Document Detail

Sporogony of Tetracapsuloides bryosalmonae in the brown trout Salmo trutta and the role of the tertiary cell during the vertebrate phase of myxozoan life cycles.
MedLine Citation:
PMID:  18549518     Owner:  NLM     Status:  MEDLINE    
Tetracapsuloides bryosalmonae is the myxozoan that causes the commercially and ecologically important proliferative kidney disease of salmonid fish species. Immunohistochemistry and electron microscopy were used to examine the development of this parasite within the kidney of the brown trout Salmo trutta. The main replicative phase of T. bryosalmonae is a cell doublet composed of a primary cell and a single secondary cell. Engulfment of one secondary cell by another to form a secondary-tertiary doublet (S-T doublet) heralded the onset of sporogony whereupon the parasite migrated to the kidney tubule lumen. Within the tubule, the parasite transformed into a pseudoplasmodium and anchored to the tubule epithelial cells via pseudopodial extensions. Within each pseudoplasmodium developed a single spore, composed of 4 valve cells, 2 polar capsules and 1 sporoplasm. The pseudoplasmodia formed clusters suggesting that large numbers of spores develop within the fish. This examination of T. bryosalmonae suggests that the main replicative phase of freshwater myxozoans within vertebrates is via direct replication of cell doublets rather than through the rupturing of extrasporogonic stages, while tertiary cell formation relates only to sporogony. Taken in conjunction with existing phylogenetic data, 5 distinct sporogonial sequences are identified for the Myxozoa.
D J Morris; A Adams
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-06-13
Journal Detail:
Title:  Parasitology     Volume:  135     ISSN:  1469-8161     ISO Abbreviation:  Parasitology     Publication Date:  2008 Aug 
Date Detail:
Created Date:  2008-08-12     Completed Date:  2009-06-09     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401121     Medline TA:  Parasitology     Country:  England    
Other Details:
Languages:  eng     Pagination:  1075-92     Citation Subset:  IM    
Institute of Aquaculture, University of Stirling, Stirling FK9 4LA, Scotland, UK.
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MeSH Terms
Fish Diseases / parasitology*
Kidney Tubules / parasitology
Life Cycle Stages
Microscopy, Electron, Transmission
Myxozoa / growth & development*
Spores, Protozoan / growth & development
Trout / parasitology*
Grant Support
BCC 5050421//Biotechnology and Biological Sciences Research Council

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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