1887

Abstract

The nucleotide sequence of the nucleopolyhedrovirus (EppoMNPV) genome has been determined and analysed. The circular dsDNA genome contains 118584 bp, making it the smallest group I NPV sequenced to date. The genome has a G+C content of 40·7% and encodes 136 predicted open reading frames (ORFs), five homologous repeat regions and one unique repeat region. Of the genome, 92·9% encodes predicted ORFs and 2·2% is in repeat regions; the remaining 4·9% of the genome comprises nonrepeat intergenic regions. EppoMNPV encodes homologues of 126 MNPV (OpMNPV) ORFs and 120 MNPV ORFs, with average identities of 64·7 and 53·5%, respectively. Between the four sequenced group I NPVs, 117 ORFs are conserved, whereas 86 ORFs are conserved between all fully sequenced NPVs. A total of 62 ORFs is present in all baculoviruses sequenced to date, with EppoMNPV lacking a homologue of the superoxide dismutase () gene, which has been found in all other fully sequenced baculoviruses. Whole genome phylogenetic analyses of the ten fully sequenced baculoviruses using the sequences of the 62 shared genes, gene content and gene order data sets confirmed that EppoMNPV clusters tightly with OpMNPV in the group I NPVs. The main variation between EppoMNPV and OpMNPV occurs where extra clusters of genes are present in OpMNPV, with occurring in one such cluster. EppoMNPV encodes one truncated baculovirus repeated ORF () gene. The only repeated ORFs are the four genes. Eight, randomly distributed, unique ORFs were identified on EppoMNPV, none of which show any significant homology to genes in GenBank.

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2002-04-01
2020-09-21
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