The octamer motif present in the rex-1 promoter binds oct-1 and oct-3 expressed by EC cells and ES cells

Edward Rosfjord, Angie Rizzino

Research output: Contribution to journalArticle

34 Scopus citations


Rex-1 is a zinc finger-containing gene that is expressed in embryonal carcinoma (EC) cells and embryonic stem (ES) cells. Upon differentiation with retinoic acid (RA), transcription of the Rex-1 gene decreases rapidly. Analysis of the 5'-flanking region of the Rex-1 gene identified a consensus motif for the octamer family of transcription factors that stimulates expression from the Rex-1 promoter. In this report, we utilized gel mobility shift analysis to examine the binding of transcription factors to the Rex-1 octamer motif. F9 EC cells, D3 ES cells, and human NT2/D1 EC cells each form at least two prominent DNA/protein complexes with the octamer motif. Supershift analysis identifies Oct-1 and Oct-3 in these complexes. When F9 EC cells are induced to differentiate by treatment with RA for 48 h, there is a complete loss of the DNA/protein complex containing Oct-3. In contrast, the other DNA/protein complexes, including the DNA/protein complex containing Oct-1, can still be detected. These results provide support for a role of Oct-3 in the transcription of the Rex-1 gene.

Original languageEnglish (US)
Pages (from-to)1795-1802
Number of pages8
JournalBiochemical and Biophysical Research Communications
Issue number3
StatePublished - Sep 30 1994


ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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