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Structural variation in the 16S-23S rRNA intergenic spacers of Vibrio parahaemolyticus.

The 16S-23S rRNA intergenic spacers (IGS) of Vibrio parahaemolyticus were PCR-amplified and cloned with pT7Blue T vector. A total of six clones were isolated dependent on size difference. The clones were different with respect to both the number and the composition of the tRNA genes included, and were designated IGS-0, IGS-E, IGS-IA, IGS-AE, IGS-EKV and IGS-EKAV. IGS-EKAV included the cluster of tRNA(Glu)-tRNA(Lys)-tRNA(Ala)-tRNA(Val); IGS-EKV, tRNA(Glu)-tRNA(Lys)-tRNA(Val); IGS-AE, tRNA(Ala)-tRNA(Glu); IGS-IA, tRNA(Ile)-tRNA(Ala); and IGS-E, tRNA(Glu). IGS-0 had no tRNA gene. Some similarities were found in the nucleotide sequence of the non-coding regions flanked by the tRNA genes. The structure difference found in the spacers is meaningful for elucidating the evolutionary line of each ribosomal RNA operon and the profile is applicable as a molecular marker of the bacterium.