title: Detection of same sized 4.3 Kb extrachromosomal DNA elements in weakly beta-haemolytic human intestinal spirochaetes and Serpulina pilosicoli of swine origin.
abstract: Agarose gel electrophoresis of total DNA from Italian strains of weakly beta-haemolytic human intestinal spirochaetes (w beta HIS) and porcine Serpulina pilosicoli reference strain P43/6/78 showed an extrachromosomal band having the same size and migrating at 4.3 Kb. The same results were observed after agarose gel electrophoresis of DNA obtained from the supernatant fluids of the spirochaetal cultures analysed. Swine Serpulina hyodysenteriae reference strain P18A was comparatively analysed and a 6.5 Kb extrachromosomal DNA element was found, as expected. Furthermore, S. hyodysenteriae reference strain P18A differed from all the other spirochaetes tested and had a higher number of flagella (8-12) at each cell end and was strongly beta-haemolytic. To the best of our knowledge, this is the first report on the detection of a band of extrachromosomal DNA having the same size in w beta HIS and S. pilosicoli from swine origin.
authors.affiliation: Institute of Microbiology, Faculty of Medicine and Surgery, University of Parma, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Calderaro
authors.forename: P
authors.initials: P
authors.lastname: Cattani
authors.forename: G
authors.initials: G
authors.lastname: Dettori
authors.forename: P
authors.initials: P
authors.lastname: Ragni
authors.forename: R
authors.initials: R
authors.lastname: Grillo
authors.forename: R
authors.initials: R
authors.lastname: Guégan
authors.forename: G
authors.initials: G
authors.lastname: Fadda
authors.forename: C
authors.initials: C
authors.lastname: Chezzi
mesh_terms: D000818:Animals; D015373:Bacterial Typing Techniques; D017400:Brachyspira / Q000145:classification / Q000235:genetics*; D017401:Brachyspira hyodysenteriae / Q000145:classification / Q000235:genetics; D004269:DNA, Bacterial / Q000302:isolation & purification*; D004587:Electrophoresis, Agar Gel; D005111:Extrachromosomal Inheritance; D006461:Hemolysis; D006801:Humans; D007422:Intestines / Q000382:microbiology*; D013142:Spirochaeta / Q000145:classification / Q000235:genetics*; D013145:Spirochaetales Infections / Q000382:microbiology* / Q000662:veterinary; D013552:Swine; D013553:Swine Diseases / Q000382:microbiology
chemical_list: D004269:DNA, Bacterial