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. 1991 Feb 15;88(4):1374–1378. doi: 10.1073/pnas.88.4.1374

In vivo mapping of a DNA adduct at nucleotide resolution: detection of pyrimidine (6-4) pyrimidone photoproducts by ligation-mediated polymerase chain reaction.

G P Pfeifer 1, R Drouin 1, A D Riggs 1, G P Holmquist 1
PMCID: PMC51020  PMID: 1996338

Abstract

DNA adducts in unique sequences along the mammalian genome are mapped in vivo at single-nucleotide resolution. Pyrimidine (6-4) pyrimidone photoproducts [(6-4) photoproducts] represent one of the two major adduct classes found after UV irradiation of DNA and were shown to play an important role in UV-induced mutagenesis. After UV light treatment of cells, DNA is prepared and chemically cleaved at (6-4) photoproducts with piperidine. Gene-specific fragments are then amplified from total genomic DNA by use of a ligation-mediated polymerase chain reaction. Analysis of the human chromosome X-linked phosphoglycerate kinase (PGK1) gene's promoter has shown that the frequency of (6-4) photoproducts expressed as piperidine-labile sites is (i) high at TpC and CpC dinucleotides, (ii) dependent on the nearest-neighbor bases, (iii) inhibited by the binding of a transcription factor, and (iv) different for DNA derived from the active and inactive X chromosome. This latter difference is mainly a consequence of the presence of 5-methylcytosine (m5C) in CpG dinucleotides on the inactive X chromosome. 5-Methylcytosine in the sequences Tm5CG and Cm5CG inhibits the formation of (6-4) photoproducts. Thus, in addition to in vivo mapping of a DNA adduct at nucleotide resolution, we also report another method for methylation analysis and photofootprinting.

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Selected References

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