New Insights into Tick Antiviral Defenses Could Lead to Better Control of Deadly Fever Virus

Researchers from the University of Liverpool have made significant progress in understanding how ticks defend themselves against the severe fever with thrombocytopenia syndrome virus (SFTSV), a tick-borne pathogen responsible for serious illness in humans. Their recent study, published in Nature Communications, provides in-depth insights into the molecular mechanisms ticks use to combat viral infections.

The investigation focused on the tick species Rhipicephalus microplus, revealing that these vectors are not passive carriers but actively respond to viral invasion. Using a systems biology approach and advanced multi-omics techniques, the team mapped the genetic and protein responses in tick cells following infection. They identified two key proteins, UPF1 and DHX9, which serve as natural antiviral factors, restricting the replication of SFTSV within tick cells.

This discovery underscores the sophisticated antiviral strategies ticks employ, challenging previous assumptions of passive transmission. Understanding these mechanisms offers promising avenues for disrupting the cycle of virus transmission from ticks to humans, especially as climate change expands the geographic range of ticks and increases the risk of disease spread.

Professor Alain Kohl, an expert in infectious diseases at the Liverpool School of Tropical Medicine, emphasized the importance of these findings, stating that ticks utilize complex systems to detect and control viruses. He highlighted that by deciphering how ticks manage viruses, researchers can identify potential weak points to block transmission pathways.

Dr. Marine Petit, lead author and virologist at the University of Surrey, explained that tick cells actively mount antiviral defenses, specifically repurposing conserved proteins as molecular guardians. These insights could pave the way for novel strategies to prevent diseases transmitted by ticks, including future vaccine development or targeted interventions. The study also annotated nearly 400 previously unknown proteins and identified numerous RNA molecules, broadening our understanding of tick biology.

As tick-borne diseases pose increasing global health threats, understanding their biology becomes crucial. This research offers hope for innovative methods to reduce the spread of dangerous viruses like SFTSV by targeting the tick's own antiviral mechanisms.

For more detailed information, refer to the original publication: Marine J. Petit et al, Mult-omics analysis of SFTS virus infection in Rhipicephalus microplus cells reveals antiviral tick factors, Nature Communications (2025).