NM_001099404.2:c.1535C>T

Variant names:

Variant summary

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

The NM_001099404.2(SCN5A):c.1535C>T(p.Thr512Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000131 in 1,450,940 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: 32)

Exomes 𝑓: 0.000013 ( 0 hom. )

Consequence

SCN5A
NM_001099404.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:6O:2

Conservation

PhyloP100: 0.638

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: 4.7729 (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, 0.889

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SCN5A	NM_001099404.2 link	c.1535C>T	p.Thr512Ile	missense_variant	Exon 12 of 28	ENST00000413689.6	NP_001092874.1	Q14524H9KVD2
SCN5A	NM_000335.5 link	c.1535C>T	p.Thr512Ile	missense_variant	Exon 12 of 28	ENST00000423572.7	NP_000326.2	Q14524-2Q86V90

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SCN5A	ENST00000413689.6 link	c.1535C>T	p.Thr512Ile	missense_variant	Exon 12 of 28	5	NM_001099404.2	ENSP00000410257.1		H9KVD2
SCN5A	ENST00000423572.7 link	c.1535C>T	p.Thr512Ile	missense_variant	Exon 12 of 28	1	NM_000335.5	ENSP00000398266.2		Q14524-2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000437

AC:

AN:

229040

Hom.:

AF XY:

0.00000806

AC XY:

AN XY:

124042

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:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000969

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000131

AC:

AN:

1450940

Hom.:

Cov.:

AF XY:

0.0000125

AC XY:

AN XY:

720618

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000238

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000136

Gnomad4 OTH exome

AF:

0.0000333

GnomAD4 genome

Cov.:

Alfa

AF:

0.0000279

Hom.:

Bravo

AF:

0.0000113

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.000259

AC:

ExAC

AF:

0.00000827

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:6Other:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:4

Feb 17, 2017

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: The SCN5A c.1535C>T (p.Thr512Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. 2/3 in silico tools predict a benign outcome for this variant (SNPs&GO not captured due to low reliability index). This variant was found in 1/67122 control chromosomes at a frequency of 0.0000149, which does not exceed the estimated maximal expected allele frequency of a pathogenic SCN5A variant (0.0001). This variant was identified in at least one pt with cardiac conduction disease without strong segregation due to possibly reduced penetrance and in 2 patients with DCM/HCM. Functional study showed that the variant caused abnormal gating effects. GeneReviews cites this variant as pathogenic, although other clinical diagnostic laboratories classify the variant as VUS. Taking together, the variant is classified as VUS-Possibly Pathogenic. -

May 26, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces threonine, which is neutral and polar, with isoleucine, which is neutral and non-polar, at codon 512 of the SCN5A protein (p.Thr512Ile). 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. Experimental studies have shown that this missense change affects SCN5A function (PMID: 12569159). 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 tolerated. ClinVar contains an entry for this variant (Variation ID: 67665). This missense change has been observed in individual(s) with atrioventricular (AV) conduction block and cardiomyopathy (PMID: 12569159, 27554632). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. -

Sep 27, 2023

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant does not alter protein structure/function; Reported in patients with arrhythmia and cardiomyopathy and in an unaffected relative (Viswanathan et al., 2003; Priganc et al., 2016); This variant is associated with the following publications: (PMID: 12569159, 27554632, 29728395) -

Apr 22, 2016

Stanford Center for Inherited Cardiovascular Disease, Stanford University

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: provider interpretation

The variant has been reported in one 2-year-old individual with second-degree atrioventricular (AV) block (Viswanathan 2003). Functional expression studies showed that voltage-dependent activation and inactivation had enhanced slow activation and slow recovery from inactivation when compared to wildtype (OMIM 600163.0031; Viswanathan 2003). -

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

Feb 24, 2022

Fulgent Genetics, Fulgent Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Cardiac arrhythmia

Uncertain:1

Oct 02, 2023

All of Us Research Program, National Institutes of Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This missense variant replaces threonine with isoleucine at codon 512 of the SCN5A protein. Computational prediction is inconclusive regarding the impact of this variant on protein structure and function (internally defined REVEL score threshold 0.5 < inconclusive < 0.7, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. A functional study has suggested that this variant may affect sodium channel function (PMID: 12569159). This variant has been reported in an individual affected with atrioventricular block (PMID: 12569159), as well as in an individual affected with dilated cardiomyopathy and an individual affected with hypertrophic cardiomyopathy (PMID: 27554632). This variant has been identified in 1/229040 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. -

Brugada syndrome 1

Other:1

GeneReviews

Significance: not provided

Review Status: no classification provided

Collection Method: literature only

- -

Conduction system disorder

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 Cardiac conduction disease in the following publications (PMID:12569159). 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

0.0045

BayesDel_addAF

Pathogenic

0.17

BayesDel_noAF

Uncertain

0.010

CADD

Benign

DANN

Benign

0.96

DEOGEN2

Uncertain

0.47

.;.;.;.;.;T;.;.;.

Eigen

Benign

-1.2

Eigen_PC

Benign

-1.1

FATHMM_MKL

Benign

0.22

LIST_S2

Benign

0.71

.;T;T;T;T;T;T;.;T

M_CAP

Uncertain

0.27

MetaRNN

Pathogenic

0.89

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

MetaSVM

Benign

-0.53

MutationAssessor

Benign

0.55

.;N;.;.;.;N;.;.;.

PrimateAI

Benign

0.36

PROVEAN

Benign

-0.56

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

REVEL

Uncertain

0.54

Sift

Benign

0.14

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

Sift4G

Benign

0.18

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

Polyphen

0.0

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

Vest4

0.64

MutPred

0.72

Loss of relative solvent accessibility (P = 0.0186);Loss of relative solvent accessibility (P = 0.0186);Loss of relative solvent accessibility (P = 0.0186);Loss of relative solvent accessibility (P = 0.0186);Loss of relative solvent accessibility (P = 0.0186);Loss of relative solvent accessibility (P = 0.0186);Loss of relative solvent accessibility (P = 0.0186);Loss of relative solvent accessibility (P = 0.0186);Loss of relative solvent accessibility (P = 0.0186);

MVP

0.96

MPC

0.38

ClinPred

0.060

GERP RS

0.47

Varity_R

0.047

gMVP

0.62

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