Characterization of polymorphisms in the toxin A and B genes of Clostridium difficile

FEMS Microbiol Lett. 1997 Mar 15;148(2):197-202. doi: 10.1111/j.1574-6968.1997.tb10288.x.


We have used six independent polymerase chain reactions (A1-A3 and B1-B3) for amplification of the entire sequence of the two toxin genes tcdA and tcdB of several Clostridium difficile strains. With this approach we have detected (1) restriction site polymorphisms which are distributed all over the genes, and (2) deletions that could be found only in tcdA. Characteristic differences between strains were mainly focused to the 5' third of tcdB (B1 fragment) and/or the 3' third of tcdA (A3 fragment). The possible use of our approach for typing of C. difficile toxin genes is discussed.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Bacterial Proteins*
  • Bacterial Toxins / genetics*
  • Clostridium difficile / genetics*
  • Enterotoxins / genetics*
  • Genes, Bacterial*
  • Polymerase Chain Reaction
  • Polymorphism, Genetic
  • Polymorphism, Restriction Fragment Length


  • Bacterial Proteins
  • Bacterial Toxins
  • Enterotoxins
  • tcdA protein, Clostridium difficile
  • toxB protein, Clostridium difficile