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Updated: Oct 16, 2025

mirMachine: A One-Stop Shop for Plant miRNA Annotation
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Conditional Antisense Oligonucleotides Triggered by miRNA.

Jiahui Zhang1, Radhika Sharma2, Kitae Ryu1

  • 1Wallace H. Coulter Department of Biomedical Engineering, Emory University and Georgia Institute of Technology, Atlanta, Georgia 30332, United States.

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Conditional antisense oligonucleotides (ASOs) are engineered to activate only in specific cells, using unique miRNA triggers. This innovation enhances therapeutic precision by targeting gene silencing to desired cells, minimizing off-target effects.

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Area of Science:

  • Molecular Biology
  • Oligonucleotide Therapeutics
  • Gene Regulation

Background:

  • Antisense oligonucleotides (ASOs) offer therapeutic potential for gene silencing but face challenges due to non-specific uptake by various cell types.
  • Unwanted gene silencing in normal cells limits the therapeutic application of conventional ASOs.

Purpose of the Study:

  • To develop conditional antisense oligonucleotides (ASOs) that activate gene silencing specifically in target cells based on unique cellular transcripts.
  • To demonstrate the proof-of-concept for miRNA-triggered conditional ASOs for precise therapeutic intervention.

Main Methods:

  • Modification of an HIF1α ASO (EZN2968) into miRNA-specific conditional ASOs utilizing a toehold exchange mechanism.
  • Characterization of nucleic acid libraries to optimize conditional ASO conformation, thermostability, and chemical composition for miR-122 responsiveness.
  • Testing of conditional ASO efficacy and specificity in cell models with exogenous and endogenous miR-122 expression.

Main Results:

  • Optimized conditional ASOs successfully inhibited HIF1α expression in cells containing miR-122, confirming miRNA-specific activation.
  • Toehold exchange mechanism was validated as the mode of action, with knockdown magnitude dependent on toehold length and miR-122 levels.
  • Development of a second conditional ASO triggered by miR-21, demonstrating the versatility of the platform.

Conclusions:

  • Conditional ASOs can be custom-designed with specific miRNAs to achieve targeted gene silencing in desired cells.
  • This approach effectively reduces unwanted effects in non-targeted cells, enhancing the safety and specificity of oligonucleotide therapeutics.
  • The toehold exchange-based conditional ASO platform offers a promising strategy for precise control of gene silencing in various therapeutic applications.