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Journal Article
Research Support, Non-U.S. Gov't
INK4a-ARF mutations in skin carcinomas from UV irradiated hairless mice.
Molecular Carcinogenesis 2004 April
To characterize further the role of the INK4a-ARF locus in the multistep process of skin carcinogenesis, we performed a mutational analysis of this locus in skin lesions from hairless mice either irradiated with UVB alone or with a solar simulator delivering UVA + B. INK4a-ARF mutations were present in five of 57 squamous cell carcinomas (9%), but no mutation was detected in precancerous lesions. All mutations were C:G > T:A transitions located at dipyrimidic sites, the hallmark of UVB mutagenesis. Three mutations affected only the p19(ARF) reading frame, whereas two mutations affected only the p16(INK4a) transcript. This study demonstrates for the first time UV-induced mutations of INK4a-ARF that occur in a small percentage in late stages skin tumors.
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