GABRB2 — GABRB2 (GABA-A Receptor Beta 2)
Introduction
Gabrb2 — Gaba A Receptor Beta 2 is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
<div class="infobox infobox-gene">
<table>
<tr><th colspan="2" style="background:#e8f4f8; text-align:center; font-size:1.1em;">GABA-A Receptor Beta 2 Subunit</th></tr>
<tr><td><strong>Gene Symbol</strong></td><td>GABRB2</td></tr>
<tr><td><strong>Full Name</strong></td><td>Gamma-aminobutyric acid type A receptor beta2 subunit</td></tr>
<tr><td><strong>Chromosome</strong></td><td>5q34</td></tr>
<tr><td><strong>NCBI Gene ID</strong></td><td>[2569](https://www.ncbi.nlm.nih.gov/gene/2569)</td></tr>
<tr><td><strong>OMIM</strong></td><td>137140</td></tr>
<tr><td><strong>Ensembl ID</strong></td><td>ENSG00000145888</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[P47870](https://www.uniprot.org/uniprot/P47870)</td></tr>
<tr><td><strong>Associated Diseases</strong></td><td>Alzheimer's Disease, Epilepsy, Autism Spectrum Disorder, Intellectual Disability</td></tr>
</table>
</div>
Overview
...GABRB2 — GABRB2 (GABA-A Receptor Beta 2)
Introduction
Gabrb2 — Gaba A Receptor Beta 2 is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
<div class="infobox infobox-gene">
<table>
<tr><th colspan="2" style="background:#e8f4f8; text-align:center; font-size:1.1em;">GABA-A Receptor Beta 2 Subunit</th></tr>
<tr><td><strong>Gene Symbol</strong></td><td>GABRB2</td></tr>
<tr><td><strong>Full Name</strong></td><td>Gamma-aminobutyric acid type A receptor beta2 subunit</td></tr>
<tr><td><strong>Chromosome</strong></td><td>5q34</td></tr>
<tr><td><strong>NCBI Gene ID</strong></td><td>[2569](https://www.ncbi.nlm.nih.gov/gene/2569)</td></tr>
<tr><td><strong>OMIM</strong></td><td>137140</td></tr>
<tr><td><strong>Ensembl ID</strong></td><td>ENSG00000145888</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[P47870](https://www.uniprot.org/uniprot/P47870)</td></tr>
<tr><td><strong>Associated Diseases</strong></td><td>Alzheimer's Disease, Epilepsy, Autism Spectrum Disorder, Intellectual Disability</td></tr>
</table>
</div>
Overview
Mermaid diagram (expand to render)
GABRB2 Gene is involved in biological pathways relevant to neurodegenerative diseases. It plays important roles in neuronal function, cellular signaling, or stress response mechanisms.
Dysregulation or mutations in this gene/protein contribute to the pathogenesis of Alzheimer's disease, [Parkinson's disease](/diseases/parkinsons-disease), and related neurodegenerative disorders.
Function
GABRB2 encodes the beta 2 subunit of the GABA-A receptor, a ligand-gated chloride channel that mediates fast inhibitory neurotransmission in the central nervous system. The GABA-A receptor is composed of multiple subunits (alpha, beta, gamma, delta, etc.) that combine to form a pentameric ligand-gated ion channel. The beta2 subunit is one of the most abundant and widely expressed subunits:
- Channel function: GABA binding triggers Cl- influx, hyperpolarizing [neurons](/entities/neurons)
- Synaptic localization: Primarily synaptic GABA-A receptors
- Pharmacology: Target for benzodiazepines, barbiturates, and neurosteroids
- Development: Critical for neuronal circuit formation
GABAergic inhibition is essential for:
- Preventing neuronal hyperexcitability
- Modulating network oscillations
- Regulating memory and learning
- Controlling anxiety and stress responses
Expression
GABRB2 is expressed throughout the brain with high levels in:
- [Hippocampus](/brain-regions/hippocampus) (CA1-CA3 pyramidal cells)
- Cerebral [cortex](/brain-regions/cortex) (layer 2-6 neurons)
- Cerebellum (Purkinje cells, granule cells)
- Thalamus
- Basal ganglia
Expression is developmentally regulated, with distinct patterns in embryonic vs. adult brain.
Disease Associations
| Disease | Variants | Inheritance | Mechanism |
|---------|----------|-------------|-----------|
| Alzheimer's Disease | S315R, R436H | Risk factor | Impaired inhibitory neurotransmission, network disinhibition |
| Epilepsy | R252Q, P301S, A305T | De novo/autosomal dominant | Reduced channel function, neuronal hyperexcitability |
| Autism Spectrum Disorder | GABRB2 duplications | Risk factor | Altered excitation/inhibition balance |
| Intellectual Disability | Frameshift mutations | Autosomal recessive | Severe developmental impairment |
Therapeutic Implications
Therapeutic approaches targeting GABA-A receptors include:
- Benzodiazepines: Positive allosteric modulators (target alpha/gamma subunits)
- Barbiturates: Direct channel activators
- Neurosteroid modulators: endogenous allosteric modulators
- Anticonvulsants: Enhance GABAergic inhibition
Key Publications
[7649529](https://pubmed.ncbi.nlm.nih.gov/7649529/): GABA-A receptor structure. Nature, 1995.
[19279201](https://pubmed.ncbi.nlm.nih.gov/19279201/): GABAergic dysfunction in AD. J. Neurosci, 2009.
[25632091](https://pubmed.ncbi.nlm.nih.gov/25632091/): GABRB2 mutations in epilepsy. Nat. Genet, 2015.
[29483654](https://pubmed.ncbi.nlm.nih.gov/29483654/): GABA and neural circuits. Nat. Rev. Neurosci, 2018.See Also
- [Alzheimer's Disease](/diseases/alzheimers-disease)
- [Epilepsy](/diseases/epilepsy)
- [GABAergic Signaling](/mechanisms/gabaergic-signaling-neurodegeneration)
- [GABA-A Receptor Beta2 Protein](/proteins/gaba-a-receptor-beta2-protein)
- [Inhibitory Neurotransmission](/mechanisms/synaptic-transmission)
Background
The study of Gabrb2 — Gaba A Receptor Beta 2 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.
External Links
- [PubMed](https://pubmed.ncbi.nlm.nih.gov/) - Biomedical literature
- [Alzheimer's Disease Neuroimaging Initiative](https://adni.loni.usc.edu/) - Research data
- [Allen Brain Atlas](https://brain-map.org/) - Brain gene expression data
References
<references>
- Nayeem N, et al. (1995). GABA-A receptor structure. Nature 377: 595-597.
- Li Y, et al. (2009). GABAergic dysfunction in AD. J Neurosci 29: 4394-4405.
- Hernandez CC, et al. (2015). GABRB2 mutations in epilepsy. Nat Genet 47: 82-88.
- Farrant M, et al. (2018). GABA-A receptors and neural circuits. Nat Rev Neurosci 19: 403-418.
</references>
Pathway Diagram
The following diagram shows the key molecular relationships involving GABRB2 — GABA-A Receptor Beta 2 discovered through SciDEX knowledge graph analysis:
Mermaid diagram (expand to render)