Genetic Variant GABRG2:c.*2287C>T (chr5-162155655-C-T) – ACMG Classification: Benign (-12 pts)

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_StrongBA1

The ENST00000639111.2(GABRG2):c.*2287C>T variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.429 in 152,006 control chromosomes in the GnomAD database, including 14,675 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: 𝑓 0.43 ( 14651 hom., cov: 31)

Exomes 𝑓: 0.33 ( 24 hom. )

Consequence

GABRG2
ENST00000639111.2 3_prime_UTR

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -0.258

Publications

2 publications found

Variant links:

Genes affected

GABRG2 (HGNC:4087): (gamma-aminobutyric acid type A receptor subunit gamma2) This gene encodes a gamma-aminobutyric acid (GABA) receptor. GABA is the major inhibitory neurotransmitter in the mammlian brain, where it acts at GABA-A receptors, which are ligand-gated chloride channels. GABA-A receptors are pentameric, consisting of proteins from several subunit classes: alpha, beta, gamma, delta and rho. Mutations in this gene have been associated with epilepsy and febrile seizures. Multiple transcript variants encoding different isoforms have been identified for this gene. [provided by RefSeq, Jul 2008]

GABRG2 Gene-Disease associations (from GenCC):

epilepsy
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
developmental and epileptic encephalopathy, 74
Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
febrile seizures, familial, 8
Inheritance: AD Classification: STRONG Submitted by: Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae)
Dravet syndrome
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
generalized epilepsy with febrile seizures plus
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
self-limited epilepsy with centrotemporal spikes
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
undetermined early-onset epileptic encephalopathy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

GABRG2 links:

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ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -12 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.99).

BA1

GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.568 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GABRG2	NM_198904.4 link	c.*2287C>T		downstream_gene_variant		ENST00000639213.2	NP_944494.1	P18507-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GABRG2	ENST00000639213.2 link	c.*2287C>T		downstream_gene_variant		1	NM_198904.4	ENSP00000491909.2		P18507-2

Frequencies

GnomAD3 genomes

AF:

0.429

AC:

64919

AN:

151464

Hom.:

14624

Cov.:

show subpopulations

Gnomad AFR

AF:

0.574

Gnomad AMI

AF:

0.513

Gnomad AMR

AF:

0.325

Gnomad ASJ

AF:

0.416

Gnomad EAS

AF:

0.491

Gnomad SAS

AF:

0.418

Gnomad FIN

AF:

0.353

Gnomad MID

AF:

0.389

Gnomad NFE

AF:

0.372

Gnomad OTH

AF:

0.392

GnomAD4 exome

AF:

0.335

AC:

142

AN:

424

Hom.:

Cov.:

AF XY:

0.339

AC XY:

AN XY:

254

show subpopulations

African (AFR)

AC:

AN:

American (AMR)

AF:

1.00

AC:

AN:

Ashkenazi Jewish (ASJ)

AC:

AN:

East Asian (EAS)

AC:

AN:

South Asian (SAS)

AF:

1.00

AC:

AN:

European-Finnish (FIN)

AF:

0.331

AC:

133

AN:

402

Middle Eastern (MID)

AC:

AN:

European-Non Finnish (NFE)

AF:

0.250

AC:

AN:

Other (OTH)

AF:

0.333

AC:

AN:

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.498

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.429

AC:

64995

AN:

151582

Hom.:

14651

Cov.:

AF XY:

0.428

AC XY:

31660

AN XY:

74032

show subpopulations

African (AFR)

AF:

0.574

AC:

23741

AN:

41356

American (AMR)

AF:

0.324

AC:

4917

AN:

15164

Ashkenazi Jewish (ASJ)

AF:

0.416

AC:

1444

AN:

3468

East Asian (EAS)

AF:

0.491

AC:

2503

AN:

5100

South Asian (SAS)

AF:

0.420

AC:

2018

AN:

4810

European-Finnish (FIN)

AF:

0.353

AC:

3710

AN:

10512

Middle Eastern (MID)

AF:

0.381

AC:

112

AN:

294

European-Non Finnish (NFE)

AF:

0.372

AC:

25264

AN:

67864

Other (OTH)

AF:

0.389

AC:

818

AN:

2102

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.503

Heterozygous variant carriers

1795

3590

5384

7179

8974

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

608

1216

1824

2432

3040

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.330

Hom.:

1645

Bravo

AF:

0.427

Asia WGS

AF:

0.423

AC:

1466

AN:

3468

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.99

CADD

Benign

0.94

(source)

DANN

Benign

0.45

PhyloP100

-0.26

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over