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. 1992 Aug 1;89(15):7036–7040. doi: 10.1073/pnas.89.15.7036

Similarity of spontaneous germinal and in vitro somatic cell mutation rates in humans: implications for carcinogenesis and for the role of exogenous factors in "spontaneous" germinal mutagenesis.

R D Kuick 1, J V Neel 1, J R Strahler 1, E H Chu 1, R Bargal 1, D A Fox 1, S M Hanash 1
PMCID: PMC49640  PMID: 1495998

Abstract

The rate of spontaneous mutation resulting in electrophoretic variants per cell generation in a human lymphoblastoid cell line, on the basis of experiments described in this paper, is found to be 7.2 x 10(-8) per locus. A review of similar data on electrophoretic variants resulting from spontaneous mutation in the human germ line leads to an estimate of 3.3 x 10(-8) per locus per cell generation. It is argued that the similarity of these two estimates, despite an average cell generation time of 18.5 hr for the cultured somatic cells but about 26 days in the germ line, suggests that spontaneous mutation involving nucleotide substitutions is much more dependent on cell generation than on time. This finding permits the inference that environmental (exogenous) variables make a relatively small contribution to the rate of this type of human germinal spontaneous mutation. While in vitro somatic-cell mutation rates, such as derived in this study, provide a basis for modeling the contribution of nucleotide substitutions in multihit/clonal theories of carcinogenesis, it is also argued that the complex of events involved in carcinogenesis, including chromosomal rearrangements and mitotic recombination, could have very different individual probabilities. Estimates for the rates of these other types of mutation are needed to provide a better understanding of the manner in which multiple mutations accumulate in malignant cells.

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Selected References

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