Kim MJ, Lee SC, Kang SH, Choo J, Song JM. Quantification of UV-induced cyclobutane pyrimidine dimers using an oligonucleotide chip assay.
Anal Bioanal Chem 2010;
397:2271-7. [PMID:
20473657 DOI:
10.1007/s00216-010-3793-6]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2010] [Revised: 04/23/2010] [Accepted: 04/26/2010] [Indexed: 10/19/2022]
Abstract
A lesion-specific enzyme-induced DNA strand break assay was developed for an oligonucleotide chip for the determination of UVB-induced cyclobutane pyrimidine dimers (CPDs). A 20-mer of fluorophore-labeled and biotinylated oligonucleotide was immobilized on the chip. CPDs in DNA on the chip were formed by UVB irradiation (312 nm). T4 endonuclease V (T4N5) was used to excise the CPD site as T4N5 sensitively and specifically detects CPDs. The fluorophore-labeled DNA fragments were detected by a laser-induced fluorescence (LIF) detection system. The number of CPDs induced by UVB was determined based on a mathematical equation obtained from a predetermined calibration curve. The yield of UVB-induced CPDs was 1.73 CPDs per megabase per (kJ/m(2)). The reliability of this value was proved by its similarity to reference values obtained from gel electrophoresis. The developed assay has strong potential to quantify most kinds of UV-induced DNA lesions.
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