title: Epigenotoxicity of environmental pollutants evaluated by a combination of DNA methylation inhibition and capillary electrophoresis-laser-induced fluorescence immunoassay.
abstract: A variety of environmental pollutants may cause abnormal DNA methylation, which further disturb gene expression. In this work, we developed a rapid and sensitive method for the characterization and identification of the epigenotoxicity of environmental pollutants in terms of DNA methylation. The method combines in vitro inhibition reactions of a model DNA methyltransferase (DNMT) with rapid and sensitive capillary electrophoresis-laser-induced fluorescence (CE-LIF) immunoassays. This method was first assessed using two known DNMT inhibitors, (-)-epigallocatechin-3-gallate and RG108, and then applied to epigenotoxic evaluation of four aldehydes and six benzo-1,4-quinones. It was found that all these electrophilic chemicals could inhibit DNMT activity, probably due to their interactions with the active sites of DNMT. Interestingly, benzo-1,4-quinones displayed more inhibitory effects on DNMT activity than aldehydes. Among the tested six benzo-1,4-quinones, halogenated benzo-1,4-quinone showed higher inhibitory activity than non-halogenated p-benzo-1,4-quinone. Owing to its speed and sensitivity, our method will be potentially applicable for fast epigenotoxic screening of environmental pollutants and mechanistic study of environmental epigenetics.
authors: State Key Laboratory of Environmental Chemistry and Eco-toxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China.
authors: Xiaoli
authors: X
authors: Wang
authors: Hailin
authors: H
authors: Wang
mesh_terms: D004247:DNA / Q000737:chemistry; D019175:DNA Methylation; D015254:DNA Modification Methylases / Q000032:analysis / Q000037:antagonists & inhibitors*; D019075:Electrophoresis, Capillary / Q000295:instrumentation / Q000379:methods*; D004785:Environmental Pollutants / Q000032:analysis* / Q000633:toxicity; D004791:Enzyme Inhibitors / Q000032:analysis* / Q000633:toxicity; D007118:Immunoassay / Q000295:instrumentation / Q000379:methods*
chemical_list: D004785:Environmental Pollutants; D004791:Enzyme Inhibitors; D004247:DNA; D015254:DNA Modification Methylases