How do animal DNA viruses get to the nucleus?

Area of Science:

• Virology
• Cell Biology
• Molecular Biology

Background:

• Most animal DNA viruses replicate within the host cell nucleus.
• Viral replication requires the transport of the viral genome into the nucleus using cellular import mechanisms.
• The precise mechanisms by which viral genomes reach the nucleus remain largely uncharacterized.

Purpose of the Study:

• To elucidate the process of nuclear targeting for infecting animal DNA virus genomes.
• To discuss the essential role of nuclear import in viral infection, latency, and transformation.
• To explore virion structure, life cycle, and nuclear import signals of viral proteins.

Main Methods:

• Review of virion structure and viral life cycles.
• Analysis of viral protein nuclear import signals.
• Discussion of viral genome nuclear targeting pathways.

Main Results:

• Viral genomes utilize the host cell's nuclear import machinery to enter the nucleus.
• Nuclear targeting is crucial for productive viral infection, latency, and transformation.
• Significant variation exists in the size and composition of infectious viral particles despite a common nuclear replication site.

Conclusions:

• Understanding viral genome nuclear targeting is key to comprehending viral pathogenesis.
• Further research is needed to fully delineate the nuclear import pathways for diverse animal DNA viruses.
• This review synthesizes current knowledge on virion components and their role in nuclear delivery.