Hepatitis B virus covalently closed circular DNA-derived messenger RNA transcript (HBV cccDNA-derived mRNA)

Hepatitis B virus covalently closed circular DNA-derived messenger RNA transcripts are viral mRNAs transcribed from the episomal cccDNA minichromosome formed in the nucleus of infected hepatocytes. This cccDNA acts as the principal transcriptional reservoir for all HBV viral mRNAs—including the pregenomic RNA, preC mRNA, and subgenomic mRNAs required for synthesis of all viral proteins[2][4][5]. The persistence of cccDNA in hepatocytes underlies chronic HBV infection and presents a significant barrier to cure, as current therapies cannot eradicate cccDNA. Epigenetic regulation of the minichromosome determines the transcriptional activity of cccDNA, and targeting cccDNA transcription represents a focus for novel antiviral strategies[1][2][3][4].

Other names

cccDNA-derived mRNAHBV cccDNA transcriptsHBV viral RNAs from cccDNAcccDNA transcription products

Inhibition of HBV DNA polymerase — suppresses production of new rcDNA, indirectly reducing new cccDNA templates. Epigenetic silencing or modification of cccDNA minichromosome — certain drugs inhibit histone acetylation, reducing cccDNA transcription. RNA interference/antisense — experimental approaches to degrade cccDNA-derived viral mRNAs, reducing HBV protein production.