RNC (RNA Binding Domain Containing), also known as DGCR8 (DiGeorge Syndrome Critical Region 8), is an essential protein in the microRNA (miRNA) biogenesis pathway. RNC forms the microprocessor complex with Drosha to process primary microRNA (pri-miRNA) transcripts into precursor microRNAs (pre-miRNAs). This function is critical for post-transcriptional gene regulation in [neurons](/entities/neurons) and is implicated in synaptic plasticity, neuronal development, and neurodegenerative disease pathogenesis.
Introduction
MicroRNAs are small non-coding RNAs that regulate gene expression post-transcriptionally by binding to target mRNAs and inhibiting their translation or promoting degradation. The microprocessor complex, consisting of RNC/DGCR8 and Drosha, initiates miRNA maturation in the nucleus. RNC acts as the molecular anchor that recognizes the pri-miRNA hairpin structure, while Drosha performs the cleavage reaction [@microprocessor].
In the brain, miRNAs regulate numerous processes including synaptic plasticity, neurogenesis, and neuronal survival. Dysregulation of miRNA processing is implicated in Alzheimer's disease, Parkinson's disease, and other neurodegenerative disorders.
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RNC — RNA Binding Domain Containing
Overview
RNC (RNA Binding Domain Containing), also known as DGCR8 (DiGeorge Syndrome Critical Region 8), is an essential protein in the microRNA (miRNA) biogenesis pathway. RNC forms the microprocessor complex with Drosha to process primary microRNA (pri-miRNA) transcripts into precursor microRNAs (pre-miRNAs). This function is critical for post-transcriptional gene regulation in [neurons](/entities/neurons) and is implicated in synaptic plasticity, neuronal development, and neurodegenerative disease pathogenesis.
Introduction
MicroRNAs are small non-coding RNAs that regulate gene expression post-transcriptionally by binding to target mRNAs and inhibiting their translation or promoting degradation. The microprocessor complex, consisting of RNC/DGCR8 and Drosha, initiates miRNA maturation in the nucleus. RNC acts as the molecular anchor that recognizes the pri-miRNA hairpin structure, while Drosha performs the cleavage reaction [@microprocessor].
In the brain, miRNAs regulate numerous processes including synaptic plasticity, neurogenesis, and neuronal survival. Dysregulation of miRNA processing is implicated in Alzheimer's disease, Parkinson's disease, and other neurodegenerative disorders.
N-terminal region: Contains the Drosha-binding site
Central dsRBDs (2x): Bind pri-miRNA hairpin structures
C-terminal dsRBD: Additional RNA binding capacity
WW domain: Protein-protein interactions
Nuclear-Cytoplasmic Trafficking
Following nuclear processing by the microprocessor, pre-miRNAs are exported to the cytoplasm by Exportin-5, where they undergo final processing by Dicer to generate mature miRNAs.
Expression Pattern
RNC/DGCR8 is ubiquitously expressed with high expression in [@dgcrb]: