Related Experiment Video
Updated: Dec 27, 2025
Biotin-based Pulldown Assay to Validate mRNA Targets of Cellular miRNAs
Published on: June 12, 2018
Bifunctional small molecule-oligonucleotide hybrid as microRNA inhibitor
Umesh Bhattarai1, Wei-Che Hsieh2, Hao Yan3
1Department of Chemistry and Chemical Biology, University of New Mexico, 300 Terrace Street NE, Albuquerque, NM 87131, USA.
Abstract:
miRNAs are key regulators of various biological processes. Dysregulation of miRNA is linked to many diseases. Development of miRNA inhibitor has implication in disease therapy and study of miRNA function. The biogenesis pathway of miRNA involves the processing of pre-miRNA into mature miRNA by Dicer enzyme. We previously reported a proximity enabled approach that employs bifunctional small molecules to regulate miRNA maturation through inhibiting the enzymatic activity of Dicer. By conjugating to an RNA targeting unit, an RNase inhibitor could be delivered to the cleavage site of specific pre-miRNA to deactivate the complexed Dicer enzyme. Herein, we expanded this bifunctional strategy by showing that antisense oligonucleotides (ASOs), including morpholinos and γPNAs, could be readily used as the RNA recognition unit to generate bifunctional small molecule-oligonucleotide hybrids as miRNA inhibitors. A systematic comparison revealed that the potency of these hybrids is mainly determined by the RNA binding of the targeting ASO molecules. Since the lengths of the ASO molecules used in this approach were much shorter than commonly used anti-miRNA ASOs, this may provide benefits to the specificity and cellular delivery of these hybrids. We expect that this approach could be complementary to traditional ASO and small molecule based miRNA inhibition and contribute to the study of miRNA.
Insights
Researchers developed novel miRNA inhibitors using bifunctional small molecule-oligonucleotide hybrids. This approach targets Dicer enzyme activity, offering a new strategy for miRNA research and potential disease therapies.
Area of Science:
- Molecular Biology
- Biochemistry
- Genetics
Background:
- MicroRNAs (miRNAs) are crucial regulators of biological processes, and their dysregulation is implicated in various diseases.
- Inhibiting miRNA function is a therapeutic strategy for diseases and a tool for studying miRNA roles.
- The Dicer enzyme processes pre-miRNA into mature miRNA, making it a target for miRNA regulation.
Purpose of the Study:
- To expand a bifunctional strategy for miRNA inhibition using small molecule-oligonucleotide hybrids.
- To investigate the use of antisense oligonucleotides (ASOs) as RNA recognition units in these hybrids.
- To compare the efficacy of different ASO types (morpholinos, γPNAs) in inhibiting miRNA maturation.
Main Methods:
- Conjugation of small molecules with RNA-targeting units (ASOs) to create bifunctional hybrids.
- Utilizing ASOs, including morpholinos and γPNAs, as the RNA recognition component.
- Systematic comparison of the potency of generated miRNA inhibitors.
Main Results:
- Bifunctional small molecule-oligonucleotide hybrids effectively inhibit miRNA maturation by targeting Dicer.
- The potency of these hybrids is primarily determined by the RNA-binding affinity of the ASO component.
- Shorter ASO lengths in these hybrids may enhance specificity and cellular delivery compared to conventional anti-miRNA ASOs.
Conclusions:
- Antisense oligonucleotides (ASOs) can be effectively employed as RNA recognition units in bifunctional miRNA inhibitors.
- This novel approach offers a complementary strategy to existing miRNA inhibition methods (traditional ASOs and small molecules).
- The developed hybrids hold promise for advancing miRNA research and therapeutic development.
Related Concept Videos
01:22MicroRNAs
01:22MicroRNAs
01:23RNA Interference
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...
02:15Experimental RNAi
02:30siRNA - Small Interfering RNAs
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the...
02:30Small interfering RNAs (siRNA)