Sequence specificity of cyclobutane pyrimidine dimers in DNA treated with solar (ultraviolet B) radiation

David L. Mitchell, Jin Jen, James E. Cleaver

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Cyclobutane pyrimidine dimers were quantified at the sequence level after irradiation with solar ultraviolet (UVB) and nonsolar ultraviolet (UVC) light sources. The yield of photoproducts at specific sites was dependent on the nucleotide composition in and around the potential lesion as well as on the wavelength of ultraviolet light used to induce the damage. Induction was greater in the presence of 5' flanking pyromidines than purines; 5' guanine inhibited induction more than adenine. UVB irradiation increased the induction of cyclobutane dimers containing cytosine relative to thymine homodimers. At the single UVC and UVB fluences used, the ratio of thymine homodimers (T< >T) to dimers containing cytosine (C< >T, T< >C, C< >C) was greater after UVC compared to UVB irradiation.

Original languageEnglish (US)
Pages (from-to)225-229
Number of pages5
JournalNucleic acids research
Issue number2
StatePublished - Jan 25 1992


ASJC Scopus subject areas

  • Genetics

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