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However, as an understudied pathogen there are knowledge gaps in relation to its population biology, phenotypic traits and useful model strains. A phylogenomic study of \n \n B. multivorans<\/jats:ext-link>\n <\/jats:named-content>\n <\/jats:italic> was undertaken using a total of 283 genomes, of which 73 were sequenced and 49 phenotypically characterized as part of this study. Average nucleotide identity analysis (ANI) and phylogenetic alignment of core genes demonstrated that the \n \n B. multivorans<\/jats:ext-link>\n <\/jats:named-content>\n <\/jats:italic> population separated into two distinct evolutionary clades, defined as lineage 1 (n<\/jats:italic>=58 genomes) and lineage 2 (n<\/jats:italic>=221 genomes). To examine the population biology of \n \n B. multivorans<\/jats:ext-link>\n <\/jats:named-content>\n <\/jats:italic>, a representative subgroup of 77 \n \n B. multivorans<\/jats:ext-link>\n <\/jats:named-content>\n <\/jats:italic> genomes (28 from the reference databases and the 49 novel short-read genome sequences) were selected based on multilocus sequence typing (MLST), isolation source and phylogenetic placement criteria. Comparative genomics was used to identify \n \n B. multivorans<\/jats:ext-link>\n <\/jats:named-content>\n <\/jats:italic> lineage-specific genes \u2013 ghrB_1<\/jats:italic> in lineage 1 and glnM_2<\/jats:italic> in lineage 2 \u2013 and diagnostic PCRs targeting them were successfully developed. Phenotypic analysis of 49 representative \n \n B. multivorans<\/jats:ext-link>\n <\/jats:named-content>\n <\/jats:italic> strains showed considerable inter-strain variance, but the majority of the isolates tested were motile and capable of biofilm formation. A striking absence of \n \n B. multivorans<\/jats:ext-link>\n <\/jats:named-content>\n <\/jats:italic> protease activity in vitro<\/jats:italic> was observed, but no lineage-specific phenotypic differences were demonstrated. Using phylogenomic and phenotypic criteria, three model \n \n B. multivorans<\/jats:ext-link>\n <\/jats:named-content>\n <\/jats:italic> CF strains were identified, BCC0084 (lineage 1), BCC1272 (lineage 2a) and BCC0033 lineage 2b, and their complete genome sequences determined. \n \n B. multivorans<\/jats:ext-link>\n <\/jats:named-content>\n <\/jats:italic> CF strains BCC0033 and BCC0084, and the environmental reference strain, ATCC 17616, were all capable of short-term survival within a murine lung infection model. By mapping the population biology, identifying lineage-specific PCRs and model strains, we provide much needed baseline resources for future studies of \n \n B. multivorans<\/jats:ext-link>\n <\/jats:named-content>\n <\/jats:italic>.<\/jats:p>","DOI":"10.1099\/mic.0.001366","type":"journal-article","created":{"date-parts":[[2023,8,1]],"date-time":"2023-08-01T16:16:47Z","timestamp":1690906607000},"source":"Crossref","is-referenced-by-count":4,"title":["Identification of two distinct phylogenomic lineages and model strains for the understudied cystic fibrosis lung pathogen Burkholderia multivorans"],"prefix":"10.1099","volume":"169","author":[{"given":"Kasia M.","family":"Parfitt","sequence":"first","affiliation":[{"name":"Present address: Department of Biology, Big Data Institute, Nuffield Department of Population Health, Li Ka Shing Centre for Health Information and Discovery, Old Road Campus, University of Oxford, Oxford OX3 7LF, UK"},{"name":"Cardiff University, Microbiomes, Microbes 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