Abstract
Huntington disease (HD) is the most common neurogenetic disorder caused by expansion of the CAG repeat in the HTT gene; nevertheless, the molecular bases of the disease are not fully understood. Non-coding RNAs have demonstrated to be involved in the physiopathology of HD. However, the role of circRNAs has not been investigated. The aim of this study was to identify the circRNAs with differential expression in a murine cell line model of HD and to identify the biological pathways regulated by the differentially expressed circRNAs. CircRNA expression was analyzed through a microarray, which specifically detects circular species of RNA. The expression patterns between a murine cell line expressing mutant Huntingtin and cells expressing wild-type Huntingtin were compared. We predicted the miRNAs with binding sites for the differentially expressed circRNAs and the corresponding target genes for those miRNAs. Using the target genes, we performed a function enrichment analysis. We identified 23 circRNAs differentially expressed, 19 downregulated and four upregulated. Most of the downregulated circRNAs derive from the Rere gene. The dopaminergic synapse, MAPK, and long-term depression pathways were significantly enriched. The three identified pathways have been previously associated with the physiopathology of HD. The understanding of the circRNA-miRNA-mRNA network involved in the molecular mechanisms driving HD can lead us to identify novel biomarkers and potential therapeutic targets. To the best of our knowledge, this is the first study analyzing circRNAs in a model of Huntington disease.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgments
The authors acknowledge to the Consejo Nacional de Ciencia y Tecnologúa (CONACYT) and to David Rubinsztein from the Cambridge Institute of Medical Research for kindly donate the cell line.
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This research was funded by Consejo Nacional de Ciencia y Tecnologúa (CONACYT) grant number FOSISS-273213
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Research project conception: Alejandra Camacho-Molina, Alberto Hidalgo-Bravo. Execution of experimental procedures: Ernesto Marfil-Marin, Mónica Santamaría-Olmedo, Adriana PerezGrovas-Saltijeral. Data analysis: Margarita Valdes-Flores, Adriana Ochoa-Morales, Aurelio Jara-Prado, Rosalba Sevilla-Montoya, Alejandra Camacho-Molina, Alberto Hidalgo-Bravo. Interpretation of results: Adriana Ochoa-Morales, Aurelio Jara-Prado, Santamaría-Olmedo, Adriana PerezGrovas-Saltijeral, Margarita Valdes-Flores. Draft of the manuscript: Ernesto Marfil-Marin, Rosalba Sevilla-Montoya, Alejandra Camacho-Molina, Alberto Hidalgo-Bravo. All authors reviewed and approved the final version of the manuscript.
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This article employed a modified cell line derived from the organism Rattus norvegicus obtained from the University of Cambridge. No human material was used in this study. This work does not qualify for ethics approval according to the Institutional Ethics Committees from the participant institutions.
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A cell line derived from the organism Rattus norvegicus (RRID:CVCL_0481) was obtained from David Rubinsztein from the Cambridge Institute of Medical Research.
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Marfil-Marin, E., Santamaría-Olmedo, M., PerezGrovas-Saltijeral, A. et al. circRNA Regulates Dopaminergic Synapse, MAPK, and Long-term Depression Pathways in Huntington Disease. Mol Neurobiol 58, 6222–6231 (2021). https://doi.org/10.1007/s12035-021-02536-1
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DOI: https://doi.org/10.1007/s12035-021-02536-1