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Shi D, Anwar TM, Pan H, Chai W, Xu S, Yue M. Genomic Determinants of Pathogenicity and Antimicrobial Resistance for 60 Global Listeria monocytogenes Isolates Responsible for Invasive Infections. Front Cell Infect Microbiol 2021; 11:718840. [PMID: 34778102 PMCID: PMC8579135 DOI: 10.3389/fcimb.2021.718840] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Accepted: 07/15/2021] [Indexed: 12/18/2022] Open
Abstract
Listeria monocytogenes remains a significant public health threat, causing invasive listeriosis manifested as septicemia, meningitis, and abortion, with up to 30% of cases having a fatal outcome. Tracking the spread of invasive listeriosis requires an updated knowledge for virulence factors (VFs) and antimicrobial resistance features, which is an essential step toward its clinical diagnosis and treatment. Taking advantage of high-throughput genomic sequencing, we proposed that the differential genes based on the pathogenomic composition could be used to evaluate clinical observations and therapeutic options for listeriosis. Here, we performed the comparative genomic analysis of 60 strains from five continents with a diverse range of sources, representing serotypes 1/2a, 1/2b, 1/2c, and 4b, comprising lineage I and lineage II and including 13 newly contributed Chinese isolates from clinical cases. These strains were associated with globally distributed clonal groups linked with confirmed foodborne listeriosis outbreak and sporadic cases. We found that L. monocytogenes strains from clonal complex (CC) CC8, CC7, CC9, and CC415 carried most of the adherence and invasive genes. Conversely, CC1, CC2, CC4, and CC6 have the least number of adherence and invasive genes. Additionally, Listeria pathogenicity island-1 (LIPI-1), LIPI-2, intracellular survival, surface anchoring, and bile salt resistance genes were detected in all isolates. Importantly, LIPI-3 genes were harbored in CC3, CC224, and ST619 of the Chinese isolates and in CC1, CC4, and CC6 of other worldwide isolates. Notably, Chinese isolates belonging to CC14 carried antibiotic resistance genes (ARGs) against β-lactams (blaTEM-101, blaTEM-105) and macrolide (ermC-15), whereas CC7 and CC8 isolates harbored ARGs against aminoglycoside (aadA10_2, aadA6_1), which may pose a threat to therapeutic efficacy. Phylogenomic analysis showed that CC8, CC7, and CC5 of Chinese isolates, CC8 (Swiss and Italian isolates), and CC5 and CC7 (Canadian isolates) are closely clustered together and belonged to the same CC. Additionally, CC381 and CC29 of Chinese isolates shared the same genomic pattern as CC26 of Swiss isolate and CC37 of Canadian isolate, respectively, indicating strong phylogenomic relation between these isolates. Collectively, this study highlights considerable clonal diversity with well-recognized virulence and antimicrobial-resistant determinants among Chinese and worldwide isolates that stress to design improved strategies for clinical therapies.
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Affiliation(s)
- Dawei Shi
- Division II of In Vitro Diagnostics for Infectious Diseases, Institute for In Vitro Diagnostics Control, National Institutes for Food and Drug Control, Beijing, China
| | - Tanveer Muhammad Anwar
- Institute of Preventive Veterinary Sciences & Department of Veterinary Medicine, Zhejiang University College of Animal Sciences, Hangzhou, China
| | - Hang Pan
- Institute of Preventive Veterinary Sciences & Department of Veterinary Medicine, Zhejiang University College of Animal Sciences, Hangzhou, China
| | - Wenqin Chai
- Institute of Preventive Veterinary Sciences & Department of Veterinary Medicine, Zhejiang University College of Animal Sciences, Hangzhou, China
| | - Sihong Xu
- Division II of In Vitro Diagnostics for Infectious Diseases, Institute for In Vitro Diagnostics Control, National Institutes for Food and Drug Control, Beijing, China
| | - Min Yue
- Institute of Preventive Veterinary Sciences & Department of Veterinary Medicine, Zhejiang University College of Animal Sciences, Hangzhou, China
- Zhejiang Provincial Key Laboratory of Preventive Veterinary Medicine, Hangzhou, China
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, National Medical Center for Infectious Diseases, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
- Hainan Institute of Zhejiang University, Sanya, China
