chr3-38550533-G-A

Position:

• chr3-38550533-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP2

The NM_001099404.2(SCN5A):​c.5839C>T​(p.Leu1947Phe) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: SCN5A NM_001099404.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 6.51

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 Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), SCN5A. . Gene score misZ 2.7504 (greater than the threshold 3.09). Trascript score misZ 4.7729 (greater than threshold 3.09). GenCC has associacion of gene with progressive familial heart block, type 1A, Brugada syndrome, familial sick sinus syndrome, short QT syndrome, paroxysmal familial ventricular fibrillation, progressive familial heart block, long QT syndrome 3, familial atrial fibrillation, catecholaminergic polymorphic ventricular tachycardia, dilated cardiomyopathy, dilated cardiomyopathy 1E, arrhythmogenic right ventricular cardiomyopathy, Brugada syndrome 1, atrial standstill, familial isolated dilated cardiomyopathy, familial long QT syndrome, sick sinus syndrome 1.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SCN5A	NM_001099404.2	c.5839C>T	p.Leu1947Phe	missense_variant	28/28	ENST00000413689.6
SCN5A	NM_000335.5	c.5836C>T	p.Leu1946Phe	missense_variant	28/28	ENST00000423572.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SCN5A	ENST00000413689.6	c.5839C>T	p.Leu1947Phe	missense_variant	28/28	5	NM_001099404.2	P4
SCN5A	ENST00000423572.7	c.5836C>T	p.Leu1946Phe	missense_variant	28/28	1	NM_000335.5	A1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Feb 28, 2017

This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with a SCN5A-related disease. This variant identified in the SCN5A gene is located in the cytoplasmic C-terminal region of the resulting protein (PMID: 25348405, 12650879), but it is unclear how this variant impacts the function of this protein. In summary, this variant is a novel missense change with uncertain impact on protein function. It has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C15"). This sequence change replaces leucine with phenylalanine at codon 1947 of the SCN5A protein (p.Leu1947Phe). The leucine residue is highly conserved and there is a small physicochemical difference between leucine and phenylalanine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.26
CardioboostCm	Benign	0.010
BayesDel_addAF	Pathogenic	0.34	D
BayesDel_noAF	Pathogenic	0.25
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.55	.;.;.;.;.;D;.;.;.
Eigen	Uncertain	0.45
Eigen_PC	Uncertain	0.50
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.91	.;D;D;D;D;D;D;.;D
M_CAP	Pathogenic	0.30	D
MetaRNN	Uncertain	0.45	T;T;T;T;T;T;T;T;T
MetaSVM	Pathogenic	0.99	D
MutationAssessor	Uncertain	2.1	.;.;.;.;.;M;.;.;.
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D;D;D
PrimateAI	Uncertain	0.52	T
PROVEAN	Benign	-1.3	N;N;N;N;N;N;N;N;N
REVEL	Uncertain	0.63
Sift	Benign	0.24	T;T;T;T;T;T;T;T;T
Sift4G	Benign	0.13	T;T;T;T;T;T;T;T;T
Polyphen		0.26	B;B;.;B;.;B;D;.;.
Vest4		0.57
MutPred		0.26		.;.;Loss of helix (P = 0.028);.;.;Loss of helix (P = 0.028);.;.;.;
MVP		0.72
MPC		1.5
ClinPred		0.97	D
GERP RS		5.0
Varity_R		0.23
gMVP		0.37

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: rs1553692406; hg19: chr3-38592024; COSMIC: COSV104658818; COSMIC: COSV104658818;