chr5-161294091-T-A

Position:

• chr5-161294091-T-A

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PP2 PP3_Moderate

The NM_001371727.1(GABRB2):​c.1529A>T​(p.Tyr510Phe) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. Y510Y) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: GABRB2 NM_001371727.1 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.92

Genes affected

GABRB2 (HGNC:4082): (gamma-aminobutyric acid type A receptor subunit beta2) The gamma-aminobutyric acid (GABA) A receptor is a multisubunit chloride channel that mediates the fastest inhibitory synaptic transmission in the central nervous system. This gene encodes GABA A receptor, beta 2 subunit. It is mapped to chromosome 5q34 in a cluster comprised of genes encoding alpha 1 and gamma 2 subunits of the GABA A receptor. Alternative splicing of this gene generates 2 transcript variants, differing by a 114 bp insertion. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), GABRB2. . Gene score misZ 3.3968 (greater than the threshold 3.09). Trascript score misZ 4.0905 (greater than threshold 3.09). GenCC has associacion of gene with undetermined early-onset epileptic encephalopathy, epileptic encephalopathy, infantile or early childhood, 2.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.917

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GABRB2	NM_001371727.1	c.1529A>T	p.Tyr510Phe	missense_variant	10/10	ENST00000393959.6
GABRB2	NM_021911.3	c.1529A>T	p.Tyr510Phe	missense_variant	11/11
GABRB2	NM_000813.3	c.1415A>T	p.Tyr472Phe	missense_variant	10/10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GABRB2	ENST00000393959.6	c.1529A>T	p.Tyr510Phe	missense_variant	10/10	1	NM_001371727.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Intellectual disability Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Dec 21, 2023

This sequence change replaces tyrosine, which is neutral and polar, with phenylalanine, which is neutral and non-polar, at codon 510 of the GABRB2 protein (p.Tyr510Phe). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with GABRB2-related conditions. 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 GABRB2 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.25
BayesDel_addAF	Pathogenic	0.22	D
BayesDel_noAF	Uncertain	0.080
CADD	Pathogenic	28
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.55	D;D;.;T;.;T
Eigen	Pathogenic	0.80
Eigen_PC	Pathogenic	0.79
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	1.0	.;D;.;D;D;D
M_CAP	Benign	0.075	D
MetaRNN	Pathogenic	0.92	D;D;D;D;D;D
MetaSVM	Uncertain	0.56	D
MutationAssessor	Uncertain	2.6	M;M;.;.;.;.
MutationTaster	Benign	1.0	D;D;D;D;D;D
PrimateAI	Uncertain	0.66	T
PROVEAN	Uncertain	-3.1	D;D;D;D;D;D
REVEL	Pathogenic	0.76
Sift	Uncertain	0.0010	D;D;D;D;D;D
Sift4G	Pathogenic	0.0010	D;D;D;D;D;D
Polyphen		1.0	D;D;D;D;D;P
Vest4		0.73
MutPred		0.84		Gain of sheet (P = 0.0827);Gain of sheet (P = 0.0827);.;.;.;.;
MVP		0.83
MPC		1.0
ClinPred		0.99	D
GERP RS		5.8
Varity_R		0.68
gMVP		0.78

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr5-160721098;