rs201018451

Positions:

chr12-51706504-G-A

Variant summary

Our verdict is Benign. Variant got -19 ACMG points: 1P and 20B. PP2BP4_StrongBP6_Very_StrongBS1BS2

The NM_014191.4(SCN8A):c.1424G>A(p.Arg475Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000679 in 1,605,022 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.00029 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000045 ( 0 hom. )

Consequence

SCN8A
NM_014191.4 missense

Scores

Clinical Significance

Likely benign criteria provided, multiple submitters, no conflicts B:5

Conservation

PhyloP100: 3.08

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 -19 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=0.033465236).

BP6

Variant 12-51706504-G-A is Benign according to our data. Variant chr12-51706504-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 167654.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.000289 (44/152270) while in subpopulation AFR AF= 0.000891 (37/41548). AF 95% confidence interval is 0.000664. There are 0 homozygotes in gnomad4. There are 22 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

BS2

High AC in GnomAd4 at 44 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein
SCN8A	NM_001330260.2 linkuse as main transcript	c.1424G>A	p.Arg475Gln	missense_variant	11/27	ENST00000627620.5	NP_001317189.1
SCN8A	NM_014191.4 linkuse as main transcript	c.1424G>A	p.Arg475Gln	missense_variant	11/27	ENST00000354534.11	NP_055006.1
SCN8A	NM_001177984.3 linkuse as main transcript	c.1424G>A	p.Arg475Gln	missense_variant	11/26		NP_001171455.1
SCN8A	NM_001369788.1 linkuse as main transcript	c.1424G>A	p.Arg475Gln	missense_variant	11/26		NP_001356717.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SCN8A	ENST00000354534.11 linkuse as main transcript	c.1424G>A	p.Arg475Gln	missense_variant	11/27	1	NM_014191.4	ENSP00000346534	P4	Q9UQD0-1
SCN8A	ENST00000627620.5 linkuse as main transcript	c.1424G>A	p.Arg475Gln	missense_variant	11/27	5	NM_001330260.2	ENSP00000487583	A1	Q9UQD0-2

Frequencies

GnomAD3 genomes

AF:

0.000296

AC:

AN:

152152

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000917

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

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:

0.00192

GnomAD3 exomes

AF:

0.0000387

AC:

AN:

232638

Hom.:

AF XY:

0.0000476

AC XY:

AN XY:

125968

show subpopulations

Gnomad AFR exome

AF:

0.000501

Gnomad AMR exome

AF:

0.0000305

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000353

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000447

AC:

AN:

1452752

Hom.:

Cov.:

AF XY:

0.0000443

AC XY:

AN XY:

721708

show subpopulations

Gnomad4 AFR exome

AF:

0.000872

Gnomad4 AMR exome

AF:

0.0000461

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000508

Gnomad4 SAS exome

AF:

0.0000119

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000271

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.000289

AC:

AN:

152270

Hom.:

Cov.:

AF XY:

0.000296

AC XY:

AN XY:

74442

show subpopulations

Gnomad4 AFR

AF:

0.000891

Gnomad4 AMR

AF:

0.000131

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:

0.00190

Alfa

AF:

0.0000480

Hom.:

Bravo

AF:

0.000272

ESP6500AA

AF:

0.000825

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000828

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Likely benign

Submissions summary: Benign:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Eurofins Ntd Llc (ga)

Dec 12, 2014

- -

Inborn genetic diseases

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 22, 2019

This alteration is classified as likely 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

Nov 28, 2023

- -

SCN8A-related disorder

Benign:1

Likely benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Aug 19, 2022

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). -

not provided

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

Feb 21, 2019

This variant is associated with the following publications: (PMID: 33083721) -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.083

BayesDel_addAF

Benign

-0.27

BayesDel_noAF

Benign

-0.21

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Benign

0.27

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

Eigen

Benign

-0.26

Eigen_PC

Benign

-0.058

FATHMM_MKL

Uncertain

0.94

LIST_S2

Benign

0.84

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

M_CAP

Benign

0.046

MetaRNN

Benign

0.033

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

MetaSVM

Uncertain

0.072

MutationAssessor

Benign

1.1

.;L;L;L;L;L;.

MutationTaster

Benign

0.97

D;D;D

PrimateAI

Benign

0.35

PROVEAN

Benign

0.28

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

REVEL

Benign

0.24

Sift

Benign

0.15

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

Sift4G

Benign

0.37

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

Polyphen

0.0010

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

Vest4

0.12, 0.11, 0.12, 0.097

MVP

0.75

MPC

1.1

ClinPred

0.035

GERP RS

4.4

Varity_R

0.065

gMVP

0.33

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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