rs727504801

chr3-38560396-CG-C

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_001099404.2(SCN5A):c.3995del(p.Pro1332ArgfsTer4) variant causes a frameshift change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. P1332P) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 33)
• Consequence: SCN5A NM_001099404.2 frameshift
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: 9.91

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 Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 3-38560396-CG-C is Pathogenic according to our data. Variant chr3-38560396-CG-C is described in ClinVar as [Pathogenic]. Clinvar id is 179338.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SCN5A	NM_001099404.2	c.3995del	p.Pro1332ArgfsTer4	frameshift_variant	23/28	ENST00000413689.6
SCN5A	NM_000335.5	c.3992del	p.Pro1331ArgfsTer4	frameshift_variant	23/28	ENST00000423572.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SCN5A	ENST00000413689.6	c.3995del	p.Pro1332ArgfsTer4	frameshift_variant	23/28	5	NM_001099404.2	P4
SCN5A	ENST00000423572.7	c.3992del	p.Pro1331ArgfsTer4	frameshift_variant	23/28	1	NM_000335.5	A1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Primary familial dilated cardiomyopathy Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Molecular Diagnostic Laboratory for Inherited Cardiovascular Disease, Montreal Heart Institute

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Primary dilated cardiomyopathy;C1142166:Brugada syndrome Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Oct 21, 2013

The Pro1332fs variant in SCN5A has not been previously reported in individuals w ith cardiomyopathy. This frameshift variant is predicted to alter the protein?s amino acid sequence beginning at position 1332 and lead to a premature terminati on codon 4 amino acids downstream. Heterozygous loss of function variants of the SCN5A gene have been previously reported for DCM (Olson 2005), Brugada syndrome (Kapplinger 2010), ventricular fibrillation (Chen 1998), and atrioventricular b lock and cardiac conduction defects (Baruteau 2012). Individuals with a frameshi ft or missense SCN5A variant and a diagnosis of DCM have been reported to presen t overlapping features with conduction defects, including atrial fibrillation an d arrhythmia (Olson 2005, McNair 2011). In summary, this variant meets our crite ria to be classified as pathogenic (http://pcpgm.partners.org/LMM). -

Computational scores

Source: dbNSFP v4.3

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: rs727504801; hg19: chr3-38601887;