rs367949317

Positions:

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 1P and 13B. PP2BP4_StrongBP6BS1BS2

The NM_014191.4(SCN8A):c.1819G>A(p.Ala607Thr) variant causes a missense change. The variant allele was found at a frequency of 0.000105 in 1,596,556 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. A607A) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00057 ( 0 hom., cov: 31)

Exomes 𝑓: 0.000056 ( 1 hom. )

Consequence

SCN8A
NM_014191.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:7

Conservation

PhyloP100: 3.64

Variant links:

Genes affected

SCN8A (HGNC:10596): (sodium voltage-gated channel alpha subunit 8) This gene encodes a member of the sodium channel alpha subunit gene family. The encoded protein forms the ion pore region of the voltage-gated sodium channel. This protein is essential for the rapid membrane depolarization that occurs during the formation of the action potential in excitable neurons. Mutations in this gene are associated with cognitive disability, pancerebellar atrophy and ataxia. Alternate splicing results in multiple transcript variants.[provided by RefSeq, May 2010]

SCN8A links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -12 ACMG points.

PP2

Missense variant in gene, where missense usually causes diseases (based on misZ statistic), SCN8A. . Gene score misZ 0.78755 (greater than the threshold 3.09). Trascript score misZ 10.278 (greater than threshold 3.09). GenCC has associacion of gene with myoclonus, familial, 2, infantile convulsions and choreoathetosis, cognitive impairment with or without cerebellar ataxia, undetermined early-onset epileptic encephalopathy, complex neurodevelopmental disorder, developmental and epileptic encephalopathy, 13, benign familial infantile epilepsy, seizures, benign familial infantile, 5.

BP4

Computational evidence support a benign effect (MetaRNN=0.01388976).

BP6

Variant 12-51721729-G-A is Benign according to our data. Variant chr12-51721729-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 194088.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=2, Uncertain_significance=1, Benign=2}. Variant chr12-51721729-G-A is described in Lovd as [Likely_benign].

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.000571 (87/152292) while in subpopulation AFR AF= 0.00176 (73/41574). AF 95% confidence interval is 0.00143. There are 0 homozygotes in gnomad4. There are 46 alleles in male gnomad4 subpopulation. Median coverage is 31. This position pass quality control queck.

BS2

High AC in GnomAd4 at 87 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
SCN8A	NM_001330260.2 linkuse as main transcript	c.1819G>A	p.Ala607Thr	missense_variant	12/27	ENST00000627620.5
SCN8A	NM_014191.4 linkuse as main transcript	c.1819G>A	p.Ala607Thr	missense_variant	12/27	ENST00000354534.11
SCN8A	NM_001177984.3 linkuse as main transcript	c.1819G>A	p.Ala607Thr	missense_variant	12/26
SCN8A	NM_001369788.1 linkuse as main transcript	c.1819G>A	p.Ala607Thr	missense_variant	12/26

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SCN8A	ENST00000354534.11 linkuse as main transcript	c.1819G>A	p.Ala607Thr	missense_variant	12/27	1	NM_014191.4	P4	Q9UQD0-1
SCN8A	ENST00000627620.5 linkuse as main transcript	c.1819G>A	p.Ala607Thr	missense_variant	12/27	5	NM_001330260.2	A1	Q9UQD0-2

Frequencies

GnomAD3 genomes

AF:

0.000572

AC:

AN:

152174

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00176

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000785

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:

0.000957

GnomAD3 exomes

AF:

0.000133

AC:

AN:

210124

Hom.:

AF XY:

0.0000870

AC XY:

AN XY:

114916

show subpopulations

Gnomad AFR exome

AF:

0.00189

Gnomad AMR exome

AF:

0.000168

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:

0.000189

GnomAD4 exome

AF:

0.0000561

AC:

AN:

1444264

Hom.:

Cov.:

AF XY:

0.0000474

AC XY:

AN XY:

717090

show subpopulations

Gnomad4 AFR exome

AF:

0.00181

Gnomad4 AMR exome

AF:

0.000147

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:

0.00000181

Gnomad4 OTH exome

AF:

0.000184

GnomAD4 genome

AF:

0.000571

AC:

AN:

152292

Hom.:

Cov.:

AF XY:

0.000618

AC XY:

AN XY:

74462

show subpopulations

Gnomad4 AFR

AF:

0.00176

Gnomad4 AMR

AF:

0.000784

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:

0.000947

Alfa

AF:

0.000133

Hom.:

Bravo

AF:

0.000529

ESP6500AA

AF:

0.000508

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000176

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:7

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:1Benign:4

Benign, criteria provided, single submitter	clinical testing	GeneDx	Aug 30, 2019	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Jun 08, 2018	- -
Likely benign, no assertion criteria provided	clinical testing	Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+	-	- -
Likely benign, no assertion criteria provided	clinical testing	Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center	-	- -
Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Aug 01, 2023	SCN8A: BS1 -

Inborn genetic diseases

Benign:1

Benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 27, 2018

This alteration is classified as benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Early infantile epileptic encephalopathy with suppression bursts

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 19, 2024

- -

SCN8A-related disorder

Benign:1

Likely benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Jan 18, 2021

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.085

BayesDel_addAF

Benign

-0.33

BayesDel_noAF

Benign

-0.25

CADD

Pathogenic

DANN

Uncertain

0.99

DEOGEN2

Benign

0.35

.;T;.;.;.;.;.

Eigen

Benign

-0.22

Eigen_PC

Benign

-0.089

FATHMM_MKL

Benign

0.65

LIST_S2

Uncertain

0.90

D;D;D;.;D;D;D

M_CAP

Benign

0.084

MetaRNN

Benign

0.014

T;T;T;T;T;T;T

MetaSVM

Uncertain

0.090

MutationAssessor

Benign

0.34

.;N;N;N;N;N;.

MutationTaster

Benign

0.54

N;N;N

PrimateAI

Uncertain

0.59

PROVEAN

Benign

-0.20

.;N;N;N;.;.;.

REVEL

Benign

0.20

Sift

Benign

0.36

.;T;T;T;.;.;.

Sift4G

Benign

0.40

.;T;T;T;T;T;T

Polyphen

0.0020, 0.017

.;B;.;.;B;.;.

Vest4

0.27, 0.27, 0.34, 0.38, 0.28

MVP

0.67

MPC

1.0

ClinPred

0.021

GERP RS

3.8

Varity_R

0.14

gMVP

0.55

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