rs1312439667

Positions:

chr5-161897402-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM2PP2BP4_Moderate

The NM_001127644.2(GABRA1):c.1351G>A(p.Ala451Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,724 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

GABRA1
NM_001127644.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 7.56

Variant links:

Genes affected

GABRA1 (HGNC:4075): (gamma-aminobutyric acid type A receptor subunit alpha1) This gene encodes a gamma-aminobutyric acid (GABA) receptor. 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. GABA-A receptors are pentameric, consisting of proteins from several subunit classes: alpha, beta, gamma, delta and rho. Mutations in this gene cause juvenile myoclonic epilepsy and childhood absence epilepsy type 4. Multiple transcript variants encoding the same protein have been identified for this gene. [provided by RefSeq, Jul 2008]

GABRA1 links:

GABRA1 (HGNC:):

GABRA1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP2

Missense variant in gene, where missense usually causes diseases (based on misZ statistic), GABRA1. . Gene score misZ 3.1498 (greater than the threshold 3.09). Trascript score misZ 4.2662 (greater than threshold 3.09). GenCC has associacion of gene with juvenile myoclonic epilepsy, developmental and epileptic encephalopathy, 19, epilepsy, idiopathic generalized, susceptibility to, 13, Dravet syndrome, developmental and epileptic encephalopathy.

BP4

Computational evidence support a benign effect (MetaRNN=0.21481463).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GABRA1	NM_001127644.2 linkuse as main transcript	c.1351G>A	p.Ala451Thr	missense_variant	10/10	ENST00000393943.10	NP_001121116.1	P14867

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GABRA1	ENST00000393943.10 linkuse as main transcript	c.1351G>A	p.Ala451Thr	missense_variant	10/10	1	NM_001127644.2	ENSP00000377517.4		P14867

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000398

AC:

AN:

251000

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135726

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:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000881

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461724

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

727178

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:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

8.99e-7

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

Alfa

AF:

0.0000468

Hom.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Idiopathic generalized epilepsy;C1970160:Epilepsy, childhood absence 4;C4013473:Epilepsy, idiopathic generalized, susceptibility to, 13

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

May 08, 2019

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. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant has not been reported in the literature in individuals with GABRA1-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change replaces alanine with threonine at codon 451 of the GABRA1 protein (p.Ala451Thr). The alanine residue is moderately conserved and there is a small physicochemical difference between alanine and threonine. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.068

BayesDel_addAF

Benign

-0.023

BayesDel_noAF

Benign

-0.27

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Benign

0.25

T;T;T;T;T;T;.;T;T

Eigen

Benign

0.052

Eigen_PC

Benign

0.21

FATHMM_MKL

Uncertain

0.95

LIST_S2

Uncertain

0.92

.;.;.;.;.;.;D;.;D

M_CAP

Uncertain

0.13

MetaRNN

Benign

0.21

T;T;T;T;T;T;T;T;T

MetaSVM

Benign

-0.34

MutationAssessor

Benign

0.69

N;N;N;N;N;N;.;N;N

PrimateAI

Benign

0.46

PROVEAN

Benign

-0.62

.;N;N;N;N;.;.;.;.

REVEL

Uncertain

0.33

Sift

Uncertain

0.021

.;D;D;D;D;.;.;.;.

Sift4G

Benign

0.062

.;T;T;T;T;.;.;.;.

Polyphen

0.22

B;B;B;B;B;B;.;B;B

Vest4

0.14, 0.12, 0.13, 0.13

MutPred

0.14

Gain of glycosylation at A451 (P = 0.0051);Gain of glycosylation at A451 (P = 0.0051);Gain of glycosylation at A451 (P = 0.0051);Gain of glycosylation at A451 (P = 0.0051);Gain of glycosylation at A451 (P = 0.0051);Gain of glycosylation at A451 (P = 0.0051);.;Gain of glycosylation at A451 (P = 0.0051);Gain of glycosylation at A451 (P = 0.0051);

MVP

0.53

MPC

0.37

ClinPred

0.84

GERP RS

4.6

Varity_R

0.15

gMVP

0.50

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