| Paranucleospora theridion n. gen., n. sp. (Microsporidia, Enterocytozoonidae) with a Life Cycle in the Salmon Louse (Lepeophtheirus salmonis, Copepoda) and Atlantic Salmon (Salmo salar). | |
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MedLine Citation:
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PMID: 20070452 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Paranucleospora theridion n. gen, n. sp., infecting both Atlantic salmon (Salmo salar) and its copepod parasite Lepeophtheirus salmonis is described. The microsporidian exhibits nuclei in diplokaryotic arrangement during all known life-cycle stages in salmon, but only in the merogonal stages and early sporogonal stage in salmon lice. All developmental stages of P. theridion are in direct contact with the host cell cytoplasm or nucleoplasm. In salmon, two developmental cycles were observed, producing spores in the cytoplasm of phagocytes or epidermal cells (Cycle-I) and in the nuclei of epidermal cells (Cycle-II), respectively. Cycle-I spores are small and thin walled with a short polar tube, and are believed to be autoinfective. The larger oval intranuclear Cycle-II spores have a thick endospore and a longer polar tube, and are probably responsible for transmission from salmon to L. salmonis. Parasite development in the salmon louse occurs in several different cell types that may be extremely hypertrophied due to P. theridion proliferation. Diplokaryotic merogony precedes monokaryotic sporogony. The rounded spores produced are comparable to the intranuclear spores in the salmon in most aspects, and likely transmit the infection to salmon. Phylogenetic analysis of P. theridion partial rDNA sequences place the parasite in a position between Nucleospora salmonis and Enterocytozoon bieneusi. Based on characteristics of the morphology, unique development involving a vertebrate fish as well as a crustacean ectoparasite host, and the results of the phylogenetic analyses it is suggested that P. theridion should be given status as a new species in a new genus. |
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Authors:
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Stian Nylund; Are Nylund; Kuninori Watanabe; Carl E Arnesen; Egil Karlsbakk |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-01-11 |
Journal Detail:
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Title: The Journal of eukaryotic microbiology Volume: 57 ISSN: 1550-7408 ISO Abbreviation: J. Eukaryot. Microbiol. Publication Date: 2010 Mar-Apr |
Date Detail:
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Created Date: 2010-05-21 Completed Date: 2010-08-13 Revised Date: 2010-11-10 |
Medline Journal Info:
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Nlm Unique ID: 9306405 Medline TA: J Eukaryot Microbiol Country: United States |
Other Details:
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Languages: eng Pagination: 95-114 Citation Subset: IM |
Affiliation:
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Department of Biology, University of Bergen, 5020 Bergen, Norway. stian.nylund@bio.uib.no |
| Data Bank Information | |
Bank Name/Acc. No.:
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GENBANK/FJ389667; FJ594969; FJ594970; FJ594971; FJ594972; FJ594973; FJ594974; FJ594975; FJ594976; FJ594977; FJ594978; FJ594979; FJ594980; FJ594981; FJ594982; FJ594983; FJ594984; FJ594985; FJ594986; FJ594987; FJ594988; FJ594989; FJ594990 |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Apansporoblastina / classification*, genetics, growth & development*, isolation & purification Cell Nucleus / parasitology Copepoda / parasitology* Cytoplasm / parasitology DNA, Protozoan / chemistry, genetics DNA, Ribosomal / chemistry, genetics Epidermis / parasitology Epithelial Cells / parasitology Genes, rRNA Life Cycle Stages* Molecular Sequence Data Phagocytes / parasitology RNA, Protozoan / genetics RNA, Ribosomal, 18S / genetics Salmo salar / parasitology* Sequence Analysis, DNA Spores, Protozoan / cytology |
| Chemical | |
Reg. No./Substance:
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0/DNA, Protozoan; 0/DNA, Ribosomal; 0/RNA, Protozoan; 0/RNA, Ribosomal, 18S |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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