Structural Rearrangement of Integrated Hepatitis B Virus DNA As Well As Cellular Flanking DNA is Present in Chronically Infected Hepatic Tissues

Overview

Journal J Virol

Publisher American Society for Microbiology

Date 1990 Feb 1

PMID 2296084

Citations 32

Authors

S Takada

Y Gotoh

S Hayashi

M Yoshida

K Koike

Affiliations

Soon will be listed here.

Abstract

Cellular DNAs from human livers chronically infected with hepatitis B virus (HBV) were analyzed by Southern blot hybridization for the presence of integrated HBV DNA. In 15 of 16 chronically infected hepatic tissues, random HBV DNA integration was evident. By molecular cloning and structural analyses of 19 integrants from three chronically infected hepatic tissues, deletion of cellular flanking DNA in all cases and rearrangement of HBV DNA with inverted duplication or translocation of cellular flanking DNA at the virus-cell junction in some cases were noted. Thus, the rearrangement of HBV DNA or cellular flanking DNA is not a specific incident of hepatocellular carcinoma formation. Detailed analyses of various integrants bearing rearranged viral DNA failed to indicate any gross structural alteration in cellular DNA, except for a small deletion at the integration site, indicating that viral DNA rearrangement with inverted duplication possibly occurs before integration of HBV DNA. Based on nucleotide sequencing analyses of virus-virus junctions, a one- to three-nucleotide identity was found. A mechanism for this inverted duplication of HBV DNA is proposed in which illegitimate recombination between two complementary viral strands may take place by means of a nucleotide identity at the junction site in a weakly homologous region (patchy homology) on one side of adjoining viral sequences. For virus-cell junctions, the mechanism may be basically similar to that for virus-virus junctions.

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