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A Novel Toxinotyping Scheme and Correlation of Toxinotypes with Serogroups of Clostridium difficile Isolates

Open access
Rupnik, Maja, Avesani, Véronique, Janc, Miha, von Eichel-Streiber, Christoph, Delmée, Michel·1998·Journal of Clinical Microbiology

Abstract

Two hundred nineteen Clostridium difficile isolates from 22 serogroups were screened for changes in the genes coding for toxin B ( tcdB ) and toxin A ( tcdA ). Parts of the toxin genes were amplified, and the PCR fragments were checked for length polymorphisms and cut with several restriction enzymes to monitor restriction fragment length polymorphisms (RFLPs). For 47 strains (21%), differences in the toxin genes were found compared to the toxin genes of reference strain VPI 10463. Polymorphisms were usually observed in both toxin genes. RFLPs were more commonly found in the tcdB gene, in which a single restriction enzyme could give up to five different patterns. Restriction sites seemed to be less heterogeneous in the tcdA gene, in which for most enzymes only two different RFLPs were recognized. However, deletions were observed in tcdA , and four new types of shortened tcdA genes are described. According to the changes in their toxin genes, variant strains could be divided into 10 groups (toxinotypes I to X). A toxinotype was characterized by similar patterns of changes in the toxin genes and in other regions of the pathogenicity locus and also similar pulsed-field gel electrophoresis patterns. Variant toxinotypes were found in 9 of the 22 serogroups studied, and some toxinotypes were clearly associated with specific serogroups. Toxinotype VIII is characteristic for all strains of serogroup F. Other serogroups in which variant toxinotypes were commonly found are A1, A15, E, and X. Testing of variability in C. difficile toxin genes not only might be useful as a molecular typing system but also could have implications in diagnostics and pathogenesis.

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Crossref · 10.1128/jcm.36.8.2240-2247.1998

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Metadata

Authors
Rupnik, M., Avesani, V., Janc, M., von Eichel-Streiber, C., & Delmée, M.
Venue
Journal of Clinical Microbiology
Published
1998-08
Volume
36
Issue
8
Pages
2240-2247
ISSN
  • 0095-1137 (ISSN-L)
  • 1098-660X
OpenAlex
W2115419460
Cited by
323
References
18
FWCI
5.82
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: A Novel Toxinotyping Scheme and Correlation of Toxinotypes with Serogroups of Clostridium difficile Isolates. https://app.cochat.ai/papers/10.1128/jcm.36.8.2240-2247.1998
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Rupnik, M., Avesani, V., Janc, M., von Eichel-Streiber, C., & Delmée, M. (1998). A Novel Toxinotyping Scheme and Correlation of Toxinotypes with Serogroups of Clostridium difficile Isolates. Journal of Clinical Microbiology. https://doi.org/10.1128/jcm.36.8.2240-2247.1998

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