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Nucleic Acids Research, 1983, Vol. 11, No. 16 5391-5402
© 1983

MOLECULAR BIOLOGY

Rearrangement of the surface antigen gene of hepatitis B virus integrated in the human bepatoma cell lines

K. Koike, M. Kobayashi, H. Mizusawa, E. Yoshida, K. Yaginuma and M. Taira

Cancer Institute, Japanese Foundation for Cancer Research Kami-Ikebukuro, Toshima-ku, Tokyo 170, Japan

Received June 9, 1983. Accepted March 2, 1983.

The rearrangement of integrated HBV DNA sequences in three different hepatoma cell lines, huH-1, huH-2, KG-55-T from Japanese patients, were studied by blot hybridization using whole HBV genome or a HBsAg or HBcAg DNA as a probe. The characteristic existence of multiple Integration sites of HBV DNA sequences 1n each HindIII-restricted hepatoma cell DNA was revealed by the HBV genome probe. Detection of the isolated HBsAg gene 1n the H1ndIII fragment indicates that the integration of HBV DNA was not always related to the maintenance of the whole viral genome, and that movement of the HBsAg gene to another location occurred by rearrangement. On the other hand, the presence of the HBV DNA sequence without the intact HBcAg gene was shown in some of the HindIII fragments, when the HBcAg gene probe was used, but a HindIII fragment, containing only the HBcAg gene, was not detected so far. The absence of the intact HBcAg gene suggests that the viral genome may lose a part of the HBcAg gene in the process of integration. This is consistent with recent findings of Ogston et al. (1982) that in Woodchuck hepatocellular carcinoma viral sequences are extensively rearranged.


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