title: Evaluation of the mutagenicity of 1,N6-ethenoadenine- and 3,N4-ethenocytosine-nucleosides in Salmonella typhimurium.
abstract: To provide supporting evidence for the hypothetical involvement of etheno-derivative formation in DNA in chloroacetaldehyde-mediated mutagenesis, etheno nucleosides were examined for their direct-acting mutagenicity in Salmonella typhimurium strain TA100. The results, however, have shown that 1,N6-ethenoadenosine, 1,N6-ethenodeoxyadenosine, 3,N4-ethenocytidine and 3,N4-ethenodeoxycytidine lack mutagenicity in this test system. A lesson learned in this study is that 3,N4-ethenocytosine nucleosides prepared synthetically or obtained from commercial sources can give false positive mutagenicity due to mutagenic contaminants.
mesh_terms: D000225:Adenine / Q000031:analogs & derivatives* / Q000633:toxicity; D001711:Biotransformation; D003596:Cytosine / Q000031:analogs & derivatives* / Q000633:toxicity; D004249:DNA Damage; D009152:Mutagenicity Tests; D012486:Salmonella typhimurium / Q000187:drug effects
chemical_list: C018289:3,N(4)-ethenocytosine; C004981:1,N(6)-ethenoadenine; D003596:Cytosine; D000225:Adenine