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Peruzy MF, Murru N, Perugini AG, Capuano F, Delibato E, Mercogliano R, Korkeala H, Proroga YTR. Evaluation of virulence genes in Yersinia enterocolitica strains using SYBR Green real-time PCR. Food Microbiol 2017; 65:231-235. [PMID: 28400007 DOI: 10.1016/j.fm.2017.03.004] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2016] [Revised: 01/20/2017] [Accepted: 03/03/2017] [Indexed: 11/25/2022]
Abstract
Yersinia enterocolitica comprises six biotypes 1A, 1B, 2, 3, 4, and 5. The virulence of the strains belonging to biotypes 1B and 2-5 depends on the presence of both chromosomal and plasmid-borne genes. Strains belonging to biotype 1A do not carry the virulence plasmid pYV. However, they carry other virulence genes, such as ystB and hreP. The aim of this study was to investigate the distribution of yadA, virF, inv, ystA, ystB, myfA, hreP and ymoA virulence genes in Y. enterocolitica strains in order to select the target genes that could be used for the development of a probe-specific real-time PCR to determine the presence of Y. enterocolitica in food samples. A total of 161 Y. enterocolitica strains isolated in eight countries and grouped into biotypes 1A, 2 (serotypes O3, O5 and O9), 3 (serotypes O3 and O9) and 4 (serotype O3) were examined for virulence genes. The most common virulence-associated gene in pathogenic Y. enterocolitica proved to be ystA, which can therefore be considered the best target gene to be amplified in order to evaluate the presence of pathogenic biotypes. By contrast, to identify Y. enterocolitica 1A strains, ystB, which codes for the enterotoxin YstB, can be proposed. This has been found in all non-pathogenic biotypes studied, but never in pathogenic biotypes.
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Affiliation(s)
- Maria Francesca Peruzy
- Department of Veterinary Medicine and Animal Production, University of Naples "Federico II", Via Delpino 1, 80137 Napoli, Italy
| | - Nicoletta Murru
- Department of Veterinary Medicine and Animal Production, University of Naples "Federico II", Via Delpino 1, 80137 Napoli, Italy
| | - Anna Giannina Perugini
- Department of Food Microbiology, Istituto Zooprofilattico Sperimentale del Mezzogiorno, Via Salute, 2, 80055 Portici, NA, Italy
| | - Federico Capuano
- Department of Food Microbiology, Istituto Zooprofilattico Sperimentale del Mezzogiorno, Via Salute, 2, 80055 Portici, NA, Italy
| | - Elisabetta Delibato
- Department of Veterinary Public Health and Food Safety, Istituto Superiore di Sanità, Viale Regina Elena, 299-00161 Rome, Italy
| | - Raffaelina Mercogliano
- Department of Veterinary Medicine and Animal Production, University of Naples "Federico II", Via Delpino 1, 80137 Napoli, Italy
| | - Hannu Korkeala
- Department of Food Hygiene and Environmental Health, University of Helsinki, P.O. Box 66, 00014 Helsinki, Finland
| | - Yolande Therese Rose Proroga
- Department of Food Microbiology, Istituto Zooprofilattico Sperimentale del Mezzogiorno, Via Salute, 2, 80055 Portici, NA, Italy.
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