Background: Among the Bacillus cereus group, B. thuringiensis, is one of the most extensively used biological control agent. The present study reports the complete genome and four novel plasmid analysis of the type strain B. thuringiensis ATCC 10792.
Methods: Complete genome sequencing of Bacillus thuringiensis ATCC 10792, assembled using de-novo (v.3.2.0, assembly name MIRA3), Pac-Bio sequencers and Hierarchical Genome Assembly Process software (version 4.1) and real-time polymerase chain reaction (qPCR) is a consistent technique for quantifying gene expression based on specific biomarkers, in addition the efficiency of the primers were analysed based on artificially spiked food samples on lettuce, kimbab and spinach with B. thuringiensis ATCC 10792.
Results: Complete genome annotation was performed, and a total of 6269 proteins with 5427594 bps were identified and four novel plasmid (poh2, poh3, poh4, poh5) a total of 134, 131, 96, 21 proteins with 113294; 92,949; 86488; 11332 bps were identified. Six selective genes (lipoprotein-lipo, methyltransferase-MT, S-layer homology domain protein-BC, flagellar motor protein-motB, transcriptional regulator-XRE, crystal protein-cry2) and associated four novel plasmids were investigated along with the characteristics and expression profiles of two housekeeping genes (chaperonin protein-GroEL and topoisomerase enzyme-gyrB). Although from the assessment of 120 strains, both GroEL and gyrB showed 100% specificity towards detection of both B. thuringiensis in artificially spiked vegetable samples. All the eight genes revealed no specificity towards any of the 9 non- Bacillus strains.
Conclusion: In our study based on the complete genome and plasmid sequence of B. thuringiensis ATCC 10792, among the six discriminating genes, specifically GroEL, gyrB and XRE showed promising results in identifying B. thuringiensis ATCC 10792, and there detection limit was 3.0-9.6 log CFU/g in the food samples respectfully. The key role in control of the predatory biological agent.
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