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Betanodaviruses, the causative agents of viral nervous necrosis in marine fish, have bipartite positive-sense RNA genomes and have been classified (based on analysis of RNA2 sequences) into 4 genotypes: tiger puffer nervous necrosis virus (TPNNV), barfin flounder nervous necrosis virus (BFNNV), striped jack nervous necrosis virus (SJNNV), and redspotted grouper nervous necrosis virus (RGNNV). Full-length genomes of TPNNV and BFNNV were sequenced for the first time in this study. Their sequence data and those of SJNNV and RGNNV retrieved from GenBank were compared in order to investigate the relationships among the 4 genotypes. Between TPNNV and BFNNV, sequence identities were relatively high in RNA1 and encoded Protein A, but were not significantly high in RNA2 or the coat protein (CP). Similarly, between BFNNV and RGNNV, the amino acid sequences of CP were highly similar, but identities of RNA1, RNA2, and Protein A sequences were not especially high. Furthermore, multiple alignment data of the 4 genotypes of RNA2 sequences revealed that the TPNNV and SJNNV sequences have the same sizes of gaps and extra sequences at the same positions. Collectively, these apparent contradictions in sequence identity suggest that betanodavirus genomes have been constructed via complex evolutionary processes.

Comparisons among the complete genomes of four betanodavirus genotypes