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

Human fibroblasts expressing the human papillomavirus E6 gene are deficient in global genomic nucleotide excision repair and sensitive to ultraviolet irradiation.

We investigated the role of wild-type p53 activity in modulating nucleotide excision repair after UV irradiation in normal and p53-deficient primary human fibroblasts created by expression of the human papillomavirus 16 E6 gene. Compared with parental cells, the E6-expressing fibroblasts were deficient in global genomic repair of both UV-induced cyclobutane pyrimidine dimers and 6-4 photoproducts but exhibited normal transcription-coupled repair. The E6-expressing cells were also more sensitive than their parental counterparts to UV irradiation and displayed similar levels of UV-induced apoptosis. These results suggest that disruption of wild-type p53 function by E6 expression results in selective loss of p53-dependent global genomic nucleotide excision repair, but not UV-induced apoptosis, leading to enhanced UV sensitivity.[1]


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