Encephalomyocarditis virus can bind to and transfect non-permissive cells

Area of Science:

• Virology
• Cell Biology
• Molecular Biology

Background:

• Encephalomyocarditis virus (EMC virus) is an RNA virus with a broad host range.
• Cellular permissivity dictates viral replication efficiency.
• Understanding host-pathogen interactions is crucial for controlling viral infections.

Purpose of the Study:

• To investigate the cellular basis of differential permissivity to EMC virus infection between mouse and rat cells.
• To identify the specific stage of the viral replication cycle that is blocked in non-permissive rat cells.

Main Methods:

• Infection of permissive mouse embryo fibroblasts and mouse adrenal tumor cells with EMC virus.
• Infection of non-permissive rat glial and rat hepatoma cells with EMC virus.
• Assessment of viral attachment to both permissive and non-permissive cells.
• Transfection of rat cells with EMC virus RNA to assess replication post-attachment.

Main Results:

• Mouse cells supported EMC virus replication, while rat cells were non-permissive.
• EMC virus attached efficiently to both mouse and rat cells, ruling out attachment as the limiting factor.
• Transfection of rat cells with EMC virus RNA resulted in viral replication, indicating the block occurs post-attachment.

Conclusions:

• The non-permissivity of rat cells to EMC virus is not due to a failure of virus attachment.
• The replication block in rat cells occurs after virus entry but before or during the uncoating stage.
• These findings highlight the uncoating step as a potential determinant of EMC virus host range and replication.