Abstract
Food poisoning from consumption of food contaminated with non-typhoidal Salmonella spp. is a global problem. A modified high resolution DNA melting curve analysis (m-HRMa) was introduced to provide effective discrimination among closely related HRM curves of amplicons generated from selected Salmonella genome sequences enabled Salmonella spp. to be classified into discrete clusters. Combination of m-HRMa with serogroup identification (ms-HRMa) helped improve assignment of Salmonella spp. into clusters. In addition, a machine learning (dynamic time warping) algorithm (DTW) was employed to provide a simple and rapid protocol for clustering analysis as well as to create phylogeny tree of Salmonella strains (n = 40) collected from home, farms and slaughter houses in northern Thailand. Applications of DTW and ms-HRMa clustering analyses were capable of generating molecular signatures of the Salmonella isolates, resulting in 25 ms-HRM and 28 DTW clusters compared to 14 clusters from a standard HRM analysis, and the combination of both analyses permitted molecular subtyping of each Salmonella isolate. Results from DTW and ms-HRMa cluster analyses were in good agreement with that obtained from enterobacterial repetitive intergenic consensus sequence PCR clustering. While conventional serotyping of Clusters 1 and 2 revealed six different Salmonella serotypes, the majority being S. Weltevraden, the new Salmonella subtyping protocol identified five S. Weltevraden subtypes with S.Weltevreden subtype DTW4-M1 being predominant. Based on knowledge of the sources of Salmonella subtypes, transmission of S. Weltevraden in northern Thailand was likely to be farm-to-farm through contaminated chicken stool. In conclusion, the rapid, robust and specific Salmonella subtyping developed in the study can be performed in a local setting, enabling swift control and preventive measures to be initiated against potential epidemics of salmonellosis.
Similar content being viewed by others
Data Availability
Original data of HRM melting curves used for performing DTW algorithm analysis and source codes are available in the supplementary information file.
References
Arguello H, Carvajal A, Collazos JA et al (2012) Prevalence and serovars of Salmonella enterica on pig carcasses, slaughtered pigs and the environment of four Spanish slaughterhouses. Food Res Int 45:905–912. https://doi.org/10.1016/j.foodres.2011.04.017
Athamanolap P, Parekh V, Fraley SI et al (2014) Trainable high resolution melt curve machine learning classifier for large-scale reliable genotyping of sequence variants. PLoS ONE. https://doi.org/10.1371/journal.pone.0109094
Cardona-Castro N, Sánchez-Jiménez M, Lavalett L et al (2009) Development and evaluation of a multiplex polymerase chain reaction assay to identify Salmonella serogroups and serotypes. Diagn Microbiol Infect Dis 65:327–330. https://doi.org/10.1016/j.diagmicrobio.2009.07.003
Crespo R, Sischo WC, Guard J et al (2016) Population dynamics and antimicrobial resistance of the most prevalent poultry-associated Salmonella serotypes. Poult Sci 96:687–702. https://doi.org/10.3382/ps/pew342
Davies RH, Gosling RJ, Rabie A et al (2018) Observations on the distribution and persistence of monophasic Salmonella Typhimurium on infected pig and cattle farms. Vet Microbiol 227:90–96. https://doi.org/10.1016/j.vetmic.2018.10.032
Druml B, Cichna-markl M (2014) High resolution melting (HRM) analysis of DNA—its role and potential in food analysis. FOOD Chem 158:245–254. https://doi.org/10.1016/j.foodchem.2014.02.111
Forshell LP, Wierup M (2006) Salmonellacontamination: a significant challenge to the global marketing of animal food products. Rev Sci Tech Off Int Epiz 25:541–554
Grimont AD, Patrick F-XW (2007) Antigenic formulae of the Salmonella serovars, 9th edn. Institut Pasteur, Paris
Rossum GV (1995) Python tutorial, Technical Report CS-R9526, Centrum voor Wiskunde en Informatica (CWI). Amsterdam
Herikstad H, Motarjemi Y, Tauxe RV (2002) Salmonella surveillance: a global survey of public health serotyping. Epidemiol Infect 129:1–8. https://doi.org/10.1017/S0950268802006842
Hohmann EL (2001) Nontyphoidal Salmonellosis. Clin Infect Dis 32:263–269
Hunter PR, Gaston MA (1988) Numerical index of the discriminatory ability of typing systems: an application of Simpson’ s index of diversity. J Clin Microbiol 26:2465–2466
Jackson BR, Griffin PM, Cole D et al (2013) Salmonella enterica serotypes and food commodities, United States, 1998–2008. Emerg Infect Dis 19:1239–1244. https://doi.org/10.3201/eid1908.121511
Jones E, Oliphant E, Peterson P et al (2001) Open source scientific tools for Python. SciPy
