The flu virus does not just invade human cells. It rewires them from the inside, turning the cell's own machinery into a factory for viral replication. Scientists in the United States have now mapped this takeover in unprecedented detail, revealing how the virus commandeers the cell's nucleus and cytoplasm to build more copies of itself.
A molecular hijacking inside the nucleus
The research team, based at multiple U.S. institutions, tracked the influenza A virus as it entered human lung cells. They found that the virus immediately begins reprogramming the cell's nucleus, the compartment that holds DNA. The virus forces the nucleus to export certain molecules and import others, effectively seizing control of the cell's communication system. This allows the virus to suppress the cell's natural antiviral defenses while boosting its own replication.
How the virus turns the cell into a virus factory
Once the virus has taken over the nucleus, it redirects the cell's protein-making machinery. The cell begins churning out viral proteins instead of its own. The researchers identified specific proteins and pathways that the virus targets, including those involved in RNA processing and transport. By mapping these interactions, the scientists created a detailed picture of the molecular changes that occur during infection. The study was published in a peer-reviewed journal and involved collaboration between virologists, cell biologists, and computational scientists.
Why this matters for people who get the flu
For local communities and people worldwide, the flu remains a serious threat. Each year, seasonal influenza causes millions of illnesses and hundreds of thousands of deaths globally. Understanding exactly how the virus hijacks cells could lead to new antiviral drugs that block these specific rewiring steps. Current flu treatments are limited and the virus can develop resistance. The new map offers a set of potential targets for drugs that would disrupt the virus's ability to take over the cell, rather than just treating symptoms.
The findings also help explain why the flu can be so damaging. By rewiring the cell's nucleus, the virus may cause long-term changes to cell function even after the infection clears. The researchers emphasized that this is a basic science discovery, not a finished treatment. But the detailed molecular map they produced gives other scientists a clear guide for where to look next. The work was funded by the National Institutes of Health and other U.S. research agencies.
