rs797045590

Positions:

• chr5-161873303-A-T

Variant summary

Our verdict is Likely pathogenic. Variant got 9 ACMG points: 9P and 0B. PM1 PM2 PP2 PP3_Strong

The NM_001127644.2(GABRA1):​c.442A>T​(p.Ile148Phe) 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 Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: GABRA1 NM_001127644.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.38

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]

ACMG classification

Verdict is Likely_pathogenic. Variant got 9 ACMG points.

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 2 benign, 3 uncertain in NM_001127644.2
• 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.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.955

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GABRA1	NM_001127644.2	c.442A>T	p.Ile148Phe	missense_variant	5/10	ENST00000393943.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GABRA1	ENST00000393943.10	c.442A>T	p.Ile148Phe	missense_variant	5/10	1	NM_001127644.2	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Genetic Services Laboratory, University of Chicago

Mar 04, 2015

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.95
BayesDel_addAF	Pathogenic	0.42	D
BayesDel_noAF	Pathogenic	0.37
CADD	Pathogenic	26
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.89	D;D;D;D;D;D;D;.;D;.;D
Eigen	Uncertain	0.65
Eigen_PC	Pathogenic	0.67
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.97	.;.;.;.;.;D;.;D;.;D;D
M_CAP	Pathogenic	0.43	D
MetaRNN	Pathogenic	0.95	D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Uncertain	0.40	D
MutationAssessor	Pathogenic	3.2	M;M;M;M;M;.;M;.;M;.;M
MutationTaster	Benign	1.0	D;D;D;D;D;D
PrimateAI	Pathogenic	0.89	D
PROVEAN	Uncertain	-3.2	.;D;D;D;D;.;.;.;.;.;.
REVEL	Pathogenic	0.89
Sift	Uncertain	0.0010	.;D;D;D;D;.;.;.;.;.;.
Sift4G	Uncertain	0.023	.;D;D;D;D;D;.;.;.;D;.
Polyphen		0.74	P;P;P;P;P;.;P;.;P;.;P
Vest4		0.88, 0.92
MutPred		0.82		Loss of stability (P = 0.0912);Loss of stability (P = 0.0912);Loss of stability (P = 0.0912);Loss of stability (P = 0.0912);Loss of stability (P = 0.0912);Loss of stability (P = 0.0912);Loss of stability (P = 0.0912);.;Loss of stability (P = 0.0912);Loss of stability (P = 0.0912);Loss of stability (P = 0.0912);
MVP		0.94
MPC		2.2
ClinPred		0.98	D
GERP RS		5.5
Varity_R		0.78
gMVP		0.99

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs797045590; hg19: chr5-161300309;