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Not all Pseudomonas aeruginosa are equal: strains from industrial sources possess uniquely large multireplicon genomes

Weiser, Rebecca ORCID:, Green, Angharad E., Bull, Matthew J., Cunningham-Oakes, Edward, Jolley, Keith A., Maiden, Martin C.J., Hall, Amanda J., Winstanley, Craig, Weightman, Andrew J. ORCID:, Donoghue, Denise, Amezquita, Alejandro, Connor, Thomas R. ORCID: and Mahenthiralingam, Eshwar ORCID: 2019. Not all Pseudomonas aeruginosa are equal: strains from industrial sources possess uniquely large multireplicon genomes. Microbial Genomics , 000276. 10.1099/mgen.0.000276

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Pseudomonas aeruginosa is a highly versatile, antibiotic-resistant Gram-negative bacterium known for causing opportunistic infections and contamination of industrial products. Despite extensive genomic analysis of clinical P. aeruginosa strains, no genomes exist for preservative-tolerant industrial strains. A unique collection of 69 industrial isolates was assembled and compared to clinical and environmental strains; 16 genetically distinct industrial strains were subjected to array tube genotyping, multilocus sequence typing and whole-genome sequencing. The industrial strains possessed high preservative tolerance and were dispersed widely across P. aeruginosa as a species, but recurrence of strains from the same lineage within specific industrial products and locations was identified. The industrial P. aeruginosa genomes (mean=7.0 Mb) were significantly larger than those of previously sequenced environmental (mean=6.5 Mb; n=19) and clinical (mean=6.6 Mb; n=66) strains. Complete sequencing of the P. aeruginosa industrial strain RW109, which encoded the largest genome (7.75 Mb), revealed a multireplicon structure including a megaplasmid (555 265 bp) and large plasmid (151 612 bp). The RW109 megaplasmid represented an emerging plasmid family conserved in seven industrial and two clinical P. aeruginosa strains, and associated with extremely stress-resilient phenotypes, including antimicrobial resistance and solvent tolerance. Here, by defining the detailed phylogenomics of P. aeruginosa industrial strains, we show that they uniquely possess multireplicon, megaplasmid-bearing genomes, and significantly greater genomic content worthy of further study.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Publisher: Microbiology Society: Microbial Genomics / Microbiology Society
ISSN: 2057-5858
Funders: Biotechnology and Biological Sciences Research Council
Date of First Compliant Deposit: 31 May 2019
Date of Acceptance: 24 May 2019
Last Modified: 24 Sep 2023 18:24

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