Presence of phage-plasmids in multiple serovars of<i>Salmonella enterica</i>
Abstract Evidence is accumulating in the literature that the horizontal spread of antimicrobial resistance (AMR) genes mediated by bacteriophages and bacteriophage-like plasmid (phage-plasmid) elements is much more common than previously envisioned. For instance, we recently identified and characterised a circular P1-like phage-plasmid harbouring ablaCTX-M-15gene conferring extended-spectrum beta-lactamase (ESBL) resistance inSalmonella entericaserovar Typhi. As the prevalence and epidemiological relevance of such mechanisms has never been systematically assessed in Enterobacterales, in this study we carried out a follow-up retrospective analysis of UKSalmonellaisolates previously sequenced as part of routine surveillance protocols between 2016 and 2021. Using a high-throughput bioinformatics pipeline we screened 47,784 isolates for the presence of the P1 lytic replication generepL, identifying 226 positive isolates from 25 serovars and demonstrating that phage-plasmid elements are more frequent than previously thought. The affinity for phage-plasmids appears highly serovar-dependent, with several serovars being more likely hosts than others; most of the positive isolates (170/226) belonged toS.Typhimurium ST34 and ST19. The phage-plasmids ranged between 85.8–98.2kb in size, with an average length of 92.1kb; detailed analysis indicated a high amount of diversity in gene content and genomic architecture. 132 phage-plasmids had the p0111 plasmid replication type, and 94 the IncY type; phylogenetic analysis indicated that both horizontal and vertical gene transmission mechanisms are likely to be involved in phage-plasmid propagation. Finally, phage-plasmids were present in isolates that were resistant and non-resistant to antimicrobials. In addition to providing a first comprehensive view of the presence of phage-plasmids inSalmonella, our work highlights the need for a better surveillance and understanding of phage-plasmids as AMR carriers, especially through their characterisation with long-read sequencing.Data Summary All of the FASTQ files examined in this study have been uploaded to the Sequence Read Archive under BioProject PRJNA248792. Accessions of individual isolates which were found to contain phage plasmids are listed in Supplementary Table S1.Impact Statement Bacteriophage-like plasmids are increasingly being recognised as important mobile elements in many species of bacteria, particularly due to their involvement in the transmission of antimicrobial resistance (AMR); however, few studies of their overall prevalence in clinical datasets have been undertaken to date. In this study we have performed the first large-scale surveillance of human disease-associatedSalmonellagenomes for the presence of P1-like phage-plasmids, showing that they are more common than previously thought. Furthermore, we highlight how valuable information about the evolution and transmission of phage-plasmids inSalmonellaand other Enterobacterales can be revealed by linking phage-plasmid prevalence and genetic diversity to epidemiologically relevant metadata such asS. entericaserovar, outbreak clusters, time, and geography. Our work shows the ability to use sequencing data and scalable bioinformatics workflows for the detection and characterisation of these extrachromosomal elements, highlights the importance of screening for novel mechanisms of AMR transmission, and provides a foundation for further surveillance studies of phage-plasmid prevalence..
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Preprint| Erscheinungsjahr: |
2024 |
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| Erschienen: |
2024 |
| Enthalten in: |
bioRxiv.org - (2024) vom: 10. Apr. Zur Gesamtaufnahme - year:2024 |
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| Sprache: |
Englisch |
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| Beteiligte Personen: |
Nair, Satheesh [VerfasserIn] |
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| Links: |
Volltext [kostenfrei] |
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| doi: |
10.1101/2024.02.02.574330 |
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| PPN (Katalog-ID): |
XBI042371074 |
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| 520 | |a Abstract Evidence is accumulating in the literature that the horizontal spread of antimicrobial resistance (AMR) genes mediated by bacteriophages and bacteriophage-like plasmid (phage-plasmid) elements is much more common than previously envisioned. For instance, we recently identified and characterised a circular P1-like phage-plasmid harbouring ablaCTX-M-15gene conferring extended-spectrum beta-lactamase (ESBL) resistance inSalmonella entericaserovar Typhi. As the prevalence and epidemiological relevance of such mechanisms has never been systematically assessed in Enterobacterales, in this study we carried out a follow-up retrospective analysis of UKSalmonellaisolates previously sequenced as part of routine surveillance protocols between 2016 and 2021. Using a high-throughput bioinformatics pipeline we screened 47,784 isolates for the presence of the P1 lytic replication generepL, identifying 226 positive isolates from 25 serovars and demonstrating that phage-plasmid elements are more frequent than previously thought. The affinity for phage-plasmids appears highly serovar-dependent, with several serovars being more likely hosts than others; most of the positive isolates (170/226) belonged toS.Typhimurium ST34 and ST19. The phage-plasmids ranged between 85.8–98.2kb in size, with an average length of 92.1kb; detailed analysis indicated a high amount of diversity in gene content and genomic architecture. 132 phage-plasmids had the p0111 plasmid replication type, and 94 the IncY type; phylogenetic analysis indicated that both horizontal and vertical gene transmission mechanisms are likely to be involved in phage-plasmid propagation. Finally, phage-plasmids were present in isolates that were resistant and non-resistant to antimicrobials. In addition to providing a first comprehensive view of the presence of phage-plasmids inSalmonella, our work highlights the need for a better surveillance and understanding of phage-plasmids as AMR carriers, especially through their characterisation with long-read sequencing.Data Summary All of the FASTQ files examined in this study have been uploaded to the Sequence Read Archive under BioProject PRJNA248792. Accessions of individual isolates which were found to contain phage plasmids are listed in Supplementary Table S1.Impact Statement Bacteriophage-like plasmids are increasingly being recognised as important mobile elements in many species of bacteria, particularly due to their involvement in the transmission of antimicrobial resistance (AMR); however, few studies of their overall prevalence in clinical datasets have been undertaken to date. In this study we have performed the first large-scale surveillance of human disease-associatedSalmonellagenomes for the presence of P1-like phage-plasmids, showing that they are more common than previously thought. Furthermore, we highlight how valuable information about the evolution and transmission of phage-plasmids inSalmonellaand other Enterobacterales can be revealed by linking phage-plasmid prevalence and genetic diversity to epidemiologically relevant metadata such asS. entericaserovar, outbreak clusters, time, and geography. Our work shows the ability to use sequencing data and scalable bioinformatics workflows for the detection and characterisation of these extrachromosomal elements, highlights the importance of screening for novel mechanisms of AMR transmission, and provides a foundation for further surveillance studies of phage-plasmid prevalence. | ||
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