Molecular Biology and Evolution, Vol 12, 198-207, Copyright © 1995 by Society for Molecular Biology and Evolution
T Naas, M Blot, WM Fitch and W Arber
An analysis of restriction fragment length polymorphism (RFLP) using eight
residential insertion sequence (IS) elements as hybridization probes
reveals that the genome of resting bacteria is more dynamic than it was
long believed. Escherichia coli strains stored in agar stabs for up to 30
yr accumulate a genetic variation which is correlated to time of storage.
This spontaneous mutagenesis is often IS-specific, with particularly high
activity for IS5, and thus suggests that transpositional DNA rearrangements
are a major cause for the observed genetic polymorphism. The RFLP patterns
indicate a burst of IS30 transposition to occur occasionally. Mutation rate
is estimated by two different methods to roughly 10(-5) IS-related DNA
rearrangements per bacterial chromosome per hour of storage for the eight
IS elements studied. A pedigree derived from the RFLP data reveals that
populations had evolved independently in each stab and showed no signs of
convergence. Relics of an assumed ancestral population were still present
in the stab cultures, but the elder stabs provided mostly mutants. These
results indicate that cells placed under nutritional deprivation might have
a highly plastic genome and suggest that such plasticity might play an
adaptive role.
ORIGINAL ARTICLE
Dynamics of IS-related genetic rearrangements in resting Escherichia coli K-12
Department of Microbiology, Biozentrum of the University, Basel, Switzerland.
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