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Burall LS, Grim CJ, Datta AR. A clade of Listeria monocytogenes serotype 4b variant strains linked to recent listeriosis outbreaks associated with produce from a defined geographic region in the US. PLoS One 2017; 12:e0176912. [PMID: 28464038 PMCID: PMC5413027 DOI: 10.1371/journal.pone.0176912] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2017] [Accepted: 04/19/2017] [Indexed: 11/19/2022] Open
Abstract
Four listeriosis incidences/outbreaks, spanning 19 months, have been linked to Listeria monocytogenes serotype 4b variant (4bV) strains. Three of these incidents can be linked to a defined geographical region, while the fourth is likely to be linked. In this study, whole genome sequencing (WGS) of strains from these incidents was used for genomic comparisons using two approached. The first was JSpecies tetramer, which analyzed tetranucleotide frequency to assess relatedness. The second, the CFSAN SNP Pipeline, was used to perform WGS SNP analyses against three different reference genomes to evaluate relatedness by SNP distances. In each case, unrelated strains were included as controls. The analyses showed that strains from these incidents form a highly related clade with SNP differences of ≤101 within the clade and >9000 against other strains. Multi-Virulence-Locus Sequence Typing, a third standardized approach for evaluation relatedness, was used to assess the genetic drift in six conserved, known virulence loci and showed a different clustering pattern indicating possible differences in selection pressure experienced by these genes. These data suggest a high degree of relatedness among these 4bV strains linked to a defined geographic region and also highlight the possibility of alterations related to adaptation and virulence.
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Affiliation(s)
- Laurel S. Burall
- Center for Food Safety and Applied Nutrition, Food and Drug Administration Laurel, Maryland, United States of America
- * E-mail: (LSB); (ARD)
| | - Christopher J. Grim
- Center for Food Safety and Applied Nutrition, Food and Drug Administration Laurel, Maryland, United States of America
| | - Atin R. Datta
- Center for Food Safety and Applied Nutrition, Food and Drug Administration Laurel, Maryland, United States of America
- * E-mail: (LSB); (ARD)
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Pauletto M, Carraro L, Babbucci M, Lucchini R, Bargelloni L, Cardazzo B. Extending RAD tag analysis to microbial ecology: a comparison between MultiLocus Sequence Typing and 2b-RAD to investigate Listeria monocytogenes genetic structure. Mol Ecol Resour 2015; 16:823-35. [PMID: 26613186 DOI: 10.1111/1755-0998.12495] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Revised: 10/14/2015] [Accepted: 11/23/2015] [Indexed: 12/24/2022]
Abstract
The advent of next-generation sequencing (NGS) has dramatically changed bacterial typing technologies, increasing our ability to differentiate bacterial isolates. Despite it is now possible to sequence a bacterial genome in a few days and at reasonable costs, most genetic analyses do not require whole-genome sequencing, which also remains impractical for large population samples due to the cost of individual library preparation and bioinformatics. More traditional sequencing approaches, however, such as MultiLocus Sequence Typing (mlst) are quite laborious and time-consuming, especially for large-scale analyses. In this study, a genotyping approach based on restriction site-associated (RAD) tag sequencing, 2b-RAD, was applied to characterize Listeria monocytogenes strains. To verify the feasibility of the method, an in silico analysis was performed on 30 available complete genomes. For the same set of strains, in silico mlst analysis was conducted as well. Subsequently, 2b-RAD and mlst analyses were experimentally carried out on 58 isolates collected from food samples or food-processing sites. The obtained results demonstrate that 2b-RAD predicts mlst types and often provides more detailed information on population structure than mlst. Moreover, the majority of variants differentiating identical sequence type isolates mapped against accessory fragments, thus providing additional information to characterize strains. Although mlst still represents a reliable typing method, large-scale studies on molecular epidemiology and public health, as well as bacterial phylogenetics, population genetics and biosafety could benefit of a low cost and fast turnaround time approach such as the 2b-RAD analysis proposed here.
