Antibiotic-induced expression of a cryptic cpb2 gene in equine beta2-toxigenic Clostridium perfringens

Vilei, Edy M.; Schlatter, Yvonne; Perreten, Vincent; Straub, Reto; Popoff, Michel R.; Gibert, Maryse; Gröne, Andrea; Frey, Joachim (2005). Antibiotic-induced expression of a cryptic cpb2 gene in equine beta2-toxigenic Clostridium perfringens. Molecular microbiology, 57(6), pp. 1570-1581. Blackwell Science 10.1111/j.1365-2958.2005.04789.x

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The cpb2 gene of beta2-toxigenic Clostridium perfringens isolated from horses, cattle, sheep, human and pigs was sequenced. The cpb2 gene of equine and other non-porcine isolates differed from porcine isolates by the absence of an adenine in a poly A tract immediately downstream of the start codon in all non-porcine C. perfringens strains. This deletion involved formation of a cryptic gene harbouring a premature stop codon after only nine amino acid codons, while the full beta2-toxin protein consists of 265 amino acids. Immunoblots carried out with antibodies directed against a recombinant beta2-toxin showed the absence of expression of the beta2-toxin in equine and the other non-porcine strains under standard culture conditions. However, treatment of C. perfringens with the aminoglycosides gentamicin or streptomycin was able to induce expression of the cpb2 gene in a representative equine strain of this group, presumably by frameshifting. The presence of the beta2-toxin was revealed by immunohistology in tissue samples of small and large intestine from horses with severe typhlocolitis that had been treated before with gentamicin. This result may explain the finding that antibiotic treatment of horses affected by beta2-toxigenic C. perfringens leads to a more accentuated and fatal progression of equine typhlocolitis. Clinical observations show a reduced appearance of strong typhlocolitis in horses with intestinal complications admitted to hospital care since the standard use of gentamicin has been abandoned. This is the first report on expression of a bacterial toxin gene by antibiotic-induced ribosomal frameshifting.

Item Type:

Journal Article (Original Article)

Division/Institute:

05 Veterinary Medicine > Research Foci > Host-Pathogen Interaction
05 Veterinary Medicine > Department of Clinical Veterinary Medicine (DKV) > Equine Clinic
05 Veterinary Medicine > Department of Infectious Diseases and Pathobiology (DIP) > Institute of Veterinary Bacteriology

UniBE Contributor:

Vilei, Edy; Schlatter, Yvonne; Perreten, Vincent; Straub, Reto and Frey, Joachim

Subjects:

600 Technology > 630 Agriculture
500 Science > 570 Life sciences; biology

ISSN:

0950-382X

Publisher:

Blackwell Science

Language:

English

Submitter:

Vincent Perreten

Date Deposited:

24 Sep 2014 15:05

Last Modified:

06 Mar 2015 16:24

Publisher DOI:

10.1111/j.1365-2958.2005.04789.x

PubMed ID:

16135225

BORIS DOI:

10.7892/boris.52022

URI:

https://boris.unibe.ch/id/eprint/52022

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