Measurement of Pyrimidine (6-4) Photoproducts in DNA by a Mild Acidic Hydrolysis-HPLC Fluorescence Detection Assay

Article abstract of DOI:10.1021/tx00044a010

Pyrimidine (6-4) pyrimidone photoproducts constitute one of the major classes of DNA lesions induced by far-UV irradiation. However, their biological role remains difficult to assess partly because of the lack of a specific and sensitive assay for monitoring their formation in DNA. Here is presented a measurement method based on the release of the (6-4) base adducts from DNA followed by an HPLC separation associated with a sensitive and specific fluorescence detection. The quantitative and mechanistic aspects of the chemical hydrolysis, based on the use of hydrogen fluoride stabilized in pyridine, were investigated, using dinucleoside monophosphate (6-4) photoproducts as model compounds. The final hydrolysis products were isolated and characterized by UV, fluorescence, mass, and 1H NMR spectroscopies. Application of the assay to far-UV irrradiated calf thymus DNA provided information on the sequence effect on the rate of formation of three of the four possible bipyrimidine (6-4) photoproducts.