Genetic Variant GABRA4:p.Ala364Thr (chr4-46965014-C-T) – ACMG Classification: Likely_benign (-6 pts)

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 0P and 6B. BP4_ModerateBS2

The NM_000809.4(GABRA4):c.1090G>A(p.Ala364Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000931 in 1,611,416 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000089 ( 0 hom. )

Consequence

GABRA4
NM_000809.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -0.224

Variant links:

Genes affected

GABRA4 (HGNC:4078): (gamma-aminobutyric acid type A receptor subunit alpha4) 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. At least 16 distinct subunits of GABA-A receptors have been identified. This gene encodes subunit alpha-4, which is involved in the etiology of autism and eventually increases autism risk through interaction with another subunit, gamma-aminobutyric acid receptor beta-1 (GABRB1). Alternatively spliced transcript variants encoding different isoforms have been found in this gene.[provided by RefSeq, Feb 2011]

GABRA4 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -6 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.09112501).

BS2

High AC in GnomAdExome4 at 13 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GABRA4	NM_000809.4 link	c.1090G>A	p.Ala364Thr	missense_variant	Exon 8 of 9	ENST00000264318.4	NP_000800.2	P48169X5D7F5
GABRA4	NM_001204266.2 link	c.1033G>A	p.Ala345Thr	missense_variant	Exon 8 of 9		NP_001191195.1	P48169
GABRA4	NM_001204267.2 link	c.880G>A	p.Ala294Thr	missense_variant	Exon 7 of 8		NP_001191196.1	P48169

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GABRA4	ENST00000264318.4 link	c.1090G>A	p.Ala364Thr	missense_variant	Exon 8 of 9	1	NM_000809.4	ENSP00000264318.3		P48169

Frequencies

GnomAD3 genomes

AF:

0.0000132

AC:

AN:

151736

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000242

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.00000891

AC:

AN:

1459680

Hom.:

Cov.:

AF XY:

0.00000689

AC XY:

AN XY:

726110

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:

0.0000108

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000132

AC:

AN:

151736

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74064

show subpopulations

Gnomad4 AFR

AF:

0.0000242

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jul 09, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.1090G>A (p.A364T) alteration is located in exon 8 (coding exon 8) of the GABRA4 gene. This alteration results from a G to A substitution at nucleotide position 1090, causing the alanine (A) at amino acid position 364 to be replaced by a threonine (T). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.069

BayesDel_addAF

Benign

-0.16

BayesDel_noAF

Benign

-0.46

CADD

Benign

7.0

DANN

Benign

0.59

DEOGEN2

Benign

0.14

Eigen

Benign

-1.0

Eigen_PC

Benign

-1.0

FATHMM_MKL

Benign

0.32

LIST_S2

Benign

0.72

M_CAP

Benign

0.047

MetaRNN

Benign

0.091

MetaSVM

Benign

-0.73

MutationAssessor

Benign

0.90

PrimateAI

Benign

0.26

PROVEAN

Benign

-0.61

REVEL

Benign

0.091

Sift

Benign

0.24

Sift4G

Benign

0.39

Polyphen

0.11

Vest4

0.039

MutPred

0.27

Gain of glycosylation at A364 (P = 0.0081);

MVP

0.64

MPC

0.055

ClinPred

0.075

GERP RS

2.1

Varity_R

0.025

gMVP

0.31

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