Duck hepatitis A virus type 1 mediates cell cycle arrest in the S phase

Area of Science:

• Virology
• Cell Biology
• Molecular Biology

Background:

• Duck hepatitis A virus type 1 (DHAV-1) poses a significant threat to the duck industry.
• Limited research exists on DHAV-1's impact on host cell cycle regulation.

Purpose of the Study:

• To investigate the effects of DHAV-1 infection on the cell cycle of duck embryo fibroblasts (DEFs).
• To determine how different cell cycle phases influence DHAV-1 replication.

Main Methods:

• Utilized flow cytometry to analyze cell cycle distribution in DHAV-1 infected DEFs.
• Employed real-time reverse transcriptase quantitative PCR (real-time RT-qPCR) to quantify viral RNA levels across cell cycle phases.

Main Results:

• DHAV-1 infection led to a significant increase in DEFs entering the S phase (25.85% at 24h, 54.21% at 48h).
• Viral RNA levels were elevated in DEFs synchronized in the S or G0/G1 phases compared to controls.
• DHAV-1 non-structural protein 3D was identified as a factor inducing S phase arrest.

Conclusions:

• DHAV-1 infection causes S phase cell cycle arrest in DEFs.
• S and G0/G1 phase synchronization promotes DHAV-1 replication.
• DHAV-1 protein 3D contributes to S phase arrest, impacting viral replication.