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Affiliation(s)
- Marianna Pauletto
- Department of Comparative Biomedicine and Food Science, University of Padova, Viale dell'Università 16, 35020, Legnaro, Italy
| | - Lisa Carraro
- Department of Comparative Biomedicine and Food Science, University of Padova, Viale dell'Università 16, 35020, Legnaro, Italy
| | - Massimiliano Babbucci
- Department of Comparative Biomedicine and Food Science, University of Padova, Viale dell'Università 16, 35020, Legnaro, Italy
| | - Rosaria Lucchini
- Istituto Zooprofilattico delle Venezie, Viale dell'Università 10, 35020, Legnaro, Italy
| | - Luca Bargelloni
- Department of Comparative Biomedicine and Food Science, University of Padova, Viale dell'Università 16, 35020, Legnaro, Italy
| | - Barbara Cardazzo
- Department of Comparative Biomedicine and Food Science, University of Padova, Viale dell'Università 16, 35020, Legnaro, Italy
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Geographical and longitudinal analysis of Listeria monocytogenes genetic diversity reveals its correlation with virulence and unique evolution. Microbiol Res 2015; 175:84-92. [PMID: 25912377 DOI: 10.1016/j.micres.2015.04.002] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2015] [Revised: 03/30/2015] [Accepted: 04/03/2015] [Indexed: 11/23/2022]
Abstract
Listeria monocytogenes is one of the most important foodborne pathogens causing severe diseases with a mortality rate of 24%. However, the genetic diversity and evolution of L. monocytogenes, particularly at the worldwide level, are poorly defined. In this study, we performed multilocus sequence typing (MLST) and multi virulence locus sequence typing (MVLST) for 86 L. monocytogenes strains derived from 8 countries from 1926 to 2012 in order to better understand the molecular evolution and genetic characteristics of this pathogen. A total of 13 clonal complexes (CCs) were detected, of which CC1, CC2, CC3, CC7, CC9, CC4 are the most prevalent. Notably, polymorphism of housekeeping genes of isolates belong to CC1 (STs = 47) increased more rapidly over the time. MLST-based phylogenetic analysis showed that serotype 1/2b and 4b strains had an "interval-type" evolution pattern, while serotype 1/2a and 1/2c strains had a "progressive-type" evolution pattern. Furthermore, strains from temporally and geographically unrelated outbreaks in different countries were clustered in the same subgroup of phylogenetic tree, indicating that that L. monocytogenes developed highly similar virulence genes and genetic characteristics to adaptation in a special ecological niche. Interestingly, there was a high correlation between the population structure of MVLST and MLST among the isolates of cluster IA corresponding to CC1, CC2, CC4 and CC6 that had the highest potential to cause listeriosis outbreaks, strengthening that surveillance of these CCs is important for prevention of listeriosis. The present study offers insights into the internal relationships between the population structure, distribution and pathogenicity of L. monocytogenes.
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Feasibility of mini-sequencing schemes based on nucleotide polymorphisms for microbial identification and population analyses. Appl Microbiol Biotechnol 2015; 99:2513-21. [DOI: 10.1007/s00253-015-6427-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2014] [Revised: 01/20/2015] [Accepted: 01/21/2015] [Indexed: 11/26/2022]
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Lomonaco S, Furumoto EJ, Loquasto JR, Morra P, Grassi A, Roberts RF. Development of a rapid SNP-typing assay to differentiate Bifidobacterium animalis ssp. lactis strains used in probiotic-supplemented dairy products. J Dairy Sci 2015; 98:804-12. [DOI: 10.3168/jds.2014-8509] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2014] [Accepted: 11/18/2014] [Indexed: 12/19/2022]
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Oliveira M, Lackner M, Amorim A, Araujo R. Feasibility of mitochondrial single nucleotide polymorphisms to detect and identify Aspergillus fumigatus in clinical samples. Diagn Microbiol Infect Dis 2014; 80:53-8. [DOI: 10.1016/j.diagmicrobio.2014.05.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2013] [Revised: 05/05/2014] [Accepted: 05/10/2014] [Indexed: 01/02/2023]
