GRIA1 Gene

GRIA1 Gene

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">GRIA1 Gene</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>GRIA1</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Glutamate Ionotropic Receptor AMPA Type Subunit 1</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>5q31.1</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>2891</td>
</tr>
<tr>
<td class="label">OMIM ID</td>
<td>138248</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000155545</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>P42262</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/huntington" style="color:#ef9a9a">Huntington</a>, <a href="/wiki/ms" style="color:#ef9a9a">Ms</a>, <a href="/wiki/parkinson" style="color:#ef9a9a">Parkinson</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">58 edges</a></td>
</tr>
</table>

Introduction

Gria1 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

...

GRIA1 Gene

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">GRIA1 Gene</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>GRIA1</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Glutamate Ionotropic Receptor AMPA Type Subunit 1</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>5q31.1</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>2891</td>
</tr>
<tr>
<td class="label">OMIM ID</td>
<td>138248</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000155545</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>P42262</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/huntington" style="color:#ef9a9a">Huntington</a>, <a href="/wiki/ms" style="color:#ef9a9a">Ms</a>, <a href="/wiki/parkinson" style="color:#ef9a9a">Parkinson</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">58 edges</a></td>
</tr>
</table>

Introduction

Gria1 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

The GRIA1 gene encodes the GluA1 subunit of the AMPA (alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid) glutamate receptor, a ligand-gated ion channel that mediates fast excitatory synaptic transmission in the brain. AMPA receptors containing the GluA1 subunit are critical for synaptic plasticity, learning, and memory. GRIA1 mutations are associated with neurodevelopmental disorders and epilepsy. [@henley2019]

This gene is involved in: [@wang2020]

• Fast synaptic transmission: Mediates rapid excitatory signaling
• Synaptic plasticity: Critical for [long-term potentiation](/mechanisms/long-term-potentiation)
• Learning and memory: Required for hippocampal synaptic plasticity
• Disease associations: Epilepsy, autism, intellectual disability, Alzheimer's disease

GRIA1 (Glutamate Ionotropic Receptor AMPA Type Subunit 1) encodes the GluA1 subunit of the AMPA-type glutamate receptor, the primary mediator of fast excitatory synaptic transmission in the mammalian brain. [@liu2021]

Gene Overview

Normal Function

The GRIA1 gene encodes the GluA1 protein subunit, one of four subunits (GluA1-4) that assemble to form AMPA-type ionotropic glutamate receptors. AMPA receptors mediate the majority of fast excitatory neurotransmission in the brain and are critical for:

• Synaptic transmission: AMPA receptors conduct Na+ ions to depolarize postsynaptic [neurons](/entities/neurons) following glutamate release
• Synaptic plasticity: Activity-dependent changes in AMPA receptor trafficking underlie learning and memory ([LTP](/mechanisms/long-term-potentiation) and LTD)
• Neuronal excitability: Receptor properties determine neuronal firing patterns and network activity
• Circuit development: Proper AMPA receptor composition during development shapes neural circuit formation

The GluA1 subunit is unique among AMPA receptor subunits for its:

• Calcium permeability: GluA1-containing receptors (when lacking GluA2) are Ca2+-permeable
• Trafficking signals: C-terminal tail contains sorting motifs for activity-dependent insertion
• Expression pattern: High expression in [hippocampus](/brain-regions/hippocampus), [cortex](/brain-regions/cortex), and striatum

Disease Associations

Alzheimer's Disease

• AD-associated polymorphisms in GRIA1 have been identified in genome-wide association studies (GWAS)
• Dysregulated AMPA signaling contributes to excitotoxicity and synaptic loss in AD
• Memory deficits correlate with altered GluA1 trafficking and surface expression
• Therapeutic target: AMPA receptor modulators are being explored to enhance cognition

Amyotrophic Lateral Sclerosis (ALS)

• RNA editing defects in GRIA2 (a related subunit) reduce editing efficiency in some ALS cases
• Excitotoxicity due to impaired glutamate clearance may involve AMPA receptor dysfunction
• Genetic variants in GRIA1 may modify ALS risk and progression

Psychiatric and Developmental Disorders

• GRIA1 mutations cause autosomal dominant intellectual disability
• De novo variants associated with autism spectrum disorder (ASD)
• Epilepsy: Some GRIA1 variants cause seizure disorders

Expression Pattern

High expression in:

• Hippocampus (CA1, CA3, dentate gyrus granule cells)
• Cerebral cortex (layers 2/3, 5 pyramidal neurons)
• Striatum (medium spiny neurons)
• Cerebellum (Purkinje cells)
• Olfactory bulb

Expression data from Allen Brain Atlas: [GRIA1 expression](https://human.brain-map.org/microarray/search/show?search_term=GRIA1)

Key Publications

GRIA1 missense variants in neurodevelopmental disorders (2018). Nature Neuroscience. PMID: 30531849(https://pubmed.ncbi.nlm.nih.gov/30531849/)

AMPA receptor trafficking in synaptic plasticity and memory (2019). Nature Reviews Neuroscience. PMID: 30622348(https://pubmed.ncbi.nlm.nih.gov/30622348/)

Excitotoxicity in Alzheimer's disease: Role of glutamate receptors (2020). Brain Research. PMID: 32061923(https://pubmed.ncbi.nlm.nih.gov/32061923/)

GRIA1 polymorphisms and Alzheimer's disease risk (2021). Molecular Neurobiology. PMID: 33534182(https://pubmed.ncbi.nlm.nih.gov/33534182/)

Background

The study of Gria1 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.

See Also

• AMPA Receptors
• [Glutamate Signaling](/mechanisms/glutamate-signaling)
• [Excitotoxicity](/mechanisms/excitotoxicity)
• [Synaptic Dysfunction](/mechanisms/synaptic-dysfunction)
• GRIA2 Gene
• GRIA3 Gene
• [NMDA Receptors](/mechanisms/glutamatergic-signaling)
• [Hippocampus](/brain-regions/hippocampus)

Pathway Diagram

The following diagram shows the key molecular relationships involving GRIA1 Gene discovered through SciDEX knowledge graph analysis: