NM_001099404.2:c.4218G>A

Variant names:

• chr3-38560174-C-T
• rs41311123
• NM_001099404.2:c.4218G>A

Variant summary

Our verdict is Benign. Variant got -14 ACMG points: 0P and 14B. BP4_Strong BP6 BP7 BS1 BS2

The NM_001099404.2(SCN5A):​c.4218G>A​(p.Gly1406Gly) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0131 in 1,613,512 control chromosomes in the GnomAD database, including 195 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.0082 (6 hom., cov: 33)
  • Exomes 𝑓: 0.014 (189 hom.)
• Consequence: SCN5A NM_001099404.2 synonymous
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:22
• Conservation: PhyloP100: -2.04

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 Benign. Variant got -14 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.49).
• BP6: Variant 3-38560174-C-T is Benign according to our data. Variant chr3-38560174-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 36761.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=2, Benign=14, Uncertain_significance=1}. Variant chr3-38560174-C-T is described in Lovd as [Benign]. Variant chr3-38560174-C-T is described in Lovd as [Likely_benign].
• BP7: Synonymous conserved (PhyloP=-2.05 with no splicing effect.
• BS1: Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.00822 (1252/152292) while in subpopulation NFE AF= 0.0143 (974/68026). AF 95% confidence interval is 0.0136. There are 6 homozygotes in gnomad4. There are 572 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 6 SD gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SCN5A	NM_001099404.2	c.4218G>A	p.Gly1406Gly	synonymous_variant	Exon 23 of 28	ENST00000413689.6	NP_001092874.1
SCN5A	NM_000335.5	c.4215G>A	p.Gly1405Gly	synonymous_variant	Exon 23 of 28	ENST00000423572.7	NP_000326.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SCN5A	ENST00000413689.6	c.4218G>A	p.Gly1406Gly	synonymous_variant	Exon 23 of 28	5	NM_001099404.2	ENSP00000410257.1
SCN5A	ENST00000423572.7	c.4215G>A	p.Gly1405Gly	synonymous_variant	Exon 23 of 28	1	NM_000335.5	ENSP00000398266.2

Frequencies

GnomAD3 genomes AF: 0.00824 AC: 1254 AN: 152174 Hom.: 6 Cov.: 33

Gnomad AFR AF: 0.00297

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00379

Gnomad ASJ AF: 0.00202

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00228

Gnomad FIN AF: 0.00650

Gnomad MID AF: 0.00318

Gnomad NFE AF: 0.0143

Gnomad OTH AF: 0.00525

GnomAD3 exomes AF: 0.00773 AC: 1919 AN: 248288 Hom.: 7 AF XY: 0.00777 AC XY: 1046 AN XY: 134696

Gnomad AFR exome AF: 0.00306

Gnomad AMR exome AF: 0.00262

Gnomad ASJ exome AF: 0.000997

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00273

Gnomad FIN exome AF: 0.00674

Gnomad NFE exome AF: 0.0134

Gnomad OTH exome AF: 0.00697

GnomAD4 exome AF: 0.0136 AC: 19851 AN: 1461220 Hom.: 189 Cov.: 32 AF XY: 0.0131 AC XY: 9486 AN XY: 726838

Gnomad4 AFR exome AF: 0.00269

Gnomad4 AMR exome AF: 0.00260

Gnomad4 ASJ exome AF: 0.00180

Gnomad4 EAS exome AF: 0.0000252

Gnomad4 SAS exome AF: 0.00289

Gnomad4 FIN exome AF: 0.00639

Gnomad4 NFE exome AF: 0.0165

Gnomad4 OTH exome AF: 0.0110

GnomAD4 genome AF: 0.00822 AC: 1252 AN: 152292 Hom.: 6 Cov.: 33 AF XY: 0.00768 AC XY: 572 AN XY: 74468

Gnomad4 AFR AF: 0.00296

Gnomad4 AMR AF: 0.00372

Gnomad4 ASJ AF: 0.00202

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00207

Gnomad4 FIN AF: 0.00650

Gnomad4 NFE AF: 0.0143

Gnomad4 OTH AF: 0.00520

Alfa AF: 0.0119 Hom.: 6

Bravo AF: 0.00791

Asia WGS AF: 0.00115 AC: 4 AN: 3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:22

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not specified Benign:7

Jul 10, 2011

GeneDx

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Mar 19, 2012

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

p.Gly1406Gly in Exon 23 of SCN5A: This variant is not expected to have clinical significance because it does not alter an amino acid residue, is not located wit hin the splice consensus sequence and has been identified in 1.3% (88/6832) of E uropean American chromosomes from a broad population by the NHLBI Exome Sequenci ng Project (http://evs.gs.washington.edu/EVS; dbSNP rs41311123). -

-

PreventionGenetics, part of Exact Sciences

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

-

Clinical Genetics, Academic Medical Center

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

-

Genome Diagnostics Laboratory, University Medical Center Utrecht

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

-

Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

-

Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

not provided Benign:5

Jul 01, 2024

CeGaT Center for Human Genetics Tuebingen

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

SCN5A: BP4, BP7, BS1, BS2 -

-

Diagnostic Laboratory, Department of Genetics, University Medical Center Groningen

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Aug 23, 2023

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Feb 04, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Mar 02, 2018

Athena Diagnostics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Cardiomyopathy Benign:2

May 16, 2023

CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Aug 18, 2011

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: curation

- -

Progressive familial heart block, type 1A Uncertain:1

Apr 27, 2017

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases did not allow this variant to be ruled in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

Brugada syndrome 1 Benign:1

Apr 27, 2017

Illumina Laboratory Services, Illumina

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases was too high to be consistent with this variant causing disease. Therefore, this variant is classified as benign. -

Dilated cardiomyopathy 1E Benign:1

Apr 27, 2017

Illumina Laboratory Services, Illumina

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases was too high to be consistent with this variant causing disease. Therefore, this variant is classified as benign. -

Ventricular fibrillation, paroxysmal familial, type 1 Benign:1

Apr 27, 2017

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases allowed determination this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign. -

Sick sinus syndrome 1 Benign:1

Apr 27, 2017

Illumina Laboratory Services, Illumina

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases was too high to be consistent with this variant causing disease. Therefore, this variant is classified as benign. -

Brugada syndrome Benign:1

Jun 22, 2021

Molecular Genetics Laboratory, BC Children's and BC Women's Hospitals

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Long QT syndrome 3 Benign:1

Apr 27, 2017

Illumina Laboratory Services, Illumina

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases was too high to be consistent with this variant causing disease. Therefore, this variant is classified as benign. -

Cardiovascular phenotype Benign:1

Jun 11, 2015

Ambry Genetics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This alteration is classified as benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Cardiac arrhythmia Benign:1

Mar 08, 2018

Color Diagnostics, LLC DBA Color Health

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.49
CADD	Benign	5.9
DANN	Benign	0.63

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		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: rs41311123; hg19: chr3-38601665;