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- W2025423580 abstract "Psoriatic patients undergoing psoralen plus ultraviolet radiation (PUVA) therapy are susceptible for squamous cell carcinoma and melanoma of the skin. To investigate the etiological relevance of PUVA for these diseases, we performed mutation spectrometry on the cII transgene in mouse embryonic fibroblasts treated with a single or split PUVA dose (PUVA-I or PUVA-II, respectively). Both treatments were significantly mutagenic as they increased the cII mutant frequency up to 3.7-fold over background, and produced different mutational spectra from that derived spontaneously (p<0.01), but not from one another. The signature of induced mutations, i.e., T to C transitions and T to A transversions with significant site-specificities, i.e., adjacent to T bases at the 3'-neighboring side and to pyrimidines at the 5'-neighboring side, was more pronounced after PUVA-II treatment. Also, the overall mutations occurring at T bases with the same site-specificities were more prevalent after PUVA-II treatment. The characteristic PUVA-induced mutations predominate in the p53 mutational spectrum in controlled in vivo test systems or in high-dose PUVA-treated patients, and also are easily recognizable in the overall PUVA-treated patients. We conclude that PUVA-induced mutagenesis is initiated by PUVA-I treatment and subsequently, augmented by PUVA-II treatment, leaving a unique mutational signature on the cII transgene. The signature mutations of PUVA are discernible in the p53 mutational spectrum in PUVA-treated patients but complex exposure to other therapeutic/environmental carcinogens also leads to the frequent occurrence of other types of mutations in this population." @default.
- W2025423580 created "2016-06-24" @default.
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- W2025423580 date "2004-12-01" @default.
- W2025423580 modified "2023-10-11" @default.
- W2025423580 title "Biological Consequences of 8-Methoxypsoralen-Photoinduced Lesions: Sequence-Specificity of Mutations and Preponderance of T to C and T to A Mutations" @default.
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- W2025423580 doi "https://doi.org/10.1111/j.0022-202x.2004.23502.x" @default.
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