1-2019430-G-T

Position:

chr1-2019430-G-T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_000815.5(GABRD):c.7G>T(p.Ala3Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000127 in 1,090,338 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.00012 ( 0 hom., cov: 26)

Exomes 𝑓: 0.00013 ( 0 hom. )

Consequence

GABRD
NM_000815.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 0.361

Variant links:

Genes affected

GABRD (HGNC:4084): (gamma-aminobutyric acid type A receptor subunit delta) Gamma-aminobutyric acid (GABA) is the major inhibitory neurotransmitter in the mammalian brain where it acts at GABA-A receptors, which are ligand-gated chloride channels. Chloride conductance of these channels can be modulated by agents such as benzodiazepines that bind to the GABA-A receptor. The GABA-A receptor is generally pentameric and there are five types of subunits: alpha, beta, gamma, delta, and rho. This gene encodes the delta subunit. Mutations in this gene have been associated with susceptibility to generalized epilepsy with febrile seizures, type 5. Alternatively spliced transcript variants have been described for this gene, but their biological validity has not been determined. [provided by RefSeq, Jul 2008]

GABRD links:

GABRD (HGNC:):

GABRD links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.005064428).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GABRD	NM_000815.5 linkuse as main transcript	c.7G>T	p.Ala3Ser	missense_variant	1/9	ENST00000378585.7	NP_000806.2	O14764A8K496

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GABRD	ENST00000378585.7 linkuse as main transcript	c.7G>T	p.Ala3Ser	missense_variant	1/9	1	NM_000815.5	ENSP00000367848.4		O14764

Frequencies

GnomAD3 genomes

AF:

0.000116

AC:

AN:

147062

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000246

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00231

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00327

Gnomad NFE

AF:

0.0000605

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000957

AC:

AN:

3134

Hom.:

AF XY:

0.00101

AC XY:

AN XY:

1982

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00394

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000129

AC:

122

AN:

943180

Hom.:

Cov.:

AF XY:

0.000146

AC XY:

AN XY:

445868

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00238

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000708

Gnomad4 OTH exome

AF:

0.000296

GnomAD4 genome

AF:

0.000116

AC:

AN:

147158

Hom.:

Cov.:

AF XY:

0.000195

AC XY:

AN XY:

71736

show subpopulations

Gnomad4 AFR

AF:

0.0000246

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00232

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000605

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000712

Hom.:

Bravo

AF:

0.0000604

ExAC

AF:

0.00112

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Oct 06, 2022

The c.7G>T (p.A3S) alteration is located in exon 1 (coding exon 1) of the GABRD gene. This alteration results from a G to T substitution at nucleotide position 7, causing the alanine (A) at amino acid position 3 to be replaced by a serine (S). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Idiopathic generalized epilepsy

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Nov 19, 2023

This sequence change replaces alanine, which is neutral and non-polar, with serine, which is neutral and polar, at codon 3 of the GABRD protein (p.Ala3Ser). This variant is present in population databases (rs759523853, gnomAD 0.4%). This variant has not been reported in the literature in individuals affected with GABRD-related conditions. ClinVar contains an entry for this variant (Variation ID: 641126). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Not Available"; PolyPhen-2: "Not Available"; Align-GVGD: "Not Available". The serine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.083

BayesDel_addAF

Benign

-0.43

BayesDel_noAF

Benign

-0.40

CADD

Benign

8.8

DANN

Benign

0.81

DEOGEN2

Benign

0.097

T;.;.;.;.

Eigen

Benign

-1.1

Eigen_PC

Benign

-1.1

FATHMM_MKL

Benign

0.0016

LIST_S2

Benign

0.31

T;T;T;T;T

MetaRNN

Benign

0.0051

T;T;T;T;T

MetaSVM

Benign

-0.93

MutationAssessor

Benign

0.55

N;.;.;.;.

MutationTaster

Benign

1.0

PrimateAI

Pathogenic

0.81

PROVEAN

Benign

0.26

N;.;.;.;.

REVEL

Benign

0.11

Sift

Benign

0.42

T;.;.;.;.

Sift4G

Benign

0.86

T;.;.;.;.

Polyphen

0.0070

B;.;.;.;.

Vest4

0.15

MutPred

0.26

Gain of phosphorylation at A3 (P = 0.0166);Gain of phosphorylation at A3 (P = 0.0166);Gain of phosphorylation at A3 (P = 0.0166);Gain of phosphorylation at A3 (P = 0.0166);Gain of phosphorylation at A3 (P = 0.0166);

MVP

0.51

MPC

0.69

ClinPred

0.017

GERP RS

0.34

Varity_R

0.11

gMVP

0.41

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

Details are displayed if max score is > 0.2

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over