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Modeling Gene Expression Instability by Programmed and Switchable Polymerization/Nicking DNA Nanomachineries.

Zhixin Zhou1, Daoqing Fan1, Itamar Willner1

  • 1Institute of Chemistry, The Minerva Center for Biohybrid Complex Systems, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.

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Summary

This study introduces DNA nanostructures to model gene expression instability. These structures can perturb DNA synthesis and be removed to restore normal gene expression, offering a way to eliminate instability.

Keywords:
DNAzymeG-quadruplexaptamernanotechnologyswitchtriplex

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Area of Science:

  • Molecular Biology
  • Nanotechnology
  • Biochemistry

Background:

  • Gene expression instability can arise from noncanonical DNA structures.
  • Understanding these instabilities is crucial for controlling gene synthesis and function.

Purpose of the Study:

  • To introduce novel DNA nanostructures for modeling gene expression instability.
  • To investigate the impact of noncanonical DNA structures on DNA synthesis machinery.
  • To demonstrate a method for restoring normal gene expression.

Main Methods:

  • Development of promoter-template scaffolds with integrated noncanonical DNA nanostructures (G-quadruplexes, triplexes, aptamer complexes).
  • Utilizing polymerase and Nt.BbvCI enzymes for DNA polymerization and nicking.
  • Analysis of displaced strand synthesis and structural changes.

Main Results:

  • Noncanonical DNA nanostructures perturbed the DNA polymerization/nicking machinery.
  • Incorporated structures led to the synthesis of altered displaced strands ('genes').
  • Dissociation of blockage units restored the synthesis of original, intact displaced strands.

Conclusions:

  • Noncanonical DNA nanostructures can be used to model and control gene expression instability.
  • The developed system offers conceptual means to eliminate destructive gene expression pathways.
  • This approach provides a foundation for engineering gene expression stability.