Related Experiment Videos
Updating the H-antigen classification of Bacillus thuringiensis
M M Lecadet1, E Frachon, V C Dumanoir
1Unité des Bactéries Entomopathogènes, Institut Pasteur, Paris, France.
Journal of Applied Microbiology
|April 23, 1999
Summary
Bacillus thuringiensis strain classification is updated with 82 serovars identified using flagellar antigens. Emerging atypical crystals and increasing cross-reacting antigens in Bacillus cereus suggest evolving microbial dynamics.
Area of Science:
- Microbiology
- Bacteriology
- Immunology
Background:
- Traditional classification of Bacillus thuringiensis strains relies on flagellar antigens.
- Ongoing research aims to refine and update existing taxonomic frameworks for bacterial species.
Purpose of the Study:
- To revise and update the classification of Bacillus thuringiensis strains.
- To assess the value of biochemical characters for subspecies identification.
- To analyze crystal morphology, delta-endotoxin profiles, and larvicidal activity of newly identified serovars.
Main Methods:
- Utilized flagellar antigens for strain classification.
- Identified 69 serotypes and 13 sub-antigenic groups, resulting in 82 serovars.
- Performed crystal analysis including morphology, delta-endotoxin profiles, and larvicidal activity.
- Investigated biochemical characters for subspecies identification.
Main Results:
- Identified 82 serovars among 3500 Bacillus thuringiensis isolates.
- Observed an increase in atypical crystals with novel components.
- Found no susceptible insects among known target species for newly identified serovars.
- Noted an increasing number of cross-reacting H-antigens among Bacillus cereus strains.
Conclusions:
- The classification of Bacillus thuringiensis has been significantly expanded.
- Atypical crystal production is becoming more prevalent in Bacillus thuringiensis.
- Increasing cross-reactivity between Bacillus thuringiensis and Bacillus cereus H-antigens may hold biological significance.