Br Med Bull. 1990 Apr;46(2):399-407.

Delta hepatitis. The disease and the virus.

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Department of Medicine, St. Mary's Hospital Medical School, London.

Abstract

Delta hepatitis virus is a new human pathogen always found associated with hepatitis B virus (HBV) causing both fulminant hepatitis and the accelerated progression of pre-existing HBV hepatitis. The virus is coated in HBsAg and contains circular single stranded RNA genome with very high intramolecular base-pairing, similar to the genomes of plant viroids, and the HDV antigen, a specific marker of HDV infection also found in the nuclei of infected hepatocytes. The genome is about 1700 nucleotides long and of minus polarity with a major constant antigenomic Open Reading Frame (ORF) which codes for the antigen. Replication of viral RNA appears to proceed by a rolling circle mechanism and specific self-cleavage and self-ligation of both genomic and antigenomic HDV RNA strands has been demonstrated in vitro. HDV appears to require HBsAg for its propagation and hepatotropism but not to depend on HBV for replication.

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