NM_198904.4(GABRG2):c.808A>G (p.Arg270Gly) AND not provided

Clinical significance:Uncertain significance (Last evaluated: Nov 18, 2014)

Review status:1 star out of maximum of 4 stars

criteria provided, single submitter

Based on:
1 submission [Details]
Record status:

Allele description [Variation Report for NM_198904.4(GABRG2):c.808A>G (p.Arg270Gly)]

NM_198904.4(GABRG2):c.808A>G (p.Arg270Gly)

GABRG2:gamma-aminobutyric acid type A receptor subunit gamma2 [Gene - OMIM - HGNC]
Variant type:
single nucleotide variant
Cytogenetic location:
Genomic location:
Preferred name:
NM_198904.4(GABRG2):c.808A>G (p.Arg270Gly)
Other names:
  • NC_000005.10:g.162142202A>G
  • NG_009290.1:g.79561A>G
  • NM_000816.3:c.808A>G
  • NM_000816.3:c.808A>G
  • NM_001375339.1:c.799A>G
  • NM_001375340.1:c.808A>G
  • NM_001375341.1:c.805A>G
  • NM_001375342.1:c.805A>G
  • NM_001375343.1:c.928A>G
  • NM_001375344.1:c.847A>G
  • NM_001375345.1:c.742A>G
  • NM_001375346.1:c.742A>G
  • NM_001375347.1:c.721A>G
  • NM_001375348.1:c.388A>G
  • NM_001375349.1:c.523A>G
  • NM_001375350.1:c.388A>G
  • NM_198903.2:c.928A>G
  • NM_198904.4:c.808A>GMANE SELECT
  • NP_000807.2:p.Arg270Gly
  • NP_000807.2:p.Arg270Gly
  • NP_001362268.1:p.Arg267Gly
  • NP_001362269.1:p.Arg270Gly
  • NP_001362270.1:p.Arg269Gly
  • NP_001362271.1:p.Arg269Gly
  • NP_001362272.1:p.Arg310Gly
  • NP_001362273.1:p.Arg283Gly
  • NP_001362274.1:p.Arg248Gly
  • NP_001362275.1:p.Arg248Gly
  • NP_001362276.1:p.Arg241Gly
  • NP_001362277.1:p.Arg130Gly
  • NP_001362278.1:p.Arg175Gly
  • NP_001362279.1:p.Arg130Gly
  • NP_944493.2:p.Arg310Gly
  • NP_944494.1:p.Arg270Gly
  • NC_000005.9:g.161569208A>G
Protein change:
dbSNP: rs796052520
NCBI 1000 Genomes Browser:
Molecular consequence:
  • NM_000816.3:c.808A>G - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001375339.1:c.799A>G - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001375340.1:c.808A>G - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001375341.1:c.805A>G - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001375342.1:c.805A>G - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001375343.1:c.928A>G - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001375344.1:c.847A>G - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001375345.1:c.742A>G - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001375346.1:c.742A>G - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001375347.1:c.721A>G - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001375348.1:c.388A>G - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001375349.1:c.523A>G - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001375350.1:c.388A>G - missense variant - [Sequence Ontology: SO:0001583]
  • NM_198903.2:c.928A>G - missense variant - [Sequence Ontology: SO:0001583]
  • NM_198904.4:c.808A>G - missense variant - [Sequence Ontology: SO:0001583]


MedGen: CN517202

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Assertion and evidence details

Submission AccessionSubmitterReview Status
(Assertion method)
Clinical Significance
(Last evaluated)
SCV000241140GeneDxcriteria provided, single submitter
Uncertain significance
(Nov 18, 2014)
germlineclinical testing

Citation Link

Summary from all submissions

EthnicityOriginAffectedIndividualsFamiliesChromosomes testedNumber TestedFamily historyMethod
not providedgermlineyesnot providednot providednot providednot providednot providedclinical testing

Details of each submission

From GeneDx, SCV000241140.10

#EthnicityIndividualsChromosomes TestedFamily HistoryMethodCitations
1not providednot providednot providednot providedclinical testingnot provided


p.Arg270Gly (AGA>GGA): c.808 A>G in exon 7 of the GABRG2 gene (NM_000816.3) The R270G variant has not been published as a mutation, nor has it been reported as a benign polymorphism to our knowledge. It was not observed in approximately 6,500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. The R270G variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. This substitution occurs at a position that is highly conserved across species, and in silico analysis predicts this variant is probably damaging to the protein structure/function. However, other missense mutations in nearby residues have not been reported. Therefore, based on the currently available information, it is unclear whether the R270G variant is a pathogenic mutation or a rare benign variant. The variant is found in EPILEPSY panel(s).

OriginAffectedNumber testedTissuePurposeMethodIndividualsAllele frequencyFamiliesCo-occurrences
1germlineyesnot providednot providednot providednot providednot providednot providednot provided

Last Updated: Oct 25, 2021

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