RNA-RNA interactions coordinate GABA metabolism and signaling
Biorxiv : the Preprint Server for Biology
|September 15, 2025
Summary
A novel long non-coding RNA, CG14989, coordinates the expression of genes essential for GABAergic neuron function in Drosophila. This RNA regulates the translation of the vesicular GABA transporter (VGAT), ensuring proper nervous system activity.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- Proper nervous system function relies on precise regulation of GABA production, signaling, and degradation.
- Gene regulatory mechanisms controlling GABAergic neurotransmission are not fully understood.
Purpose of the Study:
- To identify post-transcriptional mechanisms coordinating gene expression in GABAergic neurons.
- To elucidate the role of CG14989 in regulating GABA synthetase (Gad1) and vesicular GABA transporter (VGAT) expression.
Main Methods:
- Analysis of mRNA expression patterns for Gad1 and VGAT in Drosophila.
- Identification and characterization of the long non-coding RNA CG14989.
- Ectopic expression experiments to assess CG14989 function in VGAT translation.
Main Results:
- Gad1 is transcribed specifically in GABAergic neurons, while VGAT mRNA is broadly transcribed but selectively translated.
- CG14989, a lncRNA adjacent to Gad1, shares GABAergic expression and antagonizes miR-7-mediated repression of VGAT translation.
- CG14989 demonstrated sufficiency in driving VGAT translation in non-GABAergic neurons.
Conclusions:
- CG14989 acts as a post-transcriptional regulator coordinating VGAT expression in GABAergic neurons.
- This mechanism highlights a novel role for lncRNAs in establishing neuronal identity.
- CG14989 may serve as a regulatory hub for multiple GABA-related genes, impacting neuronal function.
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