Classifying hepatitis B therapies with insights from covalently closed circular DNA dynamics

Area of Science:

• Hepatology
• Virology
• Systems Biology

Background:

• Functional cure for chronic hepatitis B (CHB) is limited with current therapies.
• Reducing covalently closed circular DNA (cccDNA) is essential for CHB functional cure.
• Understanding cccDNA dynamics is crucial for developing effective anti-HBV strategies.

Purpose of the Study:

• To elucidate the HBV replication cycle using a systems thinking approach.
• To rationalize the classification of anti-HBV treatment strategies based on cccDNA dynamics.
• To propose a combined therapeutic approach for significant cccDNA reduction.

Main Methods:

• Systems thinking analysis of the HBV replication cycle.
• Classification of existing anti-HBV strategies based on their effect on cccDNA.
• Review of factors influencing cccDNA dynamics during treatment.

Main Results:

• HBV replication cycle fundamentals elucidated through systems thinking.
• Anti-HBV strategies categorized into two distinct groups based on cccDNA impact.
• A framework for understanding cccDNA dynamics during CHB treatment.

Conclusions:

• Combination therapy is advocated to significantly reduce cccDNA levels.
• A systems approach provides a rational basis for classifying and combining anti-HBV treatments.
• Enhanced functional cure rates for CHB are achievable with optimized therapeutic strategies.