3-38581079-C-T

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 5P and 2B. PM1PM2PP2BP4_Moderate

The NM_000335.5(SCN5A):c.3080G>A(p.Arg1027Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000409 in 1,613,486 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 13/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.000046 ( 1 hom., cov: 32)

Exomes 𝑓: 0.000040 ( 0 hom. )

Consequence

SCN5A
NM_000335.5 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:11B:1

Conservation

PhyloP100: 1.13

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 3 ACMG points.

PM1

In a topological_domain Cytoplasmic (size 267) in uniprot entity SCN5A_HUMAN there are 26 pathogenic changes around while only 11 benign (70%) in NM_000335.5

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.

BP4

Computational evidence support a benign effect (MetaRNN=0.22782767).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SCN5A	NM_001099404.2 link	c.3080G>A	p.Arg1027Gln	missense_variant	Exon 17 of 28	ENST00000413689.6	NP_001092874.1	Q14524H9KVD2
SCN5A	NM_000335.5 link	c.3080G>A	p.Arg1027Gln	missense_variant	Exon 17 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.3080G>A	p.Arg1027Gln	missense_variant	Exon 17 of 28	5	NM_001099404.2	ENSP00000410257.1		H9KVD2
SCN5A	ENST00000423572.7 link	c.3080G>A	p.Arg1027Gln	missense_variant	Exon 17 of 28	1	NM_000335.5	ENSP00000398266.2		Q14524-2

Frequencies

GnomAD3 genomes

AF:

0.0000461

AC:

AN:

151872

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000883

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000403

AC:

AN:

248354

Hom.:

AF XY:

0.0000445

AC XY:

AN XY:

134846

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000556

Gnomad SAS exome

AF:

0.0000654

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000623

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000404

AC:

AN:

1461614

Hom.:

Cov.:

AF XY:

0.0000468

AC XY:

AN XY:

727082

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000504

Gnomad4 SAS exome

AF:

0.0000812

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000387

Gnomad4 OTH exome

AF:

0.0000497

GnomAD4 genome

AF:

0.0000461

AC:

AN:

151872

Hom.:

Cov.:

AF XY:

0.0000674

AC XY:

AN XY:

74182

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000207

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000883

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000285

Hom.:

Bravo

AF:

0.0000227

ExAC

AF:

0.0000496

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.000119

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:11Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:4Benign:1

Jan 20, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 1027 of the SCN5A protein (p.Arg1027Gln). This variant is present in population databases (rs763891399, gnomAD 0.009%). This missense change has been observed in individual(s) with SCN5A-related conditions (PMID: 17210841, 25904541). ClinVar contains an entry for this variant (Variation ID: 520458). 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. 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. -

Jul 01, 2024

CeGaT Center for Human Genetics Tuebingen

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

SCN5A: PM2 -

Genome Diagnostics Laboratory, University Medical Center Utrecht

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Mar 03, 2015

GeneDx

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Clinical Genetics, Academic Medical Center

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

not specified

Uncertain:2

Jun 22, 2016

Molecular Diagnostic Laboratory for Inherited Cardiovascular Disease, Montreal Heart Institute

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Nov 18, 2024

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: SCN5A c.3080G>A (p.Arg1027Gln) results in a conservative amino acid change located in the Sodium ion transport-associated domain (IPR010526) of the encoded protein sequence. Five of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 4e-05 in 248354 control chromosomes. This frequency is not significantly higher than estimated for a pathogenic variant in SCN5A causing Brugada Syndrome (4e-05 vs 0.00017), allowing no conclusion about variant significance. c.3080G>A has been reported in the literature in individuals affected with long-QT syndrome or restrictive cardiomyopathy, ventricular tachycardia and atrial fibrillation (Kapplinger_2015, Seidelmann_2017). These report(s) do not provide unequivocal conclusions about association of the variant with Brugada Syndrome. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publications have been ascertained in the context of this evaluation (PMID: 22030895, 30143662, 25904541, 28087566, 20403459, 26746457, 17210841). ClinVar contains an entry for this variant (Variation ID: 520458). Based on the evidence outlined above, the variant was classified as uncertain significance. -

Cardiac arrhythmia

Uncertain:2

Sep 23, 2024

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 arginine with glutamine at codon 1027 of the SCN5A protein. Computational prediction 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 Brugada syndrome or long QT syndrome (PMID: 1309946, 25904541). This variant has been identified in 14/276396 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. -

Jan 17, 2024

Color Diagnostics, LLC DBA Color Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Dilated cardiomyopathy 1E

