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Updated: Jul 8, 2026

Comprehensive Assessment of Germline Chemical Toxicity Using the Nematode Caenorhabditis elegans
Published on: February 22, 2015
Electrochemical genotoxicity screening for arylamines bioactivated by N-acetyltransferase
Minjeong So1, Eli G Hvastkovs, Besnik Bajrami
1Department of Chemistry, 55 North Eagleville Road, University of Connecticut, Storrs, CT 06269, USA.
Abstract:
Genotoxicity screening sensors that measure DNA damage from metabolism of arylamines were developed and evaluated. The sensors feature ultrathin films containing DNA and N-acetyltransferase (NAT) on pyrolytic graphite (PG) electrodes. NAT in the film catalyzed the conversion of the arylamine 2-aminofluorene (2-AF) to 2-acetylaminofluorene (2-AAF) by acetyl coenzyme A (AcCoA) dependent N-acetylation, as verified by liquid chromatography. DNA damage in the films from exposure to reactive 2-AF metabolites was measured subsequent to the enzyme reaction using catalytic voltammetric oxidation with Ru(bpy)32+. Square wave voltammetric (SWV) peaks increased with enzyme reaction time, and relative DNA damage rates at pH 5.8 were measured within 2 min. Control incubations of DNA/NAT films without AcCoA gave no significant sensor response. CapLC-MS/MS analysis of 2-AAF/DNA reaction products was consistent with 2-AF-guanine adducts formed in the films. DNA damage occurred more rapidly under weakly acidic conditions (pH 5.5-5.8) than at neutral pH, suggesting that genotoxicity from arylamine metabolism by NAT could be more significant in slightly acidic environments.
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