rs199473165

Variant names:

• chr3-38585951-T-C
• rs199473165
• NM_001099404.2:c.2527A>G

Variant summary

Our verdict is Likely pathogenic. The variant received 8 ACMG points: 8P and 0B. PM2 PP3_Strong PP5_Moderate

The NM_001099404.2(SCN5A):​c.2527A>G​(p.Thr843Ala) 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. Variant has been reported in ClinVar as Pathogenic (★). Synonymous variant affecting the same amino acid position (i.e. T843T) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: SCN5A NM_001099404.2 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:1 O:1
• Conservation: PhyloP100: 8.02
• Publications: 6 publications found

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 Gene-Disease associations (from GenCC):

• Brugada syndrome

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet
• Brugada syndrome 1

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Laboratory for Molecular Medicine, G2P, Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
• dilated cardiomyopathy

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• dilated cardiomyopathy 1E

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae), Ambry Genetics
• familial long QT syndrome

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• long QT syndrome 3

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), G2P
• sick sinus syndrome 1

  Inheritance: AD, AR Classification: STRONG, LIMITED Submitted by: Labcorp Genetics (formerly Invitae)
• progressive familial heart block, type 1A

  Inheritance: SD, AD Classification: STRONG, MODERATE Submitted by: Ambry Genetics, Genomics England PanelApp
• atrial standstill

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• familial atrial fibrillation

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• familial isolated dilated cardiomyopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• familial sick sinus syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• paroxysmal familial ventricular fibrillation

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• progressive familial heart block

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• arrhythmogenic right ventricular cardiomyopathy

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen
• catecholaminergic polymorphic ventricular tachycardia

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen
• short QT syndrome

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

ACMG classification

Our verdict: Likely_pathogenic. The variant received 8 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.979
• PP5: Variant 3-38585951-T-C is Pathogenic according to our data. Variant chr3-38585951-T-C is described in ClinVar as Pathogenic. ClinVar VariationId is 67739.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SCN5A	NM_001099404.2	c.2527A>G	p.Thr843Ala	missense_variant	Exon 16 of 28	ENST00000413689.6	NP_001092874.1
SCN5A	NM_000335.5	c.2527A>G	p.Thr843Ala	missense_variant	Exon 16 of 28	ENST00000423572.7	NP_000326.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SCN5A	ENST00000413689.6	c.2527A>G	p.Thr843Ala	missense_variant	Exon 16 of 28	5	NM_001099404.2	ENSP00000410257.1
SCN5A	ENST00000423572.7	c.2527A>G	p.Thr843Ala	missense_variant	Exon 16 of 28	1	NM_000335.5	ENSP00000398266.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 36

GnomAD4 genome Cov.: 32

Alfa AF: 0.000688 Hom.: 0

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1 Other:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Pathogenic:1

Sep 14, 2011

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

p.Thr843Ala in the SCN5A gene; published, disease-causing mutation (Berge KE et al. 2008) The A>G nucleotide substitution in exon 16 of the SCN5A gene, results in replacement of the normal Threonine codon (ACA) with an Alanine codon (GCA) at amino acid position 843 in the cardiac sodium voltage-gated channel, type V-a. This missense change is denoted Thr843Ala (aka T843A) at the protein level and c.2527 A>G at the cDNA level. The Thr843Ala mutation in the SCN5A gene has been published previously in association with LQTS. Berge et al. (2008) reported Thr843Ala in a single Norwegian individual referred for LQTS testing and did not observe the mutation in 188 Norwegian control alleles (Berge KE et al. 2008). In addition, the Thr843Ala mutation was not detected in 400 alleles from control individuals of Caucasian and African American ancestry tested at GeneDx, indicating it is not a common benign variant in these populations. Thr843Ala results in a non-conservative amino acid substitution of a polar Threonine with a non-polar Alanine at a residue that is highly conserved across species. Additionally, in silico analysis predicts Thr843Ala is probably damaging to the protein structure/function (Adzhubei IA et al. 2010). Furthermore, mutations at surrounding codons (G840R, I839P, S835L, I848F) have been reported in association with LQTS or Brugada syndrome, further supporting the functional significance of this region of the protein. The variant is found in LQT panel(s). -

Congenital long QT syndrome Other:1

-

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

Significance: not provided

Review Status: no classification provided

Collection Method: literature only

This variant has been reported as associated with Long QT syndrome in the following publications (PMID:16244680;PMID:18752142). 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	0.96
CardioboostArm	Pathogenic	1.0
CardioboostCm	Uncertain	0.78
BayesDel_addAF	Pathogenic	0.54	D
BayesDel_noAF	Pathogenic	0.54
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.96	.;.;.;.;.;D;.;.;.
Eigen	Uncertain	0.63
Eigen_PC	Uncertain	0.60
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Benign	0.81	.;T;T;T;T;T;T;.;T
M_CAP	Pathogenic	0.79	D
MetaRNN	Pathogenic	0.98	D;D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Benign	1.9	.;M;.;.;.;M;.;.;.
PhyloP100		8.0
PrimateAI	Pathogenic	0.87	D
PROVEAN	Pathogenic	-4.9	D;D;D;D;D;D;D;D;D
REVEL	Pathogenic	0.97
Sift	Uncertain	0.0010	D;D;D;D;D;D;D;D;D
Sift4G	Uncertain	0.0050	D;D;D;D;D;D;D;D;D
Polyphen		1.0	D;D;.;D;.;D;D;.;.
Vest4		0.95
MutPred		0.90		Loss of catalytic residue at T843 (P = 0.3906);Loss of catalytic residue at T843 (P = 0.3906);Loss of catalytic residue at T843 (P = 0.3906);Loss of catalytic residue at T843 (P = 0.3906);Loss of catalytic residue at T843 (P = 0.3906);Loss of catalytic residue at T843 (P = 0.3906);Loss of catalytic residue at T843 (P = 0.3906);Loss of catalytic residue at T843 (P = 0.3906);Loss of catalytic residue at T843 (P = 0.3906);
MVP		1.0
MPC		1.1
ClinPred		0.99	D
GERP RS		4.4
Varity_R		0.90
gMVP		0.92
Mutation Taster		=0/100	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs199473165; hg19: chr3-38627442;