Dissecting Epstein-Barr Virus Dependence Across Diverse Infected Cell Models

Area of Science:

• Virology
• Oncology
• Molecular Biology

Background:

• Epstein-Barr virus (EBV) establishes lifelong infections and is linked to various cancers.
• The extent to which EBV-infected cells rely on the virus for survival and proliferation is not fully understood.
• Understanding EBV dependence is crucial for developing targeted therapies against EBV-associated malignancies.

Purpose of the Study:

• To directly assess the dependence of cancer cells on Epstein-Barr virus (EBV).
• To investigate EBV-loss sensitivity across diverse EBV-positive malignancies.
• To determine if EBV latency type influences viral dependence.

Main Methods:

• Employed two Cas9-based viral eviction strategies to eliminate EBV episomes.
• Targeted EBNA1 for episome dilution and repetitive viral genomic regions for degradation.
• Assessed EBV-loss sensitivity in newly derived EBV-positive Burkitt lymphoma, T/NK, and epithelial cancer cell lines, alongside control cell lines.

Main Results:

• Observed significant EBV-loss sensitivity in all EBV-positive Burkitt lymphoma cell lines and a chronic active EBV disease cell line.
• Demonstrated markedly lower EBV-loss sensitivity in EBV-positive gastric adenocarcinoma cell lines.
• Found that EBV latency type did not correlate with EBV dependence.

Conclusions:

• EBV dependence is widespread across various EBV-associated disease models.
• Newly derived lymphoid malignancies exhibit a particularly strong reliance on EBV.
• Viral gene expression patterns alone do not dictate cellular dependence on EBV.