Summary
The error rate for DNA replication in Escherichia coli has been estimated as one error per 108−1011 base pairs replicated. This level of accuracy is considerably higher than that predicted on the basis of free-energy calculations or that achieved by DNA polymerases in vitro. The existence of an excision repair mechanism acting upon mismatched base pairs could account, at least in part, for the accuracy achieved in vivo. Such a repair mechanism has been postulated to account for a number of genetic observations related to gene conversion and high negative interference phenomena. Furthermore, the increased spontaneous mutability of Pnemococcus hex - and E. coli uvrE - mutants that appear to be deficient in the repair of some mismatched base pairs indicates the involvement of mismatch repair in the suppression of spontaneous mutation rates, The existence of a mismatch repair system capable of efficiently correcting mispaired bases implies that a strand discrimination system must exist which allows the discrimination between the “incorrect” newly synthesized daughter strand and the “correct original parental strand.
As DNA methylation is a postreplicational process (i.e., newly synthesized strands are undermethylated). DNA methylation is one possible mechanism allowing the discrimination between parental and daughter DNA strands. In accordance with this hypothesis is the observation that dam mutants that are deficient in 6-methyladenine residues occurring at the 5′G-A-T-C3′ sequence are spontaneous mutators. These strains are also hypermutable by base analogs, e.g. 2-aminopurine.
Further mutants of E. coli have been isolated that are defective in mismatch repair. These mutants, which include mutH, mutL, mutS and uvrE, increase spontaneous base transition and frameshift rates by as much as 103. These mutations also affect the level of negative interference seen in phage crosses for closely linked markers as well as cellular sensitivity to alkylating agents. More direct evidence in favor of the above hypothesis has been obtained from phage a heteroduplex assays where the DNA strands are specifically methylated or nonmethylated. These experiments show the preferential loss of the genetic marker carried on the nonmethylated DNA strand consistent with this hypothesis.
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Glickman, B.W. (1982). Methylation-Instructed Mismatch Correction as a Postreplication Error Avoidance Mechanism in Escherichia Coli . In: Lemontt, J.F., Generoso, W.M. (eds) Molecular and Cellular Mechanisms of Mutagenesis. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-3476-7_3
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DOI: https://doi.org/10.1007/978-1-4613-3476-7_3
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