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Genomic dissection of the most prevalent Listeria monocytogenes clone, sequence type ST87, in China
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Genomic dissection of the most prevalent Listeria monocytogenes clone, sequence type ST87, in China
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Journal Article
Genomic dissection of the most prevalent Listeria monocytogenes clone, sequence type ST87, in China
2019
Overview
Background
Listeria monocytogenes
consists of four lineages that occupy a wide variety of ecological niches. Sequence type (ST) 87 (serotype 1/2b), belonging to lineage I, is one of the most common STs isolated from food products, food associated environments and sporadic listeriosis in China. Here, we performed a comparative genomic analysis of the
L. monocytogenes
ST87 clone by sequencing 71 strains representing a diverse range of sources, different geographical locations and isolation years.
Results
The core genome and pan genome of ST87 contained 2667 genes and 3687 genes respectively. Phylogenetic analysis based on core genome SNPs divided the 71 strains into 10 clades. The clinical strains were distributed among multiple clades. Four clades contained strains from multiple geographic regions and showed high genetic diversity. The major gene content variation of ST87 genomes was due to putative prophages, with eleven hotspots of the genome that harbor prophages. All strains carry an intact CRISRP/Cas system. Two major CRISPR spacer profiles were found which were not clustered phylogenetically. A large plasmid of about 90 Kb, which carried heavy metal resistance genes, was found in 32.4% (23/71) of the strains. All ST87 strains harbored the
Listeria
pathogenicity island (LIPI)-4 and a unique 10-open read frame (ORF) genomic island containing a novel restriction-modification system.
Conclusion
Whole genome sequence analysis of
L. monocytogenes
ST87 enabled a clearer understanding of the population structure and the evolutionary history of ST87
L. monocytogenes
in China. The novel genetic elements identified may contribute to its virulence and adaptation to different environmental niches. Our findings will be useful for the development of effective strategies for the prevention and treatment of listeriosis caused by this prevalent clone.
Publisher
BioMed Central,BioMed Central Ltd,Springer Nature B.V,BMC
Subject
/ Biomedical and Life Sciences
/ China
/ Cloning
/ Comparative and evolutionary genomics
/ CRISPR
/ Food
/ Genes
/ Genome, Bacterial - genetics
/ Genomes
/ Genomic comparative analysis
/ Genomics
/ Listeria
/ Listeria monocytogenes - genetics
/ Listeria monocytogenes - pathogenicity
/ Listeria monocytogenes - virology
/ Microbial Genetics and Genomics
/ Niches
/ Novels
/ Polymorphism, Single Nucleotide
/ Single-nucleotide polymorphism
/ ST87
/ Surgery