Uncertain:1

Jul 17, 2023

Victorian Clinical Genetics Services, Murdoch Childrens Research Institute

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Based on the classification scheme VCGS_Germline_v1.3.2, this variant is classified as VUS 3C. Following criteria are met: 0103 - Loss of function and gain of function are known mechanisms of disease in this gene (PMID: 29806494). (I) 0108 - This gene is associated with both recessive and dominant disease (OMIM). (I) 0200 - Variant is predicted to result in a missense amino acid change from arginine to glutamine (exon 17). (I) 0251 - This variant is heterozygous. (I) 0302 - Variant is present in gnomAD at a frequency of 0.005% for a dominant condition (14 heterozygotes, 1 homozygote). (SP) 0309 - Alternative amino acid changes at the same position have been observed in gnomAD: p.(Arg1027Trp): 0.0004% (1 heterozygote, 0 homozygote); p.(Arg1027Pro): 0.0004% (1 heterozygote, 0 homozygote). (I) 0502 - Missense variant with conflicting in silico predictions and uninformative conservation. Minor amino acid change, moderate conservation. (I) 0604 - Variant is not located in an established domain, motif, hotspot or informative constraint region. Located in DII/DIII intracellular linker region. (I) 0710 - Another variant comparable to the one identified in this case has inconclusive previous evidence for pathogenicity. p.(Arg1027Trp): ClinVar VUS x1 (Brugada syndrome), PMID: 24981977: one patient with ARVC, PMID: 29544605, one SIDS patient who also had a truncating CSRP3 variant. (I) 0809 - Previous evidence of pathogenicity for this variant is inconclusive. ClinVar: VUS x3 (one Brugada syndrome, two entries with no clinical information), LOVD3: VUS x2. PMID: 25904541: one patient with LQTS; PMID: 28521022: A review paper that refers to this variant as having unknown significance. (I) 0905 - No published segregation evidence has been identified for this variant. (I) 1010 - Functional evidence for this variant is inconclusive. Several studies have used the hH1 construct/SCN5A clone that contains this variant to test the functionality of other SCN5A variants, and results suggested that it is associated with a negative shift of steady state inactivation and slower channel recovery. However, the functional effect of this variant alone is unknown (PMID: 14500339, PMID: 16632547, PMID: 30143662). (I) 1208 - Inheritance information for this variant is not currently available in this individual. (I) Legend: (SP) - Supporting Pathogenic, (I) – Information, (SB) – Supporting Benign -

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

Oct 31, 2018

Fulgent Genetics, Fulgent Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Cardiovascular phenotype

Uncertain:1

Jan 28, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.R1027Q variant (also known as c.3080G>A), located in coding exon 16 of the SCN5A gene, results from a G to A substitution at nucleotide position 3080. The arginine at codon 1027 is replaced by glutamine, an amino acid with highly similar properties. This variant has been reported in an individual with restricted cardiomyopathy and arrhythmias, who also had a co-occurring variant in TNNT2 (Seidelmann SB et al. Circ Cardiovasc Genet, 2017 Feb;10:[Epub ahead of print]). This variant was also detected in one individual from a long QT cohort; however, functional studies were reportedly normal, and clinical details were limited (Kapplinger JD et al. Circ Cardiovasc Genet, 2015 Aug;8:582-95). This amino acid position is not well conserved in available vertebrate species. 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

0.10

CardioboostCm

Benign

0.0011

BayesDel_addAF

Benign

-0.031

BayesDel_noAF

Benign

-0.10

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Benign

0.41

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

Eigen

Benign

-0.000069

Eigen_PC

Benign

-0.065

FATHMM_MKL

Benign

0.33

LIST_S2

Uncertain

0.88

.;D;D;D;D;D;D;.;D

M_CAP

Pathogenic

0.43

MetaRNN

Benign

0.23

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

MetaSVM

Benign

-0.35

MutationAssessor

Benign

1.6

.;L;.;.;.;L;.;.;.

PrimateAI

Benign

0.30

PROVEAN

Benign

-0.92

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

REVEL

Uncertain

0.38

Sift

Benign

0.57

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

Sift4G

Benign

0.63

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

Polyphen

1.0

D;P;.;D;.;D;D;.;.

Vest4

0.35

MutPred

0.14

Loss of helix (P = 0.2662);Loss of helix (P = 0.2662);Loss of helix (P = 0.2662);Loss of helix (P = 0.2662);Loss of helix (P = 0.2662);Loss of helix (P = 0.2662);Loss of helix (P = 0.2662);Loss of helix (P = 0.2662);Loss of helix (P = 0.2662);

MVP

0.93

MPC

0.24

ClinPred

0.14

GERP RS

5.1

Varity_R

0.090

gMVP

0.57

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