Identification and phylogenetic analysis of Dirofilaria ursi (Nematoda: Filarioidea) from Wisconsin black bears (Ursus americanus) and its Wolbachia endosymbiont.
Dirofilaria ursi is a filarial nematode of American black bears (Ursus americanus Pallas, 1780) that is vectored by black flies (Simuliidae) in many parts of the United States. In northwestern Wisconsin, the prevalence of microfilaremic bears during the fall hunting season was 21% (n = 47). Unsheathed blood microfilariae from Wisconsin bears possess characters consistent with the original description of D. ursi, as do adult worms observed histologically and grossly. Immunohistochemistry was used to identify the Wolbachia endosymbiont in the hypodermis and lateral cords of an adult female D. ursi. Amplification of wsp, gatB, coxA, fbpA, and ftsZ bacterial sequences from parasite DNA confirmed the presence of Wolbachia, and molecular phylogenetic analysis of the Wolbachia ftsZ gene groups the endosymbiont with Wolbachia from D. immitis and D. repens. Phylogenetic analysis of D. ursi 5s rDNA sequence confirms the morphological observations grouping this parasite as a member of Dirofilaria, and within the Dirofilaria - Onchocerca clade of filarial nematodes. This is the first report of Wolbachia characterization and molecular phylogeny information for D. ursi.
Michalski
Michelle L
ML
University of Wisconsin Oshkosh, Oshkosh, Wisconsin 54902, USA. michalsk@uwosh.edu
Bain
Odile
O
Fischer
Kerstin
K
Fischer
Peter U
PU
Kumar
Sanjay
S
Foster
Jeremy M
JM
D000818:Animals; D001425:Bacterial Outer Membrane Proteins / Q000235:genetics; D004269:DNA, Bacterial / Q000737:chemistry; D018509:DNA, Helminth / Q000737:chemistry; D004275:DNA, Ribosomal / Q000737:chemistry; D004182:Dirofilaria / Q000033:anatomy & histology / Q000145:classification* / Q000235:genetics / Q000382:microbiology; D004184:Dirofilariasis / Q000453:epidemiology / Q000469:parasitology*; D004285:Dogs; D005260:Female; D007150:Immunohistochemistry / Q000662:veterinary; D008297:Male; D008969:Molecular Sequence Data; D010802:Phylogeny; D016133:Polymerase Chain Reaction / Q000662:veterinary; D015995:Prevalence; D012341:RNA, Ribosomal, 5S / Q000235:genetics; D016415:Sequence Alignment / Q000662:veterinary; D013559:Symbiosis; D001503:Ursidae / Q000469:parasitology*; D014922:Wisconsin / Q000453:epidemiology; D020577:Wolbachia / Q000145:classification / Q000235:genetics / Q000502:physiology*
D001425:Bacterial Outer Membrane Proteins; D004269:DNA, Bacterial; D018509:DNA, Helminth; D004275:DNA, Ribosomal; D012341:RNA, Ribosomal, 5S; C112171:Wsp protein, Wolbachia