rs863225273

chr3-38554320-C-T

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_001099404.2(SCN5A):c.4772G>A(p.Trp1591Ter) variant causes a stop gained 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. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency: Genomes: not found (cov: 31)
• Consequence: SCN5A NM_001099404.2 stop_gained
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 7.86

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 12 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most 50 bp of the penultimate exon, not predicted to undergo nonsense mediated mRNA decay. There are 156 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 3-38554320-C-T is Pathogenic according to our data. Variant chr3-38554320-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 217838.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.4772G>A	p.Trp1591Ter	stop_gained	27/28	ENST00000413689.6
SCN5A	NM_000335.5	c.4769G>A	p.Trp1590Ter	stop_gained	27/28	ENST00000423572.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SCN5A	ENST00000413689.6	c.4772G>A	p.Trp1591Ter	stop_gained	27/28	5	NM_001099404.2	P4
SCN5A	ENST00000423572.7	c.4769G>A	p.Trp1590Ter	stop_gained	27/28	1	NM_000335.5	A1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 31

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Brugada syndrome Pathogenic:1

Pathogenic, criteria provided, single submitter

research

Agnes Ginges Centre for Molecular Cardiology, Centenary Institute

Jul 01, 2015

The SCN5A Trp1591* variant was identified in our proband (an Asian male with Brugada syndrome). The proband presented with multiple syncopal episodes and was found to have spontaneous type 1 Brugada pattern. The SCN5A Trp1591* variant is absent from both the 1000 genomes project (http://www.1000genomes.org/), as well as the Exome Aggregation Consortium dataset (http://exac.broadinstitute.org/). The variant was identified in 1 unrelated individual with Brugada syndrome in an international consortium of SCN5A mutations (Kapplinger J. et al., 2010). Loss-of-function in SCN5A is well established as a mechanism of disease in Brugada syndrome (Baroudi G. et al., 2004). Therefore, we have classified this variant as "pathogenic". -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.65
Cadd	Pathogenic	44
Dann	Uncertain	0.99
Eigen	Pathogenic	0.79
Eigen_PC	Uncertain	0.62
FATHMM_MKL	Pathogenic	0.98	D
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D;D;D
Vest4		0.93
GERP RS		3.7

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs863225273; hg19: chr3-38595811; COSMIC: COSV61140869;