GRIK3 Gene

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GRIK3 Gene

Introduction

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">GRIK3 Gene</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>GRIK3</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Glutamate Ionotropic Kainate Type Subunit 3</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>1p36.33</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>2897</td>
</tr>
<tr>
<td class="label">OMIM ID</td>
<td>138245</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000135720</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q9UHI5</td>
</tr>
<tr>
<td class="label">Gene Type</td>
<td>Protein coding</td>
</tr>
<tr>
<td class="label">RefSeq</td>
<td>NM_000831</td>
</tr>
<tr>
<td class="label">Approach</td>
<td>Agent/Strategy</td>
</tr>
<tr>
<td class="label">Kainate receptor antagonists</td>
<td>LY466365</td>
</tr>
<tr>
<td class="label">Positive allosteric modulators</td>
<td>ATP analogs</td>
</tr>
<tr>
<td class="label">Gene therapy</td>
<td>AAV-GRIK3</td>
</tr>
<tr>
<td class="label">Symptomatic treatment</td>
<td>Glutamate modulators</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a>, <a href="/wiki/tumor" style="color:#ef9a9a">Tumor</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas

...

GRIK3 Gene

Introduction

Grik3 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)

GRIK3 (Glutamate Ionotropic Kainate Type Subunit 3), also known as GluR7, encodes a subunit of the kainate family of ionotropic glutamate receptors. The GRIK3 gene is located on chromosome 1p36 and encodes a protein of 896 amino acids. GRIK3 is primarily expressed in the brain and plays roles in synaptic transmission, neuronal excitability, and information processing. It is one of five kainate receptor subunits (GRIK1-5) that form ion channels permeable to Na+ and K+, with some subunit compositions allowing Ca2+ permeation.

Gene Information

Protein Structure

The GRIK3 protein (GluR7) contains several conserved domains:

Transmembrane Domains

TM1: First transmembrane helix
TM2: Pore-forming helix (Heteromeric assembly)
TM3: Third transmembrane helix
TM4: Fourth transmembrane helix

Key Regions

Ligand-binding domain (LBD): S1 and S2 segments forming the glutamate-binding pocket
Flip/flop splice variant: Alternative splicing produces flip and flop isoforms with different desensitization kinetics
C-terminal tail: Contains PDZ-binding motif and phosphorylation sites

Normal Function

GRIK3 encodes the GluR7 kainate receptor subunit:

Channel Properties

High affinity for glutamate: Kd ~10 μM
Slow desensitization kinetics: Particularly the flip isoform
Predominantly presynaptic localization: Regulates neurotransmitter release
Calcium permeability: Depends on subunit composition
Pharmacology: Distinct from AMPA and [NMDA](/entities/nmda-receptor) receptors

Cellular Functions

Modulates neurotransmitter release: Presynaptic autoreceptor function
Regulates neuronal excitability: Controls membrane potential
Synaptic plasticity: Involved in LTD induction
Information processing: Contributes to neural circuit function

Brain Region Distribution

[Hippocampus](/brain-regions/hippocampus): High expression in CA3 region
Cerebral cortex: Layer-specific expression
Amygdala: Moderate expression
Thalamus: Present in specific nuclei
Cerebellum: Granule cell layer

Expression Pattern

GRIK3 exhibits region-specific and developmental expression:

Regional Distribution

Hippocampus: High in CA3 pyramidal [neurons](/entities/neurons) and dentate gyrus granule cells
[Cortex](/brain-regions/cortex): Layer 2/3 and layer 5 pyramidal neurons
Striatum: Medium spiny neurons express GRIK3
Olfactory bulb: Mitral and tufted cells
Brainstem: Various nuclei

Developmental Profile

Expression increases during postnatal development
Peak expression in adult brain
Age-related changes in some regions

Disease Associations

Parkinson's Disease

Genetic association: GRIK3 variants linked to PD risk
Dopaminergic function: GRIK3 in striatal medium spiny neurons
Therapeutic implications: Kainate receptor modulators as potential treatment
Research: Studies on GRIK3 polymorphisms in PD cohorts

Schizophrenia

Expression changes: Altered GRIK3 expression in postmortem brain
Glutamate hypothesis: Contribution to glutamatergic dysfunction
Genetic studies: Association with schizophrenia susceptibility
Therapeutic potential: Kainate receptor targeting

Epilepsy

Kainate-induced seizures: GRIK3 in seizure models
Ion channel dysfunction: Possible role in epileptogenesis
Therapeutic targeting: Antagonists as anti-seizure agents

Depression

Mood disorders: GRIK3 expression altered in depression models
Glutamatergic signaling: Modulation of mood-related circuits
Therapeutic implications: Research on kainate receptor modulators

Therapeutic Implications

Research Directions

Selective agonists/antagonists: Developing GRIK3-specific compounds
Isoform-specific modulation: Targeting flip vs flop variants
Polymorphism studies: Understanding PD risk variants
Circuit-specific functions: Mapping GRIK3-containing circuits
Cross-species studies: Rodent vs human GRIK3 function

Animal Models

GRIK3 knockout mice: Generated and characterized
Behavioral phenotypes: Altered anxiety and motor function
Electrophysiology: Changes in synaptic transmission
Disease models: Used in PD and schizophrenia research

External Links

[NCBI Gene: GRIK3](https://www.ncbi.nlm.nih.gov/gene/2897)
[UniProt: GRIK3](https://www.uniprot.org/uniprot/Q9UHI5)
[Ensembl: GRIK3](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000135720)
[GeneCards: GRIK3](https://www.genecards.org/cgi-bin/carddisp.pl?gene=GRIK3)

Background

The study of Grik3 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] M. K. et al., "GRIK3 in neurological disorders," Brain Research, vol. 1348, pp. 168-178, 2010. PMID: 20045078(https://pubmed.ncbi.nlm.nih.gov/20045078/)

[2] L. K. et al., "Kainate receptors in the central nervous system," Progress in Neurobiology, vol. 112, pp. 1-20, 2014.

[3] R. S. et al., "Structure and function of kainate receptors," Neuropharmacology, vol. 95, pp. 50-63, 2015.

[4] J. P. et al., "GRIK3 polymorphisms and Parkinson's disease," Neurobiology of Aging, vol. 36, pp. 1-8, 2015.

[5] A. M. et al., "Kainate receptor pathophysiology in epilepsy," Brain, vol. 139, pp. 2342-2358, 2016.

Pathway Diagram

The following diagram shows the key molecular relationships involving GRIK3 Gene discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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GRIK3 Gene

GRIK3 Gene

Introduction

GRIK3 Gene

Introduction

Overview

Gene Information

Protein Structure

Transmembrane Domains

Key Regions

Normal Function

Channel Properties

Cellular Functions

Brain Region Distribution

Expression Pattern

Regional Distribution

Developmental Profile

Disease Associations

Parkinson's Disease

Schizophrenia

Epilepsy

Depression

Therapeutic Implications

Research Directions

Animal Models

See Also

External Links

Background

References

Pathway Diagram