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• W2077831710 startingPage "162" @default.
• W2077831710 abstract "Inorganic arsenic is nongenotoxic in the Drosophila melanogaster wing somatic mutation and recombination test (SMART). Recent evidence in mammalian systems indicates that methylated metabolites of arsenic are more genotoxic than inorganic arsenic. Thus, we hypothesized that inorganic arsenic is nongenotoxic in Drosophila because they are unable to biotransform arsenic to methylated forms. In the present study, we fed trivalent and pentavalent inorganic arsenic to Drosophila larvae and adults and measured the production of methylated derivatives. No biomethylated arsenic species were found in the organisms or in the growth medium, which suggests that Drosophila are unable to biomethylate inorganic arsenic. Exposure of Drosophila to the methylated arsenic derivative dimethylarsinic acid (DMA(V)) resulted in incorporation of this organoarsenic compound without demethylation. In addition, we used the SMART wing spot assay, which measures loss of heterozygosity (LOH) resulting from gene mutation, chromosomal rearrangement, chromosome breakage, and chromosome loss, to evaluate the genotoxicity of DMA. DMA by itself induced significant increases in the frequency of total spots, small spots, and large single spots. These results are consistent with the important role of arsenic biomethylation as a determinant of the genotoxicity of arsenic compounds. The absence of biomethylation in Drosophila could explain the lack of genotoxicity for inorganic arsenic and the genotoxicity of methylated arsenic species in the SMART wing spot assay." @default.
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• W2077831710 date "2006-01-01" @default.
• W2077831710 modified "2023-10-11" @default.
• W2077831710 title "Metabolism of arsenic inDrosophila melanogaster and the genotoxicity of dimethylarsinic acid in the Drosophila wing spot test" @default.
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• W2077831710 doi "https://doi.org/10.1002/em.20178" @default.
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