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. 1987 Dec;53(12):2808–2814. doi: 10.1128/aem.53.12.2808-2814.1987

Use of oligonucleotide probes to study the relatedness of delta-endotoxin genes among Bacillus thuringiensis subspecies and strains.

G Prefontaine 1, P Fast 1, P C Lau 1, M A Hefford 1, Z Hanna 1, R Brousseau 1
PMCID: PMC204203  PMID: 2829720

Abstract

Fifteen Bacillus thuringiensis strains representing 13 serotypes were screened with five oligodeoxyribonucleotide probes specific for certain regions of two published sequences and one unpublished sequence of B. thuringiensis delta-endotoxin genes. Of the 15 cultures, 14 hybridized with at least one probe; the B. thuringiensis subsp. thompsoni strain alone did not hybridize. Two B. thuringiensis subsp. kurstaki strains of commercial interest, HD-1 and NRD-12, were found to be so closely related as to be indistinguishable with this technique; the same situation was found with strains from B. thuringiensis subspp. dendrolimus and sotto. Five strains were identified as probably containing only one endotoxin gene. A probe specific for the gene from the B. thuringiensis subsp. kurstaki HD-73 strain hybridized to only 3 of the 15 cultures tested. The hybridization data suggest that the DNA sequences coding for the C-terminal region of the endotoxin protein are as well conserved as those coding for the N-terminal toxic portion.

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Selected References

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