Generation of a KSHV K13 deletion mutant for vFLIP function study

Area of Science:

• Virology
• Molecular Biology
• Oncology

Background:

• Kaposi's sarcoma-associated herpesvirus (KSHV) encodes viral FLIP (vFLIP), a protein crucial for latent infection and cell survival via NF-κB activation.
• Understanding vFLIP's role requires genetic manipulation within the viral genome.

Purpose of the Study:

• To develop a system for studying KSHV vFLIP mutations within the viral genome.
• To generate a vFLIP-knockout KSHV mutant for further research.

Main Methods:

• Utilized bacterial artificial chromosome (BAC) technology and E. coli Red recombination to delete the KSHV vFLIP (K13/ORF71) coding sequence.
• Verified the deletion using PCR, restriction digestion, and sequencing.
• Created the vFLIP-knockout mutant by transfecting K13 deletion bacmids into iSLK cells.

Main Results:

• Successfully generated a KSHV vFLIP-knockout mutant virus.
• Confirmed the absence of vFLIP expression in the mutant.
• Demonstrated that human umbilical vein endothelial cells (HUVECs) can be infected by the vFLIP mutant virus.

Conclusions:

• The developed vFLIP-knockout KSHV system enables the study of vFLIP's function in KSHV pathogenesis.
• This mutant virus provides a valuable tool for investigating vFLIP's role in regulating other KSHV genes and viral replication.