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Soares I, Araujo R. MLST@SNaP: user-friendly software for simplification of multilocus sequence typing and dissemination of microbial population analyses. Methods Ecol Evol 2014. [DOI: 10.1111/2041-210x.12170] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- Inês Soares
- IPATIMUP; Institute of Molecular Pathology and Immunology of the University of Porto; Rua Dr. Roberto Frias s/n Porto 4200-465 Portugal
- Faculty of Sciences; University of Porto; Rua do Campo Alegre s/n Porto 4169-007 Portugal
- Center of Mathematics of the University of Porto; Rua do Campo Alegre s/n Porto 4169-007 Portugal
| | - Ricardo Araujo
- IPATIMUP; Institute of Molecular Pathology and Immunology of the University of Porto; Rua Dr. Roberto Frias s/n Porto 4200-465 Portugal
- Faculty of Sciences; University of Porto; Rua do Campo Alegre s/n Porto 4169-007 Portugal
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10
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Liu D. Molecular approaches to the identification of pathogenic and nonpathogenic listeriae. Microbiol Insights 2013; 6:59-69. [PMID: 24826075 PMCID: PMC3987759 DOI: 10.4137/mbi.s10880] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
The genus Listeria consists of a closely related group of Gram-positive bacteria that commonly occur in the environment and demonstrate varied pathogenic potential. Of the 10 species identified to date, L. monocytogenes is a facultative intracellular pathogen of both humans and animals, L. ivanovii mainly infects ungulates (eg., sheep and cattle), while other species (L. innocua, L. seeligeri, L. welshimeri, L. grayi, L. marthii, L. rocourtiae, L. fleischmannii and L. weihenstephanensis) are essentially saprophytes. Within the species of L. monocytogenes, several serovars (e.g., 4b, 1/2a, 1/2b and 1/2c) are highly pathogenic and account for a majority of clinical isolations. Due to their close morphological, biological, biochemical and genetic similarities, laboratory identification of pathogenic and nonpathogenic Listeria organisms is technically challenging. With the development and application of various molecular approaches, accurate and rapid discrimination of pathogenic and nonpathogenic Listeria organisms, as well as pathogenic and nonpathogenic L. monocytogenes strains, has become possible.
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Affiliation(s)
- Dongyou Liu
- Royal College of Pathologists of Australasia Biosecurity Quality Assurance Programs, NSW, Australia
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11
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SNaPaer: a practical single nucleotide polymorphism multiplex assay for genotyping of Pseudomonas aeruginosa. PLoS One 2013; 8:e66083. [PMID: 23776608 PMCID: PMC3680407 DOI: 10.1371/journal.pone.0066083] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2012] [Accepted: 05/07/2013] [Indexed: 12/21/2022] Open
Abstract
Multilocus sequence typing (MLST) represents the gold standard genotyping method in studies concerning microbial population structure, being particularly helpful in the detection of clonal relatedness. However, its applicability on large-scale genotyping is limited due to the high cost and time spent on the task. The selection of the most informative nucleotide positions simplifies genomic characterization of bacteria. A simple and informative multiplex, SNaPaer assay, was developed and genotyping of Pseudomonas aeruginosa was obtained after a single reaction of multiplex PCR amplification and mini-sequencing. This cost-effective technique allowed the analysis of a Portuguese set of isolates (n = 111) collected from three distinct hospitals and the genotyping data could be obtained in less than six hours. Point mutations were shown to be the most frequent event responsible for diversification of the Portuguese population sample. The Portuguese isolates corroborated the epidemic hypothesis for P. aeruginosa population. SNaPaer genotyping assay provided a discriminatory power of 0.9993 for P. aeruginosa, by testing in silico several hundreds of MLST profiles available online. The newly proposed assay targets less than 0.01% of the total MLST length and guarantees reproducibility, unambiguous analysis and the possibility of comparing and transferring data between different laboratories. The plasticity of the method still supports the addition of extra molecular markers targeting specific purposes/populations. SNaPaer can be of great value to clinical laboratories by facilitating routine genotyping of P. aeruginosa.
