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Researchers identified peptide ligands targeting i-motif (iM) DNA structures in the c-Myc gene promoter. These peptides modulate c-Myc expression, offering potential for new cancer therapies.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Drug Discovery

Background:

  • c-Myc is a crucial oncogene, frequently dysregulated in cancers, making it a challenging drug target.
  • i-Motif (iM) DNA structures in gene promoter regions are emerging targets for gene expression modulation.
  • Specific iM structures upstream of the c-Myc P1 promoter are of significant interest.

Purpose of the Study:

  • To identify selective peptide ligands for the c-Myc gene promoter i-motif (iM) structure.
  • To evaluate the potential of these ligands in modulating c-Myc gene expression.
  • To explore their utility as chemical tools for cancer research and therapeutic development.

Main Methods:

  • Phage display was employed to identify peptide ligands binding to the c-Myc iM.
  • Selectivity of identified peptides for iM structures was confirmed using displacement assays and DNA melting experiments.
  • Functional validation involved assessing dose-dependent changes in c-Myc gene expression in HEK293 cells using a reporter construct.

Main Results:

  • Novel peptide ligands targeting the c-Myc promoter iM were successfully identified.
  • Lead peptides demonstrated selective binding to iM structures over other DNA conformations.
  • Two lead peptides significantly altered c-Myc gene expression in a dose-dependent manner in cellular assays.

Conclusions:

  • The identified peptides serve as valuable chemical tools for in vitro manipulation of the c-Myc iM.
  • These peptide leads hold potential for development into cell-permeable peptidomimetics for in vivo applications.
  • Targeting c-Myc iM structures represents a promising strategy for developing novel anti-cancer therapeutics.