Gaba A Alpha 4 Protein — Gaba A Receptor Alpha 4 Subunit is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
{{Infobox protein
|name=GABRA4
|full_name=GABA-A Receptor Alpha 4 Subunit
|gene=GABRA4
|uniprot=P18505
|pdb=6HUP
|mw=58 kDa
|location=Cell membrane, synapse
|family=Cys-loop ligand-gated ion channel family
}}
GABRA4 is a subunit of the GABA-A receptor, a ligand-gated chloride channel that mediates inhibitory neurotransmission in the central nervous system. The alpha-4 subunit is encoded by the GABRA4 gene located on chromosome 4p12 and is predominantly expressed in the thalamus and cortex. GABA-A receptors containing the alpha-4 subunit have distinct pharmacological properties and are involved in regulating neuronal excitability, anxiety, and memory processes. These receptors are targets for benzodiazepines, neurosteroids, and various anxiolytic and anticonvulsant drugs.
GABRA4 contains:
GABRA4-containing GABA-A receptors mediate fast inhibitory neurotransmission:
GABRA4 is expressed in:
GABRA4 variants are associated with epilepsy:
The study of Gaba A Alpha 4 Protein — Gaba A Receptor Alpha 4 Subunit 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.
[1] Möhler et al. (2002) Nat Rev Neurosci 3:413-425
[2] Rudolph et al. (2001) Nature 401:796-800
Last updated: 2026-03-04
The GABA-A Alpha-4 subunit (GABRA4) is a component of the GABA-A receptor, a ligand-gated chloride channel that mediates fast inhibitory neurotransmission in the central nervous system. The Alpha-4 subunit is primarily expressed in the thalamus and dentate gyrus of the hippocampus, brain regions critical for sensory processing and memory formation.
GABA-A receptors containing the Alpha-4 subunit exhibit distinct pharmacological properties, including reduced sensitivity to benzodiazepines and distinctive patterns of modulation by neurosteroids. These receptors are often located extrasynaptically, where they respond to ambient GABA concentrations and mediate tonic inhibition.
Alzheimer's Disease: GABRA4 expression is altered in Alzheimer's disease, particularly in the hippocampus. Changes in Alpha-4 containing receptors may contribute to network hyperexcitability and seizure activity observed in some AD patients. The subunit may also be involved in hippocampal memory circuits.
Parkinson's Disease: GABA-A Alpha-4 receptors are implicated in basal ganglia circuitry and may influence motor control. Altered receptor expression could contribute to motor complications in PD, including dyskinesias.
Epilepsy: GABRA4 mutations have been linked to epilepsy syndromes, highlighting the importance of this subunit in controlling neuronal excitability. The subunit's role in thalamocortical circuits is particularly relevant for absence seizures.
Targeting GABA-A receptors containing the Alpha-4 subunit may provide therapeutic benefits for conditions involving network hyperexcitability. However, the subunit's distinct pharmacology makes it challenging to develop selective modulators.
Research focuses on understanding the specific roles of Alpha-4 containing receptors in brain circuits and developing subunit-selective modulators.