rs115379510

Variant names:

Variant summary

Our verdict is Benign. Variant got -13 ACMG points: 0P and 13B. BP4_StrongBP6BS1BS2

The NM_000334.4(SCN4A):c.2748C>G(p.Asn916Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000458 in 1,614,024 control chromosomes in the GnomAD database, including 3 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.0023 ( 3 hom., cov: 32)

Exomes 𝑓: 0.00027 ( 0 hom. )

Consequence

SCN4A
NM_000334.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:5

Conservation

PhyloP100: 2.39

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 Benign. Variant got -13 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.01139307).

BP6

Variant 17-63951529-G-C is Benign according to our data. Variant chr17-63951529-G-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 194329.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=3, Benign=2, Uncertain_significance=1}. Variant chr17-63951529-G-C is described in Lovd as [Likely_benign].

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.0023 (350/152322) while in subpopulation AFR AF= 0.00808 (336/41566). AF 95% confidence interval is 0.00737. There are 3 homozygotes in gnomad4. There are 182 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

BS2

High Homozygotes in GnomAd4 at 3 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SCN4A	NM_000334.4 link	c.2748C>G	p.Asn916Lys	missense_variant	Exon 14 of 24	ENST00000435607.3	NP_000325.4	P35499

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SCN4A	ENST00000435607.3 link	c.2748C>G	p.Asn916Lys	missense_variant	Exon 14 of 24	1	NM_000334.4	ENSP00000396320.1		P35499

Frequencies

GnomAD3 genomes

AF:

0.00230

AC:

350

AN:

152204

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00811

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000785

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.000606

AC:

151

AN:

249238

Hom.:

AF XY:

0.000503

AC XY:

AN XY:

135218

show subpopulations

Gnomad AFR exome

AF:

0.00911

Gnomad AMR exome

AF:

0.000174

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000885

Gnomad OTH exome

AF:

0.000496

GnomAD4 exome

AF:

0.000266

AC:

389

AN:

1461702

Hom.:

Cov.:

AF XY:

0.000210

AC XY:

153

AN XY:

727134

show subpopulations

Gnomad4 AFR exome

AF:

0.0102

Gnomad4 AMR exome

AF:

0.000246

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:

0.00000630

Gnomad4 OTH exome

AF:

0.000480

GnomAD4 genome

AF:

0.00230

AC:

350

AN:

152322

Hom.:

Cov.:

AF XY:

0.00244

AC XY:

182

AN XY:

74488

show subpopulations

Gnomad4 AFR

AF:

0.00808

Gnomad4 AMR

AF:

0.000784

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000207

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.000473

Alfa

AF:

0.000454

Hom.:

Bravo

AF:

0.00248

ESP6500AA

AF:

0.00674

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000703

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:5

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Benign:2

Oct 31, 2014

Eurofins Ntd Llc (ga)

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Nov 19, 2024

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: SCN4A c.2748C>G (p.Asn916Lys) results in a non-conservative amino acid change in the encoded protein sequence. Three of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.00061 in 249238 control chromosomes, predominantly at a frequency of 0.0091 within the African or African-American subpopulation in the gnomAD database. The observed variant frequency within African or African-American control individuals in the gnomAD database is approximately 8.14 fold of the estimated maximal expected allele frequency for a pathogenic variant in SCN4A causing Congenital Myopathy 22A, Classic phenotype (0.0011). To our knowledge, no occurrence of c.2748C>G in individuals affected with Congenital Myopathy 22A, Classic and no experimental evidence demonstrating its impact on protein function have been reported. ClinVar contains an entry for this variant (Variation ID: 194329). Based on the evidence outlined above, the variant was classified as likely benign. -

not provided

Benign:2

Sep 15, 2021

GeneDx

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Sep 27, 2017

Athena Diagnostics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Inborn genetic diseases

Uncertain:1

Jul 06, 2021

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.2748C>G (p.N916K) alteration is located in exon 14 (coding exon 14) of the SCN4A gene. This alteration results from a C to G substitution at nucleotide position 2748, causing the asparagine (N) at amino acid position 916 to be replaced by a lysine (K). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Hyperkalemic periodic paralysis

Benign:1

Jan 27, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.62

BayesDel_addAF

Benign

-0.31

BayesDel_noAF

Benign

-0.22

CADD

Benign

DANN

Uncertain

0.99

DEOGEN2

Uncertain

0.62

Eigen

Benign

0.11

Eigen_PC

Benign

0.19

FATHMM_MKL

Uncertain

0.92

LIST_S2

Uncertain

0.96

M_CAP

Benign

0.069

MetaRNN

Benign

0.011

MetaSVM

Uncertain

-0.13

MutationAssessor

Pathogenic

3.0

PrimateAI

Uncertain

0.49

PROVEAN

Uncertain

-3.5

REVEL

Uncertain

0.39

Sift

Uncertain

0.0020

Sift4G

Benign

0.15

Polyphen

0.30

Vest4

0.68

MutPred

0.47

Gain of ubiquitination at N916 (P = 0.0138);

MVP

0.76

MPC

0.67

ClinPred

0.061

GERP RS

4.2

Varity_R

0.87

gMVP

0.51

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