Chromatin organization regulates viral egress dynamics

Area of Science:

• Cell Biology
• Virology
• Structural Biology

Background:

• DNA viruses induce nuclear viral replication compartments.
• Chromatin is marginalized during viral infection.
• Herpes simplex virus 1 (HSV-1) nuclear egress is not fully understood.

Purpose of the Study:

• To analyze chromatin organization during HSV-1 infection.
• To investigate the effect of chromatin changes on viral capsid transport.
• To understand the molecular mechanisms of HSV-1 nuclear egress.

Main Methods:

• Three-dimensional soft X-ray tomography.
• Confocal and electron microscopy.
• Numerical modeling of capsid diffusion.

Main Results:

• HSV-1 infection leads to heterochromatin enrichment and compaction at the nuclear periphery.
• Compacted peripheral chromatin restricts the diffusion of viral capsids.
• Interchromatin channels facilitate capsid transport to the nuclear envelope.

Conclusions:

• Chromatin reorganization is a key feature of HSV-1 infection.
• Nuclear chromatin structure influences viral capsid egress.
• Interchromatin channels are crucial for HSV-1 nuclear egress.