NM_000808.4:c.830A>G

Variant names:

• chrX-152197734-T-C
• NM_000808.4:c.830A>G

Variant summary

Our verdict is Likely pathogenic. The variant received 8 ACMG points: 8P and 0B. PM2 PP3_Strong PP5_Moderate

The NM_000808.4(GABRA3):​c.830A>G​(p.Tyr277Cys) 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. 12/21 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency: Genomes: not found (cov: 23)
• Consequence: GABRA3 NM_000808.4 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 7.97
• Publications: 0 publications found

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]

GABRA3 Gene-Disease associations (from GenCC):

• epilepsy, X-linked 2, with or without impaired intellectual development and dysmorphic features

  Inheritance: XL Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Illumina

ACMG classification

Our verdict: Likely_pathogenic. The variant received 8 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.954
• PP5: Variant X-152197734-T-C is Pathogenic according to our data. Variant chrX-152197734-T-C is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 2576557.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000808.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GABRA3	NM_000808.4	MANE Select	c.830A>G	p.Tyr277Cys	missense	Exon 8 of 10	NP_000799.1	P34903

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GABRA3	ENST00000370314.9	TSL:1 MANE Select	c.830A>G	p.Tyr277Cys	missense	Exon 8 of 10	ENSP00000359337.4	P34903
	GABRA3	ENST00000535043.1	TSL:1	c.830A>G	p.Tyr277Cys	missense	Exon 8 of 10	ENSP00000443527.1	P34903
	GABRA3	ENST00000862742.1		c.830A>G	p.Tyr277Cys	missense	Exon 9 of 11	ENSP00000532801.1

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 28

GnomAD4 genome Cov.: 23

ClinVar

ClinVar submissions

Significance: Likely pathogenic

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
1	-	-	Epilepsy, X-linked 2, with or without impaired intellectual development and dysmorphic features (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.57	D
BayesDel_noAF	Pathogenic	0.58
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.90	D
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Pathogenic	0.99	D
M_CAP	Pathogenic	0.75	D
MetaRNN	Pathogenic	0.95	D
MetaSVM	Pathogenic	0.91	D
MutationAssessor	Pathogenic	3.4	M
PhyloP100		8.0
PrimateAI	Pathogenic	0.92	D
PROVEAN	Pathogenic	-7.7	D
REVEL	Pathogenic	0.91
Sift	Uncertain	0.0010	D
Sift4G	Pathogenic	0.0010	D
Polyphen		1.0	D
Vest4		0.88
MutPred		0.76		Loss of methylation at K272 (P = 0.0886)
MVP		0.96
MPC		2.3
ClinPred		1.0	D
GERP RS		5.0
Varity_R		0.90
gMVP		0.99
Mutation Taster		=25/75	disease causing

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

Other links and lift over

hg19: chrX-151366206;