Abstract
Mobile genetic elements (MGEs) including plasmids have an important role in the rapid evolution and adaptation of bacteria. Here, the behavior of MGEs in different environments is reviewed, in particular, behavior of the plasmid pCAR1, a carbazole-degradative plasmid isolated from Pseudomonas resinovorans CA10. pCAR1 belongs to incompatibility P-7 group and is self-transmissible among different bacteria. Comparisons of changes in the transcriptome of different host strains caused by carrying pCAR1 revealed common responses in the hosts and host-specific responses. Monitoring the survival of the host and transfer of the plasmid in artificial and natural environmental samples revealed several environmental factors, including cations and water content, which changed the behavior of both the host and its plasmid. Single-cell level analysis to detect the transconjugants of different plasmids successfully determined the transfer range of the plasmids. Three nucleoid-associated proteins encoded on pCAR1 are important factors affecting its genetic stability, maintenance, and transfer.
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