title: Enzymatic shot-gun 5'-phosphorylation and 3'-sister phosphate exchange: a two-dimensional thin-layer chromatographic technique to measure DNA deoxynucleotide modification.
abstract: DNA adducts occur through environmental, therapeutic, dietary, oxygen stress, and aging processes. A modified thin-layer chromatographic (TLC) technique can asses base composition and adduct formation. This requires labeling DNA by "shot-gun" 5'-phosphorylation of representative 32P-alpha-deoxyribonucleotide monophosphates. Subsequent 3'-monophosphate digest "sister exchanges" a radioactive 32PO4(2-) to the neighboring cold nucleotide. Separation in two-dimensional polyethyleneimine-cellulose TLC is carried out in acetic acid, (NH4)2SO4, and (NH4)HSO4. The technique was applied to control DNA, cold substitution of dUMP, methylation, depurination, and pBR322. This technique quantifies low-molecular-mass adducts and DNA integrity both in vivo and in vitro.
authors.affiliation: Department of Pathology, Albert Einstein College of Medicine, Bronx, NY 10461.
authors.forename: J J
authors.initials: JJ
authors.lastname: Steinberg
authors.forename: A
authors.initials: A
authors.lastname: Cajigas
authors.forename: M
authors.initials: M
authors.lastname: Brownlee
mesh_terms: D000818:Animals; D001345:Autoradiography; D002417:Cattle; D002855:Chromatography, Thin Layer / Q000379:methods; D004247:DNA / Q000378:metabolism*; D004249:DNA Damage; D003854:Deoxyribonucleotides / Q000378:metabolism*; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008745:Methylation; D009943:Organophosphorus Compounds / Q000378:metabolism*; D010766:Phosphorylation
chemical_list: D003854:Deoxyribonucleotides; D009943:Organophosphorus Compounds; D004247:DNA