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Ultraviolet (UV) radiation induces cyclobutane pyrimidine dimers (CPDs) and (6-4) photoproducts ((6-4)PPs) in DNA, which may give rise to clusters of cells expressing mutant p53 (‘p53 patches’) and eventually to skin carcinomas. We have previously reported that some basal cells in murine skin accumulate CPDs upon chronic low-level UV exposure and that these CPD-retaining basal cells (CRBCs) encompass...
Several mouse models with defects in genes encoding components of the nucleotide excision repair (NER) pathway have been developed. In NER two different sub-pathways are known, i.e. transcription-coupled repair (TC-NER) and global-genome repair (GG-NER). A defect in one particular NER protein can lead to a (partial) defect in GG-NER, TC-NER or both. GG-NER defects in mice predispose to cancer, both...
Cancer is caused by the loss of controlled cell growth due to mutational (in)activation of critical genes known to be involved in cell cycle regulation. Three main mechanisms are known to be involved in the prevention of cells from becoming cancerous; DNA repair and cell cycle control, important to remove DNA damage before it will be fixed into mutations and apoptosis, resulting in the elimination...
The nucleotide excision repair (NER) pathway comprises two sub-pathways, transcription coupled repair (TCR) and global genome repair (GGR). To establish the importance of these separate sub-pathways in tumor suppression, we exposed mice deficient for either TCR (Csb), GGR (Xpc) or both (Xpa) to 300ppm 2-acetylaminofluorene (in feed, ad libitum) in a unique comparative exposure experiment. We found...
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