3-38581137-G-C

Variant names:

• chr3-38581137-G-C
• NM_001099404.2:c.3022C>G

Variant summary

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

The NM_000335.5(SCN5A):​c.3022C>G​(p.Pro1008Ala) 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 1,460,956 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: SCN5A NM_000335.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.97

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 topological_domain Cytoplasmic (size 267) in uniprot entity SCN5A_HUMAN there are 26 pathogenic changes around while only 11 benign (70%) in NM_000335.5
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the SCN5A gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 99 curated pathogenic missense variants (we use a threshold of 10). The gene has 60 curated benign missense variants. Gene score misZ: 2.7504 (below the threshold of 3.09). Trascript score misZ: 4.8279 (above the threshold of 3.09). GenCC associations: The gene is linked to 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.
• BP4: Computational evidence support a benign effect (MetaRNN=0.36174458).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SCN5A	NM_001099404.2	c.3022C>G	p.Pro1008Ala	missense_variant	Exon 17 of 28	ENST00000413689.6	NP_001092874.1
SCN5A	NM_000335.5	c.3022C>G	p.Pro1008Ala	missense_variant	Exon 17 of 28	ENST00000423572.7	NP_000326.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SCN5A	ENST00000413689.6	c.3022C>G	p.Pro1008Ala	missense_variant	Exon 17 of 28	5	NM_001099404.2	ENSP00000410257.1
SCN5A	ENST00000423572.7	c.3022C>G	p.Pro1008Ala	missense_variant	Exon 17 of 28	1	NM_000335.5	ENSP00000398266.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1460956 Hom.: 0 Cov.: 36 AF XY: 0.00 AC XY: 0 AN XY: 726760

Gnomad4 AFR exome AF: 0.00

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: 0.0000166

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Cardiovascular phenotype Uncertain:1

Apr 16, 2019

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.P1008A variant (also known as c.3022C>G), located in coding exon 16 of the SCN5A gene, results from a C to G substitution at nucleotide position 3022. The proline at codon 1008 is replaced by alanine, an amino acid with highly similar properties. An alternate substitution at this codon, p.P1008S, was reported in a family with cardiac conduction defects, although some affected relatives had an additional cardiac variant detected (Hu D et al. Pacing Clin Electrophysiol, 2010 Mar;33:274-85). This amino acid position is poorly conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.059
CardioboostCm	Benign	0.00093
BayesDel_addAF	Benign	-0.027	T
BayesDel_noAF	Benign	-0.28
CADD	Benign	8.2
DANN	Benign	0.41
DEOGEN2	Benign	0.39	.;.;.;.;.;T;.;.;.
Eigen	Benign	-0.94
Eigen_PC	Benign	-0.91
FATHMM_MKL	Benign	0.49	N
LIST_S2	Benign	0.81	.;T;T;T;T;T;T;.;T
M_CAP	Uncertain	0.16	D
MetaRNN	Benign	0.36	T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.85	T
MutationAssessor	Benign	0.55	.;N;.;.;.;N;.;.;.
PrimateAI	Benign	0.29	T
PROVEAN	Benign	-0.80	N;N;N;N;N;N;N;N;N
REVEL	Uncertain	0.39
Sift	Benign	1.0	T;T;T;T;T;T;T;T;T
Sift4G	Benign	0.75	T;T;T;T;T;T;T;T;T
Polyphen		0.0	B;B;.;B;.;B;B;.;.
Vest4		0.23
MutPred		0.46		Loss of glycosylation at P1008 (P = 0.0087);Loss of glycosylation at P1008 (P = 0.0087);Loss of glycosylation at P1008 (P = 0.0087);Loss of glycosylation at P1008 (P = 0.0087);Loss of glycosylation at P1008 (P = 0.0087);Loss of glycosylation at P1008 (P = 0.0087);Loss of glycosylation at P1008 (P = 0.0087);Loss of glycosylation at P1008 (P = 0.0087);Loss of glycosylation at P1008 (P = 0.0087);
MVP		0.64
MPC		0.029
ClinPred		0.029	T
GERP RS		0.67
Varity_R		0.023
gMVP		0.58

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr3-38622628;