rs759584454

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM2PP2BP4_Moderate

The NM_001099404.2(SCN5A):c.2963G>A(p.Arg988Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000248 in 1,610,270 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/23 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R988W) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000073 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000020 ( 0 hom. )

Consequence

SCN5A
NM_001099404.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:7

Conservation

PhyloP100: 0.231

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 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP2

Missense variant where missense usually causes diseases, SCN5A

BP4

Computational evidence support a benign effect (MetaRNN=0.15010011).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SCN5A	NM_001099404.2 linkuse as main transcript	c.2963G>A	p.Arg988Gln	missense_variant	17/28	ENST00000413689.6
SCN5A	NM_000335.5 linkuse as main transcript	c.2963G>A	p.Arg988Gln	missense_variant	17/28	ENST00000423572.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SCN5A	ENST00000413689.6 linkuse as main transcript	c.2963G>A	p.Arg988Gln	missense_variant	17/28	5	NM_001099404.2	P4
SCN5A	ENST00000423572.7 linkuse as main transcript	c.2963G>A	p.Arg988Gln	missense_variant	17/28	1	NM_000335.5	A1	Q14524-2

Frequencies

GnomAD3 genomes

AF:

0.0000726

AC:

AN:

151602

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000485

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000594

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000502

AC:

AN:

238940

Hom.:

AF XY:

0.0000383

AC XY:

AN XY:

130458

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000208

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000574

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000280

Gnomad OTH exome

AF:

0.000172

GnomAD4 exome

AF:

0.0000199

AC:

AN:

1458668

Hom.:

Cov.:

AF XY:

0.0000152

AC XY:

AN XY:

725404

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000204

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000757

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000135

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000726

AC:

AN:

151602

Hom.:

Cov.:

AF XY:

0.000122

AC XY:

AN XY:

74034

show subpopulations

Gnomad4 AFR

AF:

0.0000485

Gnomad4 AMR

AF:

0.000594

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000847

Hom.:

Bravo

AF:

0.0000982

ExAC

AF:

0.0000414

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:7

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Dec 07, 2023	This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 988 of the SCN5A protein (p.Arg988Gln). This variant is present in population databases (rs759584454, gnomAD 0.02%). This missense change has been observed in individuals with Brugada syndrome or dilated cardiomyopathy (PMID: 28341781; Invitae). ClinVar contains an entry for this variant (Variation ID: 201551). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Not Available"; PolyPhen-2: "Benign"; Align-GVGD: "Not Available". The glutamine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. This variant disrupts the p.Arg988 amino acid residue in SCN5A. Other variant(s) that disrupt this residue have been observed in individuals with SCN5A-related conditions (PMID: 23321620), which suggests that this may be a clinically significant amino acid residue. 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. -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Nov 01, 2021	Reported in association with Brugada syndrome (Yamagata et al., 2017); however, specific clinical information was not provided; In silico analysis supports that this missense variant does not alter protein structure/function; Reported in ClinVar as a variant of uncertain significance (ClinVar Variant ID# 201551; Landrum et al., 2016); This variant is associated with the following publications: (PMID: 26582918, 28341781) -

Cardiac arrhythmia

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	All of Us Research Program, National Institutes of Health	Feb 05, 2024	This missense variant replaces arginine with glutamine at codon 988 of the SCN5A protein. Computational prediction tool suggests that this variant may not impact protein structure and function (internally defined REVEL score threshold <=0.5, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has been reported in individuals affected with arrhythmia (PMID: 24190697, 28341781). This variant has been identified in 13/267090 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -
Uncertain significance, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Mar 07, 2023	This missense variant replaces arginine with glutamine at codon 988 of the SCN5A protein. Computational prediction tool suggests that this variant may not impact protein structure and function (internally defined REVEL score threshold <= 0.5, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has been reported in individuals affected with arrhythmia (PMID: 24190697, 28341781). This variant has been identified in 13/267090 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -

Cardiomyopathy

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario

Aug 03, 2022

- -

SUDDEN INFANT DEATH SYNDROME;C1832680:Dilated cardiomyopathy 1E;C1837845:Sick sinus syndrome 1;C1859062:Long QT syndrome 3;C1879286:Progressive familial heart block, type 1A;C2751898:Ventricular fibrillation, paroxysmal familial, type 1;C3151464:Atrial fibrillation, familial, 10;C4551804:Brugada syndrome 1

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Aug 16, 2021

- -

Cardiovascular phenotype

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

May 05, 2023

The p.R988Q variant (also known as c.2963G>A), located in coding exon 16 of the SCN5A gene, results from a G to A substitution at nucleotide position 2963. The arginine at codon 988 is replaced by glutamine, an amino acid with highly similar properties. This variant has been detected in cohorts of patients reported to have Brugada syndrome or Long QT syndrome; however, clinical details were limited (Gómez J et al. J Cardiovasc Transl Res, 2014 Feb;7:133-7; Yamagata K et al. Circulation, 2017 Jun;135:2255-2270; Walsh R et al. Genet Med, 2021 Jan;23:47-58). This variant has also been detected in a cohort undergoing genetic testing for suspected epilepsy and unspecified phenotype (Li X et al. Ann Hum Genet, 2020 Mar;84:161-168). This amino acid position is well conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. 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

0.066

CardioboostArm

Benign

1.9e-7

CardioboostCm

Benign

0.00089

BayesDel_addAF

Benign

-0.20

BayesDel_noAF

Benign

-0.23

Cadd

Benign

Dann

Uncertain

1.0

Eigen

Benign

-0.63

Eigen_PC

Benign

-0.61

FATHMM_MKL

Benign

0.46

M_CAP

Uncertain

0.20

MetaRNN

Benign

0.15

T;T;T;T;T;T;T;T;T

MetaSVM

Benign

-0.65

MutationTaster

Benign

1.0

N;N;N;N;N;N;N;N;N;N

PrimateAI

Benign

0.39

PROVEAN

Benign

-0.79

N;N;N;N;N;N;N;N;N

REVEL

Uncertain

0.37

Sift

Benign

0.044

D;D;D;D;D;D;D;D;D

Sift4G

Benign

0.31

T;T;T;T;T;T;T;T;T

Polyphen

0.0

B;B;.;B;.;B;B;.;.

Vest4

0.16

MutPred

0.58

Gain of helix (P = 0.0034);Gain of helix (P = 0.0034);Gain of helix (P = 0.0034);Gain of helix (P = 0.0034);Gain of helix (P = 0.0034);Gain of helix (P = 0.0034);Gain of helix (P = 0.0034);Gain of helix (P = 0.0034);Gain of helix (P = 0.0034);

MVP

0.76

MPC

0.032

ClinPred

0.060

GERP RS

1.1

Varity_R

0.060

gMVP

0.63

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