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. 1980 Jul;143(1):355–365. doi: 10.1128/jb.143.1.355-365.1980

Conservation and variation of nucleotide sequences within related bacterial genomes: Escherichia coli strains.

A Anilionis, M Riley
PMCID: PMC294245  PMID: 6249790

Abstract

Changes in the patterns produced by annealing restriction endonuclease digests of bacterial genomes with probe deoxyribonucleic acids (DNAs) containing small portions of a bacterial genome provide sensitive indicator of the degree of nucleotide sequence relatedness that exists in localized regions of the genomes of closely related bacteria. We have used five probe DNAs to explore the relatedness of parts of the genomes of six laboratory Escherichi coli strains. A range in in the amount of variability in the positions of restriction enzyme cleavage sites in the selected portions of the genomes was found. Portions of the genome that are believed to be inacative were more variable than portions that contained functional genes: the sites in and near regions of homology to phage lambda DNA in the genome showed the greatest variability. These regions probably represent remnants of cryptic prophages. Variability was assessed pairwise among four of the E. coli strains and ranged from 5 to > 25% base pair substitutions in the lambda-related regions. In contrast, the endonuclease cleavage sites in the trp, tna, lac, thy regions, and one other as-yet-unidentified segment of the genome were more highly conserved. It seems likely that these sites lie in genetic locations that are subject to functional constraints.

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