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. 1988 Apr;170(4):1610–1616. doi: 10.1128/jb.170.4.1610-1616.1988

Polymorphisms in the umuDC region of Escherichia species.

S G Sedgwick 1, M Robson 1, F Malik 1
PMCID: PMC211008  PMID: 2895099

Abstract

The umuDC operon of Escherichia coli encodes mutagenic DNA repair. The umuDC regions of multiple isolates of E. coli, E. alkalescens, and E. dispar and a single stock of E. aurescens were mapped by nucleotide hybridization. umuDC is located at one end of a conserved tract of restriction endonuclease sites either 12.5 or 14 kilobase pairs long. Rearrangements, including possible deletions, were seen in the polymorphic DNA flanking the conserved tract. Restriction site polymorphisms were not found around the DNA repair gene recA or polA. The junctions of the conserved region contain direct repeats of nucleotide sequences resembling the termini of the Tn3 group of transposons. Possible mechanisms for the generation of these variants are discussed.

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Selected References

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