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Genetics, Vol 126, 505-517, Copyright © 1990
INVESTIGATIONS |
Molecular Evolution of the Escherichia coli Chromosome. III. Clonal Frames
R. Milkman and M. M. Bridges
Department of Biology, The University of Iowa, Iowa City, Iowa 52242
PCR fragments, 1500-bp, from 15 previously sequenced regions in the Escherichia coli chromosome have been compared by restriction analysis in a large set of wild (ECOR) strains. Prior published observations of segmental clonality are confirmed: each of several sequence types is shared by a number of strains. The rate of recombinational replacement and the average size of the replacements are estimated in a set of closely related strains in which a clonal frame is dotted with occasional stretches of DNA belonging to other clones. A clonal hierarchy is described. Some new comparative sequencing data are presented.
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