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Formation of Covalent DNA Adducts by Enzymatically Activated Carcinogens and Drugs In Vitro and Their Determination by 32P-postlabeling
Published on: March 20, 2018
The 32P-postlabeling assay for DNA adducts
David H Phillips1, Volker M Arlt
1Institute of Cancer Research, Brookes Lawley Building, Cotswold Road, Sutton, Surrey SM2 5NG, UK. david.phillips@icr.ac.uk
Nature Protocols
|November 17, 2007
Summary
The 32P-postlabeling assay is a highly sensitive method for detecting carcinogen-DNA adducts, even at low frequencies. This technique is valuable for environmental exposure studies and various research applications.
Area of Science:
- Biochemistry
- Molecular Biology
- Toxicology
Background:
- Carcinogen-DNA adducts are critical biomarkers of exposure to harmful agents.
- Detecting these adducts requires highly sensitive and specific analytical methods.
Purpose of the Study:
- To describe the 32P-postlabeling analysis, an ultrasensitive method for carcinogen-DNA adduct detection and quantitation.
- To highlight its applicability in various research settings and its ability to detect low-frequency adducts.
Main Methods:
- DNA digestion to nucleoside 3'-monophosphates.
- Enrichment of the adduct fraction.
- 5'-labeling of adducts using 32P-orthophosphate and polynucleotide kinase (PNK).
- Separation and quantitation of labeled adducts via chromatography or electrophoresis.
Main Results:
- The assay is ultrasensitive, detecting adducts at frequencies as low as 1 in 10(10) nucleotides.
- Requires only microgram quantities of DNA.
- Applicable to environmental exposures and physiological concentrations of agents.
Conclusions:
- 32P-postlabeling analysis is a versatile and sensitive tool for DNA adduct detection.
- Suitable for human, animal, and in vitro studies involving diverse compounds and complex mixtures.
- Provides a rapid (3-day) protocol for adduct analysis.
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