Abstract
The activities of the individual hepatitis B virus (HBV) promoters and the effects of the HBV enhancer on these promoters in several human cell types have been compared by measuring the activity and RNA levels of the linked reporter function chloramphenicol acetyltransferase. The relative promoter activities in the human HepG2 (liver), HeLa, and HS27 (fibroblast) cell lines are in the order precore greater than X greater than preS2 greater than preS1; thus, the promoters of the gene producing the largest quantity of viral proteins have relatively low activity. The juxtaposition of the HBV enhancer in either orientation increased the promoter activities only modestly (2- to 5-fold) in the nonliver cell lines, whereas it dramatically increased (20- to 100-fold) the promoter activities in the liver cell line. Thus, the HBV enhancer is especially active in liver cells. This may be one of the causes of hepatotrophicity of the virus.
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Selected References
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