Whole-genome sequencing-based characterization of Listeria monocytogenes isolated from cattle and pig slaughterhouses

IF 2.6 4区医学 Q3 INFECTIOUS DISEASES Infection Genetics and Evolution Pub Date : 2025-03-09 DOI:10.1016/j.meegid.2025.105737

Serim Hong , Jin-San Moon , Young Ju Lee , Ha-Young Kim

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Abstract

Listeria monocytogenes is a foodborne pathogen that causes human listeriosis and may be transmitted to humans via the food chain, beginning at slaughter and extending through food production and consumption. In this study, we performed whole-genome sequencing (WGS) analysis to determine the genetic characteristics of L. monocytogenes from the carcasses and environments of cattle and pig slaughterhouses in Korea. In total, 50 L. monocytogenes isolates were collected from 46 cattle and 47 pig slaughterhouses nationwide from 2014 to 2022. They were classified into two lineages, 12 sublineages, 12 sequence types, 11 clonal complexes (CCs), and 15 core-genome multilocus sequence types. L. monocytogenes isolates were divided into two lineages: lineage I (serotypes 1/2b and 4b) and lineage II (serotypes 1/2a and 1/2c). The most frequent CCs were CC9 (46.0 %), followed by CC224 (16.0 %) and CC155 (14.0 %). Although all isolates exhibited highly conserved LIPI-1, 20.0 % and 2.0 % contained LIPI-3 or LIPI-4, respectively. Moreover, 96.0 % of the isolates had full-length inlA. Interestingly, 21 of the 23 CC9 isolates contained mutations in inlA resulting from premature stop codon (PMSC). The mdrL and Listeria genomic island-2 (LGI-2) were identified in all L. monocytogenes isolates, whereas LGI-3 was identified in 32.0 % of the isolates. The L. monocytogenes isolates contained various antimicrobial resistance genes, moreover, the plasmid-borne resistance genes tetM and mprF were also identified in 34.0 % and 100 % of the isolates, respectively. Twenty-four isolates (48.0 %) harbored one or two plasmids (pLM33, DOp1, pLGUG1, and pLM5578), and 29 isolates (58.0 %) harbored at least one insertion sequence, composite transposon, and integrative conjugative element. Four isolates showed two CRISPR-Cas types IB and II-A. In addition, phage sequences associated with the spacer constituting the CRISPR array were identified in 26 Listeria phages from 14 L. monocytogenes isolates. The genetic composition of L. monocytogenes was conserved in a collinearity relationship between each of the five L. monocytogenes isolates from the cattle and pig slaughterhouses. These findings suggest that L. monocytogenes isolated from cattle and pig slaughterhouses have the ability to cause human disease and exhibit virulent characteristics.

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来源期刊

Infection Genetics and Evolution 医学-传染病学

CiteScore

8.40

自引率

0.00%

发文量

215

审稿时长

82 days

期刊介绍： (aka Journal of Molecular Epidemiology and Evolutionary Genetics of Infectious Diseases -- MEEGID) Infectious diseases constitute one of the main challenges to medical science in the coming century. The impressive development of molecular megatechnologies and of bioinformatics have greatly increased our knowledge of the evolution, transmission and pathogenicity of infectious diseases. Research has shown that host susceptibility to many infectious diseases has a genetic basis. Furthermore, much is now known on the molecular epidemiology, evolution and virulence of pathogenic agents, as well as their resistance to drugs, vaccines, and antibiotics. Equally, research on the genetics of disease vectors has greatly improved our understanding of their systematics, has increased our capacity to identify target populations for control or intervention, and has provided detailed information on the mechanisms of insecticide resistance. However, the genetics and evolutionary biology of hosts, pathogens and vectors have tended to develop as three separate fields of research. This artificial compartmentalisation is of concern due to our growing appreciation of the strong co-evolutionary interactions among hosts, pathogens and vectors. Infection, Genetics and Evolution and its companion congress [MEEGID](http://www.meegidconference.com/) (for Molecular Epidemiology and Evolutionary Genetics of Infectious Diseases) are the main forum acting for the cross-fertilization between evolutionary science and biomedical research on infectious diseases. Infection, Genetics and Evolution is the only journal that welcomes articles dealing with the genetics and evolutionary biology of hosts, pathogens and vectors, and coevolution processes among them in relation to infection and disease manifestation. All infectious models enter the scope of the journal, including pathogens of humans, animals and plants, either parasites, fungi, bacteria, viruses or prions. The journal welcomes articles dealing with genetics, population genetics, genomics, postgenomics, gene expression, evolutionary biology, population dynamics, mathematical modeling and bioinformatics. We also provide many author benefits, such as free PDFs, a liberal copyright policy, special discounts on Elsevier publications and much more. Please click here for more information on our author services .