GABRG2 rs35576928: Understanding Your Genetic Variant
The rs35576928 variant is a genetic change located within the GABRG2 gene, which provides instructions for building a critical component of the brain's inhibitory signaling system. This variant is studied for its potential role in altering GABA-A receptor function, a mechanism often linked to various inherited epilepsy syndromes.
What each genotype means
Typical GABRG2 function
This genotype represents the most common version of the GABRG2 gene found in the general population. It is associated with standard GABA-A receptor subunit production, which is essential for normal inhibitory neurotransmission in the brain.
This is the most frequent genotype observed across all major global populations.
Common genetic variation
This genotype indicates the presence of one copy of the variant allele. While GABRG2 is a known epilepsy-associated gene, this specific common variant is generally considered a normal part of human genetic diversity rather than a primary cause of clinical epilepsy syndromes.
This genotype is found at varying frequencies depending on ancestry, typically present in a significant portion of the population.
Common genetic variation
This genotype indicates the presence of two copies of the variant allele. Current research does not classify this common variant as a pathogenic mutation for epilepsy, though GABRG2 as a gene is critical for neurological health and is linked to various seizure disorders when rare, disruptive mutations occur.
This genotype is less common than the CC or CT configurations but is still observed frequently in population databases.
What is rs35576928 and Where is it Located?
The rs35576928 variant is a single nucleotide polymorphism (SNP) situated within the GABRG2 gene. This gene is located on chromosome 5 at position 5q34. In the context of human genetics, a SNP represents a variation at a single position in the DNA sequence among individuals. The GABRG2 gene is part of a cluster of genes that encode subunits for the GABA-A receptor, which is the primary inhibitory ion channel in the mammalian central nervous system. Because this gene is essential for regulating the excitability of neurons, researchers closely monitor variations in this region to understand how they might influence the structural integrity or the functional efficiency of these critical brain receptors.
The Role of the GABRG2 Gene
The GABRG2 gene encodes the gamma-2 subunit of the GABA-A receptor. GABA is the major inhibitory neurotransmitter in the brain, meaning it helps calm neuronal activity and maintain a balance between excitation and inhibition. The GABA-A receptor is a complex, multi-subunit protein that acts as a chloride channel. When GABA binds to this receptor, the channel opens, allowing chloride ions to flow into the neuron, which makes the cell less likely to fire an electrical signal. The gamma-2 subunit is particularly important because it is required for the proper trafficking of these receptors to the cell surface and for the receptor's sensitivity to certain medications, such as benzodiazepines. Dysfunction in this subunit can disrupt the brain's ability to dampen excessive electrical activity.
Research Associations and Evidence Strength
Research into GABRG2 has established that mutations in this gene are associated with a spectrum of epilepsy syndromes, including genetic epilepsy with febrile seizures plus (GEFS+) and more severe developmental and epileptic encephalopathies. While specific pathogenic mutations are well-documented in clinical literature, the evidence strength for common variants like rs35576928 is often categorized as moderate. Statistical associations observed in large-scale genomic studies suggest that variations in this gene may influence susceptibility to seizure disorders, but these associations do not imply a direct cause-and-effect relationship for every individual. It is important to note that epilepsy is a complex, polygenic condition, meaning it is influenced by many genetic and environmental factors working in concert, rather than a single variant alone.
Population Frequency
The rs35576928 variant is considered a common variant across various human populations. In genomics, a common variant is typically defined as one that appears in more than 1% of the population. Because it is common, many healthy individuals carry this variant without ever experiencing epilepsy or other neurological conditions. Its presence in the general population highlights that genetic variation is a normal part of human diversity. When researchers study such variants, they look for subtle differences in frequency between groups with specific health conditions and control groups to determine if the variant contributes to a higher risk, though for common variants, the individual risk contribution is usually very small.
What You Can and Cannot Do With This Information
Understanding your genetic profile can be an educational experience, but it is not a substitute for professional medical advice. You cannot use the presence of the rs35576928 variant to diagnose yourself with epilepsy or any other condition. Genetic associations are statistical in nature and do not predict individual health outcomes. If you have concerns about your neurological health or a family history of seizures, the most appropriate step is to consult with a neurologist or a genetic counselor. They can interpret your results in the context of your personal and family medical history. Never make changes to your medications or health regimen based on genetic data without first discussing these findings with your clinician or pharmacist.
How common is this variant?
The rs35576928 variant is a common polymorphism found across diverse ancestral populations, with its specific genotype frequencies varying slightly by geographic region.
Frequently asked questions
Does having the rs35576928 variant mean I will develop epilepsy?
No. Having this variant does not mean you will develop epilepsy. Epilepsy is a complex condition influenced by many genetic and environmental factors, and many people carry this common variant without any health issues.
Is GABRG2 related to medication response?
The GABRG2 gene is involved in the function of GABA-A receptors, which are targets for certain medications like benzodiazepines. If you have questions about how your genetics might influence your response to specific drugs, please consult your pharmacist or doctor.
Where can I find more information about GABRG2?
You can find reliable information about genes and their functions through resources like MedlinePlus Genetics or the NCBI Gene database. These sites provide comprehensive, peer-reviewed summaries of human genes.
Should I get tested for this variant?
Genetic testing for specific variants is generally only recommended by healthcare providers if there is a clear clinical reason, such as a personal or family history of a specific condition. You should discuss the necessity of any genetic testing with a qualified medical professional.
Sources & further reading
Educational information only, last refreshed 9/20/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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This variant in the GABRG2 gene is associated with variations in response to certain anticonvulsant medications and epilepsy susceptibility.
This variant is located in the GABRG2 gene, which encodes the gamma-2 subunit of the GABA-A receptor; variants in this gene are associated with a spectrum of epilepsy syndromes.
A common variant in GABRG2, a gene encoding a GABA-A receptor subunit linked to various epilepsy phenotypes including febrile seizures and GEFS+.
Variant in GABRG2, a gene where mutations can alter GABA-A receptor function and influence seizure thresholds.
Mutations in GABRG2 are linked to a spectrum of epilepsy ranging from simple febrile seizures to severe developmental and epileptic encephalopathies.
This variant is associated with susceptibility to childhood absence epilepsy and febrile seizures.