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Published on: February 27, 2018
miR-34a-5p as molecular hub of pathomechanisms in Huntington's disease
Martin Hart1, Caroline Diener2, Laetitia Lunkes2
1Institute of Human Genetics, Saarland University, Building 60, 66421, Homburg, Germany. martin.hart@uks.eu.
Background:
Although a pivotal role of microRNA (miRNA, miR) in the pathogenesis of Huntington's disease (HD) is increasingly recognized, the molecular functions of miRNAs in the pathomechanisms of HD await further elucidation. One of the miRNAs that have been associated with HD is miR-34a-5p, which was deregulated in the mouse R6/2 model and in human HD brain tissues.
Methods:
The aim of our study was to demonstrate interactions between miR-34a-5p and HD associated genes. By computational means we predicted 12 801 potential target genes of miR-34a-5p. An in-silico pathway analysis revealed 22 potential miR-34a-5p target genes in the KEGG (Kyoto Encyclopedia of Genes and Genomes) pathway "Huntington's disease".
Results:
Using our high-throughput miRNA interaction reporter assay (HiTmIR) we identified NDUFA9, TAF4B, NRF1, POLR2J2, DNALI1, HIP1, TGM2 and POLR2G as direct miR-34a-5p target genes. Direct binding of miR-34a-5p to target sites in the 3'UTRs of TAF4B, NDUFA9, HIP1 and NRF1 was verified by a mutagenesis HiTmIR assay and by determining endogenous protein levels for HIP1 and NDUFA9. STRING (Search Tool for the Retrieval of Interacting Genes/Proteins) analysis identified protein-protein interaction networks associated with HD like "Glutamine Receptor Signaling Pathway" and "Calcium Ion Transmembrane Import Into Cytosol".
Conclusion:
Our study demonstrates multiple interactions between miR-34a-5p and HD associated target genes and thereby lays the ground for future therapeutic interventions using this miRNA.
Insights
MicroRNA-34a-5p directly interacts with genes linked to Huntington's disease (HD). This discovery provides a foundation for developing new miRNA-based therapeutic strategies for HD.
Area of Science:
- Neuroscience
- Genetics
- Molecular Biology
Background:
- MicroRNAs (miRNAs) play a recognized role in Huntington's disease (HD) pathogenesis.
- Specific molecular functions of miRNAs in HD require further investigation.
- miR-34a-5p is deregulated in HD models and human brain tissue.
Purpose of the Study:
- To investigate the interactions between miR-34a-5p and genes associated with Huntington's disease.
- To identify direct gene targets of miR-34a-5p involved in HD.
Main Methods:
- Computational prediction of miR-34a-5p target genes.
- In-silico pathway analysis using KEGG database for HD-related pathways.
- High-throughput miRNA interaction reporter assay (HiTmIR) to validate direct targets.
- Mutagenesis HiTmIR assay and protein level analysis for verification.
- STRING analysis for protein-protein interaction networks.
Main Results:
- Identified 22 potential miR-34a-5p targets within the "Huntington's disease" KEGG pathway.
- Validated NDUFA9, TAF4B, NRF1, HIP1, POLR2J2, DNALI1, TGM2, and POLR2G as direct miR-34a-5p targets.
- Confirmed direct binding of miR-34a-5p to 3'UTRs of TAF4B, NDUFA9, HIP1, and NRF1.
- Observed protein level changes for HIP1 and NDUFA9.
- Identified protein-protein interaction networks including "Glutamine Receptor Signaling Pathway".
Conclusions:
- Demonstrated multiple interactions between miR-34a-5p and HD-associated genes.
- Established miR-34a-5p as a key regulator in Huntington's disease pathways.
- Findings support the potential of miR-34a-5p as a therapeutic target for HD.
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