rs199473101

chr3-38606682-C-Achr3-38606682-C-T

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PM1 PM2 PM5 PP2 PP3_Moderate PP5

The NM_001099404.2(SCN5A):c.1127G>T(p.Arg376Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,460,870 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in Lovd as Likely pathogenic (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R376C) has been classified as Likely pathogenic.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: SCN5A NM_001099404.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.06

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 Pathogenic. Variant got 10 ACMG points.

• PM1: In a intramembrane_region Pore-forming (size 24) in uniprot entity SCN5A_HUMAN there are 14 pathogenic changes around while only 0 benign (100%) in NM_001099404.2
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr3-38606682-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 67639.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• PP2: Missense variant where missense usually causes diseases, SCN5A
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.935
• PP5: Variant 3-38606682-C-A is Pathogenic according to our data. Variant chr3-38606682-C-A is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SCN5A	NM_001099404.2	c.1127G>T	p.Arg376Leu	missense_variant	9/28	ENST00000413689.6
SCN5A	NM_000335.5	c.1127G>T	p.Arg376Leu	missense_variant	9/28	ENST00000423572.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SCN5A	ENST00000413689.6	c.1127G>T	p.Arg376Leu	missense_variant	9/28	5	NM_001099404.2	P4
SCN5A	ENST00000423572.7	c.1127G>T	p.Arg376Leu	missense_variant	9/28	1	NM_000335.5	A1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1460870 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 726652

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: 9.00e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.83
CardioboostArm	Pathogenic	0.92
CardioboostCm	Benign	0.092
BayesDel_addAF	Pathogenic	0.33	D
BayesDel_noAF	Pathogenic	0.24
Cadd	Pathogenic	26
Dann	Uncertain	1.0
Eigen	Uncertain	0.29
Eigen_PC	Uncertain	0.36
FATHMM_MKL	Uncertain	0.97	D
M_CAP	Pathogenic	0.84	D
MetaRNN	Pathogenic	0.93	D;D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	0.94	D
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D;D;D
PrimateAI	Uncertain	0.64	T
PROVEAN	Pathogenic	-4.6	D;D;D;D;D;D;D;D;D
REVEL	Pathogenic	0.79
Sift	Uncertain	0.0090	D;D;D;D;D;D;D;D;D
Sift4G	Uncertain	0.060	T;T;T;T;T;T;T;T;T
Polyphen		0.82	P;D;.;P;.;D;D;.;.
Vest4		0.81
MutPred		0.72		Loss of MoRF binding (P = 0.0574);Loss of MoRF binding (P = 0.0574);Loss of MoRF binding (P = 0.0574);Loss of MoRF binding (P = 0.0574);Loss of MoRF binding (P = 0.0574);Loss of MoRF binding (P = 0.0574);Loss of MoRF binding (P = 0.0574);Loss of MoRF binding (P = 0.0574);Loss of MoRF binding (P = 0.0574);
MVP		0.92
MPC		1.3
ClinPred		0.99	D
GERP RS		4.7
Varity_R		0.41
gMVP		0.98

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: rs199473101; hg19: chr3-38648173;