Gria4 Glutamate Receptor Ampa Type Subunit 4 is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
The ionotropic glutamate receptors are ligand-gated ion channels that mediate the majority of excitatory synaptic transmission in the central nervous system. Kainate receptors, named after their ability to be activated by the agonist kainic acid, represent a subclass of ionotropic glutamate receptors that play important roles in synaptic plasticity, neuronal excitability, and various neurological conditions.
This gene encodes a subunit of the kainate receptor family, which is differentially expressed throughout the brain and contributes to the complex regulation of glutamatergic signaling.
GRIA4 (Glutamate Ionotropic Receptor AMPA Type Subunit 4) encodes the glutamate receptor 4 (GluR4) subunit of the AMPA-type glutamate receptors. AMPA receptors mediate the majority of fast excitatory synaptic transmission in the brain.
| Attribute |
Value |
| Symbol |
GRIA4 |
| Full Name |
Glutamate Ionotropic Receptor AMPA Type Subunit 4 |
| Chromosomal Location |
11q22.1 |
| NCBI Gene ID |
2893 |
| Ensembl ID |
ENSG00000152578 |
| OMIM ID |
138246 |
| UniProt ID |
P35070 |
GRIA4 encodes the GluR4 protein (also called GluR-D or GluA4), an AMPA receptor subunit.
AMPA receptors (ionotropic glutamate receptors) are crucial for:
- Fast excitatory neurotransmission - Mediate rapid synaptic responses
- Synaptic plasticity - Essential for LTP and LTD
- Learning and memory - Critical for cognitive function
- Neuronal development - Important for synapse formation
The GluR4 subunit:
- Has high calcium permeability (when lacking GluR2)
- Shows rapid desensitization kinetics
- Is involved in activity-dependent synaptic plasticity
- Altered AMPA receptor expression in AD brains
- Aβ affects AMPA receptor trafficking and function
- Synaptic AMPA receptor loss correlates with cognitive decline
- AMPA receptor alterations in PD models
- Potential target for neuroprotection
- GRIA4 mutations cause epileptic encephalopathy
- Aberrant AMPA receptor trafficking in seizure disorders
- Rare variants in ASD patients
- Synaptic AMPA receptor dysfunction
- AMPA receptor overactivation causes excitotoxicity
- AMPA receptor antagonists are neuroprotective
GRIA4 is expressed predominantly in:
- Cerebellum (high expression)
- Hippocampus (CA3 region)
- Cerebral cortex (layer 2/3)
- Thalamus
- Perampanel - FDA-approved AMPA receptor antagonist for epilepsy
- Lacosamide - Modulates sodium channels, also affects AMPA
- Neuroprotection - AMPA receptor modulators for stroke
- Dingledine R, et al. (1999). 'The glutamate receptor ion channels.' Pharmacological Reviews. PMID:10049997
- Hollmann M, et al. (1991). 'Cloning by functional expression of a member of the glutamate receptor family.' Nature. PMID:1714535
- Burnashev N, et al. (1992). 'Calcium-permeable AMPA-kainate receptors in congenital olivopontocerebellar atrophy.' Brain Research. PMID:1331733
GRIA4 encodes the GluR4 subunit of AMPA receptors:
- Ion Permeability: Forms calcium-permeable AMPA receptors when lacking GluR2
- Kinetics: Exhibits slow desensitization kinetics compared to other subunits
- Conductance: High single-channel conductance properties
- Trafficking: Activity-dependent insertion into synapses
GluR4-containing receptors are critical for:
- Activity-dependent synaptic strengthening
- LTP induction in hippocampal neurons
- Experience-dependent plasticity in visual cortex
- Motor learning circuits
GRIA4 shows region-specific expression:
- Hippocampus: CA1 pyramidal neurons, dentate gyrus granule cells
- Cerebral Cortex: Layer 2/3 and layer 5 pyramidal neurons
- Cerebellum: Purkinje cells
- Thalamus: Relay neurons
- Basal Ganglia: Striatal medium spiny neurons
- Positive allosteric modulators (ampakines)
- AMPA receptor agonists/antagonists
- Subunit-selective compounds
- Cognitive enhancement
- Stroke recovery
- Alzheimer's disease treatment
- Depression and anxiety
The study of Gria4 Glutamate Receptor Ampa Type Subunit 4 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.
- Research on dopamine receptor function. Neuroscience Letters.
- Glutamate receptors in neurological disorders. Nature Reviews Neuroscience.