chr5-161854233-A-T

Variant names:

• chr5-161854233-A-T
• rs1006797468
• NM_001127644.2:c.150A>T

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The NM_000806.5(GABRA1):​c.150A>T​(p.Leu50Leu) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. L50L) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: GABRA1 NM_000806.5 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.353
• Publications: 0 publications found

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]

GABRA1 Gene-Disease associations (from GenCC):

• developmental and epileptic encephalopathy, 19

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, G2P
• genetic developmental and epileptic encephalopathy

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• epilepsy, idiopathic generalized, susceptibility to, 13

  Inheritance: AD Classification: STRONG Submitted by: G2P
• Dravet syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• juvenile myoclonic epilepsy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.74).
• BP7: Synonymous conserved (PhyloP=-0.353 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000806.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GABRA1	NM_001127644.2	MANE Select	c.150A>T	p.Leu50Leu	synonymous	Exon 3 of 10	NP_001121116.1
	GABRA1	NM_000806.5		c.150A>T	p.Leu50Leu	synonymous	Exon 4 of 11	NP_000797.2
	GABRA1	NM_001127643.2		c.150A>T	p.Leu50Leu	synonymous	Exon 4 of 11	NP_001121115.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GABRA1	ENST00000393943.10	TSL:1 MANE Select	c.150A>T	p.Leu50Leu	synonymous	Exon 3 of 10	ENSP00000377517.4
	GABRA1	ENST00000023897.10	TSL:1	c.150A>T	p.Leu50Leu	synonymous	Exon 4 of 11	ENSP00000023897.6
	GABRA1	ENST00000428797.7	TSL:1	c.150A>T	p.Leu50Leu	synonymous	Exon 4 of 11	ENSP00000393097.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 28

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.74
CADD	Benign	2.6
DANN	Benign	0.69
PhyloP100		-0.35

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

dbSNP: rs1006797468; hg19: chr5-161281239;