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- W2053898413 abstract "Spontaneous and methyl methanesulphonate-induced HPRT-deficient mutants were analysed for changes in the hprt gene structure using multiplex polymerase chain reaction. The PCR amplification pattern of 21 MMS-induced mutations revealed one total deletion of the hprt coding exons and one small deletion within exon 5, while 19 mutants showed the V79 wild-type pattern. Molecular analysis of 30 spontaneous mutations revealed no mutants with amplification patterns which differed from those of wild-type cells. We further analysed MMS-induced mutants in a different V79 cell line with a high (40%) spontaneous deletion frequency. MMS caused a dose-dependent increase in the mutant frequency but the incidence of deletions was reduced to 6% at 2 x 10(-4) M and to 13% at 5 x 10(-4) M indicating that mainly point mutations were induced. The repair inhibitor cytosine arabinoside (araC) enhanced mutation induction by MMS but did not change the proportion of deletions in the mutation spectrum. The results indicate that different V79 cell lines spontaneously produce different amounts of deletion mutations. The frequency of MMS-induced deletions does not depend on the frequency of spontaneous deletions in a given cell line. The MMS-induced mutation spectrum seems to be unchanged even at high concentrations with a strong cytotoxic effect. Deletions are not increased as a consequence of araC-inhibited repair of MMS-induced lesions." @default.
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- W2053898413 date "1993-01-01" @default.
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- W2053898413 title "Molecular characterization of methyl methanesulphonate (MMS)-induced HPRT mutations in V79 cells" @default.
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- W2053898413 doi "https://doi.org/10.1016/0165-7992(93)90058-4" @default.
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