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• W2153448038 endingPage "3091" @default.
• W2153448038 startingPage "3079" @default.
• W2153448038 abstract "To elucidate the involvement of specific ultraviolet (UV) wavelengths in solar mutagenesis, we used a laser system to investigate the induction of DNA damage, both in the overall genome and at the nucleotide resolution level, in the genomic DNA of transgenic Big Blue mouse fibroblasts irradiated with a series of UV wavelengths, inclusive of UVC (λ<280 nm), UVB (λ=280–320 nm), and UVA (λ>320 nm). Subsequently, we sought correlation between the locations of UV-induced DNA lesions in the cII transgene of irradiated DNA samples and the frequency distribution and codon position of the induced cII mutations in counterpart mouse cells irradiated with simulated sunlight. Using a combination of enzymatic digestion assays coupled with gel electrophoresis, immunodot blot assays, and DNA footprinting assays, we demonstrated a unique wavelength-dependent formation of photodimeric lesions, i.e., cyclobutane pyrimidine dimers (CPDs) and (6–4) photoproducts [(6–4)PPs], based on direct UV absorption of DNA, in irradiated mouse genomic DNA, which could partially explain the induction of mutations in mouse cells irradiated with simulated sunlight. Most notably, there was a divergence of CPD and (6–4)PP formation at an irradiation wavelength of 296 nm in mouse genomic DNA. Whereas substantial formation of (6–4)PPs was detectable in samples irradiated at this wavelength, which intensified as the irradiation wavelength decreased, only small quantities of these lesions were found in samples irradiated at wavelengths of 300–305 nm, with no detectable level of (6–4)PPs in samples irradiated with longer wavelengths. Although CPD formation followed the same pattern of increase with decreasing wavelengths of irradiation, there were substantial levels of CPDs in samples irradiated with UVB wavelengths borderlined with UVA, and small but detectable levels of these lesions in samples irradiated with longer wavelengths. Because the terrestrial sunlight spectrum rolls off sharply at wavelengths ~300 nm, our findings suggest that CPDs are the principal lesion responsible for most DNA damage-dependent biological effects of sunlight.—Besaratinia, A., Yoon, J.-I., Schroeder, C., Bradforth, S. E., Cockburn, M., Pfeifer, G. P. Wavelength dependence of ultraviolet radiation-induced DNA damage as determined by laser irradiation suggests that cyclobutane pyrimidine dimers are the principal DNA lesions produced by terrestrial sunlight. FASEB J. 25, 3079–3091 (2011). www.fasebj.org" @default.
• W2153448038 created "2016-06-24" @default.
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• W2153448038 date "2011-05-25" @default.
• W2153448038 modified "2023-10-14" @default.
• W2153448038 title "Wavelength dependence of ultraviolet radiation‐induced DNA damage as determined by laser irradiation suggests that cyclobutane pyrimidine dimers are the principal DNA lesions produced by terrestrial sunlight" @default.
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• W2153448038 doi "https://doi.org/10.1096/fj.11-187336" @default.
• W2153448038 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3157686" @default.
• W2153448038 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21613571" @default.
• W2153448038 hasPublicationYear "2011" @default.
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