Abstract
Extensive restriction-fragment-length polymorphism was revealed in Escherichia coli strains by using a region of the bacteriophage M13 genome as a DNA hybridization probe. This variation was observed across natural strains, in clinical samples, and to a lesser extent in laboratory strains. The sequence in M13 which revealed this fingerprint pattern was a region of the gene III coat protein, which contains two clusters of a 15-base-pair repeat. Oligonucleotides made to a consensus of these repeats also revealed the fingerprint profile. While this consensus sequence has significant homology to the lambda chi site sequence, an oligonucleotide made of the chi sequence did not reveal polymorphic fingerprint patterns in E. coli. The strain variation revealed by the M13 and M13-derived oligonucleotide probes will be useful for bacterial characterization and should find use in studies of bacterial evolution and population dynamics. The findings raise questions about what these repeated sequences are and why they are so variable.
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