rs199473342

chr3-38555691-A-G

Variant summary

Our verdict is Likely pathogenic. Variant got 9 ACMG points: 9P and 0B. PM1 PM2 PP2 PP3_Moderate PP5_Moderate

The NM_001099404.2(SCN5A):c.4507T>C(p.Ser1503Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 13/22 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★). Synonymous variant affecting the same amino acid position (i.e. S1503S) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 31)
• Consequence: SCN5A NM_001099404.2 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1 O:1
• Conservation: PhyloP100: 9.27

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]

ACMG classification

Verdict is Likely_pathogenic. Variant got 9 ACMG points.

• PM1: In a hotspot region, there are 5 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 13 uncertain in NM_001099404.2
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, SCN5A
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.896
• PP5: Variant 3-38555691-A-G is Pathogenic according to our data. Variant chr3-38555691-A-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 67906.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SCN5A	NM_001099404.2	c.4507T>C	p.Ser1503Pro	missense_variant	26/28	ENST00000413689.6
SCN5A	NM_000335.5	c.4504T>C	p.Ser1502Pro	missense_variant	26/28	ENST00000423572.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SCN5A	ENST00000413689.6	c.4507T>C	p.Ser1503Pro	missense_variant	26/28	5	NM_001099404.2	P4
SCN5A	ENST00000423572.7	c.4504T>C	p.Ser1502Pro	missense_variant	26/28	1	NM_000335.5	A1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 31

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1 Other:1

Revision: criteria provided, single submitter

Submissions by phenotype

Cardiovascular phenotype Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 31, 2020

The p.S1503P variant (also known as c.4507T>C), located in coding exon 25 of the SCN5A gene, results from a T to C substitution at nucleotide position 4507. The serine at codon 1503 is replaced by proline, an amino acid with similar properties, and is located in the DIII/DIV interdomain linker region. This variant has been determined to be the result of a de novo mutation or germline mosaicism in one individual with prolonged QT syndrome (Ambry internal data). This amino acid position is highly conserved in available vertebrate species. Based on internal structural analysis, this variant is more disruptive than known pathogenic variants (Shen H et al. Science, 2017 03;355:[Epub ahead of print]). In addition, this alteration is predicted to be deleterious by in silico analysis. Based on the majority of available evidence to date, this variant is likely to be pathogenic. -

Congenital long QT syndrome Other:1

not provided, no classification provided

literature only

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

-

This variant has been reported as associated with Long QT syndrome in the following publications (PMID:17605181). 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	Pathogenic	0.99
CardioboostArm	Pathogenic	1.0
CardioboostCm	Uncertain	0.50
BayesDel_addAF	Pathogenic	0.44	D
BayesDel_noAF	Pathogenic	0.39
Cadd	Pathogenic	27
Dann	Uncertain	1.0
Eigen	Pathogenic	0.80
Eigen_PC	Pathogenic	0.72
FATHMM_MKL	Pathogenic	0.98	D
M_CAP	Pathogenic	0.78	D
MetaRNN	Pathogenic	0.90	D;D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	1.1	D
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D;D;D
PrimateAI	Pathogenic	0.80	T
PROVEAN	Pathogenic	-4.5	D;D;D;D;D;D;D;D;D
REVEL	Pathogenic	0.94
Sift	Uncertain	0.0010	D;D;D;D;D;D;D;D;D
Sift4G	Uncertain	0.0040	D;D;D;D;D;D;D;D;D
Polyphen		1.0	D;P;.;D;.;P;D;.;.
Vest4		0.75
MutPred		0.39		.;.;Loss of phosphorylation at S1503 (P = 0.0248);.;.;Loss of phosphorylation at S1503 (P = 0.0248);.;.;.;
MVP		0.99
MPC		1.6
ClinPred		1.0	D
GERP RS		4.5
Varity_R		0.80
gMVP		0.95

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

Other links and lift over

dbSNP: rs199473342; hg19: chr3-38597182;