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. 1977 Apr;130(1):167-72.
doi: 10.1128/jb.130.1.167-172.1977.

Method for the isolation of Escherichia coli mutants with enhanced recombination between chromosomal duplications

E B Konrad

Method for the isolation of Escherichia coli mutants with enhanced recombination between chromosomal duplications

E B Konrad. J Bacteriol. 1977 Apr.

Abstract

A method is described for the isolation of Escherichia coli mutants that show increased recombination between a pair of chromosomal duplications. These "hyper-rec" mutants display a variety of secondary phenotypes. I have isolated a large number of hyper-rec mutants and found them useful in screening for mutants that accumulate labeled DNA fragments after short pulses with [3H]thymidine. The mutants so recovered include ones that are defective in deoxyribonucleic acid ligase, deoxyribonucleic acid polymerase I and its associated 5' yields 3' exonuclease, and a group of mutants, dnaS, that accumulate abnormally short Okazaki fragments. Evidence is presented that suggests that the lac-att80 segment of the chromosome cannot be inverted.

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References

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