title: Rapid distinction between Leptonema and Leptospira by PCR amplification of 16S-23S ribosomal DNA spacer.
abstract: The PCR amplification of the genomic DNA of Leptonema illini strain 3055 using primers directed against conserved regions of the rRNA operon provided evidence that the 16S and 23S rRNA genes were linked via an intergenic spacer region. The sequencing of the intergenic spacer region indicated that it was 435 nucleotides in length and sequence similarity searches revealed that it bore no homology to any known sequences including tRNA available in databases. Further investigations using Southern blot hybridization revealed that there were two copies of these linked genes in the genome. However, similar PCR studies on a representative strain from each of the 23 serogroups of Leptospira interrogans, which are pathogenic, and eight strains from the 6 serogroups of Leptospira biflexa, which are non-pathogenic, revealed that the 16S and 23S rRNA genes were not linked.
authors: School of Biomolecular and Biomedical Sciences, Faculty of Science and Technology, Griffith University, Nathan, Australia.
authors: T H
authors: TH
authors: Woo
authors: L D
authors: LD
authors: Smythe
authors: M L
authors: ML
authors: Symonds
authors: M A
authors: MA
authors: Norris
authors: M F
authors: MF
authors: Dohnt
authors: B K
authors: BK
authors: Patel
mesh_terms: D001483:Base Sequence; D017931:DNA Primers / Q000235:genetics; D004269:DNA, Bacterial / Q000235:genetics*; D004275:DNA, Ribosomal / Q000235:genetics*; D008040:Genetic Linkage; D007919:Leptospira / Q000235:genetics*; D016953:Leptospiraceae / Q000235:genetics*; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction; D012329:RNA, Bacterial / Q000235:genetics; D012336:RNA, Ribosomal, 16S / Q000235:genetics*; D012338:RNA, Ribosomal, 23S / Q000235:genetics*; D013045:Species Specificity
chemical_list: D017931:DNA Primers; D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D012329:RNA, Bacterial; D012336:RNA, Ribosomal, 16S; D012338:RNA, Ribosomal, 23S