GO:0090394 negative regulation of excitatory postsynaptic potential: Synaptic Plasticity, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0090394 describes any process that prevents or reduces the excitatory postsynaptic potential (EPSP), the transient depolarization caused by positive ion flow into the postsynaptic neuron.
• This term is a biological_process and is essential for controlling neuronal excitability, preventing hyperexcitation, and shaping synaptic plasticity [2,8].
• Key molecular players include GABA-A receptor-associated proteins like Clptm1, which enhance inhibitory neurotransmission and suppress excitatory synaptic plasticity.
• Cholesterol levels in the membrane modulate both presynaptic and postsynaptic properties of excitatory synaptic transmission, thereby influencing EPSP magnitude.
• Proteins such as DEPDC5 regulate excitatory synaptic strength by interacting with ubiquitin-specific protease 46, linking mTOR signaling to negative regulation of EPSP.
• Dysregulation of negative regulation of EPSP is implicated in neurological disorders including epilepsy, memory impairment, and neurodevelopmental conditions [6,8].
Description
The excitatory postsynaptic potential (EPSP) is a temporary depolarization of the postsynaptic membrane caused by the influx of positively charged ions, which makes the neuron more likely to fire an action potential. The Gene Ontology term GO:0090394, negative regulation of excitatory postsynaptic potential, encompasses any biological process that prevents the establishment or decreases the extent of this EPSP. This regulation is critical for maintaining the balance between excitation and inhibition in the central nervous system, and its disruption is associated with a range of neurological and psychiatric disorders. Researchers study this process to understand synaptic plasticity, neural circuit function, and the molecular mechanisms underlying brain diseases [2,6]. Recent evidence highlights the role of membrane cholesterol in modulating both presynaptic and postsynaptic properties of excitatory synaptic transmission, directly affecting EPSP amplitude. Additionally, proteins such as Clptm1 have been shown to enhance inhibitory neurotransmission while suppressing excitatory synaptic plasticity, providing a molecular brake on EPSP generation. Understanding GO:0090394 is therefore essential for neuroscientists aiming to manipulate synaptic strength for therapeutic benefit.
negative regulation of excitatory postsynaptic potential At A Glance
| GO ID | GO:0090394 |
|---|---|
| GO term | negative regulation of excitatory postsynaptic potential |
| Ontology | biological_process |
| Synonym | negative regulation of EPSP; negative regulation of excitatory post-synaptic membrane potential; reduction of excitatory postsynaptic membrane potential |
| Major function | Prevents or decreases the excitatory postsynaptic potential (EPSP), thereby reducing neuronal excitability and shaping synaptic plasticity. |
| Related cellular component | Postsynaptic membrane, presynaptic terminal, synaptic cleft. |
| Related molecular function | Ion channel modulation, receptor clustering, neurotransmitter release regulation [2,8]. |
| Key regulatory proteins | Clptm1, DEPDC5, BAI2/ADGRB2, cholesterol-binding proteins [2,4,6,8]. |
| Associated diseases | Epilepsy, memory impairment, neurodevelopmental disorders [6,8]. |
What Is GO:0090394?
GO:0090394 is defined as any process that prevents the establishment or decreases the extent of the excitatory postsynaptic potential (EPSP), which is a temporary increase in postsynaptic potential due to the flow of positively charged ions into the postsynaptic cell. The flow of ions that causes an EPSP is an excitatory postsynaptic current (EPSC) and makes it easier for the neuron to fire an action potential. In simpler terms, it is the biological brake that reduces the strength of excitatory synaptic signals, helping to keep neuronal activity in check.
Why Is negative regulation of excitatory postsynaptic potential Important in Cell Biology?
Negative regulation of excitatory postsynaptic potential is a fundamental homeostatic mechanism that prevents runaway excitation in neural circuits. Without it, excessive EPSPs can lead to excitotoxicity, seizures, and cognitive deficits. This process is also central to synaptic plasticity, learning, and memory, as it sets the threshold for long-term potentiation and depression. Moreover, it is a target for therapeutic intervention in epilepsy, Alzheimer's disease, and other neurological conditions where excitation-inhibition imbalance is a hallmark [6,8].
