rs199473074

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2PP2PP3_Moderate

The NM_000335.5(SCN5A):c.688A>G(p.Ile230Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000413 in 1,452,610 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000041 ( 0 hom. )

Consequence

SCN5A
NM_000335.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1O:1

Conservation

PhyloP100: 8.02

Variant links:

Genes affected

SCN5A (HGNC:10593): (sodium voltage-gated channel alpha subunit 5) The protein encoded by this gene is an integral membrane protein and tetrodotoxin-resistant voltage-gated sodium channel subunit. This protein is found primarily in cardiac muscle and is responsible for the initial upstroke of the action potential in an electrocardiogram. Defects in this gene have been associated with long QT syndrome type 3 (LQT3), atrial fibrillation, cardiomyopathy, and Brugada syndrome 1, all autosomal dominant cardiac diseases. Alternative splicing results in several transcript variants encoding different isoforms. [provided by RefSeq, May 2022]

SCN5A links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 5 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP2

Missense variant in the SCN5A gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 99 curated pathogenic missense variants (we use a threshold of 10). The gene has 60 curated benign missense variants. Gene score misZ: 2.7504 (below the threshold of 3.09). Trascript score misZ: 4.8279 (above the threshold of 3.09). GenCC associations: The gene is linked to progressive familial heart block, type 1A, Brugada syndrome, familial sick sinus syndrome, short QT syndrome, paroxysmal familial ventricular fibrillation, progressive familial heart block, long QT syndrome 3, familial atrial fibrillation, catecholaminergic polymorphic ventricular tachycardia, dilated cardiomyopathy, dilated cardiomyopathy 1E, arrhythmogenic right ventricular cardiomyopathy, Brugada syndrome 1, atrial standstill, familial isolated dilated cardiomyopathy, familial long QT syndrome, sick sinus syndrome 1.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.927

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SCN5A	NM_000335.5 link	c.688A>G	p.Ile230Val	missense_variant	Exon 6 of 28	ENST00000423572.7	NP_000326.2	Q14524-2Q86V90
SCN5A	NM_001099404.2 link	c.703+217A>G		intron_variant	Intron 6 of 27	ENST00000413689.6	NP_001092874.1	Q14524H9KVD2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SCN5A	ENST00000423572.7 link	c.688A>G	p.Ile230Val	missense_variant	Exon 6 of 28	1	NM_000335.5	ENSP00000398266.2		Q14524-2
SCN5A	ENST00000413689.6 link	c.703+217A>G		intron_variant	Intron 6 of 27	5	NM_001099404.2	ENSP00000410257.1		H9KVD2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000423

AC:

AN:

236306

Hom.:

AF XY:

0.00000782

AC XY:

AN XY:

127918

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000351

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000413

AC:

AN:

1452610

Hom.:

Cov.:

AF XY:

0.00000416

AC XY:

AN XY:

721788

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000253

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.0000378

Gnomad4 NFE exome

AF:

0.00000271

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ExAC

AF:

0.00000827

AC:

Asia WGS

AF:

0.00260

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1Other:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Oct 18, 2019

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces isoleucine with valine at codon 230 of the SCN5A protein (p.Ile230Val). The isoleucine residue is highly conserved and there is a small physicochemical difference between isoleucine and valine. 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. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C25"). This variant has been observed in an individual affected with Brugada syndrome (PMID: 11901046). ClinVar contains an entry for this variant (Variation ID: 68035). This variant is present in population databases (rs199473074, ExAC 0.01%). -

Brugada syndrome

Other:1

Cardiovascular Biomedical Research Unit, Royal Brompton & Harefield NHS Foundation Trust

Significance: not provided

Review Status: no classification provided

Collection Method: literature only

This variant has been reported as associated with Brugada syndrome in the following publications (PMID:11901046). This is a literature report, and does not necessarily reflect the clinical interpretation of the Imperial College / Royal Brompton Cardiovascular Genetics laboratory. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.15

CardioboostCm

Benign

0.060

BayesDel_addAF

Pathogenic

0.33

BayesDel_noAF

Pathogenic

0.24

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.72

.;D;.

Eigen

Benign

0.0089

Eigen_PC

Benign

0.085

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Benign

0.79

T;T;T

M_CAP

Uncertain

0.26

MetaRNN

Pathogenic

0.93

D;D;D

MetaSVM

Uncertain

0.65

MutationAssessor

Benign

0.36

N;N;.

PROVEAN

Benign

-0.64

N;N;N

REVEL

Pathogenic

0.69

Sift

Benign

0.18

T;T;T

Sift4G

Benign

0.41

T;T;T

Polyphen

0.23

B;D;.

Vest4

0.70

MutPred

0.90

Gain of ubiquitination at K228 (P = 0.1215);Gain of ubiquitination at K228 (P = 0.1215);Gain of ubiquitination at K228 (P = 0.1215);

MVP

0.95

ClinPred

0.81

GERP RS

2.8

Varity_R

0.099

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over