rs774195502

Positions:

chr2-165155865-C-T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 3P and 5B. PS1_ModeratePP2BS1_SupportingBS2

The NM_006922.4(SCN3A):c.1070G>A(p.Arg357Gln) variant causes a missense change. The variant allele was found at a frequency of 0.0000558 in 1,613,984 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★). Another nucleotide change resulting in same amino acid change has been previously reported as Likely pathogenicin UniProt.

Frequency

Genomes: 𝑓 0.000059 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000055 ( 0 hom. )

Consequence

SCN3A
NM_006922.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts P:1U:3

Conservation

PhyloP100: 4.12

Variant links:

Genes affected

SCN3A (HGNC:10590): (sodium voltage-gated channel alpha subunit 3) 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, and is found in a cluster of five alpha subunit genes on chromosome 2. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

SCN3A links:

(HGNC:):

links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

PS1

Transcript NM_006922.4 (SCN3A) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in UniProt

PP2

Missense variant in gene, where missense usually causes diseases (based on misZ statistic), SCN3A. . Gene score misZ 4.618 (greater than the threshold 3.09). Trascript score misZ 6.3553 (greater than threshold 3.09). GenCC has associacion of gene with undetermined early-onset epileptic encephalopathy, developmental and epileptic encephalopathy, epilepsy, familial focal, with variable foci 4, developmental and epileptic encephalopathy, 62.

BS1

Variant frequency is greater than expected in population afr. gnomad4_exome allele frequency = 0.0000554 (81/1461876) while in subpopulation AFR AF= 0.0000896 (3/33480). AF 95% confidence interval is 0.0000525. There are 0 homozygotes in gnomad4_exome. There are 37 alleles in male gnomad4_exome subpopulation. Median coverage is 32. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

BS2

High AC in GnomAd4 at 9 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SCN3A	NM_006922.4 linkuse as main transcript	c.1070G>A	p.Arg357Gln	missense_variant	10/28	ENST00000283254.12	NP_008853.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SCN3A	ENST00000283254.12 linkuse as main transcript	c.1070G>A	p.Arg357Gln	missense_variant	10/28	1	NM_006922.4	ENSP00000283254	P1	Q9NY46-3

Frequencies

GnomAD3 genomes

AF:

0.0000592

AC:

AN:

152108

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000724

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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:

0.0000735

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000517

AC:

AN:

251482

Hom.:

AF XY:

0.0000662

AC XY:

AN XY:

135916

show subpopulations

Gnomad AFR exome

AF:

0.0000615

Gnomad AMR exome

AF:

0.00

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:

0.000105

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000554

AC:

AN:

1461876

Hom.:

Cov.:

AF XY:

0.0000509

AC XY:

AN XY:

727236

show subpopulations

Gnomad4 AFR exome

AF:

0.0000896

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000464

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000647

Gnomad4 OTH exome

AF:

0.0000331

GnomAD4 genome

AF:

0.0000592

AC:

AN:

152108

Hom.:

Cov.:

AF XY:

0.0000673

AC XY:

AN XY:

74294

show subpopulations

Gnomad4 AFR

AF:

0.0000724

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000207

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000735

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000851

Hom.:

Bravo

AF:

0.0000529

ExAC

AF:

0.0000659

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.000119

ClinVar

Significance: Uncertain significance

Submissions summary: Pathogenic:1Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:3

Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Oct 22, 2023	This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 357 of the SCN3A protein (p.Arg357Gln). This variant is present in population databases (rs774195502, gnomAD 0.009%). This missense change has been observed in individual(s) with clinical features of SCN3A-related conditions (PMID: 24157691). ClinVar contains an entry for this variant (Variation ID: 522563). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt SCN3A protein function. Experimental studies have shown that this missense change affects SCN3A function (PMID: 24157691). 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. -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Oct 09, 2023	Reported previously in a single individual with focal epilepsy but no segregation information was available. Aside from SCN1A testing, no additional testing to rule out other possible causes of epilepsy was reported (Vanoye et al., 2014); Published functional studies demonstrate that the R357Q variant affects protein function consistent with hyper-excitability (Vanoye et al., 2014); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 28488083, 31589614, 33236643, 29466837, 24157691) -
Uncertain significance, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Sep 19, 2019	- -

Epilepsy, familial focal, with variable foci 4

Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Sep 01, 2020

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.15

BayesDel_addAF

Benign

-0.048

BayesDel_noAF

Benign

-0.10

CADD

Uncertain

DANN

Pathogenic

1.0

DEOGEN2

Pathogenic

0.80

D;.;.;.;.

Eigen

Uncertain

0.19

Eigen_PC

Uncertain

0.23

FATHMM_MKL

Uncertain

0.88

LIST_S2

Uncertain

0.91

D;D;D;D;D

M_CAP

Pathogenic

0.63

MetaRNN

Uncertain

0.54

D;D;D;D;D

MetaSVM

Pathogenic

0.98

MutationAssessor

Benign

1.7

L;L;.;L;.

MutationTaster

Benign

0.94

D;D;D

PrimateAI

Uncertain

0.64

PROVEAN

Uncertain

-3.0

D;D;.;D;D

REVEL

Pathogenic

0.81

Sift

Uncertain

0.0020

D;D;.;D;D

Sift4G

Benign

0.51

T;T;.;T;T

Polyphen

0.014

B;B;.;P;P

Vest4

0.69

MutPred

0.40

Gain of relative solvent accessibility (P = 0.0166);Gain of relative solvent accessibility (P = 0.0166);Gain of relative solvent accessibility (P = 0.0166);Gain of relative solvent accessibility (P = 0.0166);Gain of relative solvent accessibility (P = 0.0166);

MVP

0.80

MPC

1.4

ClinPred

0.32

GERP RS

3.6

Varity_R

0.40

gMVP

0.84

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