rs587780455
Variant summary
Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM1PM2PP2PP3PP5
The NM_014191.4(SCN8A):c.5630A>G(p.Asn1877Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).
Frequency
Genomes: not found (cov: 32)
Consequence
SCN8A
NM_014191.4 missense
NM_014191.4 missense
Scores
11
6
2
Clinical Significance
Conservation
PhyloP100: 9.32
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]
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ACMG classification
Classification made for transcript
Verdict is Likely_pathogenic. Variant got 7 ACMG points.
PM1
?
In a hotspot region, there are 6 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 11 uncertain in NM_014191.4
PM2
?
Very rare variant in population databases, with high coverage;
PP2
?
Missense variant where missense usually causes diseases, SCN8A
PP3
?
MetaRNN computational evidence supports a deleterious effect, 0.839
PP5
?
Variant 12-51807116-A-G is Pathogenic according to our data. Variant chr12-51807116-A-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 130252.We mark this variant Likely_pathogenic, oryginal submissions are: {Uncertain_significance=2, Pathogenic=6, Likely_pathogenic=2, not_provided=1}.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
SCN8A | NM_001330260.2 | c.5630A>G | p.Asn1877Ser | missense_variant | 27/27 | ENST00000627620.5 | |
SCN8A | NM_014191.4 | c.5630A>G | p.Asn1877Ser | missense_variant | 27/27 | ENST00000354534.11 | |
SCN8A | NM_001177984.3 | c.5507A>G | p.Asn1836Ser | missense_variant | 26/26 | ||
SCN8A | NM_001369788.1 | c.5507A>G | p.Asn1836Ser | missense_variant | 26/26 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
SCN8A | ENST00000354534.11 | c.5630A>G | p.Asn1877Ser | missense_variant | 27/27 | 1 | NM_014191.4 | P4 | |
SCN8A | ENST00000627620.5 | c.5630A>G | p.Asn1877Ser | missense_variant | 27/27 | 5 | NM_001330260.2 | A1 |
Frequencies
GnomAD3 genomes ? Cov.: 32
GnomAD3 genomes
?
Cov.:
32
GnomAD4 exome Cov.: 33
GnomAD4 exome
Cov.:
33
GnomAD4 genome ? Cov.: 32
GnomAD4 genome
?
Cov.:
32
EpiCase
AF:
EpiControl
AF:
ClinVar
Significance: Conflicting classifications of pathogenicity
Submissions summary: Pathogenic:12Uncertain:2Other:1
Revision: criteria provided, conflicting classifications
LINK: link
Submissions by phenotype
not provided Pathogenic:3Uncertain:2
Uncertain significance, criteria provided, single submitter | clinical testing | Eurofins Ntd Llc (ga) | Jan 12, 2016 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | Revvity Omics, Revvity | Feb 06, 2019 | - - |
Uncertain significance, criteria provided, single submitter | clinical testing | Genetic Services Laboratory, University of Chicago | Dec 06, 2013 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | GeneDx | Mar 25, 2021 | Not observed in large population cohorts (Lek et al., 2016); The majority of missense variants in this gene are considered pathogenic (Stenson et al., 2014); In silico analysis, which includes protein predictors and evolutionary conservation, supports a deleterious effect; This substitution is predicted to be within the C-terminal cytoplasmic domain; This variant is associated with the following publications: (PMID: 29100083, 27210545, 30851583, 31164858, 32090326, 27875746, 27864847, 28923014, 30776697, 31487502, 32853054, 32040247) - |
Pathogenic, criteria provided, single submitter | clinical testing | CeGaT Center for Human Genetics Tuebingen | Feb 01, 2022 | - - |
Seizures, benign familial infantile, 5 Pathogenic:3
Pathogenic, criteria provided, single submitter | clinical testing | Génétique des Maladies du Développement, Hospices Civils de Lyon | Dec 16, 2020 | Absent from gnomAD. Predicted pathogenic. Genotype/phenotype correlation - |
Pathogenic, no assertion criteria provided | literature only | OMIM | Oct 19, 2020 | - - |
Pathogenic, criteria provided, single submitter | research | University of British Columbia, BC Children's Hospital | Aug 30, 2023 | - - |
Developmental and epileptic encephalopathy, 13 Pathogenic:3
Pathogenic, no assertion criteria provided | literature only | OMIM | Oct 19, 2020 | - - |
Likely pathogenic, no assertion criteria provided | clinical testing | Centre de Biologie Pathologie Génétique, Centre Hospitalier Universitaire de Lille | Jan 01, 2019 | - - |
Likely pathogenic, criteria provided, single submitter | clinical testing | Mendelics | May 28, 2019 | - - |
Early infantile epileptic encephalopathy with suppression bursts Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Invitae | Jul 12, 2023 | This missense change has been observed in individual(s) with early onset focal epileptic seizures without cognitive or neurological impairment (PMID: 27210545; Invitae). In at least one individual the variant was observed to be de novo. It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 130252). 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 expected to disrupt SCN8A protein function. For these reasons, this variant has been classified as Pathogenic. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces asparagine, which is neutral and polar, with serine, which is neutral and polar, at codon 1877 of the SCN8A protein (p.Asn1877Ser). - |
Focal epilepsy Pathogenic:1
Likely pathogenic, criteria provided, single submitter | clinical testing | Neurogenetics Laboratory - MEYER, AOU Meyer | Nov 16, 2016 | - - |
Seizure Pathogenic:1
Pathogenic, no assertion criteria provided | clinical testing | Diagnostic Laboratory, Strasbourg University Hospital | - | - - |
Complex neurodevelopmental disorder Other:1
not provided, no classification provided | literature only | Channelopathy-Associated Epilepsy Research Center | - | - - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Pathogenic
BayesDel_addAF
Uncertain
D
BayesDel_noAF
Uncertain
Cadd
Uncertain
Dann
Uncertain
DEOGEN2
Pathogenic
D;.;.;.;.
Eigen
Pathogenic
Eigen_PC
Pathogenic
FATHMM_MKL
Pathogenic
D
LIST_S2
Uncertain
D;D;.;D;D
M_CAP
Pathogenic
D
MetaRNN
Pathogenic
D;D;D;D;D
MetaSVM
Pathogenic
D
MutationAssessor
Uncertain
M;.;.;.;M
MutationTaster
Benign
D;D
PrimateAI
Uncertain
T
PROVEAN
Pathogenic
D;D;.;.;.
REVEL
Pathogenic
Sift
Pathogenic
D;D;.;.;.
Sift4G
Benign
T;T;T;T;T
Polyphen
D;.;.;.;.
Vest4
MutPred
Gain of phosphorylation at N1877 (P = 0.0293);.;.;.;Gain of phosphorylation at N1877 (P = 0.0293);
MVP
MPC
ClinPred
D
GERP RS
Varity_R
gMVP
Splicing
Name
Calibrated prediction
Score
Prediction
SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at