Characterization of "Candidatus Piscichlamydia salmonis" (Order Chlamydiales), a chlamydia-like bacterium associated with epitheliocystis in farmed atlantic salmon (Salmo solar)

Andrew Draghi, Vsevolod Popov, Melissa M. Kahl, James B. Stanton, Corrie C. Brown, Gregory J. Tsongalis, A. Brian West, Salvatore Frasca

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Abstract

To characterize intracellular gram-negative bacteria associated with epitheliocystis in farmed Atlantic salmon (Salmo salar), gills with proliferative lesions were collected for histopathology, conventional transmission and immunoelectron microscopy, in situ hybridization, and DNA extraction during epitheliocystis outbreaks in Ireland and Norway in 1999 and 2000, respectively, and compared by ultrastructure and immunoreactivity to nonproliferative gills from Ireland archived in 1995. Genomic DNA from proliferative gills was used to amplify 16S ribosomal DNA (rDNA) for molecular phylogenetic analyses. Epitheliocystis inclusions from proliferative gills possessed variably elongate reticulate bodies, examples of binary fission, and vacuolated and nonvacuolated intermediate bodies, whereas inclusions in nonproliferative gills had typical chlamydial developmental stages plus distinctive head-and-tail cells. Immunogold processing using anti-chlamydial lipopolysaccharide antibody labeled reticulate bodies from proliferative and nonproliferative gills. 16S rDNA amplified directly from Irish (1999) and Norwegian (2000) gill samples demonstrated 99% nucleotide identity, and riboprobes transcribed from cloned near-full-length 16S rDNA amplicons from Norwegian gills hybridized with inclusions in proliferative lesions from Irish (1999) and Norwegian (2000) sections. A 1,487-bp consensus 16S rRNA gene sequence representing the chlamydia-like bacterium (CLB) from proliferative gills had the highest percent nucleotide identity with endosymbionts of Acanthamoeba spp. (order Chlamydiales). Molecular phylogenetic relationships inferred from 16S rRNA gene sequences using distance and parsimony indicated that the CLB from proliferative gills branched with members of the order Chlamydiales. "Candidatus Piscichlamydia salmonis" is proposed for the CLB associated with epitheliocystis from proliferative gills of Atlantic salmon, which exhibits developmental stages different from those identified in nonproliferative gills.

Original languageEnglish (US)
Pages (from-to)5286-5297
Number of pages12
JournalJournal of Clinical Microbiology
Volume42
Issue number11
DOIs
StatePublished - Nov 2004

Fingerprint

Chlamydiales
Salmo salar
Chlamydia
Bacteria
Ribosomal DNA
rRNA Genes
Ireland
Nucleotides
Acanthamoeba
Immunoelectron Microscopy
DNA
Inclusion Bodies
Norway

ASJC Scopus subject areas

  • Microbiology (medical)
  • Microbiology

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Characterization of "Candidatus Piscichlamydia salmonis" (Order Chlamydiales), a chlamydia-like bacterium associated with epitheliocystis in farmed atlantic salmon (Salmo solar). / Draghi, Andrew; Popov, Vsevolod; Kahl, Melissa M.; Stanton, James B.; Brown, Corrie C.; Tsongalis, Gregory J.; West, A. Brian; Frasca, Salvatore.

In: Journal of Clinical Microbiology, Vol. 42, No. 11, 11.2004, p. 5286-5297.

Research output: Contribution to journalArticle

Draghi, Andrew ; Popov, Vsevolod ; Kahl, Melissa M. ; Stanton, James B. ; Brown, Corrie C. ; Tsongalis, Gregory J. ; West, A. Brian ; Frasca, Salvatore. / Characterization of "Candidatus Piscichlamydia salmonis" (Order Chlamydiales), a chlamydia-like bacterium associated with epitheliocystis in farmed atlantic salmon (Salmo solar). In: Journal of Clinical Microbiology. 2004 ; Vol. 42, No. 11. pp. 5286-5297.
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abstract = "To characterize intracellular gram-negative bacteria associated with epitheliocystis in farmed Atlantic salmon (Salmo salar), gills with proliferative lesions were collected for histopathology, conventional transmission and immunoelectron microscopy, in situ hybridization, and DNA extraction during epitheliocystis outbreaks in Ireland and Norway in 1999 and 2000, respectively, and compared by ultrastructure and immunoreactivity to nonproliferative gills from Ireland archived in 1995. Genomic DNA from proliferative gills was used to amplify 16S ribosomal DNA (rDNA) for molecular phylogenetic analyses. Epitheliocystis inclusions from proliferative gills possessed variably elongate reticulate bodies, examples of binary fission, and vacuolated and nonvacuolated intermediate bodies, whereas inclusions in nonproliferative gills had typical chlamydial developmental stages plus distinctive head-and-tail cells. Immunogold processing using anti-chlamydial lipopolysaccharide antibody labeled reticulate bodies from proliferative and nonproliferative gills. 16S rDNA amplified directly from Irish (1999) and Norwegian (2000) gill samples demonstrated 99{\%} nucleotide identity, and riboprobes transcribed from cloned near-full-length 16S rDNA amplicons from Norwegian gills hybridized with inclusions in proliferative lesions from Irish (1999) and Norwegian (2000) sections. A 1,487-bp consensus 16S rRNA gene sequence representing the chlamydia-like bacterium (CLB) from proliferative gills had the highest percent nucleotide identity with endosymbionts of Acanthamoeba spp. (order Chlamydiales). Molecular phylogenetic relationships inferred from 16S rRNA gene sequences using distance and parsimony indicated that the CLB from proliferative gills branched with members of the order Chlamydiales. {"}Candidatus Piscichlamydia salmonis{"} is proposed for the CLB associated with epitheliocystis from proliferative gills of Atlantic salmon, which exhibits developmental stages different from those identified in nonproliferative gills.",
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