Abstract
Hepatocellularcarcinoma (HCC) that occur in woodchucks chronically infected with woodchuck hepatitis virus (WHV) were screened for activation of cellular oncogenes. Enhanced expression and allelic alterations of the c-myc oncogene were found in three HCC out of nine. Variations in the size of the c-myc transcripts, ranging from 2.0 kilobases (kb) to 5.6 kb, as well as in the level of c-myc gene expression, 5–50-fold higher than in adjacent liver tissues, were observed among the three HCC. Rearrangements of the c-myc locus were either upstream of the gene or within the first intron. Cloning and sequencing of the break-point region from one of the three tumours showed that the c-myc gene was truncated and joined to a unique cellular sequence of unknown function. WHV DNA was not integrated near the c-myc coding exons, excluding a direct role of the virus in c-myc activation. The novel type of rearrangement and activation of the c-myc gene, reported here in liver tumours of hepatitis virus infected animals, appears strikingly similar to those resulting from chromosomal translocations in human Burkitt's lymphomas, acute B- and T-cell leukaemias and mouse plasmacytomas.
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Möröy, T., Marchio, A., Etiemble, J. et al. Rearrangement and enhanced expression of c-myc in hepatocellular carcinoma of hepatitis virus infected woodchucks. Nature 324, 276–279 (1986). https://doi.org/10.1038/324276a0
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DOI: https://doi.org/10.1038/324276a0
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