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  • Title: Intragenomic heterogeneity of the 16S rRNA-23S rRNA internal transcribed spacer among Pseudomonas syringae and Pseudomonas fluorescens strains.
    Author: Milyutina IA, Bobrova VK, Matveeva EV, Schaad NW, Troitsky AV.
    Journal: FEMS Microbiol Lett; 2004 Oct 01; 239(1):17-23. PubMed ID: 15451096.
    Abstract:
    The 16S-23S rRNA internal transcribed spacer regions (ITS1) from 14 strains of Pseudomonas syringae and P. fluorescens were sequenced. ITS1 exhibited significant sequence variability among different operons within a single genome. From 1 to 4 types of ITS1 were found in individual genomes of the P. syringae and P. fluorescens strains. A total of eight ITS1 types were identified among strains studied. The ITS1 nucleotide sequences consisted of conserved blocks including, among others, a stem-forming region of box B, tRNAIle and tRNAAla genes and several variable blocks. The differences in the variable regions were mostly due to insertions and/or deletions of nucleotide blocks. The intragenomic heterogeneity of ITS1 was brought about by different combinations of variable blocks, which possibly have resulted from recombination and horizontal transfer.
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