rs587777309

chr5-161895726-A-C

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM1 PM2 PP2 PP3_Moderate PP5

The NM_001127644.2(GABRA1):c.917A>C(p.Lys306Thr) 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 Pathogenic (no stars).

• Frequency: Genomes: not found (cov: 32)
• Consequence: GABRA1 NM_001127644.2 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 9.21

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 8 ACMG points.

• PM1: In a hotspot region, there are 7 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 2 uncertain in NM_001127644.2
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, GABRA1
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.924
• PP5: Variant 5-161895726-A-C is Pathogenic according to our data. Variant chr5-161895726-A-C is described in ClinVar as [Pathogenic]. Clinvar id is 127075.Status of the report is no_assertion_criteria_provided, 0 stars. Variant chr5-161895726-A-C is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GABRA1	NM_001127644.2	c.917A>C	p.Lys306Thr	missense_variant	9/10	ENST00000393943.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GABRA1	ENST00000393943.10	c.917A>C	p.Lys306Thr	missense_variant	9/10	1	NM_001127644.2	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 35

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Developmental and epileptic encephalopathy, 19 Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Apr 08, 2014

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.97
BayesDel_addAF	Pathogenic	0.42	D
BayesDel_noAF	Pathogenic	0.37
Cadd	Pathogenic	29
Dann	Uncertain	1.0
DEOGEN2	Pathogenic	0.85	D;D;D;D;D;D;.;D;D
Eigen	Pathogenic	0.87
Eigen_PC	Pathogenic	0.84
FATHMM_MKL	Pathogenic	0.99	D
M_CAP	Pathogenic	0.70	D
MetaRNN	Pathogenic	0.92	D;D;D;D;D;D;D;D;D
MetaSVM	Uncertain	0.62	D
MutationAssessor	Pathogenic	3.5	M;M;M;M;M;M;.;M;M
MutationTaster	Benign	1.0	D;D;D;D;D;D
PrimateAI	Pathogenic	0.91	D
Polyphen		0.99	D;D;D;D;D;D;.;D;D
Vest4		0.94, 0.88, 0.94, 0.94
MutPred		0.66		Loss of methylation at K306 (P = 0.004);Loss of methylation at K306 (P = 0.004);Loss of methylation at K306 (P = 0.004);Loss of methylation at K306 (P = 0.004);Loss of methylation at K306 (P = 0.004);Loss of methylation at K306 (P = 0.004);.;Loss of methylation at K306 (P = 0.004);Loss of methylation at K306 (P = 0.004);
MVP		0.95
MPC		3.7
ClinPred		1.0	D
GERP RS		5.5
Varity_R		0.91
gMVP		0.98

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: rs587777309; hg19: chr5-161322732;