Keogh EJ, Pazzani MJ (2000) Scaling up dynamic time warping for datamining applications. In: 6th ACM SIGKDD international conference on knowledge discovery and data mining, Boston. pp 285–289
Lu S, Mirchevska G, Phatak SS et al (2017) Dynamic time warping assessment of highresolution melt curves provides a robust metric for fungal identification. PLoS ONE 12:1–21. https://doi.org/10.1371/journal.pone.0173320
McNerney R, Clark TG, Campino S et al (2017) Removing the bottleneck in whole genome sequencing of Mycobacterium tuberculosis for rapid drug resistance analysis: a call to action. Int J Infect Dis 56:130–135. https://doi.org/10.1016/j.ijid.2016.11.422
Padungtod P, Kaneene JB (2006) Salmonella in food animals and humans in northern Thailand. Int J Food Microbiol 108:346–354. https://doi.org/10.1016/j.ijfoodmicro.2005.11.020
Poonchareon K, Pulsrikarn C, Khamvichai S, Tadee P (2019) Feasibility of high resolution melting curve analysis for rapid serotyping of Salmonella from hospitalised patients. J Assoc Med Sci 52:36–40. https://doi.org/10.14456/jams.2018.3
Pulsrikarn C, Pornreongwong S, Tribuddharat C et al (2013) Serogroup and Serovar Distribution of Salmonella in Siriraj Hospital. Siriraj Med J 65:s34–s37
Retamal P, Fresno M, Dougnac C et al (2015) Genetic and phenotypic evidence of the Salmonella enterica serotype Enteritidis human-animal interface in. Front Microbiol 6:1–10. https://doi.org/10.3389/fmicb.2015.00464
Singh P, Mustapha A (2014) Development of a real-time PCR melt curve assay for simultaneous detection of virulent and antibiotic resistant Salmonella. Food Microbiol 44:6–14. https://doi.org/10.1016/j.fm.2014.04.014
Słomka M, Sobalska-kwapis M, Wachulec M et al (2017) High resolution melting (HRM) for high-throughput genotyping—limitations and caveats in practical case studies. Int J Mol Sci 18:2316–2327. https://doi.org/10.3390/ijms18112316
Versalovic J, Koeuth T, Lupski JR (1991) Distribution of repetitive DNA sequences in eubacteria and application to fingerprinting of bacterial genomes. Nucleic Acids Res 19:6823–6831
Wattiau P, Boland C, Bertrand S (2011) Methodologies for Salmonella enterica subsp. Enterica subtyping: gold standards and alternatives. Appl Environ Microbiol 77:7877–7885. https://doi.org/10.1128/AEM.05527-11
Wisittipanit N, Pulsrikarn C, Srisong S, Srimora R, Kittiwan N, Poonchareon K (2020) CRISPR 2 PCR and high resolution melting profiling for identification and characterization of clinically-relevant Salmonella enterica subsp. enterica. PeerJ 8:e9113. https://doi.org/10.7717/peerj.9113
Zaidi MB, Calva JJ, Estrada-garcia MT et al (2008) Integrated Food Chain Surveillance System for Salmonella spp. in Mexico. Emerg Infect Dis 14:429–435
Zeinzinger J, Pietzka AT, Kornschober C et al (2012) One-step triplex high-resolution melting analysis for rapid identification and simultaneous subtyping of frequently isolated. Appl Environ Microbiol. https://doi.org/10.1128/AEM.07668-11
Acknowledgements
The study was supported by the school of Medical Science, University of Phayao, Grant No. 25634988. The authors thank Associate Professor Suphak Mahatthontanahak for research cooperation, Asanai Leng-Ee for geographical illustration of northern Thailand and Professor Emeritus Torpong Sanguansermsri, Thalassemia Unit, University of Phayao, for use of the high resolution DNA melting curve analysis facility, and Professor Emeritus Prapon Wilairat for critical reading and English editing of the manuscript.
Funding
No financial support for this work that could have influenced its outcome.
Author information
Authors and Affiliations
Corresponding author
Ethics declarations
Conflict of interest
All authors declare that they have no conflict of interest.
Ethical approval
The study was conducted with the ethical approval from the Institutional Animal Care and Use Committee, University of Phayao (IACUC-UP), reference no. 62–02-04–001.
Additional information
Publisher's Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Electronic supplementary material
Below is the link to the electronic supplementary material.
Rights and permissions
About this article
Cite this article
Wisittipanit, N., Pulsrikarn, C., Wutthiosot, S. et al. Application of machine learning algorithm and modified high resolution DNA melting curve analysis for molecular subtyping of Salmonella isolates from various epidemiological backgrounds in northern Thailand. World J Microbiol Biotechnol 36, 103 (2020). https://doi.org/10.1007/s11274-020-02874-7
Received:
Accepted:
Published:
DOI: https://doi.org/10.1007/s11274-020-02874-7