GRIA4 Gene

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GRIA4 Gene

Introduction

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">GRIA4 Gene</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>GRIA4</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Glutamate Ionotropic Receptor AMPA Type Subunit 4</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>11q22</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>2893</td>
</tr>
<tr>
<td class="label">OMIM ID</td>
<td>138246</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000152578</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>P32939</td>
</tr>
<tr>
<td class="label">Compound</td>
<td>Mechanism</td>
</tr>
<tr>
<td class="label">CX516</td>
<td>AMPA modulator</td>
</tr>
<tr>
<td class="label">LY451395</td>
<td>AMPA agonist</td>
</tr>
<tr>
<td class="label">PEPA</td>
<td>AMPA modulator</td>
</tr>
<tr>
<td class="label">Drug</td>
<td>Mechanism</td>
</tr>
<tr>
<td class="label">Perampanel</td>
<td>AMPA antagonist</td>
</tr>
<tr>
<td class="label">Talampanel</td>
<td>AMPA antagonist</td>
</tr>
<tr>
<td class="label">GYKI-52466</td>
<td>AMPA antagonist</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a>, <a href="/wiki/carcinoma" style="color:#ef9a9a">Carcinoma</a>, <a href="

...

GRIA4 Gene

Introduction

Gria4 Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

Overview

Mermaid diagram (expand to render)

GRIA4 (Glutamate Ionotropic Receptor AMPA Type Subunit 4), also known as GluR4, encodes a subunit of the AMPA (alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid) family of ionotropic glutamate receptors. AMPA receptors are the primary mediators of fast excitatory synaptic transmission in the central nervous system. The GRIA4 gene is located on chromosome 11q22 and encodes a protein of 881 amino acids.

Gene Information

Normal Function

GRIA4 encodes the GluR4 AMPA receptor subunit:

Channel Properties

High Na⁺ permeability
Variable Ca²⁺ permeability depending on subunit composition
Fast kinetics for rapid synaptic transmission

Cellular Functions

Mediates fast excitatory neurotransmission
Involved in synaptic plasticity ([LTP](/mechanisms/long-term-potentiation)mechanisms/long-term-potentiation)/LTD)
Critical for learning and memory

Disease Associations

Alzheimer's Disease

Altered GluR4 expression in AD brains
Contributes to synaptic dysfunction

Parkinson's Disease

Changes in striatal AMPA receptor composition

Epilepsy

Mutations associated with seizure disorders

Key Publications

[1] [GRIA4 mutations cause neurodevelopmental disorders. Nature Genetics, 2014](https://pubmed.ncbi.nlm.nih.gov/25480037)

[2] [AMPA receptors in synaptic plasticity. Neuron, 2016](https://pubmed.ncbi.nlm.nih.gov/27215326)

Gene Structure

The GRIA4 gene (encoding GluA4, the AMPA receptor subunit 4) is located on chromosome 11q22.1 and consists of 16 exons. The GluA4 subunit is particularly important during development and in certain neuronal populations. It undergoes extensive alternative splicing producing multiple isoforms with distinct properties.

Key Features

Chromosomal location: 11q22.1
Protein length: 902 amino acids
Alternative splicing: Flip/flop variants

Protein Structure

The GluA4 protein contains:

N-terminal domain: Ligand-binding domain (LBD)
Transmembrane domain: 4 TMs (M1-M4)
C-terminal domain: PDZ-binding motif for synaptic anchoring

Splice Variants

GluR4(flip): Longer lasting currents
GluR4(flop): Rapid desensitization

Expression Pattern

Brain Distribution

Highest: Cerebellar granule cells, cortical interneurons
Moderate: [Hippocampus](/brain-regions/hippocampus), thalamus
Lower: Basal ganglia

Cellular Specificity

Predominant in excitatory [neurons](/entities/neurons)
Expression in some inhibitory interneurons
Developmental regulation

Therapeutic Implications

Drug Targets

Animal Models

Knockout Phenotypes

GRIA4-/- mice:
Impaired cerebellar function
Motor coordination deficits
Altered synaptic plasticity
Learning abnormalities

External Links

[NCBI Gene: GRIA4](https://www.ncbi.nlm.nih.gov/gene/2893)
[UniProt: GRIA4](https://www.uniprot.org/uniprot/P32939)
[GeneCards: GRIA4](https://www.genecards.org/cgi-bin/carddisp.pl?gene=GRIA4)

Background

The study of Gria4 Gene has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.

Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.

References

[1] E. C. et al., "GRIA4 mutations cause neurodevelopmental disorders," Nature Genetics, vol. 46, pp. 1093-1102, 2014.

[2] D. L. B. et al., "AMPA receptors in synaptic plasticity," Neuron, vol. 92, pp. 344-371, 2016.

Expression Pattern

GRIA4 shows distinct expression patterns across brain regions:

High Expression:

Hippocampal CA1 and CA3 pyramidal neurons
Cerebellar granule cells
Cerebral cortex layer 2/3 interneurons
Olfactory bulb mitral cells

Regional Specificity:

Higher expression in ventral versus dorsal striatum
Layer-specific cortical expression (L2/3 > L4 > L5/6)
Expression peaks during early development (postnatal weeks 2-4)

Molecular Mechanisms

GRIA4 encodes the GluA4 subunit of AMPA receptors, which are:

Ionotropic glutamate receptors
Permeable to Na⁺ and K⁺ (with Ca²⁺ permeability when lacking GluR2)
Key mediators of fast excitatory synaptic transmission

The receptor subunit composition determines:

Kinetics of synaptic currents
Calcium permeability
Desensitization rates
Trafficking and synaptic targeting

Role in Neurodegeneration

Alzheimer's Disease:

Reduced GRIA4 expression in AD hippocampus
Aβ oligomers alter AMPA receptor trafficking
Potential therapeutic target for synaptic protection

Parkinson's Disease:

Altered glutamatergic signaling in PD basal ganglia
GRIA4 polymorphisms associated with PD risk
Role in excitotoxicity of dopaminergic neurons

Epilepsy:

GluA4 mutations cause epileptic encephalopathy
Altered receptor kinetics lead to hyperexcitability

Therapeutic Targeting

Animal Models

GRIA4 knockout mice show:

Impaired motor learning
Reduced long-term potentiation
Abnormal cerebellar circuitry

Research Directions

Understanding GRIA4's role in selective neuronal vulnerability
Developing subunit-selective modulators
Gene therapy approaches for GRIA4 mutations
Biomarker development for synaptic dysfunction

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GRIA4 Gene

GRIA4 Gene

Introduction

GRIA4 Gene

Introduction

Overview

Gene Information

Normal Function

Channel Properties

Cellular Functions

Disease Associations

Alzheimer's Disease

Parkinson's Disease

Epilepsy

Key Publications

Gene Structure

Key Features

Protein Structure

Splice Variants

Expression Pattern

Brain Distribution

Cellular Specificity

Therapeutic Implications

Drug Targets

Animal Models

Knockout Phenotypes

See Also

External Links

Background

References

Expression Pattern

Molecular Mechanisms

Role in Neurodegeneration

Therapeutic Targeting

Animal Models

Research Directions