chr15-26772717-T-G

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM1BP4BS2

The NM_000814.6(GABRB3):c.136A>C(p.Lys46Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000101 in 1,577,364 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000011 ( 0 hom. )

Consequence

GABRB3
NM_000814.6 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 2.04

Publications

1 publications found

Variant links:

Genes affected

GABRB3 (HGNC:4083): (gamma-aminobutyric acid type A receptor subunit beta3) This gene encodes a member of the ligand-gated ionic channel family. The encoded protein is one the subunits of a multi-subunit chloride channel that serves as the receptor for gamma-aminobutyric acid, a major inhibitory neurotransmitter of the mammalian nervous system. This gene is located on the long arm of chromosome 15 in a cluster with two other genes encoding related subunits of the family. This gene may be associated with the pathogenesis of several disorders including Angelman syndrome, Prader-Willi syndrome, nonsyndromic orofacial clefts, epilepsy and autism. Alternatively spliced transcript variants encoding distinct isoforms have been described. [provided by RefSeq, Jul 2013]

GABRB3 Gene-Disease associations (from GenCC):

developmental and epileptic encephalopathy, 43
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
epilepsy, childhood absence, susceptibility to, 5
Inheritance: AD, Unknown Classification: DEFINITIVE, LIMITED Submitted by: G2P, Labcorp Genetics (formerly Invitae)
genetic developmental and epileptic encephalopathy
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
childhood absence epilepsy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
Lennox-Gastaut syndrome
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

GABRB3 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

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

PM1

In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 10 uncertain in NM_000814.6

BP4

Computational evidence support a benign effect (MetaRNN=0.4026756).

BS2

High AC in GnomAdExome4 at 15 AD,Unknown gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GABRB3	NM_000814.6 link	c.136A>C	p.Lys46Gln	missense_variant	Exon 2 of 9	ENST00000311550.10	NP_000805.1	P28472-1
GABRB3	NM_021912.5 link	c.136A>C	p.Lys46Gln	missense_variant	Exon 2 of 9		NP_068712.1	P28472-2B2RCW8X5DQY4
GABRB3	NM_001278631.2 link	c.-216A>C		5_prime_UTR_variant	Exon 2 of 10		NP_001265560.1	P28472-4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GABRB3	ENST00000311550.10 link	c.136A>C	p.Lys46Gln	missense_variant	Exon 2 of 9	1	NM_000814.6	ENSP00000308725.5		P28472-1

Frequencies

GnomAD3 genomes

AF:

0.00000660

AC:

AN:

151506

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000656

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.0000105

AC:

AN:

1425858

Hom.:

Cov.:

AF XY:

0.0000113

AC XY:

AN XY:

709236

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

30096

American (AMR)

AF:

0.00

AC:

AN:

41794

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

24738

East Asian (EAS)

AF:

0.00

AC:

AN:

35810

South Asian (SAS)

AF:

0.00

AC:

AN:

82924

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52844

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5636

European-Non Finnish (NFE)

AF:

0.0000119

AC:

AN:

1093570

Other (OTH)

AF:

0.0000342

AC:

AN:

58446

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.502

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:

0.00000660

AC:

AN:

151506

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

73960

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41312

American (AMR)

AF:

0.0000656

AC:

AN:

15236

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3466

East Asian (EAS)

AF:

0.00

AC:

AN:

5022

South Asian (SAS)

AF:

0.00

AC:

AN:

4800

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10482

Middle Eastern (MID)

AF:

0.00

AC:

AN:

312

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

67878

Other (OTH)

AF:

0.00

AC:

AN:

2086

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Epilepsy, childhood absence, susceptibility to, 1;C2677087:Epilepsy, childhood absence, susceptibility to, 5

Uncertain:1

Jul 19, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces lysine, which is basic and polar, with glutamine, which is neutral and polar, at codon 46 of the GABRB3 protein (p.Lys46Gln). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with GABRB3-related conditions. ClinVar contains an entry for this variant (Variation ID: 377036). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on GABRB3 protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

not provided

Uncertain:1

Nov 14, 2016

Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.10

BayesDel_addAF

Uncertain

0.012

BayesDel_noAF

Benign

-0.22

CADD

Benign

(source)

DANN

Uncertain

0.99

DEOGEN2

Benign

0.22

T;.;.;.

Eigen

Benign

-0.25

Eigen_PC

Benign

-0.12

FATHMM_MKL

Uncertain

0.92

LIST_S2

Uncertain

0.92

D;D;D;D

M_CAP

Pathogenic

0.71

MetaRNN

Benign

0.40

T;T;T;T

MetaSVM

Benign

-0.75

MutationAssessor

Benign

1.5

L;.;L;.

PhyloP100

2.0

PrimateAI

Pathogenic

0.88

PROVEAN

Benign

-0.60

N;N;N;.

REVEL

Uncertain

0.31

Sift

Benign

0.15

T;T;T;.

Sift4G

Benign

0.11

T;T;T;.

Polyphen

0.056

B;B;B;.

Vest4

0.38

MutPred

0.41

.;Loss of ubiquitination at K102 (P = 0.0326);.;.;

MVP

0.84

MPC

1.9

ClinPred

0.78

GERP RS

3.0

PromoterAI

0.030

Neutral

(source)

Varity_R

0.41

gMVP

0.86

Mutation Taster

=52/48

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over