• Prevents hyperexcitability and excitotoxicity in the central nervous system.
• Shapes synaptic plasticity and learning by modulating the threshold for action potential firing.
• Involved in the pathophysiology of epilepsy, where loss of negative regulation leads to seizures.
• Contributes to memory impairment when dysregulated, as shown by Clptm1 haploinsufficiency.
• Modulated by membrane cholesterol, linking lipid metabolism to synaptic function.
• Regulated by mTOR signaling through DEPDC5, connecting nutrient sensing to synaptic strength.
• Target for neuroprotective strategies in neurodegenerative diseases.
• Essential for proper development of hippocampal excitatory synapses via BAI2/ADGRB2.
• Influenced by noradrenergic signaling with sex differences in the medial prefrontal cortex.
• Provides a mechanism for homeostatic synaptic scaling in response to chronic activity changes.
What Happens During negative regulation of excitatory postsynaptic potential?
Presynaptic modulation of neurotransmitter release
In simple terms: The sending neuron can release less glutamate, so the receiving neuron gets a weaker excitatory signal.
Negative regulation of EPSP often begins at the presynaptic terminal, where the probability of neurotransmitter release is reduced. Cholesterol levels in the presynaptic membrane modulate the properties of excitatory synaptic transmission, affecting the amount of glutamate released and thus the amplitude of the EPSP. Additionally, presynaptic signaling to gonadotropin-releasing hormone neurons can be metabolically regulated, demonstrating that presynaptic mechanisms contribute to negative regulation of EPSP in specific circuits.
Postsynaptic receptor desensitization and internalization
In simple terms: The receiving neuron can reduce the number or sensitivity of its glutamate receptors, making it less responsive.
At the postsynaptic site, negative regulation of EPSP can occur through decreased function or number of AMPA and NMDA receptors. Cholesterol modulates postsynaptic properties of excitatory synaptic transmission, influencing receptor clustering and function. Furthermore, proteins such as Clptm1 enhance inhibitory neurotransmission and suppress excitatory synaptic plasticity, indirectly reducing EPSP strength by shifting the excitation-inhibition balance.
Inhibitory interneuron activation
In simple terms: Inhibitory neurons release GABA, which counteracts excitation and reduces the EPSP.
Activation of GABAergic interneurons leads to inhibitory postsynaptic potentials (IPSPs) that can shunt or reduce the amplitude of concurrent EPSPs. Clptm1 haploinsufficiency enhances both phasic and tonic inhibitory neurotransmission, which suppresses excitatory synaptic plasticity and impairs memory. This demonstrates that boosting inhibition is a powerful mechanism for negative regulation of EPSP.
Modulation by intracellular signaling pathways
In simple terms: Signaling molecules inside the neuron can change how strongly it responds to glutamate.
Intracellular signaling cascades, including mTOR pathway components, regulate the strength of excitatory synaptic transmission. DEPDC5 interacts with ubiquitin-specific protease 46 to regulate excitatory synaptic strength, and loss of DEPDC5 leads to increased excitatory transmission. This indicates that DEPDC5 is part of a negative regulatory mechanism for EPSP. Additionally, the adhesion G-protein coupled receptor BAI2/ADGRB2 regulates hippocampal excitatory synapse development, further highlighting the role of signaling in negative regulation.
Structural remodeling of synapses
In simple terms: The physical shape and size of synapses can change to weaken excitatory connections.
Long-term negative regulation of EPSP can involve structural changes, such as shrinkage or elimination of dendritic spines. I-BAR proteins, which sense and generate membrane curvature, are present at central synapses and may contribute to structural plasticity underlying negative regulation of EPSP. Cholesterol also influences membrane fluidity and receptor mobility, affecting synaptic structure.
