title: Detection and strain differentiation of Chlamydia psittaci mediated by a two-step polymerase chain reaction.
abstract: Specific and sensitive amplification of major outer membrane protein (MOMP) gene DNA sequences of Chlamydia psittaci was achieved in a two-step polymerase chain reaction. First, oligonucleotide primers specific for 5' and 3' nontranslated regulatory regions of the MOMP gene were used in a polymerase chain reaction to amplify a DNA fragment of approximately 1,400 bp. A portion of this DNA fragment was amplified in a second reaction using a degenerate oligonucleotide primer specific for a DNA sequence contained within the 1,400-bp DNA fragment and one of the first-step primers. This method detected 10 cognate chlamydial genomes. C. psittaci MOMP genes from two avian strains and from mammalian serovars 1, 7, and 8 were amplified and analyzed by restriction endonuclease digestion. MOMP genes from mammalian serovars 2 through 6 and 9 and from strains of C. trachomatis and C. pneumoniae could not be amplified. Restriction endonuclease analysis with HaeIII indicated a close relationship between C. psittaci strains of avian and mammalian serovar 1 lineage, while those of mammalian serovars 7 and 8 exhibited distinct restriction patterns. DNA sequences corresponding to the mammalian serovar 1-wild type parakeet MOMP genotype of C. psittaci were detected in two of seven milk samples from cases of bovine mastitis.
authors.affiliation: Department of Veterinary Microbiology and Parasitology, School of Veterinary Medicine, Louisiana State University, Baton Rouge 70803.
authors.forename: B
authors.initials: B
authors.lastname: Kaltenboeck
authors.forename: K G
authors.initials: KG
authors.lastname: Kousoulas
authors.forename: J
authors.initials: J
authors.lastname: Storz
mesh_terms: D000818:Animals; D001425:Bacterial Outer Membrane Proteins / Q000235:genetics; D001483:Base Sequence; D002417:Cattle; D002691:Chlamydophila psittaci / Q000145:classification / Q000235:genetics / Q000302:isolation & purification*; D004269:DNA, Bacterial / Q000235:genetics; D005069:Evaluation Studies as Topic; D005260:Female; D005798:Genes, Bacterial; D008414:Mastitis, Bovine / Q000175:diagnosis / Q000382:microbiology; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction / Q000379:methods*; D009956:Psittacosis / Q000175:diagnosis; D013045:Species Specificity
chemical_list: D001425:Bacterial Outer Membrane Proteins; D004269:DNA, Bacterial