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Updated: Jan 5, 2026
Genome-wide Screen for miRNA Targets Using the MISSION Target ID Library
Published on: April 6, 2012
Cotargeting among microRNAs in the brain
Jennifer M Cherone1, Vjola Jorgji2, Christopher B Burge1
1Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Abstract:
MicroRNAs (miRNAs) play roles in diverse developmental and disease processes. Distinct miRNAs have hundreds to thousands of conserved mRNA binding sites but typically direct only modest repression via single sites. Cotargeting of individual mRNAs by different miRNAs could potentially achieve stronger and more complex patterns of repression. By comparing target sets of different miRNAs, we identified hundreds of pairs of miRNAs that share more mRNA targets than expected (often by twofold or more) relative to stringent controls. Genetic perturbations revealed a functional overlap in neuronal differentiation for the cotargeting pair miR-138/miR-137. Clustering of all cotargeting pairs revealed a group of nine predominantly brain-enriched miRNAs that share many targets. In reporter assays, subsets of these miRNAs together repressed gene expression by five- to 10-fold, often showing cooperative repression. Together, our results uncover an unexpected pattern in which combinations of miRNAs collaborate to robustly repress cotargets, and suggest important developmental roles for cotargeting.
Insights
Combinations of microRNAs (miRNAs) work together to strongly control gene expression. This cotargeting mechanism, involving multiple miRNAs binding to the same messenger RNA, has significant roles in development.
Area of Science:
- Molecular Biology
- Genetics
- Developmental Biology
Background:
- MicroRNAs (miRNAs) are key regulators of gene expression involved in development and disease.
- Individual miRNAs typically cause modest gene repression, despite binding numerous messenger RNAs (mRNAs).
- Co-targeting of mRNAs by multiple miRNAs could lead to more potent and complex gene regulation.
Purpose of the Study:
- To investigate whether combinations of miRNAs cooperatively repress gene expression.
- To identify pairs and groups of miRNAs that share common mRNA targets.
- To explore the functional significance of miRNA cotargeting in biological processes.
Main Methods:
- Comparative analysis of miRNA target sets to identify shared targets.
- Genetic perturbation experiments to assess functional overlap.
- Reporter assays to quantify gene repression by miRNA combinations.
Main Results:
- Hundreds of miRNA pairs with significantly more shared mRNA targets than expected were identified.
- A functional overlap in neuronal differentiation was observed for the cotargeting miRNA pair miR-138/miR-137.
- A group of nine brain-enriched miRNAs was found to share numerous targets, exhibiting cooperative repression (5- to 10-fold) in reporter assays.
Conclusions:
- Combinations of miRNAs collaborate to robustly repress shared mRNA targets.
- MiRNA cotargeting represents an important regulatory mechanism with potential roles in development.
- This study uncovers a novel pattern of miRNA-mediated gene regulation through cooperative action.
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