Modulation of the human Harvey-ras oncogene expression by DNA methylation

M. G. Borrello, M. A. Pierotti, R. Donghi, I. Bongarzone, M. R. Cattadori, C. Traversari, P. Mondellini, G. Della Porta

Research output: Contribution to journalArticlepeer-review


A clone of the human transforming Ha-ras oncogene (pT24-C3) was methylated 'in vitro' at its HpaII and HhaI sites and co-transfected with a selectable marker into NIH/3T3 cells. In the resulting colonies the normal or transformed morphology correlated respectively with a methylated or unmethylated status of the Ha-ras 1 promoter. A transfected, morphologically normal NIH/3T3 colony treated with 5'-azacytidine acquired a transformed phenotype growing in agar and in nude mice and showed demethylation of the promoter region of Ha-ras 1 gene. The cells of the reactivated colony produced human Ha-ras 1 mRNA and p21, and their DNA displayed transforming activity for NIH/3T3 recipient cells that was due to the original human Ha-ras 1 oncogene. We conclude that the methylation status of the promoter region of the human Ha-ras 1 modulates the expression and consequently the transforming activity of the oncogene.

Original languageEnglish
Pages (from-to)197-203
Number of pages7
JournalOncogene Research
Issue number2
Publication statusPublished - 1988

ASJC Scopus subject areas

  • Cancer Research


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