.J., Enker, W., Good, R. J. Natl. Cancer Inst. (1983) [Pubmed]
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