Development of Neutralization Assay Using an eGFP Chikungunya Virus

Area of Science:

• Virology
• Molecular Biology
• Immunology

Background:

• Chikungunya virus (CHIKV), an Alphavirus, is a significant emerging and re-emerging human pathogen.
• Current therapeutic options and vaccines against CHIKV infection are lacking.
• The Asian lineage of CHIKV poses a global health concern.

Purpose of the Study:

• To construct an infectious clone of CHIKV and an enhanced green fluorescent protein (eGFP) reporter CHIKV (eGFP-CHIKV).
• To establish a reliable reporter virus system for visualizing CHIKV replication.
• To develop novel assays for identifying CHIKV inhibitors and neutralizing antibodies.

Main Methods:

• Construction of an infectious clone of an Asian lineage CHIKV strain.
• Development of an eGFP-CHIKV reporter virus for real-time replication monitoring.
• Validation of the eGFP-CHIKV system using a known antiviral (ribavirin).
• Establishment of a neutralization assay using the eGFP-CHIKV reporter virus.

Main Results:

• Successfully generated an infectious eGFP-CHIKV reporter virus.
• Demonstrated that eGFP expression directly correlates with viral replication.
• Confirmed the utility of eGFP-CHIKV for identifying CHIKV inhibitors.
• Developed a novel and reliable neutralization assay for rapid screening of neutralizing antibodies against CHIKV.

Conclusions:

• The eGFP-CHIKV reporter virus is a valuable tool for studying CHIKV replication and infection dynamics.
• This reporter system facilitates the discovery of novel antiviral drugs targeting CHIKV.
• The developed neutralization assay enables high-throughput screening for CHIKV-neutralizing antibodies, aiding vaccine development.