Specific detection of Serpulina hyodysenteriae and potentially pathogenic weakly beta-haemolytic porcine intestinal spirochetes by polymerase chain reaction targeting 23S rDNA

Thomas Leser, Kristian Møller, Tim Kåre Jensen, Sven Erik Lind Jorsal

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    A 2470-bp section of the 23S ribosomal DNA from Serpulina hyodysenteriae and five biochemical ly different groups of weakly beta-haemolytic porcine intestinal Serpulina strains was sequenced. The similarity between the sequenced strains was high (96.85% to 99.84%). A phylogenetic tree was estimated by the maximum likelihood method. The sequenced strains formed three groups. Serpulina hyodysenteriae and biochemical group II ('S. intermedius') formed a cluster, but 20 nucleotide positions were different between the two, suggesting that biochemical group II is a separate species. Another cluster consisted of the closely related biochemical group IIIa ('S. murdochii') and IIIb/c (S. innocens) (99.84% similarity), while biochemical group IV (S. pilosicoli) constituted a separate group with a relatively low similarity (96.85% to 9701%) to the other groups. Three primer pairs were designed for specific PCR detection of the clinically important S. hyodysenteriae and biochemical group II and IV. PCR amplification was accomplished with DNA extracted from bacterial colonies by a simple boiling procedure, and with DNA extracted directly from porcine stool samples using a bead beating extraction procedure. The level of detection for the direct extraction and amplification method was 5 x 10(5) cells added g(-1) normal faeces.
    Original languageEnglish
    JournalMolecular and Cellular Probes
    Volume11
    Issue number5
    Pages (from-to)363-372
    ISSN0890-8508
    DOIs
    Publication statusPublished - 1997

    Keywords

    • detection
    • 23S rDNA
    • intestinal spirochetes
    • PCR

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