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Postlabeling methods for carcinogen-DNA adduct analysis.

K Randerath, E Randerath, H P Agrawal

    Environmental Health Perspectives
    |October 1, 1985
    PubMed
    Summary
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    A new 32P-postlabeling assay enables carcinogen-DNA adduct detection without radioactive carcinogens. This method significantly expands the study of chemical interactions with DNA, identifying adducts in human placenta DNA from smokers.

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Toxicology

    Background:

    • Traditional carcinogen-DNA binding studies rely on radioactive carcinogens, limiting research scope.
    • A vast number of potentially mutagenic/carcinogenic chemicals are not readily available in radioactive forms.

    Purpose of the Study:

    • To develop a non-radioactive method for studying carcinogen-DNA interactions.
    • To extend the scope of carcinogen-DNA binding studies beyond isotopically labeled chemicals.

    Main Methods:

    • A novel 32P-postlabeling assay incorporates radioactivity into DNA after chemical modification.
    • DNA is exposed to non-radioactive carcinogens in vitro or in vivo.
    • Radioactivity is introduced using polynucleotide kinase-catalyzed [32P]phosphate transfer from [gamma-32P]ATP.

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  • Adducts are detected via autoradiography of thin-layer chromatograms and quantified by scintillation counting.

    • Main Results:

    • The 32P-postlabeling assay successfully detected DNA adducts for known carcinogens in rodent tissues.
    • Adducts were identified in DNA from human placenta of smokers.
    • The method can detect one adduct per 10^9 to 10^10 nucleotides for bulky/aromatic adducts.
    • Approximately 80 compounds have been studied using this assay.

    Conclusions:

    • The 32P-postlabeling assay provides a sensitive, non-radioactive alternative for carcinogen-DNA adduct detection.
    • This method broadens the investigation of chemical carcinogenesis and DNA damage.
    • The assay has potential applications in human biomonitoring, as evidenced by findings in smokers' placenta DNA.