3-38630349-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PP2 PP3_Moderate

The NM_001099404.2(SCN5A):c.354C>A(p.His118Gln) variant causes a missense change. The variant allele was found at a frequency of 0.00000657 in 152,250 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in same amino acid change has been previously reported as Uncertain significancein ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. H118P) has been classified as Uncertain significance.

• Frequency: Genomes: 𝑓 0.0000066 (0 hom., cov: 32)
• Consequence: SCN5A NM_001099404.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 4.63

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 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, SCN5A
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.871

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SCN5A	NM_001099404.2	c.354C>A	p.His118Gln	missense_variant	3/28	ENST00000413689.6
SCN5A	NM_000335.5	c.354C>A	p.His118Gln	missense_variant	3/28	ENST00000423572.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SCN5A	ENST00000413689.6	c.354C>A	p.His118Gln	missense_variant	3/28	5	NM_001099404.2	P4
SCN5A	ENST00000423572.7	c.354C>A	p.His118Gln	missense_variant	3/28	1	NM_000335.5	A1

Frequencies

GnomAD3 genomes AF: 0.00000657 AC: 1 AN: 152250 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.0000941

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome Cov.: 30

GnomAD4 genome AF: 0.00000657 AC: 1 AN: 152250 Hom.: 0 Cov.: 32 AF XY: 0.0000134 AC XY: 1 AN XY: 74394

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.0000941

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.70
CardioboostArm	Uncertain	0.77
CardioboostCm	Uncertain	0.43
BayesDel_addAF	Pathogenic	0.31	D
BayesDel_noAF	Pathogenic	0.20
Cadd	Uncertain	24
Dann	Uncertain	0.99
Eigen	Uncertain	0.65
Eigen_PC	Uncertain	0.63
FATHMM_MKL	Uncertain	0.93	D
M_CAP	Pathogenic	0.60	D
MetaRNN	Pathogenic	0.87	D;D;D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	0.92	D
MutationTaster	Benign	0.99	D;D;D;D;D;D;D;D;D;D
PrimateAI	Benign	0.46	T
PROVEAN	Uncertain	-2.9	D;D;D;D;D;D;D;D;D;.
REVEL	Pathogenic	0.75
Sift	Uncertain	0.0010	D;D;D;D;D;D;D;D;D;.
Sift4G	Uncertain	0.0020	D;D;D;D;D;D;D;D;D;D
Polyphen		0.97	D;D;.;D;.;D;D;.;.;.
Vest4		0.70
MutPred		0.60		Loss of methylation at R122 (P = 0.0728);Loss of methylation at R122 (P = 0.0728);Loss of methylation at R122 (P = 0.0728);Loss of methylation at R122 (P = 0.0728);Loss of methylation at R122 (P = 0.0728);Loss of methylation at R122 (P = 0.0728);Loss of methylation at R122 (P = 0.0728);Loss of methylation at R122 (P = 0.0728);Loss of methylation at R122 (P = 0.0728);Loss of methylation at R122 (P = 0.0728);
MVP		0.91
MPC		1.1
ClinPred		0.99	D
GERP RS		5.1
Varity_R		0.55
gMVP		0.79

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: rs45533640; hg19: chr3-38671840;