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Related Experiment Videos

Functional cooperativity between two TPA responsive elements in undifferentiated F9 embryonic stem cells.

A Okuda1, M Imagawa, M Sakai

  • 1Department of Biochemistry, University of Tokyo Faculty of Medicine, Japan.

The EMBO Journal
|April 1, 1990
PubMed
Summary

Researchers discovered a gene enhancer, GPEI, in rat glutathione transferase P. This enhancer shows strong activity in F9 cells due to two synergistic TPA-responsive elements (TREs).

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Area of Science:

  • Molecular Biology
  • Gene Regulation

Background:

  • The rat glutathione transferase P (GSTP) gene plays a role in cellular defense.
  • Enhancers are crucial DNA sequences that regulate gene transcription.

Purpose of the Study:

  • To identify and characterize novel regulatory elements in the 5'-flanking region of the rat GSTP gene.
  • To investigate the mechanism of transcriptional enhancement by GPEI in F9 embryonic stem cells.

Main Methods:

  • Identification of the GPEI enhancer in the rat GSTP gene's 5'-flanking region.
  • Mutational analysis to determine the functional components of GPEI.
  • Reporter gene assays to assess transcriptional activity in F9 cells.

Main Results:

  • GPEI comprises two imperfect TPA-responsive elements (TREs).

Related Experiment Videos

  • GPEI exhibits significant transcriptional enhancing activity in F9 cells, even with low AP-1 activity.
  • Synergistic interaction between the two TREs is essential for GPEI's high activity.
  • Synthetic DNA constructs with optimized TRE arrangements show strong, orientation- and distance-dependent enhancement in F9 cells.

    • Conclusions:

    • The GPEI enhancer utilizes a synergistic mechanism involving two imperfect TREs to achieve high activity in F9 cells.
    • This finding provides insights into the regulation of GSTP gene expression in embryonic stem cells.
    • The study highlights the importance of the arrangement of TREs for enhancer function.