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Rocha PRD, Lomonaco S, Bottero MT, Dalmasso A, Dondo A, Grattarola C, Zuccon F, Iulini B, Knabel SJ, Capucchio MT, Casalone C. Ruminant rhombencephalitis-associated Listeria monocytogenes strains constitute a genetically homogeneous group related to human outbreak strains. Appl Environ Microbiol 2013; 79:3059-66. [PMID: 23455337 PMCID: PMC3623162 DOI: 10.1128/aem.00219-13] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2013] [Accepted: 02/22/2013] [Indexed: 01/01/2023] Open
Abstract
Listeriosis is a disease that causes significant economic losses at the farm level because of high morbidity and mortality in ruminants. This study was performed to investigate the role of ruminants in the epidemiology of listeriosis in northern Italy and the possible association of animal-adapted strains of Listeria monocytogenes with strains associated with human disease. Twenty ruminant rhombencephalitis isolates previously confirmed as L. monocytogenes by bacteriology and PCR were characterized by serotyping, pulsed-field gel electrophoresis, multi-virulence-locus sequence typing (MVLST), and multiplex single nucleotide polymorphism (mSNP) typing for the detection of epidemic clones. Subtyping results were subsequently compared with those obtained from human, food, and environmental isolates of L. monocytogenes, including 311 isolates from the University of Turin, Grugliasco, Italy, and 165 isolates representing major human listeriosis outbreaks worldwide, in addition to other unrelated isolates. Both mSNP typing and MVLST showed that 60% of the isolates analyzed belonged to epidemic clone I (ECI), which has been epidemiologically linked to several human outbreaks of listeriosis. In particular, the 1981 Canada outbreak was linked to the use of sheep manure and the 1985 California outbreak was linked to the use of raw cow's milk. In our study, ECI isolates were collected from different ruminant species on geographically and temporally distinct occasions for the last 13 years. Our results support the hypothesis that ruminants represent possible natural reservoirs of L. monocytogenes strains capable of causing epidemics of listeriosis in humans.
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Affiliation(s)
| | - Sara Lomonaco
- Department of Veterinary Sciences, University of Turin, Grugliasco, Italy
| | | | | | - Alessandro Dondo
- Istituto Zooprofilattico Sperimentale di Piemonte, Liguria e Valle d'Aosta, Turin, Italy
| | - Carla Grattarola
- Istituto Zooprofilattico Sperimentale di Piemonte, Liguria e Valle d'Aosta, Turin, Italy
| | - Fabio Zuccon
- Istituto Zooprofilattico Sperimentale di Piemonte, Liguria e Valle d'Aosta, Turin, Italy
| | - Barbara Iulini
- Istituto Zooprofilattico Sperimentale di Piemonte, Liguria e Valle d'Aosta, Turin, Italy
| | - Stephen John Knabel
- Department of Food Science, Penn State University, University Park, Pennsylvania, USA
| | | | - Cristina Casalone
- Istituto Zooprofilattico Sperimentale di Piemonte, Liguria e Valle d'Aosta, Turin, Italy
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Mammina C, Parisi A, Guaita A, Aleo A, Bonura C, Nastasi A, Pontello M. Enhanced surveillance of invasive listeriosis in the Lombardy region, Italy, in the years 2006-2010 reveals major clones and an increase in serotype 1/2a. BMC Infect Dis 2013; 13:152. [PMID: 23530941 PMCID: PMC3616957 DOI: 10.1186/1471-2334-13-152] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2012] [Accepted: 03/20/2013] [Indexed: 01/07/2023] Open
Abstract
BACKGROUND Invasive listeriosis is a rare, life-threatening foodborne disease. Lombardy, an Italian region accounting for 16% of the total population, reported 55% of all listeriosis cases in the years 2006-2010. The aim of our study was to provide a snapshot of listeriosis epidemiology in this region after the implementation of a voluntary laboratory-based surveillance system. METHODS We characterized by serotyping, pulsed-field gel electrophoresis, multilocus sequence typing and detection of epidemic clone markers, 134 isolates from 132 listeriosis cases, including 15 pregnancy-related cases, occurring in the years 2006-2010 in Lombardy. Demographic and clinical characteristics of cases have also been described. RESULTS The mean age of non pregnancy-associated cases was 64.7 years, with 55.9% of cases being older than 65 years. Cases having no underlying medical conditions accounted for 11.6%. The all-cause fatality rate of 83 cases with a known survival outcome was 25.3%.Serotypes 1/2a and 4b comprised 52.2% and 38.8% of isolates, respectively. Seventy-three AscI pulsotypes and 25 sequence types assigned to 23 clonal complexes were recognized. Moreover, 53 (39.5%) isolates tested positive for the epidemic clone markers. Twelve molecular subtype clusters including at least three isolates were detected, with cluster 11 (1/2a/ST38) including 31 isolates identified during the entire study period. No outbreaks were notified to public health authorities during this period. CONCLUSIONS The findings of our study proved that epidemiology of listeriosis in Lombardy is characterized by a high prevalence of major clones and the increasing role of serotype 1/2a. Molecular subtyping is an essential tool in the epidemiology and surveillance of listeriosis. Rapid molecular cluster detection could alert about putative outbreaks, thus increasing the chance of detecting and inactivating routes of transmission.
