Genomic diversity of listeria monocytogenes isolated from clinical and non-clinical samples in Chile
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Fecha
2018-08
Profesor/a Guía
Facultad/escuela
Idioma
en
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MDPI AG
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Licencia CC
Licencia CC
Resumen
Listeria monocytogenes is the causative agent of listeriosis, which is an uncommon but severe infection associated with high mortality rates in humans especially in high-risk groups. This bacterium survives a variety of stress conditions (e.g., high osmolality, low pH), which allows it to colonize different niches especially niches found in food processing environments. Additionally, a considerable heterogeneity in pathogenic potential has been observed in different strains. In this study, 38 isolates of L. monocytogenes collected in Chile from clinical samples (n = 22) and non-clinical samples (n = 16) were analyzed using whole genome sequencing (WGS) to determine their genomic diversity. A core genome Single Nucleotide Polymorphism (SNP) tree using 55 additional L. monocytogenes accessions classified the Chilean isolates in lineages I (n = 25) and II (n = 13). In silico, Multi-locus sequence typing (MLST) differentiated the isolates into 13 sequence types (ST) in which the most common were ST1 (15 isolates) and ST9 (6 isolates) and represented 55% of the isolates. Genomic elements associated with virulence (i.e., LIPI-1, LIPI-3, inlA, inlB, inlC, inlG, inlH, inlD, inlE, inlK, inlF, and inlJ) and stress survival (i.e., stress survival islet 1 and stress survival islet 2) were unevenly distributed among clinical and non-clinical isolates. In addition, one novel inlA premature stop codon (PMSC) was detected. Comparative analysis of L. monocytogenes circulating in Chile revealed the presence of globally distributed sequence types along with differences among the isolates analyzed at a genomic level specifically associated with virulence and stress survival. © 2018 by the authors. Licensee MDPI, Basel, Switzerland.
Notas
Indexación: Scopus.
Funding: The study was funded by the Universidad Andres Bello Grant no. DI-638-15/I to V.T.
Funding: The study was funded by the Universidad Andres Bello Grant no. DI-638-15/I to V.T.
Palabras clave
Chile, Genomic diversity, Listeria monocytogenes, Single nucleotide polymorphism, Whole genome sequencing
Citación
Genes, 9(8), art. no. 396.