Genomic Changes Arising in Long-Term Stab Cultures ofEscherichia coli
Open Access
- 1 October 2004
- journal article
- Published by American Society for Microbiology in Journal of Bacteriology
- Vol. 186 (19) , 6437-6442
- https://doi.org/10.1128/jb.186.19.6437-6442.2004
Abstract
Genomic scans of clones isolated from long-term stab cultures ofEscherichia coliK-12 showed the loss of two large segments of the genome, with each lost segment being approximately 20 kb long. A detailed analysis of one of the deletions, located between 5.4 and 5.9 min, revealed that similar deletions had arisen in several other stab cultures. All deletions of this type exhibited a right terminus ending precisely at an IS5Aelement and a left terminus that varied over an ∼5-kb range but was bordered in all but two cases by sequences belonging to the preferred consensus target sequence for IS5, YTAR. The ubiquity of such deletions in independent stab cultures and the increase in their frequency over time argue that they have a selective advantage. It is speculated that the loss of thecrllocus is responsible for the selective advantage of the deletions.Keywords
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