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Affiliation(s)
- Caterina Mammina
- Department of Sciences for Health Promotion “G. D’Alessandro”, University of Palermo, Palermo, Italy
| | - Antonio Parisi
- Experimental Zooprophylactic Institute of Apulia and Basilicata, Foggia, Italy
| | - Anna Guaita
- Department of Sciences for Health, University of Milan, Milan, Italy
| | - Aurora Aleo
- Department of Sciences for Health Promotion “G. D’Alessandro”, University of Palermo, Palermo, Italy
| | - Celestino Bonura
- Department of Sciences for Health Promotion “G. D’Alessandro”, University of Palermo, Palermo, Italy
| | - Antonino Nastasi
- Department of Public Health, University of Florence, Florence, Italy
| | - Mirella Pontello
- Department of Sciences for Health, University of Milan, Milan, Italy
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Shen J, Rump L, Zhang Y, Chen Y, Wang X, Meng J. Molecular subtyping and virulence gene analysis of Listeria monocytogenes isolates from food. Food Microbiol 2013; 35:58-64. [PMID: 23628615 DOI: 10.1016/j.fm.2013.02.014] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2012] [Revised: 02/03/2013] [Accepted: 02/26/2013] [Indexed: 11/18/2022]
Abstract
A total of 67 Listeria monocytogenes isolates from 698 raw meat samples were characterized for molecular serogroup identification and antimicrobial susceptibility. Approximately one third (32.8%) of the isolates belonged to molecular serogroup 1/2a, 3a, followed by 1/2c, 3c (26.9%), 1/2b, 3b, 7 (22.4%), 4b, 4d, 4e (16.4%) and 4a, 4c (1.5%). Most of the L. monocytogenes isolates were susceptible to 14 antimicrobials tested but several were resistant to tetracycline, ciprofloxacin and nitrofurantoin. An additional 30 L. monocytogenes isolates from chicken and produce in our collection were also included to determine the presence of significant virulence markers. All 97 isolates carried inlC and inlJ except for a lineage III isolate 110-1. Most Listeriolysin S (LLS)-carrying isolates (11/12) belonged to lineage I, whereas the remaining one isolate belonged to lineage III. Five 4b, 4d, 4e isolates including two from turkey and three from produce belonged to Epidemic Clone I (ECI). Four molecular serogroup associated mutation types that lead to premature stop codons (PMSCs) in inlA were identified. PFGE and inlA sequence analysis results were concordant, and different virulence potential within 1/2a, 3a and 4b, 4d, 4e isolates were observed. The study revealed that a subset of isolates from meat and produce belonged to ECI, harbored inlC, inlJ and LLS, and produced full length InlA, suggesting that they be capable of causing human illness.
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Affiliation(s)
- Jinling Shen
- College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi Province 712100, China
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Lomonaco S, Patti R, Knabel SJ, Civera T. Detection of virulence-associated genes and epidemic clone markers in Listeria monocytogenes isolates from PDO Gorgonzola cheese. Int J Food Microbiol 2012; 160:76-9. [DOI: 10.1016/j.ijfoodmicro.2012.09.011] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2012] [Revised: 09/11/2012] [Accepted: 09/17/2012] [Indexed: 11/30/2022]
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