Related Experiment Videos
Monodon baculovirus from Australia: ultrastructural observations.
J E Vickers1, R Webb, P R Young
1Department of Microbiology, University of Queensland, Brisbane, Australia. joan.vickers@tag.csiro.au
Diseases of Aquatic Organisms
|April 18, 2000
Summary
New findings reveal previously undescribed structures in monodon baculovirus (MBV) replication within shrimp. These electron-dense nucleocapsids clarify how the viral genome reaches the nucleus, completing our understanding of MBV pathogenesis.
Area of Science:
- * Aquatic animal pathology
- * Molecular virology
- * Crustacean disease
Background:
- * Monodon baculovirus (MBV) is a significant pathogen affecting Penaeus monodon (black tiger shrimp).
- * Previous studies have described aspects of MBV replication, but gaps remained in understanding its complete lifecycle, particularly genome transport.
- * Ultrastructural details of MBV infection in Australian Penaeus monodon were not fully elucidated.
Purpose of the Study:
- * To describe the cytopathology, virogenesis, and replication of MBV in Australian Penaeus monodon.
- * To identify and characterize novel viral structures.
- * To elucidate the mechanism of viral genome transport to the nucleus.
Main Methods:
- * Transmission electron microscopy was used to examine infected hepatopancreatocytes.
- * Ultrastructural analysis focused on viral particle morphology and location within host cells.
- * A model for MBV virogenesis and replication was developed based on new and existing data.
Main Results:
- * Electron-dense, unenveloped nucleocapsids were observed in the cytoplasm and attached to the nuclear envelope, a novel finding for MBV.
- * These nucleocapsids provide evidence for the pathway of viral genome transport from the cell membrane to the nucleus.
- * Additional previously unreported features, such as empty capsids at nuclear pores and internal filaments, were documented.
Conclusions:
- * The discovery of unenveloped nucleocapsids fills a critical gap in the understanding of MBV replication.
- * The findings present a comprehensive model for MBV virogenesis and replication in Penaeus monodon.
- * This research enhances knowledge of baculovirus pathogenesis in commercially important shrimp species.