Mouse polyomavirus infection induces lamin reorganisation

Area of Science:

• Cell Biology
• Virology
• Structural Biology

Background:

• The nuclear lamina, a protein network beneath the inner nuclear membrane, provides structural support to the nucleus.
• Lamins, particularly A-type lamins (lamin A/C), are key components of the nuclear lamina and are involved in nuclear organization and gene regulation.
• Viruses that replicate within the cell nucleus must interact with the nuclear envelope and lamina during their replication cycle.

Purpose of the Study:

• To investigate the role of the nuclear lamina and its components, specifically lamin A/C, in the replication of mouse polyomavirus, a double-stranded DNA virus.
• To understand how viral infection affects the nuclear lamina structure and composition.

Main Methods:

• Immunofluorescence microscopy to detect viral proteins (VP1) and nuclear lamins (lamin A/C) distribution.
• Analysis of nuclear lamina integrity and lamin A/C phosphorylation patterns during viral infection.
• Assessment of viral replication complex formation and propagation in the presence and absence of lamin A/C.

Main Results:

• Mouse polyomavirus infection led to VP1 accumulation at the nuclear periphery and altered lamin A/C staining and phosphorylation.
• The nuclear envelope integrity was maintained despite observed changes in the nuclear lamina.
• Absence of lamin A/C did not impede replication complex formation but resulted in slower virus propagation.

Conclusions:

• The nuclear lamina serves as a scaffold for viral replication complex assembly.
• Lamin A/C plays a significant role in the early stages of mouse polyomavirus infection, influencing viral propagation.
• These findings highlight a critical interaction between the host nuclear lamina and viral replication machinery.