A simple and efficient method for purification of prawn baculovirus DNA

Area of Science:

• Aquaculture Virology
• Molecular Biology Techniques
• Crustacean Pathogen Research

Background:

• Prawn aquaculture faces significant losses due to viral diseases.
• Efficient isolation and characterization of prawn viruses are crucial for disease management.
• Existing methods for baculovirus DNA extraction are often complex and time-consuming.

Purpose of the Study:

• To develop a simplified and effective method for isolating prawn baculovirus.
• To establish a protocol for extracting intact viral DNA from the isolated virus.
• To characterize the morphology and DNA of a newly identified prawn baculovirus.

Main Methods:

• Developed a new isolation protocol avoiding density gradient centrifugation and ultracentrifugation.
• Utilized Phenylmethylsulfonyl fluoride (PMSF), DNase, and RNase for sample preparation.
• Employed guanidine hydrochloride and proteinase K for nucleocapsid lysis and protein degradation.
• Transmission electron microscopy (TEM) for virion morphology assessment.
• Restriction endonuclease digestion and agarose gel electrophoresis for viral DNA analysis.

Main Results:

• Successfully isolated prawn baculovirus with a simplified protocol.
• Obtained intact viral DNA by lysing nucleocapsids and degrading proteins.
• Transmission electron microscopy revealed bacilliform virions (58-62 nm width, 300-350 nm length).
• Agarose gel electrophoresis showed clear restriction fragments of viral DNA.
• Estimated viral DNA size at approximately 290 kb.
• Identified and named the virus Prawn White Spot Baculovirus (PWSBV).

Conclusions:

• The developed method provides an efficient and accessible approach for prawn baculovirus isolation and DNA extraction.
• The characterization of PWSBV contributes to understanding viral pathogens affecting prawns.
• This protocol facilitates further research into PWSBV pathogenesis and control strategies.