Molecular Evolution of the Escherichia Coli Chromosome. II. Clonal Segments

Overview

Journal Genetics

Publisher Oxford University Press

Specialty Genetics

Date 1988 Oct 1

PMID 3058547

Citations 19

Authors

R Milkman

A Stoltzfus

Affiliations

Soon will be listed here.

Abstract

Remarkable sequence similarities in the trp region among Escherichia coli strains of diverse natural origins imply the existence of worldwide clones of very recent origin. This in turn implies a low rate of fixation of new universally favorable alleles, which carry adjacent stretches of chromosome to high frequency. These clonal segments begin as entire chromosomes; recombination shortens them progressively by substituting less closely related homologous DNA. The rate of this recombination, comprising the introduction of a homologous chromosomal fragment to a cell and the replacement of part of the original chromosome, is estimated from observations.

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