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Detection of miRNA Targets in High-throughput Using the 3'LIFE Assay
Published on: May 25, 2015
Identification of the miRNA targetome in hippocampal neurons using RIP-seq
Josephine Malmevik1, Rebecca Petri1, Thies Klussendorf1
1Laboratory of Molecular Neurogenetics, Department of Experimental Medical Science, Wallenberg Neuroscience Center and Lund Stem Cell Center, Lund University, SE-221 84 Lund, Sweden.
Abstract:
MicroRNAs (miRNAs) are key players in the regulation of neuronal processes by targeting a large network of target messenger RNAs (mRNAs). However, the identity and function of mRNAs targeted by miRNAs in specific cells of the brain are largely unknown. Here, we established an adeno-associated viral vector (AAV)-based neuron-specific Argonaute2:GFP-RNA immunoprecipitation followed by high-throughput sequencing to analyse the regulatory role of miRNAs in mouse hippocampal neurons. Using this approach, we identified more than two thousand miRNA targets in hippocampal neurons, regulating essential neuronal features such as cell signalling, transcription and axon guidance. Furthermore, we found that stable inhibition of the highly expressed miR-124 and miR-125 in hippocampal neurons led to significant but distinct changes in the AGO2 binding of target mRNAs, resulting in subsequent upregulation of numerous miRNA target genes. These findings greatly enhance our understanding of the miRNA targetome in hippocampal neurons.
Insights
Researchers identified over two thousand microRNA (miRNA) targets in mouse hippocampal neurons, revealing their roles in neuronal processes. Inhibiting key miRNAs altered target gene expression, enhancing understanding of miRNA regulation in the brain.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- MicroRNAs (miRNAs) regulate neuronal processes by targeting messenger RNAs (mRNAs).
- The specific mRNA targets of miRNAs in brain cells remain largely uncharacterized.
Purpose of the Study:
- To identify and characterize miRNA targets in mouse hippocampal neurons.
- To investigate the functional impact of miRNA regulation on neuronal processes.
Main Methods:
- Developed an adeno-associated viral vector (AAV)-based method for neuron-specific Argonaute2:GFP-RNA immunoprecipitation.
- Utilized high-throughput sequencing to analyze miRNA targets in hippocampal neurons.
- Investigated the effects of inhibiting miR-124 and miR-125 on AGO2 binding and target gene expression.
Main Results:
- Identified over two thousand miRNA targets in hippocampal neurons.
- These targets are involved in crucial neuronal functions including cell signaling, transcription, and axon guidance.
- Inhibition of miR-124 and miR-125 caused distinct changes in AGO2 binding and upregulated numerous target genes.
Conclusions:
- This study significantly expands the understanding of the miRNA targetome in hippocampal neurons.
- Provides novel insights into the regulatory roles of specific miRNAs in neuronal function.
- Highlights the importance of miRNAs in controlling gene expression networks essential for neuronal processes.
