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Updated: Jun 28, 2026
09:07
Prediction and Validation of Gene Regulatory Elements Activated During Retinoic Acid Induced Embryonic Stem Cell Differentiation
Published on: June 21, 2016
The immediate early gene arc/arg3.1: regulation, mechanisms, and function
Clive R Bramham1, Paul F Worley, Melissa J Moore
1Department of Biomedicine and Bergen Mental Health Research Center, University of Bergen, 5009 Bergen, Norway. clive.bramham@biomed.uib.no
Summary
The activity-regulated cytoskeleton-associated protein (Arc) is crucial for synaptic plasticity and memory. Arc protein regulates AMPA receptor trafficking and F-actin dynamics, essential for learning and memory consolidation.
Area of Science:
- Neuroscience
- Molecular Biology
- Synaptic Plasticity
Background:
- Arc (Arg3.1) is a unique activity-regulated immediate early gene (IEG) with mRNA rapidly transported to dendrites for local translation.
- Little is known about Arc's neuronal and behavioral functions or its molecular mechanisms.
- Recent advances have elucidated Arc's regulation, plasticity functions, and role in neural networks.
Purpose of the Study:
- To review recent advances in understanding the regulation and function of Arc.
- To explore Arc's role in neuronal plasticity, including LTP, LTD, and homeostatic plasticity.
- To discuss Arc's broader role in the neural networks of behaving animals.
Main Methods:
- Investigated Arc's interaction with endophilin and dynamin for AMPA receptor trafficking.
- Examined Arc's dependence in LTD and homeostatic plasticity via AMPA receptor endocytosis.
- Analyzed Arc translation control by elongation factor 2 in LTD.
- Studied Arc mRNA translation necessity for F-actin cytoskeleton expansion in LTP consolidation.
- Assessed Arc mRNA as a target for nonsense-mediated mRNA decay (NMD).
- Observed Arc transcription activation by location-specific neuronal firing in behaving rats.
Main Results:
- Arc mediates AMPA receptor endocytosis, critical for hippocampal LTD and homeostatic plasticity.
- Rapid Arc translation is essential for LTD evoked by metabotropic glutamate receptors.
- Sustained Arc translation supports F-actin cytoskeleton expansion and LTP consolidation in rats.
- Nonsense-mediated mRNA decay (NMD) fine-tunes Arc synthesis.
- Neuronal firing patterns activate Arc transcription, influencing memory processes.
Conclusions:
- Arc is a versatile regulator coupling neuronal activity to synaptic plasticity.
- Arc optimizes information storage in active neural networks through diverse mechanisms.
- Arc's functions are finely tuned by transcriptional and posttranscriptional regulation, including NMD and neuromodulatory inputs.
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