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Bacillus thuringiensis  serovar  israelensis  ( Bti ) is used to control insect vectors of human and animal diseases. In the present study, the toxicity of four strains of  Bti , named T0124, T0131, T0137, and T0139, toward  Aedes aegypti  and  Culex quinquefasciatus  larvae was analyzed. The T0131 strain showed the highest larvicidal activity against  A. aegypti  (LC 50  = 0.015 µg/ml) and  C. quinquefasciatus  larvae (LC 50  = 0.035 µg/ml) when compared to the other strains. Furthermore, the genomic sequences of the four strains were obtained and compared. These  Bti  strains had chromosomes sizes of approximately 5.4 Mb with GC contents of ~35% and 5472–5477 putative coding regions. Three small plasmids (5.4, 6.8, and 7.6 kb) and three large plasmids (127, 235, and 359 kb) were found in the extrachromosomal content of all four strains. The SNP-based phylogeny revealed close relationship among isolates from this study and other  Bti  isolates, and SNPs analysis of the plasmids 127 kb did not reveal any mutations in δ-endotoxins genes. This newly acquired sequence data for these  Bti  strains may be useful in the search for novel insecticidal toxins to improve existing ones or develop new strategies for the biological control of important insect vectors of human and animal diseases.

Comparative genomic analysis and mosquito larvicidal activity of four Bacillus thuringiensis serovar israelensis strains