rs751294193

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 2P and 5B. PP2PP3BS1_SupportingBS2

The NM_006922.4(SCN3A):c.2021G>A(p.Gly674Asp) variant causes a missense, splice region change. The variant allele was found at a frequency of 0.00000547 in 1,461,504 control chromosomes in the GnomAD database, with no homozygous occurrence. 2/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Uncertain significance (★★). Synonymous variant affecting the same amino acid position (i.e. G674G) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.0 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000055 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

SCN3A
NM_006922.4 missense, splice_region

Scores

Splicing: ADA: 0.9774

Clinical Significance

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

Conservation

PhyloP100: 4.62

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 -3 ACMG points.

PP2

Missense variant where missense usually causes diseases, SCN3A

PP3

Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF. No scorers claiming Uncertain. Scorers claiming Benign: max_spliceai.

BS1

Variant frequency is greater than expected in population amr. gnomad4_exome allele frequency = 0.00000547 (8/1461504) while in subpopulation AMR AF= 0.000179 (8/44706). AF 95% confidence interval is 0.0000886. There are 0 homozygotes in gnomad4_exome. There are 2 alleles in male gnomad4_exome subpopulation. Median coverage is 33. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

BS2

High AC in GnomAdExome at 9 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SCN3A	NM_006922.4 linkuse as main transcript	c.2021G>A	p.Gly674Asp	missense_variant, splice_region_variant	14/28	ENST00000283254.12

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SCN3A	ENST00000283254.12 linkuse as main transcript	c.2021G>A	p.Gly674Asp	missense_variant, splice_region_variant	14/28	1	NM_006922.4	P1	Q9NY46-3

Frequencies

GnomAD3 genomes

AF:

0.00

AC:

AN:

152048

Hom.:

Cov.:

FAILED QC

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:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000359

AC:

AN:

250978

Hom.:

AF XY:

0.0000295

AC XY:

AN XY:

135614

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000261

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:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000547

AC:

AN:

1461504

Hom.:

Cov.:

AF XY:

0.00000275

AC XY:

AN XY:

727048

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000179

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:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Data not reliable, filtered out with message: AC0

AF:

0.00

AC:

AN:

152048

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74260

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:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000756

ExAC

AF:

0.0000824

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Aug 06, 2023	An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. 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. ClinVar contains an entry for this variant (Variation ID: 240708). This variant has not been reported in the literature in individuals affected with SCN3A-related conditions. This variant is present in population databases (rs751294193, gnomAD 0.02%). This sequence change replaces glycine, which is neutral and non-polar, with aspartic acid, which is acidic and polar, at codon 674 of the SCN3A protein (p.Gly674Asp). -
Uncertain significance, criteria provided, single submitter	clinical testing	Athena Diagnostics	Aug 30, 2021	- -

Epilepsy, familial focal, with variable foci 4;C4693699:Developmental and epileptic encephalopathy, 62

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Oct 31, 2018

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.17

BayesDel_addAF

Pathogenic

0.22

BayesDel_noAF

Pathogenic

0.35

Cadd

Pathogenic

Dann

Uncertain

0.99

DEOGEN2

Uncertain

0.67

D;.;.;.;.

Eigen

Uncertain

0.51

Eigen_PC

Uncertain

0.57

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.88

D;D;T;T;T

M_CAP

Uncertain

0.19

MetaRNN

Uncertain

0.51

D;D;D;T;T

MetaSVM

Pathogenic

0.99

MutationAssessor

Uncertain

2.1

M;M;.;.;.

MutationTaster

Benign

1.0

D;D;D

PrimateAI

Uncertain

0.77

PROVEAN

Uncertain

-3.0

D;D;.;D;D

REVEL

Pathogenic

0.69

Sift

Benign

0.042

D;D;.;D;D

Sift4G

Benign

0.32

T;T;.;D;T

Polyphen

0.054

B;B;.;D;D

Vest4

0.70

MutPred

0.29

Gain of glycosylation at T677 (P = 0.0783);Gain of glycosylation at T677 (P = 0.0783);.;.;.;

MVP

0.76

MPC

1.5

ClinPred

0.53

GERP RS

5.7

Varity_R

0.39

gMVP

0.60

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

0.98

dbscSNV1_RF

Pathogenic

0.83

SpliceAI score (max)

0.020

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