Summary auto-generated
This study characterizes the genome organization of Buzura suppressaria single-nucleocapsid nucleopolyhedrovirus (BusuNPV), a baculovirus used for biological control of tea plantation pests in China. Researchers constructed a detailed physical map of the 120.9 kbp viral genome using restriction enzyme analysis of nine different endonucleases and created a genomic library. Approximately 43.5 kbp of DNA was sequenced, revealing 52 putative open reading frames (ORFs) homologous to genes in other known baculoviruses. While BusuNPV shares similar gene content with other nucleopolyhedroviruses like AcMNPV and BmNPV, its gene arrangement along the genome is distinctly different. The researchers developed a novel computational visualization method called GeneParityPlot to compare gene ordering among baculoviruses. Analysis revealed that although certain gene clusters are conserved across baculovirus species, BusuNPV exhibits significant rearrangement of gene positions compared to closely related viruses. The conserved gene content but distinct gene arrangement suggests BusuNPV represents a separate species within the Nucleopolyhedrovirus genus and indicates that gene organization may serve as a useful phylogenetic marker for classifying baculoviruses.
Key findings
- BusuNPV genome is 120.9 kbp in size and contains 52 putative ORFs with similar gene content to other nucleopolyhedroviruses, including essential replication genes and auxiliary genes like egt, cathepsin, and chitinase
- Gene arrangement in BusuNPV is significantly different from AcMNPV, BmNPV, and OpMNPV despite high gene conservation, indicating distinct genome organization and supporting separate species status
- GeneParityPlot method was developed to visualize and compare gene order differences among baculoviruses when complete sequence information is limited
- Eight conserved gene clusters were identified that remain grouped across multiple baculovirus genomes despite rearrangement, suggesting functional constraints on certain genomic regions
- Amino acid sequence identity analysis shows BusuNPV genes have variable homology to other baculoviruses (28-84%), with differences potentially reflecting gene function and evolutionary distance
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Abstract
The genome organization of the Buzura suppressaria single-nucleocapsid nucleopolyhedrovirus (BusuNPV) was largely elucidated and compared to those of other baculoviruses. A detailed physical map was constructed for the restriction enzymes BamHI, BglI, BglII, EcoRI, HindIII, KpnI, PstI, XbaI and XhoI. The 120.9 kbp viral genome was cloned as restriction fragments into a plasmid library from which about 43.5 kbp of dispersed sequence information was generated. Fifty-two putative open reading frames homologous to those of other baculoviruses were identified and their location in the genome of BusuNPV was determined. Although the gene content of BusuNPV is similar to that of Autographa californica multiple-nucleocapsid nucleopolyhedrovirus, Bombyx mori nucleopolyhedrovirus and Orgyia pseudotsugata multiple-nucleocapsid nucleopolyhedrovirus, the gene order is, however, significantly different from that observed in the other viruses, which have a high degree of collinearity. A new approach (GeneParityPlot) was developed to represent the differences in gene order among baculoviruses when limited sequence information is available and to take advantage of the high degree of gene conservation. The data obtained show that BusuNPV is a distinct baculovirus species and the analyses suggest that gene distribution along baculovirus genomes may be used as a phylogenetic marker.