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Spectrum of spontaneous missense mutations causing cyclic AMP-resistance phenotypes in cultured S49 mouse lymphoma cells differs markedly from those of mutations induced by alkylating mutagens

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Somatic Cell and Molecular Genetics

Abstract

Mutants of S49 mouse lymphoma cells resistant to cytolysis by analogs of cyclic AMP (cAMP) generally have missense mutations in the gene encoding the regulatory subunit of cAMP-dependent protein kinase. We have compared the mutations in 95 spontaneous isolates with those in 60 mutagen-induced isolates by sequence analysis of amplified cDNAs. Twenty-nine single basepair substitutions in 19 codons produced selectable phenotypes. The spontaneous mutant spectrum was dominated by a CpG transition hotspot in the codon for Arg334. This and other nearby CpG sites were found to be methylated in genomic S49 cell DNA by restriction enzyme analyses. Most of the remaining spontaneous mutants had either G-C→C-G or T-A→G-C transversions, which have been associated with damage caused by oxygen radicals. In contrast, the majority of mutants induced with the alkylating mutagens ethyl methanesulfonate (EMS) and N-methyl-N′-nitro-N-nitrosoguanidine had G-C→A-T mutations at non-CpG sites; in addition, EMS induced several A-T→G-C, A-T→T-A, and G-C→T-A substitutions. A single ICR191-induced mutant analyzed had a unique A-T→G-C lesion. A number of spontaneous and mutagen-induced isolates had closely linked double or triple substitutions, and two isolates had tandem triple substitutions.

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  1. Department of Biochemistry and Molecular Biology, University of Oklahoma Health Sciences Center, 73190, Oklahoma City, Oklahoma

    Karen B. Gorman & Robert A. Steinberg

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  1. Karen B. Gorman
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Gorman, K.B., Steinberg, R.A. Spectrum of spontaneous missense mutations causing cyclic AMP-resistance phenotypes in cultured S49 mouse lymphoma cells differs markedly from those of mutations induced by alkylating mutagens. Somat Cell Mol Genet 20, 301–311 (1994). https://doi.org/10.1007/BF02254719

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