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RNA Helicase DDX6 Regulates A-to-I Editing and Neuronal Differentiation in Human Cells
Chia-Yu Shih1, Yun-Chi Chen1, Heng-Yi Lin1
1Department of Life Science, College of Life Science, National Taiwan University, Taipei 10617, Taiwan.
International Journal of Molecular Sciences
|February 25, 2023
Summary
DEAD-box helicase 6 (DDX6) interacts with adenosine deaminases acting on RNA (ADARs) in the nucleus, regulating RNA editing and neuronal differentiation. This study uncovers a novel nuclear function for DDX6 in gene expression control.
Area of Science:
- Molecular Biology
- Cell Biology
- Neuroscience
Background:
- DEAD-box proteins, including DDX6, are RNA-binding proteins crucial for post-transcriptional gene regulation.
- DDX6 is known for its cytoplasmic roles in RNA processing bodies (P-bodies), affecting translation, silencing, and decay.
- The nuclear function of DDX6 remains largely uncharacterized.
Purpose of the Study:
- To investigate the unknown nuclear functions of DDX6.
- To identify nuclear interacting partners of DDX6.
- To elucidate DDX6's role in RNA editing and neuronal differentiation.
Main Methods:
- Mass spectrometry-based immunoprecipitation of DDX6 from HeLa nuclear extracts.
- Development and utilization of a dual-fluorescence reporter assay.
- Depletion studies of DDX6 and ADARs in neuronal lineage cells.
Main Results:
- DDX6 was found to interact with adenosine deaminases that act on RNA 1 (ADAR1) in the nucleus.
- DDX6 acts as a negative regulator of cellular ADAR1p110 and ADAR2.
- Depletion of DDX6 and ADARs differentially affects retinoic acid-induced neuronal differentiation.
Conclusions:
- DDX6 plays a significant role in regulating cellular RNA editing levels within the nucleus.
- DDX6 contributes to neuronal differentiation through its regulation of RNA editing.
- The findings reveal a novel nuclear function for DDX6 in gene expression and cellular differentiation.
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