Recurrent HBV Integration Targets as Potential Drivers in Hepatocellular Carcinoma

Area of Science:

• Genomics
• Oncology
• Virology

Background:

• Chronic hepatitis B virus (HBV) infection is a primary cause of hepatocellular carcinoma (HCC).
• HBV DNA integration into the host genome is a frequent event in HBV-associated HCC (HBV-HCC), implicated in oncogenesis.
• Identifying specific host genes targeted by HBV integration is crucial for understanding HCC development.

Purpose of the Study:

• To identify recurrently targeted genes (RTGs) by HBV integration in HCC.
• To characterize the oncogenic potential of these RTGs.
• To establish a consensus for HBV-HCC driver identification to inform drug development and disease management.

Main Methods:

• Analysis of 18,596 HBV integration sites from multiple studies.
• Definition and identification of RTGs based on frequency and recurrence across HCC patients and studies.
• Detailed analysis of breakpoint positions for top RTGs, including TERT, MLL4/KMT2B, and PLEKHG4B.

Main Results:

• Identification of 396 RTGs, with 28 genes affected in at least 10 HCC patients.
• Of the 28 most frequent RTGs, 82% are known to be associated with carcinogenesis.
• Observed mutual exclusivity between TERT promoter mutations and HBV integration at the TERT locus.

Conclusions:

• Recurrently targeted genes (RTGs) represent key targets of HBV integration in HCC.
• The identified RTGs highlight potential oncogenic drivers in HBV-HCC.
• This comprehensive RTG analysis provides a framework for discovering HCC drivers for therapeutic strategies.