chr12-51769111-G-A

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -6 ACMG points: 1P and 7B. PP2BP4_ModerateBP6BS2

The NM_001330260.2(SCN8A):c.3148G>A(p.Gly1050Ser) variant causes a missense change. The variant allele was found at a frequency of 0.000108 in 1,613,404 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G1050A) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00017 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00010 ( 1 hom. )

Consequence

SCN8A
NM_001330260.2 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:4

Conservation

PhyloP100: 4.37

Publications

8 publications found

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 Gene-Disease associations (from GenCC):

complex neurodevelopmental disorder
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
developmental and epileptic encephalopathy, 13
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
cognitive impairment with or without cerebellar ataxia
Inheritance: AD Classification: STRONG Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
seizures, benign familial infantile, 5
Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
benign familial infantile epilepsy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
infantile convulsions and choreoathetosis
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
undetermined early-onset epileptic encephalopathy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
myoclonus, familial, 2
Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

SCN8A links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -6 ACMG points.

PP2

Missense variant in the SCN8A gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 213 curated pathogenic missense variants (we use a threshold of 10). The gene has 45 curated benign missense variants. Gene score misZ: 0.78755 (below the threshold of 3.09). Trascript score misZ: 10.436 (above the threshold of 3.09). GenCC associations: The gene is linked to myoclonus, familial, 2, developmental and epileptic encephalopathy, 13, undetermined early-onset epileptic encephalopathy, benign familial infantile epilepsy, complex neurodevelopmental disorder, seizures, benign familial infantile, 5, cognitive impairment with or without cerebellar ataxia, infantile convulsions and choreoathetosis.

BP4

Computational evidence support a benign effect (MetaRNN=0.18225342).

BP6

Variant 12-51769111-G-A is Benign according to our data. Variant chr12-51769111-G-A is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 207142. Variant chr12-51769111-G-A is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 207142. Variant chr12-51769111-G-A is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 207142. Variant chr12-51769111-G-A is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 207142. Variant chr12-51769111-G-A is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 207142. Variant chr12-51769111-G-A is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 207142. Variant chr12-51769111-G-A is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 207142. Variant chr12-51769111-G-A is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 207142. Variant chr12-51769111-G-A is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 207142. Variant chr12-51769111-G-A is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 207142. Variant chr12-51769111-G-A is described in CliVar as Conflicting_classifications_of_pathogenicity. Clinvar id is 207142.

BS2

High AC in GnomAd4 at 26 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SCN8A	NM_001330260.2 link	c.3148G>A	p.Gly1050Ser	missense_variant	Exon 17 of 27	ENST00000627620.5	NP_001317189.1	Q9UQD0-2Q6B4S4
SCN8A	NM_014191.4 link	c.3148G>A	p.Gly1050Ser	missense_variant	Exon 17 of 27	ENST00000354534.11	NP_055006.1	Q9UQD0-1
SCN8A	NM_001177984.3 link	c.3148G>A	p.Gly1050Ser	missense_variant	Exon 17 of 26		NP_001171455.1	Q9UQD0-5
SCN8A	NM_001369788.1 link	c.3148G>A	p.Gly1050Ser	missense_variant	Exon 17 of 26		NP_001356717.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
SCN8A	ENST00000354534.11 link	c.3148G>A	p.Gly1050Ser	missense_variant	Exon 17 of 27	1	NM_014191.4	ENSP00000346534.4	Q9UQD0-1
SCN8A	ENST00000627620.5 link	c.3148G>A	p.Gly1050Ser	missense_variant	Exon 17 of 27	5	NM_001330260.2	ENSP00000487583.2	Q9UQD0-2
SCN8A	ENST00000599343.5 link	c.3181G>A	p.Gly1061Ser	missense_variant	Exon 16 of 26	5		ENSP00000476447.3	Q9UQD0-3
SCN8A	ENST00000355133.7 link	c.3148G>A	p.Gly1050Ser	missense_variant	Exon 16 of 25	1		ENSP00000347255.4	Q9UQD0-5

Frequencies

GnomAD3 genomes

AF:

0.000171

AC:

AN:

152168

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000121

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000262

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:

0.000250

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000808

AC:

AN:

247622

AF XY:

