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The human lymphocyte micronucleus (MN) test combined with fluorescence in situ hybridization (FISH) of a centromeric probe is considered a useful screening assay to distinguish between clastogenic and aneugenic agents. Four suspected aneuploidy-inducing chemicals, acetaldehyde (AA), diethylstilbestrol (DES), diethylstilbestrol dipropionate (DESdp) and griseofulvin (GF), have been evaluated with the assay. All compounds induced a significant increase of MN at all doses tested. After the application of the FISH technique with a pancentromeric DNA sequence, DES, DESdp and GF showed a statistically significant increase in the percentage of positive signals compared with the control culture. GF induced the highest percentage of centromere-positive MN observed to date (&gt;90% on average). AA did not show a significant difference in the percentage of centromere-positive MN. The results indicate that in human lymphocytes DES, DESdp and GF act primarily as aneugens, while AA seems capable of causing both chromosome breakage and aneuploidy.

mutagenesis

Detection of the centromere in micronuclei by fluorescence <i>in situ</i> hybridization: its application to the human lymphocyte micronucleus assay after treatment with four suspected aneugens

Detection of the centromere in micronuclei by fluorescence in situ hybridization: its application to the human lymphocyte micronucleus assay after treatment with four suspected aneugens