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Post-transcriptional control of DGCR8 expression by the Microprocessor
RNA (New York, N.Y.)
|April 23, 2009
Summary
The Microprocessor complex, essential for microRNA biogenesis, negatively regulates DGCR8 expression through cleavage of a hairpin in the DGCR8 mRNA 5'UTR, revealing a novel feedback loop.
Area of Science:
- Molecular Biology
- Gene Regulation
Background:
- MicroRNA (miRNA) biogenesis is crucial for cellular function and relies on the Microprocessor complex, containing RNase III Drosha and DGCR8.
- The precise regulatory mechanisms governing Drosha and DGCR8 protein expression remain largely uncharacterized.
Discussion:
- This study identifies a negative feedback loop where the Microprocessor complex directly regulates DGCR8 expression.
- Cleavage of a specific hairpin structure within the DGCR8 mRNA 5' untranslated region (5'UTR) by the Microprocessor complex mediates this regulation.
Key Insights:
- Knockdown of Drosha results in elevated DGCR8 mRNA and protein levels, supporting Microprocessor-dependent repression.
- The DGCR8 5'UTR confers Microprocessor-dependent repression on a luciferase reporter gene in vivo, confirming the functional role of this regulatory element.
Outlook:
- This discovery elucidates a novel regulatory mechanism controlling DGCR8 levels, impacting miRNA biogenesis.
- Further research can explore the implications of this feedback loop in various biological contexts and diseases.
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