Transcriptional activation encoded by the v-fos gene

C. Setoyama, R. Frunzio, G. Liau, Maria Mudryj, B. de Crombrugghe

Research output: Contribution to journalArticlepeer-review

105 Scopus citations


We present evidence that the fos oncogene encodes a transcriptional trans-activation function, trans-activation was assayed by cotransfection into NIH 3T3 mouse fibroblasts of v-fos DNA containing plasmids together with a plasmid containing a test promoter. Three v-fos DNAs were used: (i) pFBR-1, a plasmid containing the FBR proviral sequences; (ii) pFBJ-2, a plasmid harboring the FBJ proviral sequences; (iii) pMF-J, a plasmid containing the FBJ fos sequences linked to a mouse metallothionein promoter. Each of the three v-fos DNA plasmids stimulated the expression of a cotransfected chimeric gene consisting of a promoter segment of the mouse α1(III) collagen gene linked to the gene for chloramphenicol transacetylase. In similar experiments the v-fos gene also stimulated the long terminal repeat promoter of Rous sarcoma virus (RSV) but neither the early promoter of simian virus 40 nor the β-actin promoter. Evidence that the trans-activation function is specified by the v-fos coding sequences comes from the fact that a frameshift mutation in the v-fos coding sequence inhibits the trans-activation. Two mutations that map around nucleotide -100 in the RSV promoter do not respond to cotransfection with v-fos, whereas other mutations respond like the wild-type RSV promoter. These experiments suggest that the v-fos gene either encodes or induces an activator of transcription that recognizes specific sequences in promoters.

Original languageEnglish (US)
Pages (from-to)3213-3217
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number10
StatePublished - 1986
Externally publishedYes

ASJC Scopus subject areas

  • Genetics
  • General


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