title: Intervening sequences in rrl genes and fragmentation of 23S rRNA in genera of the family Enterobacteriaceae.
abstract: Intervening sequences (IVSs) in the rrl genes for 23S rRNA are transcribed but later removed by RNase III without religation during RNA processing, leading to fragmented rRNA. We examined about 240 strains of the family Enterobacteriaceae for presence of IVSs using PCR. No IVSs were detected in strains belonging to Escherichia, Shigella, Enterobacter, Erwinia, Ewingella, Hafnia, Kluyvera, Morganella, Pantoea, or Serratia. Previously unreported IVSs were detected in Klebsiella oxytoca, Citrobacter amalonaticus, and Providencia stuartii; previously reported IVSs are in species of Salmonella, Proteus, Providencia, and Yersinia. The sporadic distribution of IVSs indicates lateral genetic transfer of IVSs.
authors.affiliation: Salmonella Genetic Stock Centre, Department of Biological Sciences, University of Calgary, Calgary, Alberta, Canada T2N 1N4.
authors.forename: L M
authors.initials: LM
authors.lastname: Pronk
authors.forename: K E
authors.initials: KE
authors.lastname: Sanderson
mesh_terms: D001483:Base Sequence; D004755:Enterobacteriaceae / Q000235:genetics; D005798:Genes, Bacterial; D020459:Genes, rRNA; D007438:Introns; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction; D012335:RNA, Ribosomal / Q000235:genetics; D012338:RNA, Ribosomal, 23S / Q000235:genetics*; D016415:Sequence Alignment
chemical_list: D012335:RNA, Ribosomal; D012338:RNA, Ribosomal, 23S