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A groundbreaking study published in Nature Communications has uncovered a startling new mechanism by which the herpes simplex virus type 1 (HSV-1)—best known for causing cold sores—manipulates and reshapes the three-dimensional structure of human DNA to promote its own replication.
Within just one hour of entering a human cell, HSV-1 begins to hijack the host’s molecular machinery, particularly the enzyme RNA polymerase II (RNAP II), which is essential for copying genetic information. The virus redirects this enzyme to transcribe its own genes instead of the host’s, rapidly taking over the cell’s resources. Additionally, HSV-1 recruits other key host proteins, including topoisomerase I (TOP1) and cohesin, which help relieve DNA strain and fold DNA, respectively. Together, these proteins assist the virus in constructing specialized compartments called viral replication compartments (VRCs), where viral genes are efficiently copied and new viral particles are assembled.
Remarkably, the virus does not simply hijack the cell’s machinery—it physically remodels the architecture of the human genome. Host DNA is pushed to the edges of the nucleus, and chromatin—the tightly packed form of DNA—collapses to just 30% of its normal volume. Human gene activity plummets as viral RNA floods the cell within hours of infection. The virus specifically targets active, gene-rich regions of the host genome, rewiring DNA contacts and loops to enhance genes that benefit its own replication.
The study also revealed a critical vulnerability in the virus’s strategy: blocking the host enzyme TOP1 completely halts the virus’s ability to reshape the genome and form VRCs. In laboratory cell cultures, inhibiting TOP1 prevented HSV-1 from making a single new viral particle, pointing to TOP1 as a promising target for new antiviral therapies.
Dr. Esther González Almela, the study’s first author, described HSV-1 as an “opportunistic interior designer,” reshaping the human genome with precision to exploit host resources. This discovery is the first definitive evidence that HSV-1 intentionally and rapidly reconfigures the 3D structure of the host genome to facilitate its own growth.
HSV-1 currently has no cure and remains in the body for life, often causing recurrent symptoms. The findings open new avenues for developing treatments that could stop the virus in its tracks by targeting the host’s own enzymes, rather than the virus itself.
Disclaimer:
This article is based on recent scientific research published in Nature Communications and summarized by various science news outlets. The information provided is for educational and informational purposes only and is not intended as medical advice. Always consult a healthcare professional for diagnosis and treatment options.
