17-63949426-C-T

Position:

chr17-63949426-C-T

Variant summary

Our verdict is Likely benign. Variant got -1 ACMG points: 0P and 1B. BP4

The NM_000334.4(SCN4A):c.2956G>A(p.Glu986Lys) variant causes a missense change. The variant allele was found at a frequency of 0.0000263 in 1,596,512 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000033 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000026 ( 0 hom. )

Consequence

SCN4A
NM_000334.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:4

Conservation

PhyloP100: 4.90

Variant links:

Genes affected

SCN4A (HGNC:10591): (sodium voltage-gated channel alpha subunit 4) Voltage-gated sodium channels are transmembrane glycoprotein complexes composed of a large alpha subunit with 24 transmembrane domains and one or more regulatory beta subunits. They are responsible for the generation and propagation of action potentials in neurons and muscle. This gene encodes one member of the sodium channel alpha subunit gene family. It is expressed in skeletal muscle, and mutations in this gene have been linked to several myotonia and periodic paralysis disorders. [provided by RefSeq, Jul 2008]

SCN4A links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -1 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.38588426).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SCN4A	NM_000334.4 link	c.2956G>A	p.Glu986Lys	missense_variant	15/24	ENST00000435607.3	NP_000325.4	P35499

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SCN4A	ENST00000435607.3 link	c.2956G>A	p.Glu986Lys	missense_variant	15/24	1	NM_000334.4	ENSP00000396320.1		P35499
SCN4A	ENST00000584310.1 link	n.279G>A		non_coding_transcript_exon_variant	1/3	4

Frequencies

GnomAD3 genomes

AF:

0.0000329

AC:

AN:

152162

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

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:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000441

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000228

AC:

AN:

219540

Hom.:

AF XY:

0.0000335

AC XY:

AN XY:

119422

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000318

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000619

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000309

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000256

AC:

AN:

1444350

Hom.:

Cov.:

AF XY:

0.0000363

AC XY:

AN XY:

717114

show subpopulations

Gnomad4 AFR exome

AF:

0.0000603

Gnomad4 AMR exome

AF:

0.0000237

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000257

Gnomad4 SAS exome

AF:

0.0000358

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000245

Gnomad4 OTH exome

AF:

0.0000502

GnomAD4 genome

AF:

0.0000329

AC:

AN:

152162

Hom.:

Cov.:

AF XY:

0.0000404

AC XY:

AN XY:

74322

show subpopulations

Gnomad4 AFR

AF:

0.0000483

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000441

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000659

Hom.:

Bravo

AF:

0.0000529

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000259

AC:

ExAC

AF:

0.0000249

AC:

Asia WGS

AF:

0.000577

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Dec 05, 2022	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	Jan 12, 2023	- -

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Athena Diagnostics

Feb 03, 2017

- -

Hyperkalemic periodic paralysis

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Dec 12, 2024

This sequence change replaces glutamic acid, which is acidic and polar, with lysine, which is basic and polar, at codon 986 of the SCN4A protein (p.Glu986Lys). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This variant has not been reported in the literature in individuals affected with SCN4A-related conditions. ClinVar contains an entry for this variant (Variation ID: 448268). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is not expected to disrupt SCN4A protein function with a negative predictive value of 95%. 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

0.17

BayesDel_addAF

Uncertain

0.049

BayesDel_noAF

Benign

-0.17

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.65

Eigen

Uncertain

0.35

Eigen_PC

Uncertain

0.39

FATHMM_MKL

Uncertain

0.93

LIST_S2

Benign

0.75

M_CAP

Uncertain

0.14

MetaRNN

Benign

0.39

MetaSVM

Uncertain

-0.22

MutationAssessor

Uncertain

2.6

PrimateAI

Uncertain

0.52

PROVEAN

Uncertain

-2.9

REVEL

Uncertain

0.44

Sift

Benign

0.049

Sift4G

Benign

0.29

Polyphen

0.49

Vest4

0.38

MVP

0.77

MPC

0.48

ClinPred

0.58

GERP RS

3.7

Varity_R

0.41

gMVP

0.41

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over