3-38603887-G-C

Position:

• chr3-38603887-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 5P and 4B. PM2 PM5 PP2 BP4_Strong

The NM_001099404.2(SCN5A):​c.1715C>G​(p.Ala572Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,636 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict 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. A572F) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: SCN5A NM_001099404.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.497

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 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr3-38603887-G-T is described in Lovd as [Pathogenic].
• PP2: Missense variant where missense usually causes diseases, SCN5A
• BP4: Computational evidence support a benign effect (MetaRNN=0.048695773).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SCN5A	NM_001099404.2	c.1715C>G	p.Ala572Gly	missense_variant	12/28	ENST00000413689.6
SCN5A	NM_000335.5	c.1715C>G	p.Ala572Gly	missense_variant	12/28	ENST00000423572.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SCN5A	ENST00000413689.6	c.1715C>G	p.Ala572Gly	missense_variant	12/28	5	NM_001099404.2	P4
SCN5A	ENST00000423572.7	c.1715C>G	p.Ala572Gly	missense_variant	12/28	1	NM_000335.5	A1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461636 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 727118

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

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

Sep 13, 2019

Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals with SCN5A-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change replaces alanine with glycine at codon 572 of the SCN5A protein (p.Ala572Gly). The alanine residue is moderately conserved and there is a small physicochemical difference between alanine and glycine. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.086
CardioboostCm	Benign	0.00057
BayesDel_addAF	Benign	-0.023	T
BayesDel_noAF	Benign	-0.27
CADD	Benign	17
DANN	Benign	0.97
Eigen	Benign	-0.60
Eigen_PC	Benign	-0.43
FATHMM_MKL	Benign	0.15	N
M_CAP	Uncertain	0.20	D
MetaRNN	Benign	0.049	T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.70	T
MutationTaster	Benign	1.0	N;N;N;N;N;N;N;N;N;N
PrimateAI	Benign	0.27	T
PROVEAN	Benign	-0.25	N;N;N;N;N;N;N;N;N
REVEL	Benign	0.21
Sift	Benign	0.50	T;T;T;T;T;T;T;T;T
Sift4G	Benign	0.40	T;T;T;T;T;T;T;T;T
Polyphen		0.0	B;B;.;B;.;B;B;.;.
Vest4		0.32
MutPred		0.35		Gain of glycosylation at S571 (P = 0.085);Gain of glycosylation at S571 (P = 0.085);Gain of glycosylation at S571 (P = 0.085);Gain of glycosylation at S571 (P = 0.085);Gain of glycosylation at S571 (P = 0.085);Gain of glycosylation at S571 (P = 0.085);Gain of glycosylation at S571 (P = 0.085);Gain of glycosylation at S571 (P = 0.085);Gain of glycosylation at S571 (P = 0.085);
MVP		0.43
MPC		0.35
ClinPred		0.12	T
GERP RS		3.2
Varity_R		0.041
gMVP		0.63

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: rs36210423; hg19: chr3-38645378;