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• W1977331254 endingPage "82" @default.
• W1977331254 startingPage "75" @default.
• W1977331254 abstract "We compared the induction of gene mutations and chromosomal aberrations by ethylating agents in lacZ transgenic mice (Muta Mouse). Chromosomal aberrations were detected by the peripheral blood micronucleus assay. Gene mutations were detected in the lacZ transgene. A small amount of blood was sampled from a tail vessel during the expression time for fixation of gene mutations in vivo; this enabled us to detect and compare clastogenicity and gene mutations in the identical mouse. Single intraperitoneal injections of ENU (50-200 mg/kg) and EMS (100-400 mg/kg) strongly induced micronucleated reticulocytes (MN) detectable in peripheral blood 48 h after treatment. The maximum MN frequencies induced were 6.6% and 3.3% for ENU (100 mg/kg) and EMS (400 mg/kg), respectively (the control value was 0.3%). lacZ mutant frequency (MF) was analyzed in bone marrow and liver 7 days after treatment. Spontaneous MFs were 2.0-4.6 x 10(-6). MF in bone marrow was increased by ENU to 3.4 x 10(-5) at 200 mg/kg and induced by EMS to 1.8 x 10(-5) at 400 mg/kg. In liver, however, both chemicals at their highest doses induced only slight increases in MF. The induction of both micronuclei and lacZ mutations in bone marrow by both ENU and EMS correlated better with O6-ethylguanine adducts than with N7-ethylguanine adducts. The mutants (19 for ENU and 12 for EMS) were subjected to DNA sequence analysis. Among EMS-induced mutations, 75% were GC to AT transitions, which were probably caused by O6-ethylguanine. Among ENU-induced mutations, in contrast, 40% occurred as AT base pair substitutions (6 AT to TA transversions and 2 AT to GC transitions) (no such mutations were induced by EMS). These results, together with the known reactivity of ENU to thymine suggest that thymine adducts play a significant role in the ENU mutagenesis." @default.
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• W1977331254 date "1997-12-01" @default.
• W1977331254 modified "2023-10-12" @default.
• W1977331254 title "A comparison of the genotoxicity of ethylnitrosourea and ethyl methanesulfonate in lacZ transgenic mice (Muta™Mouse)" @default.
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• W1977331254 doi "https://doi.org/10.1016/s1383-5718(97)00144-7" @default.
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