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Related Experiment Videos

Altered gene expression correlates with DNA structure.

Y Kohwi1, T Kohwi-Shigematsu

  • 1La Jolla Cancer Research Foundation, California 92037.

Genes & Development
|December 1, 1991
PubMed
Summary
This summary is machine-generated.

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Poly(dG)-poly(dC) sequences regulate gene expression by forming triplex DNA structures. Shorter sequences enhance gene expression, while longer ones, forming triplexes, inhibit it by blocking factor binding.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Gene regulation is influenced by DNA structures beyond the canonical double helix.
  • Poly(dG)-poly(dC) sequences are known to form triplex DNA under specific conditions.
  • The role of triplex DNA in modulating gene expression requires further elucidation.

Purpose of the Study:

  • To investigate the role of triplex DNA structures in gene regulation.
  • To model this using a poly(dG)-poly(dC) sequence.
  • To determine the effect of poly(dG)-poly(dC) sequence length on gene expression.

Main Methods:

  • Utilized a reporter gene assay in mouse LTK- cells.
  • Constructed supercoiled plasmids with varying lengths of poly(dG)-poly(dC) sequences.

Related Experiment Videos

  • Performed in vivo competition assays to assess trans-acting factor binding.
  • Analyzed DNA structure under varying superhelical densities in vitro.

    • Main Results:

    • Poly(dG)-poly(dC) sequences placed 5' to a promoter augmented reporter gene expression.
    • Expression augmentation showed length dependency: 27-30 bp tracts were effective, while 35 bp and longer were not.
    • Shorter dG tracts (30 bp) competed for trans-acting factors in vivo, whereas longer tracts (35 bp+) did not.
    • In vitro, dG tracts ≥32 bp formed triplexes at superhelical density -0.05, while shorter tracts remained double-stranded.

    Conclusions:

    • Localized superhelical strain in vivo can induce triplex formation in poly(dG)-poly(dC) sequences.
    • Triplex formation, particularly with longer dG tracts (≥35 bp), prevents trans-acting factor binding.
    • Poly(dG)-poly(dC) sequences can act as negative gene regulators by forming intramolecular triple helix structures in vivo.