rs199473575

chr3-38603926-G-Achr3-38603926-G-Cchr3-38603926-G-T

Variant summary

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

The NM_001099404.2(SCN5A):c.1676C>T(p.Thr559Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000248 in 1,613,878 control chromosomes in the GnomAD database, with no homozygous occurrence. 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 Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T559K) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000021 ( 0 hom. )

Consequence

SCN5A
NM_001099404.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2O:1

Conservation

PhyloP100: 1.46

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=0.17436394).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SCN5A	NM_001099404.2 linkuse as main transcript	c.1676C>T	p.Thr559Ile	missense_variant	12/28	ENST00000413689.6
SCN5A	NM_000335.5 linkuse as main transcript	c.1676C>T	p.Thr559Ile	missense_variant	12/28	ENST00000423572.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SCN5A	ENST00000413689.6 linkuse as main transcript	c.1676C>T	p.Thr559Ile	missense_variant	12/28	5	NM_001099404.2	P4
SCN5A	ENST00000423572.7 linkuse as main transcript	c.1676C>T	p.Thr559Ile	missense_variant	12/28	1	NM_000335.5	A1	Q14524-2

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152220

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:

0.000193

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:

0.0000161

AC:

AN:

249138

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135186

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000223

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000205

AC:

AN:

1461658

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

727124

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000504

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152220

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74368

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000193

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000756

ExAC

AF:

0.00000826

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2Other:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:1Other:1

not provided, no classification provided	literature only	Cardiovascular Biomedical Research Unit, Royal Brompton & Harefield NHS Foundation Trust	-	This variant has been reported in the following publications (PMID:18362431). -
Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Oct 24, 2022	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 (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. ClinVar contains an entry for this variant (Variation ID: 67677). This missense change has been observed in individual(s) with dilated cardiomyopathy (PMID: 31983221). This variant is present in population databases (rs199473575, gnomAD 0.02%). This sequence change replaces threonine, which is neutral and polar, with isoleucine, which is neutral and non-polar, at codon 559 of the SCN5A protein (p.Thr559Ile). -

Cardiac arrhythmia

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Color Diagnostics, LLC DBA Color Health

Aug 03, 2021

This missense variant replaces threonine with isoleucine at codon 559 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 not been reported in individuals affected with cardiovascular disorders in the literature. This variant has been identified in a healthy individual (PMID: 18362431) and in 4/249138 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.18

CardioboostArm

Benign

0.0000015

CardioboostCm

Benign

0.0016

BayesDel_addAF

Benign

-0.15

BayesDel_noAF

Benign

-0.16

Cadd

Benign

Dann

Uncertain

1.0

Eigen

Benign

-0.24

Eigen_PC

Benign

-0.22

FATHMM_MKL

Uncertain

0.86

M_CAP

Pathogenic

0.41

MetaRNN

Benign

0.17

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

MetaSVM

Uncertain

-0.084

MutationTaster

Benign

0.83

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

PrimateAI

Benign

0.43

PROVEAN

Uncertain

-2.5

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

REVEL

Uncertain

0.30

Sift

Benign

0.038

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

Sift4G

Benign

0.098

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

Polyphen

0.26

B;P;.;B;.;P;P;.;.

Vest4

0.23

MutPred

0.39

Loss of catalytic residue at T559 (P = 0.0427);Loss of catalytic residue at T559 (P = 0.0427);Loss of catalytic residue at T559 (P = 0.0427);Loss of catalytic residue at T559 (P = 0.0427);Loss of catalytic residue at T559 (P = 0.0427);Loss of catalytic residue at T559 (P = 0.0427);Loss of catalytic residue at T559 (P = 0.0427);Loss of catalytic residue at T559 (P = 0.0427);Loss of catalytic residue at T559 (P = 0.0427);

MVP

0.53

MPC

0.41

ClinPred

0.12

GERP RS

2.4

Varity_R

0.062

gMVP

0.71

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