Identification and characterization of cytopathogenic Mycoplasma hyorhinis from swine farms with a history of abortions

Jin Ho Shin, Han Soo Joo, Won Hyung Lee, Ho Bong Seok, Maria Calsamig, Carlos Pijoan, Thomas W. Molitor

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A virus-like cytopathic agent isolated from swine farms with a history of recurrent abortion episodes was investigated. We employed a differential display reverse transcription-polymerase chain reaction (ddRT-PCR) to obtain genetic information of the cytopathic agent. Partial nucleotide sequence (527 bp) obtained from differentially displayed PCR fragments showed 88.7% similarity with the 23S rRNA gene of Mycoplasma hyopneumoniae. Unexpectedly, the 5′ portion (1-333 bp) of the sequence shared 96.1% similarity with 5′ untranslated region (UTR) of human prostate tumor inducing gene 1 (PTI-1). Cytopathic effects and extranuclear DNA fluorescence were no longer observed when BM-cyclin was added in the culture medium, suggesting that BM-cyclin sensitive mycoplasma-like organisms caused the cell death. Further evidence supporting the cytopathic agent as a mycoplasma-like organism was obtained by the capability of 3H-thymidine and 3H-uridine incorporation, a single peak in buoyant density gradient profile (1.20-1.24 g/ml), and ultrastructural morphology. Unlike M. hyopneumoniae, the organism was not propagated in Friis medium. Nucleotide sequence of 16S rRNA obtained from the cytopathic agent showed 0.8-1.0% divergences with other M. hyorhinis strains, suggesting that the newly isolated cytopathogenic swine mycoplasma was a variant form of M. hyorhinis. Striking homology between a portion of the 23S rRNA gene of M. hyorhinis and 5′ UTR of human PTI-1 implicated that M. hyorhinis might potentially be related to the evolution of human PTI-1.

Original languageEnglish (US)
Pages (from-to)501-509
Number of pages9
JournalJournal of Veterinary Medical Science
Issue number4
StatePublished - Apr 2003


  • Differential display
  • Genetic identification
  • Mycoplasma hyorhinis


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