Design and Validation of New Primers for Specific and Sensitive Real-time PCR Detection and Quantification of Seven Botulinum Encoding Genes (Serotype A-G) of Clostridium botulinum
Botulinum neurotoxins (BoNTs) comprise a highly diverse group of seven serotypes (from A-G) and over 40 subtypes worldwide. Previous primer- and probe-based nucleic acid amplification tests (NAATs) for detection of BoNT encoding genes are challenged by high levels of nucleotide polymorphism both across and within subtypes. In this study, multiple BoNT gene sequences were aligned to identify…
The international botulism surveillance landscape is limited by the high variability in botulinum neurotoxin (BoNT) genes, with seven serotypes (A-G) and over 40 subtypes. Existing nucleic acid amplification tests (NAATs) struggle to detect all seven serotypes due to these polymorphisms. Researchers aimed to address this limitation by designing new primers that target highly conserved regions across all serotypes.
In this study, multiple BoNT gene sequences were aligned to pinpoint these conserved sequences. Specific primer sets were then designed and rigorously validated using various methods. In silico analysis, conventional PCR with plasmids carrying target fragments, and real-time PCR with spiked food matrices were employed.
The newly developed procedure demonstrated exceptional specificity and sensitivity, detecting all seven BoNT serotypes with just 10 copies per reaction. The turnaround time for the entire process was approximately 1.5 hours. A key innovation was the elimination of carryover PCR products using uracil-N-glycosylase and dUTP in the reaction mix.
This novel NAAT not only provides comprehensive coverage of botulinum serotypes but also complements traditional mouse bioassays, significantly bolstering global botulism surveillance efforts.
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