title: DNA repair mutant pso2 of Saccharomyces cerevisiae is sensitive to intracellular acetaldehyde accumulated by disulfiram-mediated inhibition of acetaldehyde dehydrogenase.
abstract: Blocking aldehyde dehydrogenase with the drug disulfiram leads to an accumulation of intracellular acetaldehyde, which negatively affects the viability of the yeast Saccharomyces cerevisiae. Mutants of the yeast gene PSO2, which encodes a protein specific for repair of DNA interstrand cross-links, showed higher sensitivity to disulfiram compared to the wild type. This leads us to suggest that accumulated acetaldehyde induces DNA lesions, including highly deleterious interstrand cross-links. Acetaldehyde induced the expression of a PSO2-lacZ reporter construct that is specifically inducible by bi- or poly-functional mutagens, e.g., nitrogen mustard and photo-activated psoralens. Chronic exposure of yeast cells to disulfiram and acute exposure to acetaldehyde induced forward mutagenesis in the yeast CAN1 gene. Disulfiram-induced mutability of a pso2Delta mutant was significantly increased over that of the isogenic wild type; however, this was not found for acetaldehyde-induced mutagenesis. Spontaneous mutability at the CAN1 locus was elevated in pso2Delta, suggesting that growth of glucose-repressed yeast produces DNA lesions that, in the absence of Pso2p-mediated crosslink repair, are partially removed by an error-prone DNA repair mechanism. The use of disulfiram in the control of human alcohol abuse increases cellular acetaldehyde pools, which, based on our observations, enhances the risk of mutagenesis and of other genetic damage.
authors.affiliation: Pós-Graduação em Genética e Biologia Molecular, Universidade Estadual de Santa Cruz, Ilhéus, BA, Brasil.
authors.forename: M
authors.initials: M
authors.lastname: Brendel
authors.forename: G
authors.initials: G
authors.lastname: Marisco
authors.forename: I
authors.initials: I
authors.lastname: Ganda
authors.forename: R
authors.initials: R
authors.lastname: Wolter
authors.forename: C
authors.initials: C
authors.lastname: Pungartnik
mesh_terms: D000079:Acetaldehyde / Q000378:metabolism* / Q000494:pharmacology; D000427:Alcohol Deterrents / Q000494:pharmacology*; D000445:Aldehyde Oxidoreductases / Q000037:antagonists & inhibitors*; D026923:Amino Acid Transport Systems, Basic / Q000235:genetics; D004249:DNA Damage; D004260:DNA Repair; D004271:DNA, Fungal / Q000235:genetics; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D004221:Disulfiram / Q000494:pharmacology*; D004706:Endodeoxyribonucleases; D006801:Humans; D016296:Mutagenesis; D009154:Mutation; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000187:drug effects* / Q000235:genetics / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism*
chemical_list: D000427:Alcohol Deterrents; D026923:Amino Acid Transport Systems, Basic; C502212:CAN1 protein, S cerevisiae; D004271:DNA, Fungal; D004268:DNA-Binding Proteins; D009687:Nuclear Proteins; D029701:Saccharomyces cerevisiae Proteins; D000445:Aldehyde Oxidoreductases; C018699:aldehyde dehydrogenase (NAD(P)+); D004706:Endodeoxyribonucleases; C090162:PSO2 protein, S cerevisiae; D000079:Acetaldehyde; D004221:Disulfiram