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ek1
trus1tin2
1 University of Ljubljana, Biotechnical Faculty, Biological Department, Ve
na pot 111, 1111 Ljubljana, Slovenia
2 University of Ljubljana, Biotechnical Faculty, Zootechnical Department, Groblje 3, 1230 Dom
ale, Slovenia
Correspondence
Gorazd Avgutin
gorazd.avgustin{at}bfro.uni-lj.si
Intracellular bacteria were observed in the hepatopancreas of the terrestrial isopod Porcellio scaber. Comparative 16S rRNA gene sequence analysis and electron microscopic observations were used to determine the taxonomic position of these intracellular bacteria. Phylogenetic analysis and a complex developmental cycle affiliate these bacteria to the order Chlamydiales, within which they form a distinctive lineage, close to the family Simkaniaceae. They share <92 % 16S rRNA gene sequence similarity with their closest relative and <88 % similarity with other members of the order Chlamydiales. A specific signature oligonucleotide sequence was identified and used as a probe, enabling the identification of intracellular bacteria in infected hepatopancreatic tissue. According to the distinctive morphology of their elementary bodies, which are rod-shaped rather than spherical and contain translucent oblong structures, their genomic properties and their crustacean host, the name ‘Candidatus Rhabdochlamydia porcellionis' is proposed for intracellular bacteria in the hepatopancreas of P. scaber.
Published online ahead of print on 7 November 2003 as DOI 10.1099/ijs.0.02802-0.
The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence determined in this study is AY223862.
Micrographs showing intracellular bacteria in infected hepatopancreatic cells of P. scaber are available as supplementary material in IJSEM Online.
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