rs797045945
Variant summary
Our verdict is Uncertain significance. Variant got 2 ACMG points: 3P and 1B. PM2PP2BP6
The NM_014191.4(SCN8A):c.202A>G(p.Ile68Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 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
3
9
1
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 Uncertain_significance. Variant got 2 ACMG points.
PM2
?
Very rare variant in population databases, with high coverage;
PP2
?
Missense variant where missense usually causes diseases, SCN8A
BP6
?
Variant 12-51663019-A-G is Benign according to our data. Variant chr12-51663019-A-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 212135.We mark this variant Likely_benign, oryginal submissions are: {Uncertain_significance=1, Likely_benign=1}.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
SCN8A | NM_001330260.2 | c.202A>G | p.Ile68Val | missense_variant | 2/27 | ENST00000627620.5 | |
SCN8A | NM_014191.4 | c.202A>G | p.Ile68Val | missense_variant | 2/27 | ENST00000354534.11 | |
SCN8A | NM_001177984.3 | c.202A>G | p.Ile68Val | missense_variant | 2/26 | ||
SCN8A | NM_001369788.1 | c.202A>G | p.Ile68Val | missense_variant | 2/26 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
SCN8A | ENST00000354534.11 | c.202A>G | p.Ile68Val | missense_variant | 2/27 | 1 | NM_014191.4 | P4 | |
SCN8A | ENST00000627620.5 | c.202A>G | p.Ile68Val | missense_variant | 2/27 | 5 | NM_001330260.2 | A1 |
Frequencies
GnomAD3 genomes ? Cov.: 32
GnomAD3 genomes
?
Cov.:
32
GnomAD4 exome Cov.: 31
GnomAD4 exome
Cov.:
31
GnomAD4 genome ? Cov.: 32
GnomAD4 genome
?
Cov.:
32
ClinVar
Significance: Conflicting classifications of pathogenicity
Submissions summary: Uncertain:1Benign:1
Revision: criteria provided, conflicting classifications
LINK: link
Submissions by phenotype
Early infantile epileptic encephalopathy with suppression bursts Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Jul 04, 2021 | 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. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). ClinVar contains an entry for this variant (Variation ID: 212135). This variant has been observed in individual(s) with clinical features of SCN8A-related conditions (PMID: 27875746). This variant is not present in population databases (ExAC no frequency). This sequence change replaces isoleucine with valine at codon 68 of the SCN8A protein (p.Ile68Val). The isoleucine residue is moderately conserved and there is a small physicochemical difference between isoleucine and valine. - |
not specified Benign:1
Likely benign, criteria provided, single submitter | clinical testing | Genetic Services Laboratory, University of Chicago | Dec 24, 2014 | - - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Uncertain
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Uncertain
Cadd
Uncertain
Dann
Uncertain
Eigen
Uncertain
Eigen_PC
Uncertain
FATHMM_MKL
Pathogenic
D
LIST_S2
Uncertain
D;D;D;.;D;D
M_CAP
Pathogenic
D
MetaRNN
Uncertain
D;D;D;D;D;D
MetaSVM
Uncertain
D
MutationTaster
Benign
D;D;D
PrimateAI
Uncertain
T
Polyphen
0.86
.;P;.;.;.;.
Vest4
0.54, 0.52, 0.53, 0.51
MutPred
Loss of helix (P = 0.0237);Loss of helix (P = 0.0237);Loss of helix (P = 0.0237);Loss of helix (P = 0.0237);Loss of helix (P = 0.0237);Loss of helix (P = 0.0237);
MVP
0.94
MPC
1.9
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