Detection, infection dynamics and small RNA response against Culex Y virus in mosquito-derived cells

Area of Science:

• Virology
• Molecular Biology
• Entomology

Background:

• Insect cell lines can be persistently infected with unrecognized insect-specific viruses (ISV).
• ISV infections may interfere with arbovirus infections, impacting arbovirus research.
• Culex Y virus (CYV), an entomobirnavirus, is an example of a relevant ISV.

Purpose of the Study:

• To detect and characterize persistent Culex Y virus (CYV) infections in commonly used mosquito cell lines.
• To highlight the importance of recognizing ISV presence in cell lines for arbovirus research.

Main Methods:

• Small RNA sequencing to identify viral small RNAs.
• Electron microscopy for visualizing viral particles.
• Polymerase Chain Reaction (PCR) for viral genome detection.

Main Results:

• CYV-specific small RNAs were detected in Aag2, U4.4, and C7-10 mosquito cell lines.
• Viral RNA genome levels varied across cell passages, affecting detection consistency.
• Electron microscopy detection of CYV was irregular due to variable viral RNA genome presence.

Conclusions:

• Persistent CYV infection is present in commonly used mosquito cell lines.
• Understanding ISV presence is vital for interpreting arbovirus co-infection studies.
• Further research into ISV-host interactions is needed for public health arbovirus concerns.