Document Detail

Involvement of Manayunkia speciosa (Annelida: Polychaeta: Sabellidae) in the life cycle of Parvicapsula minibicornis, a myxozoan parasite of Pacific salmon.
MedLine Citation:
PMID:  16995391     Owner:  NLM     Status:  MEDLINE    
A coelomic myxozoan infection was detected in freshwater polychaetes, Manayunkia speciosa from the Klamath River, Oregon/California, a site enzootic for the myxozoan parasites Ceratomyxa shasta and Parvicapsula minibicornis. The tetractinomyxon type actinospores had a near-spherical spore body 7.9 x 7.1 microm, with 3 spherical, protruding polar capsules, no valve cell processes, and a binucleate sporoplasm. Parvicapsula minibicornis-specific primers Parvi1f and Parvi2r amplified DNA from infected polychaetes in a polymerase chain reaction (PCR) assay. The small subunit 18S rRNA gene of the spores was sequenced (GenBank DQ231038) and was a 99.7% match with the sequence for P. minibicornis myxospore stage in GenBank (AF201375). Chinook salmon (Oncorhynchus tshawytscha) exposed to a dose of 1,000 actinospores per fish tested PCR positive for P. minibicornis at 14 wk postinfection and presporogonic stages were detected in the kidney tubules by histology at 20 wk. This life cycle is 1 of only about 30 known from more than 1,350 myxozoan species, and only the second known from a freshwater polychaete.
Jerri L Bartholomew; Stephen D Atkinson; Sascha L Hallett
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  The Journal of parasitology     Volume:  92     ISSN:  0022-3395     ISO Abbreviation:  J. Parasitol.     Publication Date:  2006 Aug 
Date Detail:
Created Date:  2006-09-25     Completed Date:  2006-09-28     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  7803124     Medline TA:  J Parasitol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  742-8     Citation Subset:  IM    
Center for Fish Disease Research, Department of Microbiology, Nash Hall 220, Oregon State University, Corvallis, Oregon 97331, USA.
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MeSH Terms
Base Sequence
DNA, Protozoan / chemistry
Eukaryota / genetics,  growth & development*,  physiology
Fish Diseases / parasitology*,  transmission
Life Cycle Stages / physiology*
Molecular Sequence Data
Polychaeta / parasitology*
Polymerase Chain Reaction / veterinary
Protozoan Infections, Animal / parasitology*,  transmission
RNA, Ribosomal, 18S / genetics
Salmon / parasitology*
Spores, Protozoan / genetics,  physiology,  ultrastructure
Reg. No./Substance:
0/DNA, Protozoan; 0/RNA, Ribosomal, 18S

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