Key Genes Involved in GO:0090394 negative regulation of excitatory postsynaptic potential
The following genes and proteins have been experimentally linked to negative regulation of excitatory postsynaptic potential or related processes.
| Gene | Major Role | Research Relevance |
|---|---|---|
| Clptm1 | Enhances inhibitory neurotransmission and suppresses excitatory synaptic plasticity | Haploinsufficiency impairs memory and increases inhibition |
| DEPDC5 | Regulates excitatory synaptic strength via interaction with USP46 | Mutations associated with epilepsy and mTOR pathway dysregulation |
| BAI2/ADGRB2 | Regulates hippocampal excitatory synapse development | Adhesion GPCR involved in synapse formation and function |
| GABRA1 | GABA-A receptor subunit, mediates inhibitory neurotransmission | Target for enhancing inhibition to reduce EPSP |
| GABRB2 | GABA-A receptor subunit | Modulates phasic inhibition |
| GABRG2 | GABA-A receptor subunit | Associated with epilepsy syndromes |
| GRIA1 | AMPA receptor subunit, mediates fast excitatory transmission | Postsynaptic target for negative regulation |
| GRIN1 | NMDA receptor subunit | Involved in synaptic plasticity |
| GRIN2A | NMDA receptor subunit | Modulates EPSP and plasticity |
| USP46 | Deubiquitinase interacting with DEPDC5 | Regulates excitatory synaptic strength |
| OPRM1 | Mu opioid receptor, modulates excitatory transmission | Presynaptic inhibition of EPSP |
| ADRA1A | Alpha-1 adrenergic receptor | Noradrenergic regulation of prefrontal cortex |
| ADRA2A | Alpha-2 adrenergic receptor | Presynaptic inhibition of glutamate release |
| CHRNA7 | Nicotinic acetylcholine receptor | Modulates presynaptic release |
| GRM2 | Metabotropic glutamate receptor 2 | Presynaptic inhibition of glutamate release |
| GRM3 | Metabotropic glutamate receptor 3 | Regulates glutamate release |
| SLC1A2 | Glutamate transporter | Clears synaptic glutamate, reducing EPSP |
How Is negative regulation of excitatory postsynaptic potential Regulated?
Negative regulation of excitatory postsynaptic potential is itself regulated by multiple signaling pathways. The mTOR pathway, through DEPDC5, controls excitatory synaptic strength by interacting with USP46; loss of DEPDC5 increases excitatory transmission, indicating that DEPDC5 normally restrains EPSP. Cholesterol levels in the plasma membrane modulate both presynaptic and postsynaptic properties of excitatory synaptic transmission, thereby regulating EPSP amplitude. Noradrenergic signaling in the medial prefrontal cortex shows sex differences in its regulation of excitatory transmission, suggesting hormonal modulation. Additionally, GABA-A receptor-associated proteins like Clptm1 enhance inhibitory neurotransmission, which in turn negatively regulates EPSP.
negative regulation of excitatory postsynaptic potential and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| DEPDC5 | Epilepsy, mTORopathy | Knockout mouse, patient iPSC-derived neurons |
| Clptm1 | Memory impairment, cognitive deficits | Haploinsufficient mouse, overexpression cell model |
| BAI2/ADGRB2 | Neurodevelopmental disorders | Knockout mouse, knockdown in hippocampal cultures |
| GABRA1 | Epilepsy, anxiety | Point mutation knock-in mouse |
| GRIN2A | Epilepsy, schizophrenia | Knock-in mouse with patient mutations |
Epilepsy and seizure disorders
Mutations in DEPDC5, a negative regulator of excitatory synaptic strength, are associated with epilepsy. DEPDC5 regulates excitatory synaptic transmission by interacting with USP46, and its dysfunction leads to increased excitatory transmission, which can cause seizures. This highlights the importance of negative regulation of EPSP in preventing hyperexcitability.
Memory impairment and cognitive disorders
Haploinsufficiency of Clptm1, which enhances inhibitory neurotransmission and suppresses excitatory synaptic plasticity, impairs memory. This suggests that disruption of negative regulation of EPSP can lead to cognitive deficits, relevant to Alzheimer's disease and other dementias.
