ANCHOR-tagged equine herpesvirus 1: A new tool for monitoring viral infection and discovering new antiviral compounds.

This research article presents the development of a new tool, dubbed the ANCHOR system, to monitor the infection lifecycle of Equine Herpesvirus 1 (EHV-1), which causes significant disease in horses. This system has also helped identify potential new antiviral treatments for the disease.

Introduction to the ANCHOR System

• Equine herpesvirus 1 (EHV-1) is known to cause various conditions in horses including respiratory disorders, abortion, and myeloencephalopathy, thereby affecting the equine health and the related economic aspects.
• In an effort to better understand the replication and effects of the EHV-1 genome, the researchers integrated a specific system known as ANCHOR into the virus’s genome.
• This was achieved through a process known as targeted homologous recombination.
• The ANCHOR system drives the EHV-1 DNA to transform into auto-fluorescent spots that can be easily observed through fluorescence microscopy.

Implications of the ANCHOR System

• The integration of the ANCHOR system enabled the production of an auto-fluorescent EHV-1 (EHV-1 ANCHORGFP) which replicated at similar rates and with a similar tropism to the original strain.
• High-resolution imaging was used to track the replication of EHV-1 throughout infected cells, from the initial appearance of the viral genome to the formation of large replications centers.
• This detailed imaging helped to understand the infection process and replication stages of the virus, both in single cells and in syncytia (a collection of cells that act as one).

Discovery of New Potential Antivirals

• By utilizing this modified EHV-1 in conjunction with high-content microscopy, the researchers were able to screen and identify potential antiviral treatments for EHV-1.
• Two compounds, auranofin and azacytidine-5, were found to potentially carry antiviral properties and could be new means for treating EHV-1 infection.
• These findings represent the initial steps toward the development of an effective treatment for this viral infection in horses.