Journal
DISEASES OF AQUATIC ORGANISMS
Volume 71, Issue 3, Pages 267-272Publisher
INTER-RESEARCH
DOI: 10.3354/dao071267
Keywords
IHNV; fish rhabdovirus; glycoprotein gene; phylogenetic relatedness; evolution
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Infectious hematopoietic necrosis virus (IHNV), a member of the genus Novirhabdovirus, causes a highly lethal disease of salmonid fish. In the present study, G gene nucleotide sequences of 9 Japanese IHNV isolates obtained from 1971 to 1996 were analyzed to evaluate the genetic diversity and compared with IHNV isolates from North America and Europe. A radial phylogenetic tree revealed 5 major clusters including 3 genogroups (U, M and L) for North American isolates and 1 genogroup for European isolates. Five Japanese isolates from 1971 to 1982 appeared in the cluster for genogroup U, while the remaining Japanese isolates from 1980 to 1996 formed a new genogroup, JRt (Japanese rainbow trout). Maximum nucleotide diversity among the Japanese isolates was 4.5 %, which was greater than that within the North American isolates (3.6 %), and the degree of nucleotide diversity within Japanese isolates was increased by inclusion of the genogroup JRt isolates. It was concluded that Japanese isolates shared a common source with the genogroup, U of the North American isolates and that there were large divergences between Japanese isolates before and after the 1980s.
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