Plasmids are genetic elements that colonize and replicate in prokaryotic cells (Box 1). They are considered a major driving force of prokaryote evolution, as they can migrate between populations, making them potent agents of lateral DNA transfer and microbial warfare. The importance of plasmids goes beyond microbial evolution, as they are widely used as vectors for genetic engineering in basic research (e.g., random mutagenesis) as well as applications in biotechnology (e.g., insulin production), synthetic biology, agriculture (e.g., genetic engineering of crops) and medicine (e.g., biopharmaceuticals).
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