Adaptation in a Mouse Colony Monoassociated with Escherichia coli K-12 for More than 1,000 Days

Sean M. Lee, Aaron Wyse, Aaron Lesher, Mary Lou Everett, Linda Lou, Zoie E. Holzknecht, John F. Whitesides, Patricia A. Spears, Dawn E. Bowles, Shu S. Lin, Susan L. Tonkonogy, Paul E. Orndorff, R. Randal Bollinger, William Parker

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

Although mice associated with a single bacterial species have been used to provide a simple model for analysis of host-bacteria relationships, bacteria have been shown to display adaptability when grown in a variety of novel environments. In this study, changes associated with the host-bacterium relationship in mice monoassociated with Escherichia coli K-12 over a period of 1,031 days were evaluated. After 80 days, phenotypic diversification of E. coli was observed, with the colonizing bacteria having a broader distribution of growth rates in the laboratory than the parent E. coli. After 1,031 days, which included three generations of mice and an estimated 20,000 generations of E. coli, the initially homogeneous bacteria colonizing the mice had evolved to have widely different growth rates on agar, a potential decrease in tendency for spontaneous lysis in vivo, and an increased tendency for spontaneous lysis in vitro. Importantly, mice at the end of the experiment were colonized at an average density of bacteria that was more than 3-fold greater than mice colonized on day 80. Evaluation of selected isolates on day 1,031 revealed unique restriction endonuclease patterns and differences between isolates in expression of more than 10% of the proteins identified by two-dimensional electrophoresis, suggesting complex changes underlying the evolution of diversity during the experiment. These results suggest that monoassociated mice might be used as a tool for characterizing niches occupied by the intestinal flora and potentially as a method of targeting the evolution of bacteria for applications in biotechnology.

Original languageEnglish (US)
Pages (from-to)4655-4663
Number of pages9
JournalApplied and Environmental Microbiology
Volume76
Issue number14
DOIs
StatePublished - Jul 1 2010

ASJC Scopus subject areas

  • Biotechnology
  • Food Science
  • Applied Microbiology and Biotechnology
  • Ecology

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    Lee, S. M., Wyse, A., Lesher, A., Everett, M. L., Lou, L., Holzknecht, Z. E., Whitesides, J. F., Spears, P. A., Bowles, D. E., Lin, S. S., Tonkonogy, S. L., Orndorff, P. E., Randal Bollinger, R., & Parker, W. (2010). Adaptation in a Mouse Colony Monoassociated with Escherichia coli K-12 for More than 1,000 Days. Applied and Environmental Microbiology, 76(14), 4655-4663. https://doi.org/10.1128/AEM.00358-10