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Prokaryotes

Genome Sequence of Listeria monocytogenes Plasmid pLM-C-273 Carrying Genes Related to Stress Resistance

Lindsay Liang, Saravanamuttu Gnaneshan, Rafael A. Garduño, Gustavo V. Mallo
Lindsay Liang
Public Health Ontario, Toronto, Canada
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Saravanamuttu Gnaneshan
Public Health Ontario, Toronto, CanadaDepartment of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Canada
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Rafael A. Garduño
Canadian Food Inspection Agency, Dartmouth Laboratory, Dartmouth, Canada
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Gustavo V. Mallo
Public Health Ontario, Toronto, CanadaDepartment of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Canada
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DOI: 10.1128/genomeA.01125-16
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ABSTRACT

Mobile genetic elements in bacteria, such as plasmids, act as important vectors for the transfer of antibiotic resistance, virulence, and metal resistance genes. Here, we report the genome sequence of a new plasmid pLM-C-273, identified in a Listeria monocytogenes strain isolated from a clinical sample in Ontario, Canada.

GENOME ANNOUNCEMENT

Listeria monocytogenes is highly resistant to environmental stresses that usually limit bacterial growth, such as low temperatures, fluctuations in pH, high salt concentrations, and metal ions (1), making its eradication from food manufacturing plants difficult. In general, plasmids have been implicated as genetic vectors in the interbacterial transfer of antibiotic resistance (2), virulence factors (3), and metal ion resistance factors (4). Here, we report the nucleotide sequence of L. monocytogenes plasmid pLM-C-273, which was derived from the whole-genome sequence of the strain LM-C-273. L. monocytogenes strain LM-C-273 is a clinical isolate recovered from a sample obtained in 2009 in Ontario, Canada, and belongs to multilocus sequence type 5 (ST5) (5).

Short-read sequences for LM-C-273 were obtained using the Illumina HiSeq 2500 technology (Illumina, San Diego, CA), and read quality was assessed using FastQC 0.1 (http://www.bioinformatics.babraham.ac.uk/projects/fastqc/). These short reads were then assembled using plasmidSpades (6), which uses the read coverage of generated contigs to distinguish between chromosomal and plasmid DNA. The assembly of plasmid contigs rendered a sequence that was 99,874 nucleotides in length in eight scaffolds, with a G+C content of 36.0%. The assembly was annotated with tools from the Victorian Bioinformatics Consortium-Prokka, using its default parameters (7). A total of 123 predicted coding sequences (CDSs) were annotated.

When the nucleotide sequence for pLM-C-273 was compared to the nonredundant nucleotide sequences database of the National Center for Biotechnology Information (NCBI), it was found that 59% of pLM-C-273's sequence matched L. monocytogenes strain N1-011A plasmid (accession no. NC_022045.1) with 99% identity. Analysis of the predicted gene products encoded in the remaining 41% of pLM-C-273's sequence that was not homologous to L. monocytogenes strain N1-011A plasmid, was done with PHAge Search Tool (PHAST) (8) and revealed several phage-related proteins. Specifically, these phage proteins seem to have originated from Listeria phage A118 (accession no. NC_003216.1), Listeria phage vB LmoS 188 (accession no. NC_028871.1), and Listeria phage A006 (accession no. NC_009815.1), suggesting a promiscuous origin for pLM-C-273. Further examination of the annotated genes in pLM-C-273 revealed a PemK interferase sequence (9), an NADH peroxidase protein reported to be responsible for hydrogen peroxide detoxification (10), a copper-transporting P-type ATPase, and a multicopper oxidase implied in copper detoxification (11), as well as a cadmium resistance operon (cadA and cadC) (12). Collectively, these findings suggest the involvement of pLM-C-273 in providing fitness advantages to strain LM-C-273, particularly related to resistance against metal ions and oxygen radicals. Analysis of L. monocytogenes plasmids can help better understand the clinical emergence of subgroups of L. monocytogenes strains with the potential to adapt more efficiently to disinfection protocols in food manufacturing plants, or to survive the food preparation process, as the results of horizontal gene transfer events.

Accession number(s).The genome sequence of pLM-C-273 plasmid has been deposited in the GenBank database under the accession numbers KX467250 to KX467259.

ACKNOWLEDGMENT

This work was supported by Public Health Ontario.

FOOTNOTES

    • Received 17 August 2016.
    • Accepted 20 August 2016.
    • Published 13 October 2016.
  • Copyright © 2016 Liang et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International license.

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Genome Sequence of Listeria monocytogenes Plasmid pLM-C-273 Carrying Genes Related to Stress Resistance
Lindsay Liang, Saravanamuttu Gnaneshan, Rafael A. Garduño, Gustavo V. Mallo
Genome Announcements Oct 2016, 4 (5) e01125-16; DOI: 10.1128/genomeA.01125-16

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Genome Sequence of Listeria monocytogenes Plasmid pLM-C-273 Carrying Genes Related to Stress Resistance
Lindsay Liang, Saravanamuttu Gnaneshan, Rafael A. Garduño, Gustavo V. Mallo
Genome Announcements Oct 2016, 4 (5) e01125-16; DOI: 10.1128/genomeA.01125-16
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