Abstract:
AIMS:This study was conducted to clarify the taxonomic status of Francisella sp. strain Ehime-1, a fish pathogen, in relation to the fish pathogens F. piscicida and F. philomiragia subsp. noatunensis and to F. philomiragia subsp. philomiragia. METHODS AND RESULTS:Francisella sp. Ehime-1 was compared to F. piscicida, F. philomiragia subsp. noatunensis and several F. philomiragia subsp. philomiragia isolates through sequencing of the 16S rRNA-gene and several house-keeping genes and determination of biochemical and phenotypic properties. Results show that F. piscicida is indistinguishable from F. philomiragia subsp. noatunensis by sequence and phenotypic traits. Francisella sp. Ehime-1 and F. philomiragia subsp. noatunensis are clearly separated from F. philomiragia. Francisella sp. Ehime-1 is biochemically, phenotypically and genetically different from F. philomiragia subsp. noatunensis (=F. piscicida), but DNA-DNA hybridization does not clearly support establishment as a separate species (level of relatedness 64% and 73.4%, mean 68.7%). CONCLUSIONS:We propose to elevate F. philomiragia subsp. noatunensis to species rank as F. noatunensis comb. nov., while F. piscicida is considered a heterotypic synonym of F. noatunensis comb. nov. Evidence suggests that Francisella sp. Ehime-1 represents a novel subspecies of F. noatunensis, for which the name F. noatunensis subsp. orientalis subsp. nov. is proposed (=DSM21254(T), = LMG24544(T)). SIGNIFICANCE AND IMPACT OF THE STUDY:This study contributes to the taxonomy and characteristics of fish-pathogenic Francisella spp.
journal_name
J Appl Microbioljournal_title
Journal of applied microbiologyauthors
Ottem KF,Nylund A,Karlsbakk E,Friis-Møller A,Kamaishi Tdoi
10.1111/j.1365-2672.2008.04092.xsubject
Has Abstractpub_date
2009-04-01 00:00:00pages
1231-43issue
4eissn
1364-5072issn
1365-2672pii
JAM4092journal_volume
106pub_type
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