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A Reporter Assay to Analyze Intronic microRNA Maturation in Mammalian Cells
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DGCR8-dependent efficient pri-miRNA processing of human pri-miR-9-2
Masahiro Nogami1, Kazumasa Miyamoto2, Yoshika Hayakawa-Yano3
1Innovative Biology Laboratories, Neuroscience Drug Discovery Unit, Research, Takeda Pharmaceutical Company Limited, Fujisawa, Kanagawa, Japan; Shonan Incubation Laboratories, Takeda Pharmaceutical Company Limited, Fujisawa, Kanagawa, Japan.
The Journal of Biological Chemistry
|February 13, 2021
Summary
DiGeorge syndrome critical region gene 8 (DGCR8) efficiency varies for different microRNAs (miRNAs), potentially linking DGCR8 disruption to schizophrenia risk. A novel DGCR8-responsive element in pri-miR-9-2 may be key.
Area of Science:
- Molecular Biology
- Genetics
- Neuroscience
Background:
- The microprocessor complex, containing DGCR8 and DROSHA, processes primary microRNAs (pri-miRNAs) for canonical miRNA maturation.
- DGCR8 haploinsufficiency shows variable efficiency across miRNA species, implicated in schizophrenia risk associated with 22q11 deletion syndrome.
- The precise mechanisms behind DGCR8's differential activity on various miRNAs are not fully understood.
Purpose of the Study:
- To investigate the varying efficiency of DGCR8-dependent microprocessor activity on different pri-miRNAs.
- To identify specific miRNA targets and regulatory elements involved in DGCR8 processing.
- To explore potential links between DGCR8-miRNA interactions and schizophrenia risk.
Main Methods:
- Utilized an in vivo monitoring system with ratiometric fluorescence reporters to measure DGCR8-dependent microprocessor activity in cultured cells.
- Validated the system's ability to recapitulate endogenous pri-miRNA processing.
- Analyzed DGCR8-responsive RNA elements and their conservation across species.
Main Results:
- Confirmed DGCR8-dependent microprocessor activity using the developed reporter system.
- Identified microRNA-9-2 (mir-9-2) as a highly efficient DGCR8 target.
- Discovered a novel, conserved DGCR8-responsive RNA element potentially regulated at the epitranscriptome level.
Conclusions:
- The study provides a system to measure DGCR8 activity and reveals differential processing of pri-miRNAs.
- Pri-miR-9-2 processing by DGCR8, influenced by a novel RNA element, may contribute to schizophrenia risk in 22q11 deletion syndrome.
- Further research into DGCR8-miRNA interactions and epitranscriptomic regulation is warranted.
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