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Genetic diversity of Staphylococcus equorum isolates from Saeu-jeotgal evaluated by multilocus sequence typing

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Abstract

Staphylococcus equorum, the predominant bacterial species detected in Saeu-jeotgal, a Korean high-salt fermented seafood, is a candidate starter bacterium for Saeu-jeotgal fermentation. A multilocus sequence typing (MLST) scheme was developed to evaluate the genetic diversity and background of S. equorum strains isolated from Saeu-jeotgal. A total of 135 strains, including 117 isolates from Saeu-jeotgal, and others from Myeolchi-jeotgal, sausage, cheese and horse skin, were subjected to MLST, and the internal fragments of seven housekeeping genes, aroE, dnaJ, glpF, gmk, hsp60, mutS, and pta, were compared. This MLST scheme produced 45 sequence types (STs) and the eBURST algorithm clustered the STs into nine clonal groups and seven singletons. Clonal group 1, the major group, consisted of 30 isolates from cheese, Saeu-jeotgal and sausages, which were classified into 12 STs. The predominant ST, ST26, comprised 25 isolates and presented as a singleton. Most of the isolates from Myeolchi-jeotgal and sausages clustered on two different branches of a phylogenetic tree generated with a cluster analysis using the maximum likelihood algorithm. This MLST scheme established the genetic backgrounds of S. equorum strains isolated from different types of food. Among the housekeeping genes used for MLST, gmk had the fewest allele types and fairly low sequence identities (74.0–90.0 %) within the Staphylococcus species. Therefore, sequence analyses of the gmk gene and 16S rRNA gene can be used for the accurate and rapid identification of S. equorum.

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Acknowledgments

The eleven S. equorum strains from sausages used herein were kindly provided by Dr. Sabine Leroy from the Institut National De La Recherche Agronomique in France. S. equorum Mu2 from cheese was kindly provided by Dr. Francoise Irlinger at the same research center. This research was supported by the R&D Convergence Center Support Program, Ministry of Agriculture, Food and Rural Affairs, Republic of Korea, and supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Education, Science and Technology (NRF-2012R1A1A2039955).

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  1. Department of Food Science and Biotechnology, Kyonggi University, Suwon, 443-760, Republic of Korea

    Do-Won Jeong, Hye-Rim Kim & Jong-Hoon Lee

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  1. Do-Won Jeong
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Correspondence to Jong-Hoon Lee.

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Jeong, DW., Kim, HR. & Lee, JH. Genetic diversity of Staphylococcus equorum isolates from Saeu-jeotgal evaluated by multilocus sequence typing. Antonie van Leeuwenhoek 106, 795–808 (2014). https://doi.org/10.1007/s10482-014-0249-6

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