Genetic Variant GABRA1:p.Ser25Ser (chr5-161854158-C-T) – ACMG Classification: Benign (-8 pts)

Variant summary

Our verdict is Benign. The variant received -8 ACMG points: 0P and 8B. BP4_ModerateBP6BP7BS2

The NM_000806.5(GABRA1):c.75C>T(p.Ser25Ser) variant causes a splice region, synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000041 in 1,537,360 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000043 ( 0 hom. )

Consequence

GABRA1
NM_000806.5 splice_region, synonymous

Scores

Splicing: ADA: 0.0004634

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:2

Conservation

PhyloP100: 1.86

Publications

2 publications found

Variant links:

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

GABRA1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -8 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.34).

BP6

Variant 5-161854158-C-T is Benign according to our data. Variant chr5-161854158-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 579311.

BP7

Synonymous conserved (PhyloP=1.87 with no splicing effect.

BS2

High AC in GnomAdExome4 at 60 AD gene.

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

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
GABRA1	NM_001127644.2	MANE Select	c.75C>T	p.Ser25Ser	splice_region synonymous	Exon 3 of 10	NP_001121116.1
GABRA1	NM_000806.5		c.75C>T	p.Ser25Ser	splice_region synonymous	Exon 4 of 11	NP_000797.2
GABRA1	NM_001127643.2		c.75C>T	p.Ser25Ser	splice_region synonymous	Exon 4 of 11	NP_001121115.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
GABRA1	ENST00000393943.10	TSL:1 MANE Select	c.75C>T	p.Ser25Ser	splice_region synonymous	Exon 3 of 10	ENSP00000377517.4
GABRA1	ENST00000023897.10	TSL:1	c.75C>T	p.Ser25Ser	splice_region synonymous	Exon 4 of 11	ENSP00000023897.6
GABRA1	ENST00000428797.7	TSL:1	c.75C>T	p.Ser25Ser	splice_region synonymous	Exon 4 of 11	ENSP00000393097.2

Frequencies

GnomAD3 genomes

AF:

0.0000199

AC:

AN:

151036

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000243

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000296

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000323

AC:

AN:

247944

AF XY:

0.00000746

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000714

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000433

AC:

AN:

1386324

Hom.:

Cov.:

AF XY:

0.0000490

AC XY:

AN XY:

693968

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

31746

American (AMR)

AF:

0.0000226

AC:

AN:

44230

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25538

East Asian (EAS)

AF:

0.00

AC:

AN:

39230

South Asian (SAS)

AF:

0.00

AC:

AN:

83710

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53246

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5628

European-Non Finnish (NFE)

AF:

0.0000565

AC:

AN:

1045128

Other (OTH)

AF:

0.00

AC:

AN:

57868

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.494

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000199

AC:

AN:

151036

Hom.:

Cov.:

AF XY:

0.0000136

AC XY:

AN XY:

73662

show subpopulations

African (AFR)

AF:

0.0000243

AC:

AN:

41158

American (AMR)

AF:

0.00

AC:

AN:

15160

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3458

East Asian (EAS)

AF:

0.00

AC:

AN:

5162

South Asian (SAS)

AF:

0.00

AC:

AN:

4790

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10452

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000296

AC:

AN:

67552

Other (OTH)

AF:

0.00

AC:

AN:

2076

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.492

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0000677

Hom.:

ClinVar

ClinVar submissions as Germline

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

Idiopathic generalized epilepsy;C1970160:Epilepsy, childhood absence 4;C4013473:Epilepsy, idiopathic generalized, susceptibility to, 13 (1)

Inborn genetic diseases (1)

not provided (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.22

BayesDel_noAF

Benign

-0.34

CADD

Benign

(source)

DANN

Benign

0.50

PhyloP100

1.9

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.00046

dbscSNV1_RF

Benign

0.010

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over