title: Genotyping Toxoplasma gondii from wildlife in Pennsylvania and identification of natural recombinants virulent to mice.
abstract: Recent studies indicated the predominance of Toxoplasma gondii haplogroup 12 in wildlife in the USA. However, still little is known of the genetic diversity of this parasite circulating in wildlife. In the present study, we tested coyotes (Canis latrans), red foxes (Vulpes vulpes), white-tailed deer (Odocoileus virginianus), and geese (Branta canadensis) from the state of Pennsylvania for T. gondii infection. Antibodies to T. gondii were found in 160 of 367 animals, including 92 (34.5%) of 266 coyotes, 49 (62.0%) of 79 white-tailed deer, 17 (85.0%) of 20 red fox, and two of two Canada geese tested by the modified agglutination test (cut off titer 1:25). Tissues from 105 seropositive animals were bioassayed in mice, and viable T. gondii was isolated from 29 animals, including 10 of 53 coyotes, 11 of 16 foxes, 7 of 49 deer, and one of one goose. DNA isolated from culture-derived tachyzoites of these isolates was characterized initially using multilocus PCR-RFLP markers. Nine genotypes were revealed, including ToxoDB PCR-RFLP #1 (4 isolates), #2 (2 isolates), #3 (4 isolates), #4 (6 isolates), #5 (4 isolates), #54 (1 isolate), #141 (1 isolate), #143 (1 isolate), and #216 (6 isolates), indicating high genetic diversity of T. gondii in wildlife in Pennsylvania. Pathogenicity of six T. gondii isolates (5 of #216 and #141) was determined in outbred Swiss Webster mice. Three of #216 and the #141 isolates were acute virulent to mice, and the other 2 #216 isolates were intermediate virulent. To determine the extent of genetic variation of these as well as a few recently reported virulent isolates from wildlife in North America, intron sequences were generated. Analysis of intron sequences and PCR-RFLP genotyping results indicated that the #216 isolates are likely derived from recombination of the clonal type I and III lineages. To determine if T. gondii virulence can be predicted by typing, we genotyped a collection of strains using PCR-RFLP markers for polymorphic genes ROP5, ROP16, ROP18 and GRA15, which are known to interact with host immune response. The results showed that there is an association of genotypes of ROP5 and ROP18 with mouse-virulence, however, additional gene(s) may also contribute to virulence in distinct T. gondii genotypes.
authors: United States Department of Agriculture, Agricultural Research Service, Beltsville Agricultural Research Center, Animal Parasitic Diseases Laboratory, Building 1001, Beltsville, MD 20705-2350, USA. Electronic address: Jitender.dubey@ars.usda.gov.
authors: J P
authors: JP
authors: Dubey
authors: United States Department of Agriculture, Animal Plant Health Inspection Service, Wildlife Services, Harrisburg, PA 17106-0827, USA.
authors: K
authors: K
authors: Van Why
authors: United States Department of Agriculture, Agricultural Research Service, Beltsville Agricultural Research Center, Animal Parasitic Diseases Laboratory, Building 1001, Beltsville, MD 20705-2350, USA.
authors: S K
authors: SK
authors: Verma
authors: United States Department of Agriculture, Agricultural Research Service, Beltsville Agricultural Research Center, Animal Parasitic Diseases Laboratory, Building 1001, Beltsville, MD 20705-2350, USA.
authors: S
authors: S
authors: Choudhary
authors: United States Department of Agriculture, Agricultural Research Service, Beltsville Agricultural Research Center, Animal Parasitic Diseases Laboratory, Building 1001, Beltsville, MD 20705-2350, USA.
authors: O C H
authors: OC
authors: Kwok
authors: Department of Molecular Microbiology, Washington University School of Medicine, 660 S. Euclid Avenue, St. Louis, MO 63110, USA.
authors: A
authors: A
authors: Khan
authors: Department of Molecular Microbiology, Washington University School of Medicine, 660 S. Euclid Avenue, St. Louis, MO 63110, USA.
authors: M S
authors: MS
authors: Behinke
authors: Department of Molecular Microbiology, Washington University School of Medicine, 660 S. Euclid Avenue, St. Louis, MO 63110, USA.
authors: L D
authors: LD
authors: Sibley
authors: United States Department of Agriculture, Agricultural Research Service, Beltsville Agricultural Research Center, Animal Parasitic Diseases Laboratory, Building 1001, Beltsville, MD 20705-2350, USA.
authors: L R
authors: LR
authors: Ferreira
authors: United States Department of Agriculture, Agricultural Research Service, Beltsville Agricultural Research Center, Animal Parasitic Diseases Laboratory, Building 1001, Beltsville, MD 20705-2350, USA.
authors: S
authors: S
authors: Oliveira
authors: Department of Biology, College of Arts and Sciences, Shippensburg University, Shippensburg, PA 17257, USA.
authors: M
authors: M
authors: Weaver
authors: Department of Biology, College of Arts and Sciences, Shippensburg University, Shippensburg, PA 17257, USA.
authors: R
authors: R
authors: Stewart
authors: Department of Microbiology, The University of Tennessee, Knoxville, TN 37996-0845, USA.
authors: C
authors: C
authors: Su
mesh_terms: D000818:Animals; D000835:Animals, Wild / Q000469:parasitology*; D000913:Antibodies, Protozoan / Q000097:blood; D016054:DNA, Protozoan / Q000235:genetics*; D014644:Genetic Variation; D005838:Genotype; D051379:Mice; D010414:Pennsylvania / Q000453:epidemiology; D015995:Prevalence; D011995:Recombination, Genetic; D014122:Toxoplasma / Q000235:genetics* / Q000472:pathogenicity*; D014124:Toxoplasmosis, Animal / Q000453:epidemiology / Q000469:parasitology*
chemical_list: D000913:Antibodies, Protozoan; D016054:DNA, Protozoan
keywords: Genotyping; Isolation; Pennsylvania; Seroprevalence; Toxoplasma gondii; USA; Wildlife