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Development of a multi-locus typing scheme for an Enterobacteriaceae linear plasmid that mediates inter-species transfer of flagella

Authors :
Catherine D. Carrillo
John H. E. Nash
Gitanjali Arya
Amie Wren-Hedgus
Janet Lin
James Robertson
Source :
PLoS ONE, Vol 14, Iss 11, p e0218638 (2019), PLoS ONE
Publication Year :
2019
Publisher :
Public Library of Science (PLoS), 2019.

Abstract

Due to the public health importance of flagellar genes for typing, it is important to understand mechanisms that could alter their expression or presence. Phenotypic novelty in flagellar genes arise predominately through accumulation of mutations but horizontal transfer is known to occur. A linear plasmid termed pBSSB1 previously identified inSalmonellaTyphi, was found to encode a flagellar operon that can mediate phase variation, which results in the rare z66 flagella phenotype. The identification and tracking of homologs of pBSSB1 is limited because it falls outside the normal replicon typing schemes for plasmids. Here we report the generation of nine new pBSSB1-family sequences using Illumina and Nanopore sequence data. Homologs of pBSSB1 were identified in 154 genomes representing 25 distinct serotypes from 67,758Salmonellapublic genomes. Pangenome analysis of pBSSB1-family contigs was performed using Roary and we identified three core genes amenable to a minimal MLST scheme. Population structure analysis based on the newly developed MLST scheme identified three major lineages representing 35 sequence types, and the distribution of these sequence types was found to span multiple serovars across the globe. This MLST scheme has shown utility in tracking and subtyping pBSSB1-family plasmids and it has been incorporated into the plasmid MLST database under the name “pBSSB1-family”.

Details

ISSN :
19326203
Volume :
14
Database :
OpenAIRE
Journal :
PLOS ONE
Accession number :
edsair.doi.dedup.....edf79c03b9e24c8bfd8a69efe50f25f8