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- W2022301700 abstract "The extensive knowledge of the genetics of Drosophila melanogaster and the long experimental experience with this organism have made it of unique usefulness in mutation research and genetic toxicology. The development of somatic mutation and recombination tests (SMART) has provided sensitive, rapid and cheap assays for investigations of mutagenic and recombinogenic properties of chemicals. The present paper deals with the SMART wing spot assay, developed by Graf et al. (1984). The use of two genetic markers, multiple wing hair (mwh) and flare (flr) in the third chromosome, makes it possible to discern localized recombinogenic effects on the two intervals--the major, euchromatic, part of the chromosome, and the mostly heterochromatic centromere region. The distribution of induced mitotic recombination varied between test chemicals. Ethylene oxide caused a specific increase of twin spots, indicating a localized induction of somatic recombination in the centromere region. The wing spot assay has turned out to be suitable for combined treatment with chemicals in order to study antimutagenic and other modulating effects by mutagenic and recombinogenic chemicals. Examples of the use of this assay for such a purpose are presented in this paper. The inhibitor of poly ADP-ribosylation, 3-aminobenzamide (3AB), caused a pronounced increase of wing spots, induced by alkylating agents. The data indicate that this interaction between alkylating agents and 3AB is solely due to an effect on somatic recombination but not on point mutations. The inhibitor of topoisomerases, novobiocin, which presumably acts on the chromatin configuration, had different modulating effects on spots induced by methyl methanesulfonate (MMS) and ethylnitrosourea (ENU). Novobiocin essentially acted as an antirecombinogenic agent in cotreatment experiments with MMS and as antimutagenic agent with ENU. Attempts to interfere with mutagenic and recombinogenic effects of the radical-generating agents bleomycin, menadione and paraquat, by agents acting on the defence mechanisms against oxygen radicals, were essentially unsuccessful." @default.
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- W2022301700 date "1992-06-01" @default.
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- W2022301700 title "Modulation of genotoxicity in Drosophila" @default.
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- W2022301700 doi "https://doi.org/10.1016/0027-5107(92)90066-b" @default.
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