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DAO 61:33-39 (2004)
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Abstract
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Characterization of the 23S and 5S rRNA genes and 23S-5S intergenic spacer region (ITS-2) of Photobacterium damselae
Carlos R. Osorio1,*, Matthew D. Collins2, Jesús L. Romalde1, Alicia E. Toranzo1
1Departamento de Microbioloxía e Parasitoloxía e Instituto de Acuicultura,Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Galicia, Spain
2School of Food Biosciences, University of Reading, PO Box 226, Whiteknights, Reading RG6 6AP, UK
*Email: crosorio@usc.es
ABSTRACT: The 23S ribosomal RNA (rRNA) gene has been sequenced in strains of the fish pathogens Photobacterium damselae subsp. damselae (ATCC 33539) and subsp. piscicida (ATCC 29690), showing that 3 nucleotide positions are clearly
different between subspecies. In addition, the 5S rRNA gene plus the intergenic spacer region between the 23S and 5S rRNA genes (ITS-2) were amplified, cloned and sequenced for the 2 reference strains as well as the field isolates RG91 (subsp.
damselae) and DI21 (subsp. piscicida). A 100% similarity was found for the consensus 5S rRNA gene sequence in the 2 subspecies, although some microheterogeneity was detected as inter-cistronic variability within the same chromosome. Sequence
analysis of the spacer region between the 23S and 5S rRNA genes revealed 2 conserved and 3 variable nucleotide sequence blocks, and 4 different modular organizations were found. The ITS-2 spacer region exhibited both inter-subspecies and inter-cistronic
polymorphism, with a mosaic-like structure. The EMBL accession numbers for the 23S, 5S and ITS-2 sequences are: P. damselae subsp. piscicida 5S gene (AJ274379), P. damselae subsp. damselae 23S gene (Y18520), subsp.
piscicida 23S gene (Y17901), P. damselae subsp. piscicida ITS-2 (AJ250695, AJ250696), P. damselae subsp. damselae ITS-2 (AJ250697, AJ250698).
KEY WORDS: 23S · 5S · ITS-2 · Photobacterium damselae · Intergenic spacers
Full text in pdf format
Published in DAO Vol.
61, No. 1-2
(2004) on October 21
Print ISSN: 0177-5103; Online ISSN: 1616-1580.
Copyright © Inter-Research, Oldendorf/Luhe, 2004
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