Neurodevelopmental disorders
BAI2/ADGRB2 regulates hippocampal excitatory synapse development, and its dysfunction may contribute to neurodevelopmental disorders characterized by altered excitation-inhibition balance. Proper negative regulation of EPSP is essential for normal circuit formation.
From negative regulation of excitatory postsynaptic potential-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of DEPDC5 increase EPSP? | DEPDC5 knockout mouse or CRISPR KO in neurons |
| Does Clptm1 haploinsufficiency impair memory? | Clptm1 heterozygous knockout mouse |
| How does cholesterol affect EPSP? | Cholesterol depletion in cultured neurons |
| Does BAI2/ADGRB2 regulate synapse development? | BAI2 knockout mouse or shRNA knockdown |
| Does noradrenergic signaling modulate EPSP in a sex-specific manner? | Conditional KO of adrenergic receptors in mice |
| Can enhancing inhibition rescue epilepsy? | GABA-A receptor positive allosteric modulators in KO mice |
How to Study the negative regulation of excitatory postsynaptic potential Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Patch-clamp electrophysiology | EPSP amplitude, frequency, kinetics | Assess negative regulation in neurons |
| Miniature EPSC analysis | Presynaptic release probability | Determine site of regulation |
| Calcium imaging | Intracellular calcium transients | Monitor synaptic activity |
| Co-immunoprecipitation | Protein-protein interactions | Identify regulatory complexes |
| Western blot | Protein expression levels | Quantify receptor subunits |
| CRISPR knockout | Loss-of-function effects | Test gene necessity |
| CRISPR knock-in | Mutant protein function | Model patient mutations |
| RNA-seq | Transcriptional changes | Identify downstream pathways |
Electrophysiology
Patch-clamp recordings measure EPSPs and EPSCs directly, allowing quantification of negative regulation. Miniature EPSC analysis reveals presynaptic and postsynaptic contributions [2,8].
Fluorescence imaging
Live-cell imaging of synaptic markers and calcium indicators visualizes synaptic activity and structural changes underlying negative regulation of EPSP.
Molecular biology and biochemistry
Co-immunoprecipitation, Western blotting, and ubiquitination assays uncover protein interactions such as DEPDC5-USP46.
Genetic manipulation
CRISPR/Cas9 knockout, knock-in, and overexpression in cell lines and primary neurons model disease mutations and test causality [6,8].
How CRISPR Can Be Used to Study GO:0090394 negative regulation of excitatory postsynaptic potential
Knockout
CRISPR knockout of genes like DEPDC5 or Clptm1 in neurons or cell lines can reveal their role in negative regulation of EPSP. For example, DEPDC5 knockout increases excitatory synaptic strength, confirming its negative regulatory function.
Point Mutation
Introducing patient-specific point mutations (e.g., in GABRA1 or GRIN2A) via CRISPR base editing or HDR allows study of how these mutations affect EPSP regulation and disease phenotypes.
Knock-in
Knock-in of tagged proteins (e.g., GFP-tagged Clptm1) enables live imaging and proteomic analysis of regulatory complexes at synapses.
Overexpression
Overexpression of negative regulators like Clptm1 or BAI2/ADGRB2 can suppress excitatory transmission, providing gain-of-function models to study synaptic homeostasis [4,8].
How EDITGENE Supports negative regulation of excitatory postsynaptic potential Research
Researchers studying negative regulation of excitatory postsynaptic potential-related genes often need to determine whether a candidate gene is causally involved in modulating EPSP. EDITGENE provides comprehensive CRISPR services to generate precisely engineered cell and animal models, accelerating discovery in synaptic biology.
Contact EDITGENE today to design your custom CRISPR model for negative regulation of excitatory postsynaptic potential research.
Frequently Asked Questions About negative regulation of excitatory postsynaptic potential
What is GO:0090394?
GO:0090394 is the Gene Ontology term for negative regulation of excitatory postsynaptic potential, describing any process that reduces or prevents the EPSP, a key mechanism for controlling neuronal excitability.
