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The genus Carnobacterium is currently divided into the following eight species: Carnobacterium piscicola, C. divergens, C. gallinarum, C. mobile, C. funditum, C. alterfunditum, C. inhibens, and C. viridans. An identification tool for the rapid differentiation of these eight Carnobacterium species was developed, based on the 16S-23S ribosomal DNA (rDNA) intergenic spacer region (ISR). PCR-restriction fragment length polymorphism (PCR-RFLP) analysis of this 16S-23S rDNA ISR was performed in order to obtain restriction profiles for all of the species. Three PCR amplicons, which were designated small ISR (S-ISR), medium ISR (M-ISR), and large ISR (L-ISR), were obtained for all Carnobacterium species. The L-ISR sequence revealed the presence of two tRNA genes, tRNA(Ala) and tRNA(Ile), which were separated by a spacer region that varied from 24 to 38 bp long. This region was variable among the species, allowing the design of species-specific primers. These primers were tested and proved to be species specific. The identification method based on the 16S-23S rDNA ISR, using PCR-RFLP and specific primers, is very suitable for the rapid low-cost identification and discrimination of all of the Carnobacterium species from other phylogenetically related lactic acid bacteria.

applied and environmental microbiology

Identification of <i>Carnobacterium</i> Species by Restriction Fragment Length Polymorphism of the 16S-23S rRNA Gene Intergenic Spacer Region and Species-Specific PCR

Identification of Carnobacterium Species by Restriction Fragment Length Polymorphism of the 16S-23S rRNA Gene Intergenic Spacer Region and Species-Specific PCR