rs1060501149

chr3-38550589-A-C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 5P and 1B. PM1 PM2 PP2 BP4

The NM_001099404.2(SCN5A):c.5783T>G(p.Phe1928Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. F1928V) has been classified 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: 2.40

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 4 ACMG points.

• PM1: In a domain IQ (size 29) in uniprot entity SCN5A_HUMAN there are 6 pathogenic changes around while only 2 benign (75%) in NM_001099404.2
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, SCN5A
• BP4: Computational evidence support a benign effect (MetaRNN=0.30007508).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SCN5A	NM_001099404.2	c.5783T>G	p.Phe1928Cys	missense_variant	28/28	ENST00000413689.6
SCN5A	NM_000335.5	c.5780T>G	p.Phe1927Cys	missense_variant	28/28	ENST00000423572.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SCN5A	ENST00000413689.6	c.5783T>G	p.Phe1928Cys	missense_variant	28/28	5	NM_001099404.2	P4
SCN5A	ENST00000423572.7	c.5780T>G	p.Phe1927Cys	missense_variant	28/28	1	NM_000335.5	A1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

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

Invitae

Oct 03, 2016

This sequence change replaces phenylalanine with cysteine at codon 1928 of the SCN5A protein (p.Phe1928Cys). The phenylalanine residue is moderately conserved and there is a large physicochemical difference between phenylalanine and cysteine. 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. 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: "Benign"; Align-GVGD: "Class C55"). 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.28
CardioboostArm	Benign	0.0000029
CardioboostCm	Benign	0.0032
BayesDel_addAF	Uncertain	0.15	D
BayesDel_noAF	Uncertain	-0.020
Cadd	Benign	20
Dann	Benign	0.89
Eigen	Benign	-0.47
Eigen_PC	Benign	-0.38
FATHMM_MKL	Uncertain	0.94	D
M_CAP	Pathogenic	0.52	D
MetaRNN	Benign	0.30	T;T;T;T;T;T;T;T;T
MetaSVM	Uncertain	0.072	D
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D;D;D
PrimateAI	Uncertain	0.59	T
PROVEAN	Uncertain	-2.6	D;D;D;D;D;D;D;D;D
REVEL	Uncertain	0.45
Sift	Benign	0.22	T;T;T;T;T;T;T;T;T
Sift4G	Benign	0.14	T;T;T;T;T;T;T;T;T
Polyphen		0.0	B;B;.;B;.;B;P;.;.
Vest4		0.32
MutPred		0.48		.;.;Loss of helix (P = 3e-04);.;.;Loss of helix (P = 3e-04);.;.;.;
MVP		0.58
MPC		1.5
ClinPred		0.65	D
GERP RS		-1.8
Varity_R		0.60
gMVP		0.66

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: rs1060501149; hg19: chr3-38592080;