title: Expanded genomic map of Campylobacter jejuni UA580 and localization of 23S ribosomal rRNA genes by I-CeuI restriction endonuclease digestion.
abstract: The genomic map of Campylobacter jejuni UA580 was expanded and more precisely constructed using I-CeuI, Sal/I and SmaI restriction endonucleases in conjunction with pulsed-field gel electrophoresis (PFGE). The presence of three fragments after digestion with I-CeuI confirmed the presence of three copies of the 23S ribosomal rRNA (rrl) gene. The genome size of Campylobacter jejuni UA580 was determined to be 1725 +/- 5.9 kbp by I-CeuI with fragment sizes of 1053 +/- 4.4, 361 +/- 2.7 and 311 +/- 3.6 kbp. Analysis of a PCR product from C. jejuni UA580 23S rRNA gene showed that I-CeuI did cut within the gene. The precise locations of the three genes were determined using I-CeuI with two copies of the 23S and 5S rRNA genes located separately from the 16S rRNA gene whereas the third copy of the 23S and 5S rRNA genes had a closer linkage to a 16S rRNA gene copy. Homologous gene probes were used to map additional genes and allowed the realignment of a few previously mapped genes on the chromosome. Other strains of C. jejuni were also cut into three fragments with I-CeuI, which generated variable PFGE patterns.
authors.affiliation: Department of Medical Microbiology and Immunology, University of Alberta, Edmonton, Canada.
authors.forename: E
authors.initials: E
authors.lastname: Newnham
authors.forename: N
authors.initials: N
authors.lastname: Chang
authors.forename: D E
authors.initials: DE
authors.lastname: Taylor
mesh_terms: D016123:Campylobacter jejuni / Q000235:genetics*; D002874:Chromosome Mapping; D015342:DNA Probes / Q000235:genetics; D016521:Electrophoresis, Gel, Pulsed-Field; D004706:Endodeoxyribonucleases / Q000378:metabolism*; D016678:Genome; D016133:Polymerase Chain Reaction; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012338:RNA, Ribosomal, 23S / Q000235:genetics*; D012341:RNA, Ribosomal, 5S / Q000235:genetics; D015183:Restriction Mapping
chemical_list: D015342:DNA Probes; D012336:RNA, Ribosomal, 16S; D012338:RNA, Ribosomal, 23S; D012341:RNA, Ribosomal, 5S; D004706:Endodeoxyribonucleases; C071132:endodeoxyribonuclease I-CeuI