Abstract
Hepadnaviruses multiply their DNA genome by reverse transcription of an RNA intermediate, termed pregenomic RNA. Therefore, hepadnaviral transcription has a dual function: the production of the RNA template for genome replication and the synthesis of messenger RNAs (mRNAs). The very small viral genome is fully covered by extensively overlapping coding sequences, requiring an expression strategy that uses differential transcription initiation and unspliced transcripts to produce at least seven viral gene products from four open reading frames. This complex organization implies that the hepatitis B virus (HBV) genome contains several transcriptional control regions, that these regions are located at short distances from each other (maximally 1.6 kb apart in the circular 3.2-kb genome), and that all are themselves actively transcribed during viral replication and eventually translated into protein. This scenario, which is without precedent in other known replication units, has most likely imposed unusual restrictions on the evolution of the mechanisms regulating hepadnaviral gene expression and hence on elements involved in transcriptional control.
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Schaller, H., Fischer, M. (1991). Transcriptional Control of Hepadnavirus Gene Expression. In: Mason, W.S., Seeger, C. (eds) Hepadnaviruses. Current Topics in Microbiology and Immunology, vol 168. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-76015-0_2
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DOI: https://doi.org/10.1007/978-3-642-76015-0_2
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