Multilocus Sequence Typing Lacks the Discriminatory Ability of Pulsed-Field Gel Electrophoresis for Typing Salmonella enterica Serovar Typhimurium

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Fakhr, Mohamed
Logue, Catherine
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Nolan, Lisa
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Veterinary Microbiology and Preventive Medicine
Our faculty promote the understanding of causes of infectious disease in animals and the mechanisms by which diseases develop at the organismal, cellular and molecular levels. Veterinary microbiology also includes research on the interaction of pathogenic and symbiotic microbes with their hosts and the host response to infection.
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Nontyphoidal salmonellae are among the leading causes of food-borne disease in the United States. Because of the importance of Salmonella enterica in food-borne disease, numerous typing methodologies have been developed. Among the several molecular typing methods, pulsed-field gel electrophoresis (PFGE) is currently considered the “gold standard” technique in typing Salmonella. The aim of this study was to compare the discriminatory power of PFGE to multilocus sequence typing (MLST) in typing Salmonella enterica serovar Typhimurium clinical isolates. A total of 85 Salmonella Typhimurium clinical isolates from cattle were used in this study. PFGE using XbaI was performed on the 85 isolates by the Centers for Disease Control and Prevention method, and data were analyzed using the BioNumerics software package. Fifty PFGE profiles were observed among the isolates, and these grouped into three major clusters. For the MLST analysis, the manB, pduF, glnA, and spaM genes were amplified by PCR from the same 85 isolates. DNA sequencing of these four genes, manB, pduF, glnA, andspaM, showed no genetic diversity among the isolates tested, with a 100% identity in nucleotide sequence. Moreover, the DNA sequences of the aforementioned genes showed 100% identity to the sequence reported in GenBank for the S. enterica serovar Typhimurium LT2 strain. Therefore, MLST, using these genes, lacks the discriminatory power of PFGE for typing Salmonella entericaserovar Typhimurium.


This article is from Journal of Clinical Microbiology 43, no. 5 (May 2005): 2215–2219, doi:10.1128/JCM.43.5.2215-2219.2005.

Sat Jan 01 00:00:00 UTC 2005