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Development of Multiplex PCR Assays for the Identification of the 33 Serotypes of Streptococcus suis
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Development of Multiplex PCR Assays for the Identification of the 33 Serotypes of Streptococcus suis
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Development of Multiplex PCR Assays for the Identification of the 33 Serotypes of Streptococcus suis
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Journal Article
Development of Multiplex PCR Assays for the Identification of the 33 Serotypes of Streptococcus suis
2013
Overview
Streptococcussuis is an important zoonotic agent causing severe diseases in pigs and humans. To date, 33 serotypes of S. suis have been identified based on antigenic differences in the capsular polysaccharide. The capsular polysaccharide synthesis (cps) locus encodes proteins/enzymes that are responsible for capsular production and variation in the capsule structures are the basis of S. suis serotyping. Multiplex and/or simplex PCR assays have been developed for 15 serotypes based on serotype-specific genes in the cps gene cluster. In this study, we developed a set of multiplex PCR (mPCR) assays to identify the 33 currently known S. suis serotypes. To identify serotype-specific genes for mPCR, the entire genomes of reference strains for the 33 serotypes were sequenced using whole genome high-throughput sequencing, and the cps gene clusters from these strains were identified and compared. We developed a set of 4 mPCR assays based on the polysaccharide polymerase gene wzy, one of the serotype-specific genes. The assays can identify all serotypes except for two pairs of serotypes: 1 and 14, and 2 and 1/2, which have no serotype-specific genes between them. The first assay identifies 12 serotypes (serotypes 1 to 10, 1/2, and 14) that are the most frequently isolated from diseased pigs and patients; the second identifies 10 serotypes (serotypes 11 to 21 except 14); the third identifies the remaining 11 serotypes (serotypes 22 to 31, and 33); and the fourth identifies a new cps cluster of S. suis discovered in this study in 16 isolates that agglutinated with antisera for serotypes 29 and 21. The multiplex PCR assays developed in this study provide a rapid and specific method for molecular serotyping of S. suis.
Publisher
Public Library of Science,Public Library of Science (PLoS)
Subject
/ Antigens
/ Antisera
/ Assaying
/ Bacterial Capsules - chemistry
/ Clusters
/ CPS gene
/ Fetuses
/ Genes
/ Genomes
/ Genomics
/ High-Throughput Nucleotide Sequencing
/ Hogs
/ Humans
/ Multiplex Polymerase Chain Reaction - methods
/ Polysaccharides, Bacterial - classification
/ Polysaccharides, Bacterial - genetics
/ Polysaccharides, Bacterial - immunology
/ Polysaccharides, Bacterial - isolation & purification
/ Proteins
/ Streptococcal Infections - microbiology
/ Streptococcus suis - classification
/ Streptococcus suis - genetics
/ Streptococcus suis - immunology
/ Streptococcus suis - isolation & purification
/ Swine
/ Zoonoses
