Previous Article | Next Article ![]()
Journal of Clinical Microbiology, 09 1996, 2058-2065, Vol 34, No. 9
V Roux, PE Fournier and D Raoult
Currently, the genotypic identification of the spotted fever group (SFG)
rickettsiae is based on restriction fragment length polymorphism analysis
of PCR-amplified genes coding for the enzyme citrate synthase and the
surface proteins rOmpA and rOmpB. A set of useful restriction endonucleases
was found following comparison of Rickettsia rickettsii and R. prowazekii
sequences. However, by using three PCR amplifications and four enzyme
digestions with this set, it was impossible to differentiate between all of
the known serotypes of the SFG rickettsiae. We amplified by PCR and
sequenced using an automated laser fluorescent DNA sequencer a fragment of
the gene encoding the protein rOmpA from 21 serotypes of the SFG
rickettsiae. A 632-bp amplification product was obtained for most of the
strains, although no product could be obtained by using R. akari, R.
australis, R. helvetica, and R. bellii DNAs. We found a characteristic
sequence for all strains studied except the two isolates of R. massiliae,
isolates GS and Mtul. Using the software package BISANCE, we determined the
restriction map of this fragment and identified five potentially useful
endonucleases, RsaI, AluI, PstI, XbaI, and AvaII. We confirmed the computer
analysis-derived profiles by PCR-restriction fragment length polymorphism
analysis. The combination of the profiles obtained after digestion of the
PCR product by RsaI and PstI allowed for the differentiation of 16 strains.
The use of AluI and XbaI allowed for the characterization of R. parkeri and
strain HA-91, respectively. R. africae and strain S were differentiated by
AvaII digestion. Thus, using a single PCR amplification, we were able to
differentiate all of the SFG rickettsiae whose ompA gene was amplified by
PCR.
Copyright © 1996 by the American Society for Microbiology. All rights reserved.
Differentiation of spotted fever group rickettsiae by sequencing and analysis of restriction fragment length polymorphism of PCR-amplified DNA of the gene encoding the protein rOmpA
Unite des Rickettsies, Faculte de Medecine, Centre National de la Recherche Scientifique EPJ 0054, Marseille, France.
This article has been cited by other articles:
Copyright © 2009 by the American Society for Microbiology. For an alternate route to Journals.ASM.org, visit: http://intl-journals.asm.org | More Info»