Hepatitis B virus X gene mRNA (HBx mRNA)

Hepatitis B virus X gene mRNA (HBx mRNA) is the transcript responsible for the synthesis of the HBx protein, a non-structural regulatory protein essential for the Hepatitis B virus (HBV) life cycle (Source: UniProt, P03402). The HBx protein plays a pivotal role in initiating and maintaining the transcription of viral genes from the covalently closed circular DNA (cccDNA) by facilitating the degradation of the Smc5/6 complex, which otherwise silences the viral genome (Source: Decorsière et al., Nature 2016). Additionally, HBx modulates various host cellular processes, including signal transduction, cell cycle progression, and apoptosis, contributing significantly to the pathogenesis of chronic hepatitis B and the development of hepatocellular carcinoma (Source: NIH, PubMed PMC6691346). Because the HBx sequence is highly conserved and present in all HBV transcripts due to the virus's overlapping reading frames, it serves as a primary target for RNA-targeted therapies (Source: Gane et al., Lancet Infectious Diseases 2020). Therapeutic candidates such as JNJ-3989 and VIR-2218 utilize RNA interference (RNAi) to degrade HBx mRNA, thereby reducing the production of all viral proteins, including HBsAg, which is a critical step toward achieving a functional cure (Source: Vir Biotechnology; Janssen). This strategy aims to suppress viral replication and alleviate the immune exhaustion caused by chronic exposure to viral antigens (Source: GSK, Bepirovirsen clinical data).

Other names

HBV X mRNAHBx transcriptHepatitis B virus X protein mRNA

RNA interference (RNAi) and antisense oligonucleotide (ASO) mediated degradation of viral mRNA transcripts to inhibit protein translation and viral replication.