Abstract
In this chapter, we leverage a novel approach to assess the seamless population structure of Pseudomonas aeruginosa, using the full repertoire of genomes sequenced to date (GenBank, April 6, 2020). In order to assess the set of core functions that represents the species as well as the differences in these core functions among the phylogroups observed in the population structure analysis, we performed pangenome analyses at the species level and at the phylogroup level. The existence of the phylogroups described in the population structure analyses was supported by their different profiles of antibiotic-resistant determinants. Finally, we utilized a presence/absence matrix of protein families from the entire species to evaluate if P. aeruginosa phylogroups can be differentiated according to their accessory genomic content. Our analysis shows that the core genome of P. aeruginosa is approximately 62% of the average gene content for the species, and it is highly enriched with pathways related to the metabolism of carbohydrates and amino acids as well as cellular processes and cell maintenance. The analysis of the accessory genome of P. aeruginosa performed in this chapter confirmed not only the existence of the three phylogroups previously described in the population structure analysis, but also of 29 genetic substructures (subgroups) within the main phylogroups. Our work illustrates the utility of populations genomics pipelines to better understand highly complex bacterial species such as P. aeruginosa.
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Acknowledgments
This work was supported by the University of Arkansas for Medical Sciences (UAMS) College of Medicine Barton Pilot Grant FY19 program (AWD00052801), the UAMS Translational Research Institute (UL1 TR003107) through the NIH National Center for Advancing Translational Sciences, and the National Science Foundation under Award No. OIA-1946391. The content is solely the responsibility of the authors and does not necessarily represent the official views of the funding agencies.
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Abram, K.Z., Jun, SR., Udaondo, Z. (2022). Pseudomonas aeruginosa Pangenome: Core and Accessory Genes of a Highly Resourceful Opportunistic Pathogen. In: Filloux, A., Ramos, JL. (eds) Pseudomonas aeruginosa. Advances in Experimental Medicine and Biology, vol 1386. Springer, Cham. https://doi.org/10.1007/978-3-031-08491-1_1
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