What genes are involved in negative regulation of excitatory postsynaptic potential?
Key genes include Clptm1, DEPDC5, BAI2/ADGRB2, and GABA-A receptor subunits such as GABRA1, which modulate excitatory synaptic strength [4,6,8].
How does cholesterol affect excitatory postsynaptic potential?
Cholesterol in the membrane modulates both presynaptic and postsynaptic properties of excitatory synaptic transmission, thereby influencing EPSP amplitude.
What is the role of DEPDC5 in EPSP regulation?
DEPDC5 regulates excitatory synaptic strength by interacting with USP46; loss of DEPDC5 increases excitatory transmission, indicating it normally restrains EPSP.
How does Clptm1 regulate excitatory synaptic plasticity?
Clptm1 enhances inhibitory neurotransmission and suppresses excitatory synaptic plasticity; its haploinsufficiency impairs memory.
What diseases are associated with dysregulation of EPSP?
Dysregulation of EPSP is linked to epilepsy, memory impairment, and neurodevelopmental disorders [6,8].
What research methods are used to study negative regulation of EPSP?
Patch-clamp electrophysiology, calcium imaging, co-immunoprecipitation, and CRISPR knockout/knock-in models are commonly used [2,6,8].
Can CRISPR be used to study negative regulation of EPSP?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models allow precise manipulation of genes involved in EPSP regulation [6,8].
What is the role of BAI2/ADGRB2 in excitatory synapses?
BAI2/ADGRB2 regulates hippocampal excitatory synapse development, influencing synaptic strength and plasticity.
How does noradrenergic signaling affect EPSP?
Noradrenergic signaling in the medial prefrontal cortex regulates excitatory transmission with sex differences, modulating EPSP.
Conclusion
Negative regulation of excitatory postsynaptic potential (GO:0090394) is a critical biological process that maintains the balance between excitation and inhibition in the brain. It involves presynaptic, postsynaptic, and intracellular mechanisms, with key roles for proteins such as Clptm1, DEPDC5, and BAI2/ADGRB2 [4,6,8]. Dysregulation of this process contributes to epilepsy, memory impairment, and neurodevelopmental disorders, making it a promising therapeutic target [6,8]. Advances in CRISPR-based models and electrophysiological methods continue to unravel the molecular underpinnings of this regulation, offering new avenues for treating neurological diseases.
References
- 1. Herman TF et al.. 2026. Mu Receptors.. PMID: 31855381
- 2. Korinek M et al.. 2020. Cholesterol modulates presynaptic and postsynaptic properties of excitatory synaptic transmission.. Sci Rep 10(1):12651 PMID: 32724221
- 3. Chatzi C et al.. 2021. Revisiting I-BAR Proteins at Central Synapses.. Front Neural Circuits 15:787436 PMID: 34975417
- 4. Meyer CM et al.. 2025. Regulation of hippocampal excitatory synapse development by the adhesion G-protein coupled receptor brain-specific angiogenesis inhibitor 2 (BAI2/ADGRB2).. Mol Cell Neurosci 134:104015 PMID: 40451404
- 5. Scroger MV et al.. 2025. Sex differences in noradrenergic regulation of the medial prefrontal cortex in mice.. Biol Sex Differ 16(1):97 PMID: 41225565
- 6. Cerullo MS et al.. 2025. DEPDC5 regulates the strength of excitatory synaptic transmission by interacting with ubiquitin-specific protease 46.. Neurobiol Dis 212:106985 PMID: 40467011
- 7. Sullivan SD et al.. 2003. Metabolic regulation of fertility through presynaptic and postsynaptic signaling to gonadotropin-releasing hormone neurons.. J Neurosci 23(24):8578-85 PMID: 13679427
- 8. Ge Y et al.. 2024. Haploinsufficiency of GABA(A) Receptor-Associated Clptm1 Enhances Phasic and Tonic Inhibitory Neurotransmission, Suppresses Excitatory Synaptic Plasticity, and Impairs Memory.. J Neurosci 44(32) PMID: 38942471
