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• W2783191953 abstract "In vitro and in vivo evolution experiments on Escherichia coli revealed several principles of bacterial adaptation. However, few data are available in the literature describing the behavior of E. coli in its natural environment. We attempted here to study the evolution in the human gut of a commensal dominant E. coli clone, ED1a belonging to the B2 phylogroup, through a longitudinal genomic study. We sequenced 24 isolates sampled at three different time points within a healthy individual over almost a year. We computed a mutation rate of 6.90 × 10-7 mutations per base per year of the chromosome for E. coli ED1a in healthy human gut. We observed very limited genomic diversity and could not detect any evidence of selection, in contrast to what is observed in experimental evolution over a similar length of time. We therefore suggest that ED1a, being well adapted to the healthy human gut, evolves mostly neutrally with a low effective population size (Ne of ≈500 to 1,700).IMPORTANCE In this study, we follow the genomic fate of a dominant clone of Escherichia coli in the human gut of a healthy individual over about a year. We could compute a low annual mutation rate that supports low diversity, and we could not retrieve any clear signature of selection. These observations support a neutral evolution of E. coli in the human gut, compatible with a very limited effective population size that deviates drastically with the observations made previously in experimental evolution." @default.
• W2783191953 created "2018-01-26" @default.
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• W2783191953 date "2018-03-15" @default.
• W2783191953 modified "2023-10-13" @default.
• W2783191953 title "Evolution of a Dominant Natural Isolate of Escherichia coli in the Human Gut over the Course of a Year Suggests a Neutral Evolution with Reduced Effective Population Size" @default.
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• W2783191953 doi "https://doi.org/10.1128/aem.02377-17" @default.
• W2783191953 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5835743" @default.
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