Abstract
Attention was directed to hepatitis B virus (HBV) integration in tissues obtained from an hepatocellular carcinoma (HCC) of an 11-year-old boy and from the liver of his 6-year-old brother, who had chronic active hepatitis. Multiple HBV DNA integration sites were demonstrated in both tissues. Cell population(s) in the HCC and liver from the patient with chronic active hepatitis were assumed to be heterogeneous with regard to HBV integration. The integrated forms in the two tissues showed similar genetic organization without gross rearrangement. The location of one of the virus-chromosomal junctions was restricted to the 5'-end region of the minus-strand DNA of HBV. The experimental results support our previous model for the mechanism of HBV integration, in which minus-strand replicative intermediates integrate into chromosomal DNA. The integrated HBV DNAs were conserved in the same region of the viral genome, spanning from the C gene through the S gene to the X gene, which contains intrinsic promoter-enhancer sequences.
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