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Appl Environ Microbiol. Sep 1993; 59(9): 3011–3020.
PMCID: PMC182400

Detection of the genes encoding botulinum neurotoxin types A to E by the polymerase chain reaction.

Abstract

The polymerase chain reaction (PCR) was used as the basis for the development of highly sensitive and specific diagnostic tests for organisms harboring botulinum neurotoxin type A through E genes. Synthetic DNA primers were selected from nucleic acid sequence data for Clostridium botulinum neurotoxins. Individual components of the PCR for each serotype (serotypes A through E) were adjusted for optimal amplification of the target fragment. Each PCR assay was tested with organisms expressing each of the botulinum neurotoxin types (types A through G), Clostridium tetani, genetically related nontoxigenic organisms, and unrelated strains. Each assay was specific for the intended target. The PCR reliably identified multiple strains having the same neurotoxin type. The sensitivity of the test was determined with different concentrations of genomic DNA from strains producing each toxin type. As little as 10 fg of DNA (approximately three clostridial cells) was detected. C. botulinum neurotoxin types A, B, and E, which are most commonly associated with human botulism, could be amplified from crude DNA extracts, from vegetative cells, and from spore preparations. This suggests that there is great potential for the PCR in the identification and detection of botulinum neurotoxin-producing strains.

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