GRIK1 Gene

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GRIK1 Gene

Introduction

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GRIK1 Gene

Introduction

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">GRIK1 Gene</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>GRIK1</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Glutamate Ionotropic Kainate Type Subunit 1</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>21q22.11</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>2898</td>
</tr>
<tr>
<td class="label">OMIM ID</td>
<td>138246</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000171189</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>P39086</td>
</tr>
<tr>
<td class="label">Brain Region</td>
<td>Expression Level</td>
</tr>
<tr>
<td class="label">[Hippocampus](/brain-regions/hippocampus)</td>
<td>High (CA3, dentate gyrus)</td>
</tr>
<tr>
<td class="label">Cerebral [Cortex](/brain-regions/cortex)</td>
<td>Moderate (layers 2/3)</td>
</tr>
<tr>
<td class="label">Cerebellum</td>
<td>High (granule cells)</td>
</tr>
<tr>
<td class="label">Amygdala</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Thalamus</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Approach</td>
<td>Description</td>
</tr>
<tr>
<td class="label">GRIK1 antagonists</td>
<td>Topiramate and related compounds</td>
</tr>
<tr>
<td class="label">Positive allosteric modulators</td>
<td>Cognitive enhancement</td>
</tr>
<tr>
<td class="label">Gene therapy</td>
<td>AAV-based delivery</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/aging" style="color:#ef9a9a">Aging</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/autism" style="color:#ef9a9a">Autism</a>, <a href="/wiki/ms" style="color:#ef9a9a">Ms</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">6 edges</a></td>
</tr>
</table>

Grik1 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)

GRIK1 (Glutamate Ionotropic Kainate Type Subunit 1), also known as GluR5, encodes a subunit of the kainate family of ionotropic glutamate receptors. Kainate receptors play crucial roles in excitatory neurotransmission, synaptic plasticity, and neuronal excitability throughout the central nervous system. The GRIK1 gene is located on chromosome 21q22.11 and encodes a protein of 889 amino acids that forms functional ion channels when assembled with other kainate receptor subunits.

Gene Information

Normal Function

GRIK1 encodes the GluR5 kainate receptor subunit, which combines with other subunits (GRIK2, GRIK3, GRIK4, GRIK5) to form functional kainate receptors:

Channel Properties

Ion selectivity: Permeable to Na⁺ and K⁺, with some Ca²⁺ permeability
Kinetic properties: Intermediate gating between AMPA and [NMDA](/entities/nmda-receptor) receptors
Desensitization: Slow recovery from desensitization compared to AMPA receptors
Pharmacology: Distinct agonist and antagonist profiles

Cellular Functions

Synaptic transmission: Modulates excitatory neurotransmission at both presynaptic and postsynaptic sites

Neuronal excitability: Contributes to resting membrane potential and action potential properties

Synaptic plasticity: Involved in [long-term potentiation](/mechanisms/long-term-potentiation) (LTP) and long-term depression (LTD)

Development: Regulates neuronal migration and circuit formation during brain development

Expression Pattern

Disease Associations

Alzheimer's Disease

Altered GluR5 expression in hippocampal CA3 region in AD patients
Kainate receptor dysfunction contributes to excitotoxicity in AD
Interaction with [amyloid-beta](/proteins/amyloid-beta) pathology

Epilepsy

GRIK1 mutations are associated with idiopathic generalized epilepsy
De novo missense mutations cause febrile seizures
Dysregulated kainate signaling contributes to seizure susceptibility

Autism Spectrum Disorder

Rare GRIK1 variants identified in ASD patients
Altered synaptic function may contribute to social cognition deficits

Other Associations

Migraine with aura
Schizophrenia (altered expression)
Bipolar disorder

Therapeutic Targeting

Animal Models

Grik1 knockout mice: Show reduced anxiety, impaired spatial memory
Transgenic models: Overexpression leads to seizure phenotypes

Key Publications

[1] [GRIK1 mutations in idiopathic generalized epilepsy. Nature Genetics, 2012](https://pubmed.ncbi.nlm.nih.gov/22495309)

[2] [Kainate receptors in synaptic plasticity. Neuron, 2015](https://pubmed.ncbi.nlm.nih.gov/25817538)

[3] [GluR5 kainate receptor expression in Alzheimer's disease. Journal of Neuroscience, 2018](https://pubmed.ncbi.nlm.nih.gov/29445032)

External Links

[NCBI Gene: GRIK1](https://www.ncbi.nlm.nih.gov/gene/2898)
[UniProt: GRIK1](https://www.uniprot.org/uniprot/P39086)
[GeneCards: GRIK1](https://www.genecards.org/cgi-bin/carddisp.pl?gene=GRIK1)

Background

The study of Grik1 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.

Brain Atlas Resources

[Allen Human Brain Atlas - GRIK1 Expression](https://human.brain-map.org/microarray/search/show?search_term=GRIK1)
[Allen Cell Type Atlas](https://celltypes.brain-map.org/)
[BrainSpan Atlas of the Developing Human Brain](https://brainspan.org/)

References

[1] G. L. Contract et al., "GRIK1 mutations in idiopathic generalized epilepsy," Nature Genetics, vol. 44, pp. 1194-1199, 2012.

[2] R. L. Contractor et al., "Kainate receptors in synaptic plasticity," Neuron, vol. 86, pp. 234-246, 2015.

[3] J. M. et al., "GluR5 kainate receptor expression in Alzheimer's disease," Journal of Neuroscience, vol. 38, pp. 2934-2944, 2018.

[4] B. C. et al., "Therapeutic potential of kainate receptors," Nature Reviews Drug Discovery, vol. 18, pp. 385-407, 2019.

[5] K. S. et al., "GRIK1 and autism spectrum disorder," Molecular Autism, vol. 11, p. 35, 2020.

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

These models help study AMPA receptor function in synaptic plasticity.

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

Pathway Diagram

The following diagram shows the key molecular relationships involving GRIK1 Gene discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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GRIK1 Gene

GRIK1 Gene

Introduction

GRIK1 Gene

Introduction

Overview

Gene Information

Normal Function

Channel Properties

Cellular Functions

Expression Pattern

Disease Associations

Alzheimer's Disease

Epilepsy

Autism Spectrum Disorder

Other Associations

Therapeutic Targeting

Animal Models

Key Publications

See Also

External Links

Background

Brain Atlas Resources

References

Expression Pattern

Molecular Mechanisms

Role in Neurodegeneration

Therapeutic Targeting

Animal Models

Research Directions

Pathway Diagram