title: Dog shedding oocysts of Neospora caninum: PCR diagnosis and molecular phylogenetic approach.
abstract: Results of molecular determination of a dog isolate of Neospora caninum in the Czech Republic are presented. Colorless bisporocystic oocysts measuring 10-13 micro m x 10-11 micro m were recovered from feces and used for DNA isolation. A diagnostic PCR procedure using previously described molecular methods was performed to determine the species. The N. caninum species-specific primers based on the Nc 5 region produced a positive result, while primers specific for Hammondia heydorni rDNA internal transcribed spacer 1 (ITS1) was negative. Sequencing and phylogenetic comparison of ITS1 rDNA and the D2 domain of the large subunit rDNA (D2 LSU) determined our isolate to be N. caninum. Phylogenetic analysis of closely related genera Toxoplasma, Neospora and Hammondia based on ITS1 and D2 LSU robustly distinguished three clades: (i). Toxoplasma gondii + Hammondia hammondi, (ii). N. caninum + Neospora hughesi, and (iii). H. heydorni. Based on phylogenetic relationships we propose three acceptable suggestions to solve the problem of taxonomy of these genera.
authors.affiliation: Department of Parasitology, University of Veterinary and Pharmaceutical Sciences, Brno, Czech Republic. slapeta@wadsworth.org
authors.forename: Jan R
authors.initials: JR
authors.lastname: Slapeta
authors.forename: David
authors.initials: D
authors.lastname: Modrý
authors.forename: Iveta
authors.initials: I
authors.lastname: Kyselová
authors.forename: Radek
authors.initials: R
authors.lastname: Horejs
authors.forename: Julius
authors.initials: J
authors.lastname: Lukes
authors.forename: Bretislav
authors.initials: B
authors.lastname: Koudela
mesh_terms: D000818:Animals; D003044:Coccidia / Q000145:classification / Q000235:genetics; D003048:Coccidiosis / Q000175:diagnosis* / Q000469:parasitology*; D004275:DNA, Ribosomal / Q000032:analysis / Q000235:genetics; D004283:Dog Diseases / Q000175:diagnosis / Q000469:parasitology; D004285:Dogs / Q000469:parasitology*; D005243:Feces / Q000469:parasitology; D018688:Neospora / Q000145:classification / Q000235:genetics* / Q000302:isolation & purification*; D033661:Oocysts / Q000145:classification / Q000235:genetics / Q000302:isolation & purification; D010802:Phylogeny; D016133:Polymerase Chain Reaction; D013045:Species Specificity; D014122:Toxoplasma / Q000145:classification / Q000235:genetics
chemical_list: D004275:DNA, Ribosomal