NM_001099404.2:c.3841-1704C>G

Variant names:

• chr3-38564241-G-C
• rs7374138
• NM_001099404.2:c.3841-1704C>G

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_001099404.2(SCN5A):​c.3841-1704C>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.759 in 151,952 control chromosomes in the GnomAD database, including 43,908 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.76 (43908 hom., cov: 30)
• Consequence: SCN5A NM_001099404.2 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.51
• Publications: 11 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: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-1.0).
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.874 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SCN5A	NM_001099404.2	c.3841-1704C>G		intron_variant	Intron 21 of 27	ENST00000413689.6	NP_001092874.1
SCN5A	NM_000335.5	c.3838-1704C>G		intron_variant	Intron 21 of 27	ENST00000423572.7	NP_000326.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SCN5A	ENST00000413689.6	c.3841-1704C>G		intron_variant	Intron 21 of 27	5	NM_001099404.2	ENSP00000410257.1
SCN5A	ENST00000423572.7	c.3838-1704C>G		intron_variant	Intron 21 of 27	1	NM_000335.5	ENSP00000398266.2

Frequencies

GnomAD3 genomes AF: 0.759 AC: 115259 AN: 151834 Hom.: 43867 Cov.: 30

Gnomad AFR AF: 0.780

Gnomad AMI AF: 0.852

Gnomad AMR AF: 0.754

Gnomad ASJ AF: 0.629

Gnomad EAS AF: 0.896

Gnomad SAS AF: 0.814

Gnomad FIN AF: 0.827

Gnomad MID AF: 0.747

Gnomad NFE AF: 0.729

Gnomad OTH AF: 0.735

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.759 AC: 115358 AN: 151952 Hom.: 43908 Cov.: 30 AF XY: 0.763 AC XY: 56695 AN XY: 74270

African (AFR) AF: 0.781 AC: 32334 AN: 41412

American (AMR) AF: 0.754 AC: 11520 AN: 15274

Ashkenazi Jewish (ASJ) AF: 0.629 AC: 2183 AN: 3470

East Asian (EAS) AF: 0.896 AC: 4609 AN: 5144

South Asian (SAS) AF: 0.813 AC: 3908 AN: 4808

European-Finnish (FIN) AF: 0.827 AC: 8747 AN: 10576

Middle Eastern (MID) AF: 0.735 AC: 216 AN: 294

European-Non Finnish (NFE) AF: 0.729 AC: 49516 AN: 67954

Other (OTH) AF: 0.735 AC: 1550 AN: 2110

Alfa AF: 0.735 Hom.: 5127

Bravo AF: 0.755

Asia WGS AF: 0.829 AC: 2881 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-1.0
CADD	Benign	0.31
DANN	Benign	0.67
PhyloP100		-1.5
Mutation Taster		=100/0	polymorphism (auto)

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: rs7374138; hg19: chr3-38605732;