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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1988 May;85(10):3499–3503. doi: 10.1073/pnas.85.10.3499

Spectrum of spontaneous mutation at the APRT locus of Chinese hamster ovary cells: an analysis at the DNA sequence level.

P J de Jong 1, A J Grosovsky 1, B W Glickman 1
PMCID: PMC280239  PMID: 3368459

Abstract

The spectrum of spontaneous mutation of an endogenous mammalian cell gene has been determined at the DNA sequence level. Thirty independent spontaneous APRT- mutations were cloned and subsequently completely sequenced. Twenty-seven contained single base substitutions. Of these, 22 were G.C to A.T transitions, suggesting a major role for the deamination of cytosine in spontaneous mutagenesis of Chinese hamster ovary cells. The remaining mutants included a tandem double substitution, a -1 frameshift, and a 17-base-pair deletion flanked by a 2-base-pair direct repeat. Many of the independently recovered mutants were clustered at sites of multiple occurrence (hot spots). One site accounted for greater than 25% of all independently recovered events. Mutations were generally located within the coding sequence, although two mutations occurred within the consensus sequence for a 3' splice site.

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Selected References

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