• Turnaround time:
    10–21 calendar days (14 days on average)
  • Preferred specimen:
    3mL whole blood in a purple-top tube
  • Alternate specimens:
    DNA or saliva/assisted saliva
  • Sample requirements
  • Request a sample kit




Associated disorders

The GABRG2 gene is associated with autosomal dominant childhood absence epilepsy (CAE) (MedGen UID: 334707), genetic epilepsy with febrile seizures plus (GEFS+), and familial febrile seizures (MedGen UID: 370755).

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Invitae tests that include this gene:

Pathogenic variants in the GABRG2 gene are a rare cause of clinical cases of generalized epilepsy with febrile seizures plus and idiopathic generalized epilepsy.

Ligand-gated chloride channels allow chloride ions to move across a membrane into the cell after binding to a ligand, blocking neuron firing (hyperpolarization). The GABRA1 gene encodes the gamma-2 subunit of the GABA-A ligand-gated chloride channel. The ligand for this receptor is the inhibitory neurotransmitter, gamma-aminobutyric acid (GABA) (PMID: 23038269).

Assay and technical information

Invitae is a College of American Pathologists (CAP)-accredited and Clinical Laboratory Improvement Amendments (CLIA)-certified clinical diagnostic laboratory performing full-gene sequencing and deletion/duplication analysis using next-generation sequencing technology (NGS).

Our sequence analysis covers clinically important regions of each gene, including coding exons, +/- 10 base pairs of adjacent intronic sequence in the transcript listed below. In addition, analysis covers the select non-coding variants specifically defined in the table below. Any variants that fall outside these regions are not analyzed. Any specific limitations in the analysis of these genes are also listed in the table below.

Our analysis detects most intragenic deletions and duplications at single exon resolution. However, in rare situations, single-exon copy number events may not be analyzed due to inherent sequence properties or isolated reduction in data quality. If you are requesting the detection of a specific single-exon copy number variation, please contact Client Services before placing your order.

Gene Transcript reference Sequencing analysis Deletion/Duplication analysis
GABRG2 NM_000816.3