11-118166913-C-T

Position:

• chr11-118166913-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_004588.5(SCN2B):​c.622G>A​(p.Gly208Ser) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: SCN2B NM_004588.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 6.58

Genes affected

SCN2B (HGNC:10589): (sodium voltage-gated channel beta subunit 2) The protein encoded by this gene is the beta 2 subunit of the type II voltage-gated sodium channel. The encoded protein is involved in cell-cell adhesion and cell migration. Defects in this gene can be a cause of Brugada Syndrome, atrial fibrillation, or sudden infant death syndrome. [provided by RefSeq, Jul 2015]

SCN2B (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.27613762).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SCN2B	NM_004588.5	c.622G>A	p.Gly208Ser	missense_variant	4/4	ENST00000278947.6	NP_004579.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SCN2B	ENST00000278947.6	c.622G>A	p.Gly208Ser	missense_variant	4/4	1	NM_004588.5	ENSP00000278947.5
SCN2B	ENST00000658882.1	n.*447G>A		non_coding_transcript_exon_variant	5/5			ENSP00000499572.1
SCN2B	ENST00000669850.1	n.864G>A		non_coding_transcript_exon_variant	4/4
SCN2B	ENST00000658882.1	n.*447G>A		3_prime_UTR_variant	5/5			ENSP00000499572.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Atrial fibrillation, familial, 14 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jun 03, 2023

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. An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. ClinVar contains an entry for this variant (Variation ID: 1378025). This variant has not been reported in the literature in individuals affected with SCN2B-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces glycine, which is neutral and non-polar, with serine, which is neutral and polar, at codon 208 of the SCN2B protein (p.Gly208Ser). -

Cardiovascular phenotype Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 03, 2024

The p.G208S variant (also known as c.622G>A), located in coding exon 4 of the SCN2B gene, results from a G to A substitution at nucleotide position 622. The glycine at codon 208 is replaced by serine, an amino acid with similar properties. This amino acid position is conserved. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Pathogenic	0.17	D
BayesDel_noAF	Uncertain	0.010
CADD	Benign	23
DANN	Uncertain	1.0
DEOGEN2	Benign	0.37	T
Eigen	Benign	0.0048
Eigen_PC	Benign	0.17
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.87	D
M_CAP	Uncertain	0.12	D
MetaRNN	Benign	0.28	T
MetaSVM	Uncertain	0.59	D
MutationAssessor	Benign	2.0	M
PrimateAI	Uncertain	0.55	T
PROVEAN	Benign	-0.020	N
REVEL	Uncertain	0.40
Sift	Benign	0.17	T
Sift4G	Uncertain	0.049	D
Polyphen		0.043	B
Vest4		0.31
MutPred		0.19		Gain of phosphorylation at G208 (P = 0.0065);
MVP		0.99
MPC		0.58
ClinPred		0.96	D
GERP RS		5.0
Varity_R		0.093
gMVP		0.18

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

LitVar

Other links and lift over

dbSNP: rs1024654954; hg19: chr11-118037628;