15-26707944-C-T

Variant names:

• chr15-26707944-C-T
• rs1426224
• NM_000814.6:c.240+64458G>A

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_000814.6(GABRB3):​c.240+64458G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.851 in 152,150 control chromosomes in the GnomAD database, including 57,510 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.85 (57510 hom., cov: 31)
• Consequence: GABRB3 NM_000814.6 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.372
• Publications: 2 publications found

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

ACMG classification

Our verdict: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.98).
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.977 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GABRB3	NM_000814.6	c.240+64458G>A		intron_variant	Intron 3 of 8	ENST00000311550.10	NP_000805.1
GABRB3	NM_021912.5	c.240+64458G>A		intron_variant	Intron 3 of 8		NP_068712.1
GABRB3	NM_001191320.2	c.-16+8670G>A		intron_variant	Intron 1 of 6		NP_001178249.1
GABRB3	NM_001278631.2	c.-112+64458G>A		intron_variant	Intron 3 of 9		NP_001265560.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GABRB3	ENST00000311550.10	c.240+64458G>A		intron_variant	Intron 3 of 8	1	NM_000814.6	ENSP00000308725.5

Frequencies

GnomAD3 genomes AF: 0.851 AC: 129410 AN: 152032 Hom.: 57485 Cov.: 31

Gnomad AFR AF: 0.565

Gnomad AMI AF: 0.882

Gnomad AMR AF: 0.934

Gnomad ASJ AF: 0.990

Gnomad EAS AF: 1.00

Gnomad SAS AF: 0.971

Gnomad FIN AF: 0.968

Gnomad MID AF: 0.930

Gnomad NFE AF: 0.960

Gnomad OTH AF: 0.891

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.851 AC: 129486 AN: 152150 Hom.: 57510 Cov.: 31 AF XY: 0.858 AC XY: 63822 AN XY: 74378

African (AFR) AF: 0.565 AC: 23410 AN: 41446

American (AMR) AF: 0.935 AC: 14291 AN: 15292

Ashkenazi Jewish (ASJ) AF: 0.990 AC: 3434 AN: 3470

East Asian (EAS) AF: 1.00 AC: 5157 AN: 5158

South Asian (SAS) AF: 0.971 AC: 4687 AN: 4826

European-Finnish (FIN) AF: 0.968 AC: 10273 AN: 10612

Middle Eastern (MID) AF: 0.922 AC: 271 AN: 294

European-Non Finnish (NFE) AF: 0.960 AC: 65272 AN: 68026

Other (OTH) AF: 0.893 AC: 1887 AN: 2114

Alfa AF: 0.793 Hom.: 18710

Bravo AF: 0.834

Asia WGS AF: 0.965 AC: 3357 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.98
CADD	Benign	1.0
DANN	Benign	0.68
PhyloP100		-0.37
Mutation Taster		=100/0	polymorphism (auto)

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: rs1426224; hg19: chr15-26953091;