chr15-26547968-A-G

Variant names:

• chr15-26547968-A-G
• rs1555400362
• NM_000814.6:c.1247T>C

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_000814.6(GABRB3):​c.1247T>C​(p.Leu416Pro) variant causes a missense 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. 17/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. L416L) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: GABRB3 NM_000814.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.958
• Publications: 0 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: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.078368515).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GABRB3	NM_000814.6	c.1247T>C	p.Leu416Pro	missense_variant	Exon 9 of 9	ENST00000311550.10	NP_000805.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GABRB3	ENST00000311550.10	c.1247T>C	p.Leu416Pro	missense_variant	Exon 9 of 9	1	NM_000814.6	ENSP00000308725.5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Jun 07, 2017

Ambry Genetics

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	0.061
BayesDel_addAF	Benign	-0.035	T
BayesDel_noAF	Benign	-0.29
CADD	Benign	15
DANN	Benign	0.90
DEOGEN2	Benign	0.18	.;T;.;.;.;.;.;.;.
Eigen	Benign	-0.90
Eigen_PC	Benign	-0.70
FATHMM_MKL	Benign	0.14	N
LIST_S2	Benign	0.65	.;T;T;T;T;.;T;T;.
M_CAP	Benign	0.038	D
MetaRNN	Benign	0.078	T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.87	T
MutationAssessor	Benign	-0.48	.;N;.;.;N;.;.;.;.
PhyloP100		0.96
PrimateAI	Benign	0.45	T
PROVEAN	Benign	0.28	.;N;.;N;N;.;.;N;N
REVEL	Benign	0.19
Sift	Benign	0.25	.;T;.;T;T;.;.;T;T
Sift4G	Benign	0.23	T;T;T;T;T;.;.;T;T
Polyphen		0.0	.;B;.;B;B;.;.;.;.
Vest4		0.049
MutPred		0.41		.;.;.;Loss of catalytic residue at L472 (P = 0.022);.;.;.;.;.;
MVP		0.52
MPC		1.8
ClinPred		0.023	T
GERP RS		2.2
Varity_R		0.038
gMVP		0.67

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: rs1555400362; hg19: chr15-26793115;