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Human glioblastoma cell lines are known to develop polysomy of cytogenetically intact chromosomes #7 and overexpression of the erbB oncogene (7p12-p14) at a level even higher than is to be expected from the number of #7 chromosomes. The met oncogene, however, which is also located on chromosome #7 (7q31-q32), was shown not to be overexpressed in a panel of 7-polysomic glioblastoma cell lines overexpressing erbB. Molecular analysis of the cell line HeRo gave proof that there is no detectable amplification or rearrangement of the erbB gene which could be responsible for its overexpression. These findings favor the assumption of differential regulation of the met and erbB oncogenes, e.g. by means of insufficient activity of a trans-acting erbB suppressor gene possibly located on a chromosome with a low copy number.
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