chr15-26622262-C-T

Variant names:

• chr15-26622262-C-T
• rs2873027
• NM_000814.6:c.241-728G>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.241-728G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.362 in 151,972 control chromosomes in the GnomAD database, including 10,633 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 0.36 (10633 hom., cov: 32)
• Consequence: GABRB3 NM_000814.6 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.351
• Publications: 8 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=-0.97).
• BA1: GnomAd4 highest subpopulation (NFE) allele frequency at 95% confidence interval = 0.431 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GABRB3	NM_000814.6	c.241-728G>A		intron_variant	Intron 3 of 8	ENST00000311550.10	NP_000805.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GABRB3	ENST00000311550.10	c.241-728G>A		intron_variant	Intron 3 of 8	1	NM_000814.6	ENSP00000308725.5

Frequencies

GnomAD3 genomes AF: 0.362 AC: 54952 AN: 151854 Hom.: 10633 Cov.: 32

Gnomad AFR AF: 0.254

Gnomad AMI AF: 0.460

Gnomad AMR AF: 0.328

Gnomad ASJ AF: 0.396

Gnomad EAS AF: 0.159

Gnomad SAS AF: 0.374

Gnomad FIN AF: 0.430

Gnomad MID AF: 0.478

Gnomad NFE AF: 0.435

Gnomad OTH AF: 0.390

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

GnomAD4 genome AF: 0.362 AC: 54968 AN: 151972 Hom.: 10633 Cov.: 32 AF XY: 0.360 AC XY: 26724 AN XY: 74254

African (AFR) AF: 0.254 AC: 10512 AN: 41462

American (AMR) AF: 0.327 AC: 4994 AN: 15252

Ashkenazi Jewish (ASJ) AF: 0.396 AC: 1373 AN: 3464

East Asian (EAS) AF: 0.159 AC: 822 AN: 5162

South Asian (SAS) AF: 0.373 AC: 1799 AN: 4818

European-Finnish (FIN) AF: 0.430 AC: 4533 AN: 10532

Middle Eastern (MID) AF: 0.469 AC: 138 AN: 294

European-Non Finnish (NFE) AF: 0.435 AC: 29555 AN: 67976

Other (OTH) AF: 0.392 AC: 824 AN: 2104

Alfa AF: 0.413 Hom.: 7010

Bravo AF: 0.349

Asia WGS AF: 0.286 AC: 996 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.97
CADD	Benign	0.39
DANN	Benign	0.57
PhyloP100		-0.35
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: rs2873027; hg19: chr15-26867409;