X-152168286-T-C

Position:

• chrX-152168286-T-C

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM2 PP3_Strong PP5_Moderate

The NM_000808.4(GABRA3):​c.1421A>G​(p.Tyr474Cys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency: Genomes: not found (cov: 23)
• Consequence: GABRA3 NM_000808.4 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 7.96

Genes affected

GABRA3 (HGNC:4077): (gamma-aminobutyric acid type A receptor subunit alpha3) 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. [provided by RefSeq, Jul 2008]

(HGNC:):

ACMG classification

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.984
• PP5: Variant X-152168286-T-C is Pathogenic according to our data. Variant chrX-152168286-T-C is described in ClinVar as [Pathogenic]. Clinvar id is 985441.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chrX-152168286-T-C is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GABRA3	NM_000808.4	c.1421A>G	p.Tyr474Cys	missense_variant	10/10	ENST00000370314.9	NP_000799.1
GABRA3	XM_006724811.4	c.*186A>G		3_prime_UTR_variant	9/9		XP_006724874.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GABRA3	ENST00000370314.9	c.1421A>G	p.Tyr474Cys	missense_variant	10/10	1	NM_000808.4	ENSP00000359337	P1
GABRA3	ENST00000535043.1	c.1421A>G	p.Tyr474Cys	missense_variant	10/10	1		ENSP00000443527	P1
	ENST00000453915.1	n.501+3698T>C		intron_variant, non_coding_transcript_variant		5

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 23

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Sep 17, 2018

- -

Epilepsy, X-linked 2, with or without impaired intellectual development and dysmorphic features Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Nov 22, 2022

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.57	D
BayesDel_noAF	Pathogenic	0.59
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.91	D;D
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Uncertain	0.95	.;D
M_CAP	Pathogenic	0.76	D
MetaRNN	Pathogenic	0.98	D;D
MetaSVM	Pathogenic	0.80	D
MutationAssessor	Pathogenic	3.0	M;M
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Pathogenic	0.91	D
PROVEAN	Pathogenic	-7.8	D;D
REVEL	Pathogenic	0.95
Sift	Pathogenic	0.0	D;D
Sift4G	Pathogenic	0.0	D;D
Polyphen		1.0	D;D
Vest4		0.95
MutPred		0.86		Gain of catalytic residue at W475 (P = 0.032);Gain of catalytic residue at W475 (P = 0.032);
MVP		0.98
MPC		1.3
ClinPred		1.0	D
GERP RS		4.8
Varity_R		0.93
gMVP		0.94

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

Other links and lift over

dbSNP: rs1936960785; hg19: chrX-151336758;