Abstract
DNA of hepatitis B virus is found to be integrated into the genome of infected human liver cells and may be related to the development of primary liver carcinoma. We have previously reported the cloning of cellular DNA with integrated HBV sequences from the PLC/PRF/5 cell line which derives from a human primary liver carcinoma. Two clones, designated as A-10.7 and A-10.5, and a third uncloned fragment are compared by restriction enzyme mapping, hybridization and nucleotide sequencing. The results indicate that amplification of integrated viral DNA and host flanking regions has occurred, followed by transposition and/or major deletions. The implications of these findings for the development of primary liver carcinoma are discussed.
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