0.0000670

show subpopulations

Gnomad AFR exome

AF:

0.0000651

Gnomad AMR exome

AF:

0.0000874

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000561

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000125

Gnomad OTH exome

AF:

0.000166

GnomAD4 exome

AF:

0.000101

AC:

148

AN:

1461118

Hom.:

Cov.:

AF XY:

0.0000853

AC XY:

AN XY:

726786

show subpopulations

African (AFR)

AF:

0.000120

AC:

AN:

33470

American (AMR)

AF:

0.000157

AC:

AN:

44614

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26114

East Asian (EAS)

AF:

0.0000252

AC:

AN:

39668

South Asian (SAS)

AF:

0.00

AC:

AN:

86126

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53380

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5766

European-Non Finnish (NFE)

AF:

0.000120

AC:

133

AN:

1111624

Other (OTH)

AF:

0.0000497

AC:

AN:

60356

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.490

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000171

AC:

AN:

152286

Hom.:

Cov.:

AF XY:

0.000175

AC XY:

AN XY:

74462

show subpopulations

African (AFR)

AF:

0.000120

AC:

AN:

41554

American (AMR)

AF:

0.000261

AC:

AN:

15304

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5188

South Asian (SAS)

AF:

0.00

AC:

AN:

4822

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10604

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000250

AC:

AN:

68022

Other (OTH)

AF:

0.00

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.502

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000128

Hom.:

Bravo

AF:

0.000155

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000234

AC:

ExAC

AF:

0.0000825

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:4

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:2Benign:1

Jan 21, 2019

GeneDx

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant is associated with the following publications: (PMID: 27875746, 25666757) -

May 12, 2017

Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

May 01, 2023

CeGaT Center for Human Genetics Tuebingen

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

SCN8A: PP2 -

Seizures, benign familial infantile, 5

Uncertain:1

Mar 05, 2021

New York Genome Center

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The inherited heterozygous c.3148G>A (p.Gly1050Ser) variant identified in the SCN8A gene has been reported in the literature as de novo in a patient affected with hemiplegic cerebral palsy and intellectual disability [2]. The variant has been reported in ClinVar database with conflicting interpretations of pathogenicity [benign (1), likely benign (1), uncertain significance (2). Variation ID:207142]. The variant has 0.0001709 allele frequency in the gnomAD(v3) database (26 out of 152168 heterozygous alleles, no homozygotes) suggesting it is not a common benign variant in the populations represented in that database. The affected residue is evolutionarily conserved and is predicted deleterious by in silico predictiontools [CADD score= 22.5, REVEL score = 0.828]. Based on the available evidence, the inherited heterozygous c.3148G>A (p.Gly1050Ser) variant identified in the SCN8A gene is reported as a variant of uncertainsignificance. -

Inborn genetic diseases

Benign:1

Oct 12, 2017

Ambry Genetics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

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. -

Developmental and epileptic encephalopathy

Benign:1

Jan 27, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

SCN8A-related disorder

Benign:1

Jan 04, 2022

PreventionGenetics, part of Exact Sciences

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

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

0.16

BayesDel_addAF

Uncertain

0.047

BayesDel_noAF

Uncertain

0.060

CADD

Pathogenic

(source)

DANN

Benign

0.96

DEOGEN2

Benign

0.25

T;.;.;.;.

Eigen

Benign

0.0041

Eigen_PC

Benign

0.13

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.91

D;D;.;D;D

M_CAP

Uncertain

0.23

MetaRNN

Benign

0.18

T;T;T;T;T

MetaSVM

Uncertain

0.33

MutationAssessor

Benign

1.4

L;L;L;.;L

PhyloP100

4.4

PrimateAI

Uncertain

0.72

PROVEAN

Benign

-0.13

N;N;N;.;.

REVEL

Pathogenic

0.83

Sift

Benign

0.70

T;T;T;.;.

Sift4G

Benign

0.83

T;T;T;T;T

Polyphen

0.64

P;.;.;.;.

Vest4

0.42

MVP

0.87

MPC

1.6

ClinPred

0.044

GERP RS

4.5

Varity_R

0.073

gMVP

0.72

Mutation Taster

=9/91

disease causing

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over