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A total of 119 Bacillus thuringiensis strains (83 type strains and 26 native isolates), as well as five B. cereus group species, were analyzed by repetitive extragenic palindromic sequence-based PCR analysis (Rep-PCR) fingerprinting. Primers Bc-REP-1 and Bc-REP-2 were specifically designed according to an extragenic 26-bp repeated sequence found in the six B. cereus group genomes reported. A total of 47 polymorphic bands were detected, and the patterns varied from 5 to 13 bands in number and from 0.2 to 3.8 kb in size. Virtually each type strain showed a distinctive B. cereus (Bc)-Rep-PCR pattern, except for B. thuringiensis serovars dakota (H serotype 15 [H15]) and sotto (H4a,4b), as well as serovars amagiensis (H29) and seoulensis (H35), which shared the same patterns. As expected, serovar entomocidus (H6) and its biovar subtoxicus showed an identical pattern; similarly, serovars sumiyoshiensis (H3a,3d) and fukuokaensis (H3a,3d,3e), which share two antigenic determinants, also showed identical Bc-Rep-PCR patterns. Interestingly, serovars israelensis (H14) and malaysiensis (H36), which share several phenotypic attributes, also showed identical Bc-Rep-PCR patterns. Native, coleopteran-active strains, including the self-agglutinated LBIT-74 strain, showed Bc-Rep-PCR patterns identical or very similar to that of the tenebrionis strain. Likewise, native mosquitocidal strains (including some self-agglutinated strains) also showed patterns identical or very similar to that of the serovar israelensis IPS-82 strain. Additionally, native beta-exotoxin-producing strains from serovar thuringiensis showed patterns identical to that of the B. thuringiensis type strain. The B. cereus group-specific Bc-Rep-PCR fingerprinting technique was shown to be highly discriminative, fast, easy, and able to identify B. thuringiensis serotypes, including nonflagellar and self-agglutinated strains.

applied and environmental microbiology

Fingerprinting of <i>Bacillus thuringiensis</i> Type Strains and Isolates by Using <i>Bacillus cereus</i> Group-Specific Repetitive Extragenic Palindromic Sequence-Based PCR Analysis

Fingerprinting of Bacillus thuringiensis Type Strains and Isolates by Using Bacillus cereus Group-Specific Repetitive Extragenic Palindromic Sequence-Based PCR Analysis