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- Title
Identification and evolution of ICE-PmuST394: a novel integrative conjugative element in Pasteurella multocida ST394.
- Authors
Chowdhury, Piklu Roy; Alhamami, Tamara; Venter, Henrietta; Veltman, Tania; Carr, Mandi; Mollinger, Joanne; Trott, Darren J; Djordjevic, Steven P
- Abstract
Background The emergence of macrolide and tetracycline resistance within Pasteurella multocida isolated from feedlot cattle and the dominance of ST394 in Australia was reported recently. Objectives To establish the genetic context of the resistance genes in P. multocida 17BRD-035, the ST394 reference genome, and conduct a molecular risk assessment of their ability to disperse laterally. Methods A bioinformatic analysis of the P. multocida 17BRD-035 genome was conducted to determine if integrative conjugative elements (ICEs) carrying resistance genes, which hamper antibiotic treatment options locally, are in circulation in Australian feedlots. Results A novel element, ICE- Pmu ST394, was characterized in P. multocida 17BRD-035. It was also identified in three other isolates (two ST394s and a ST125) in Australia and is likely present in a genome representing P. multocida ST79 from the USA. ICE- Pmu ST394 houses a resistance module carrying two variants of the bla ROB gene, bla ROB-1 and bla ROB-13, and the macrolide esterase gene, estT. The resistance gene combination on ICE- Pmu ST394 confers resistance to ampicillin and tilmicosin, but not to tulathromycin and tildipirosin. Our analysis suggests that ICE- Pmu ST394 is circulating both by clonal expansion and horizontal transfer but is currently restricted to a single feedlot in Australia. Conclusions ICE- Pmu ST394 carries a limited number of unusual antimicrobial resistance genes but has hotspots that facilitate genomic recombination. The element is therefore amenable to hosting more resistance genes, and therefore its presence (or dispersal) should be regularly monitored. The element has a unique molecular marker, which could be exploited for genomic surveillance purposes locally and globally.
- Subjects
AUSTRALIA; PASTEURELLA multocida; FEEDLOTS; BEEF cattle; DRUG resistance in microorganisms; DISEASE resistance of plants; IDENTIFICATION
- Publication
Journal of Antimicrobial Chemotherapy (JAC), 2024, Vol 79, Issue 4, p851
- ISSN
0305-7453
- Publication type
Article
- DOI
10.1093/jac/dkae040