https://www.selleckchem.com/pr....oducts/CP-690550.htm
Evolving plasmids under different selection regimes in Escherichia coli, we find that antibiotics led to plasmid amplification, resulting in plasmid instability. Thus, under positive selection, suboptimal solutions for plasmid stability were maintained in the population hindering long-term plasmid persistence. Indeed, a survey of Escherichia plasmids confirms that antibiotic resistance genes are rarely found on small plasmids. Our results show that a plasmid-mediated advantage for the host may manifest in reduced plasmid evolutionary
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