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Autotransfecting short interfering RNA through facile covalent polymer escorts
Saadyah E Averick1, Eduardo Paredes, Sourav K Dey
1Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, USA.
Journal of the American Chemical Society
|August 14, 2013
Summary
New polymer-escort short interfering ribonucleic acids (siRNAs) overcome barriers to gene knockdown. These enhanced siRNAs protect against nucleases and improve cell entry, demonstrating effective gene silencing for research and potential therapies.
Area of Science:
- Molecular Biology
- Biochemistry
- Drug Delivery
Background:
- Short interfering ribonucleic acids (siRNAs) are key tools for RNA interference (RNAi) in gene function studies and therapeutics.
- siRNA efficacy is limited by degradation by cellular nucleases and poor cell membrane permeability.
Purpose of the Study:
- To develop novel siRNA constructs that enhance stability and cellular uptake.
- To create polymer-escort siRNAs capable of self-transfection and effective gene knockdown.
Main Methods:
- Post-synthetic click conjugation of polymers to the passenger strand of siRNA duplexes.
- Annealing the modified passenger strand with the complementary guide strand to form polymer-escort siRNA.
- Assessing siRNA viability in RNA interference and gene knockdown efficacy in reporter and endogenous genes.
Main Results:
- Successfully synthesized covalent polymer-escort siRNA constructs.
- Polymer escorts provided protection against nuclease degradation.
- Enhanced cellular internalization and effective knockdown of target genes were observed.
Conclusions:
- Polymer-escort siRNAs represent a promising strategy to overcome delivery challenges in RNAi.
- These constructs are effective for gene knockdown, offering potential for therapeutic applications.
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This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
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