chr12-51721729-G-A
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Variant summary
Our verdict is Benign. Variant got -12 ACMG points: 1P and 13B. PP2BP4_StrongBP6BS1BS2
The NM_001330260.2(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).
Frequency
Genomes: 𝑓 0.00057 ( 0 hom., cov: 31)
Exomes 𝑓: 0.000056 ( 1 hom. )
Consequence
SCN8A
NM_001330260.2 missense
NM_001330260.2 missense
Scores
4
15
Clinical Significance
Conservation
PhyloP100: 3.64
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 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: 10.436 (greater than threshold 3.09). The gene has 213 curated pathogenic missense variants (we use a threshold of 10). The gene has 45 curated benign missense variants. GenCC has associacion of the 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: {Uncertain_significance=1, Likely_benign=2, 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 | Protein | UniProt |
---|---|---|---|---|---|---|---|---|
SCN8A | NM_001330260.2 | c.1819G>A | p.Ala607Thr | missense_variant | 12/27 | ENST00000627620.5 | NP_001317189.1 | |
SCN8A | NM_014191.4 | c.1819G>A | p.Ala607Thr | missense_variant | 12/27 | ENST00000354534.11 | NP_055006.1 | |
SCN8A | NM_001177984.3 | c.1819G>A | p.Ala607Thr | missense_variant | 12/26 | NP_001171455.1 | ||
SCN8A | NM_001369788.1 | c.1819G>A | p.Ala607Thr | missense_variant | 12/26 | NP_001356717.1 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Protein | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|---|
SCN8A | ENST00000354534.11 | c.1819G>A | p.Ala607Thr | missense_variant | 12/27 | 1 | NM_014191.4 | ENSP00000346534.4 | ||
SCN8A | ENST00000627620.5 | c.1819G>A | p.Ala607Thr | missense_variant | 12/27 | 5 | NM_001330260.2 | ENSP00000487583.2 | ||
SCN8A | ENST00000599343.5 | c.1819G>A | p.Ala607Thr | missense_variant | 11/26 | 5 | ENSP00000476447.3 | |||
SCN8A | ENST00000355133.7 | c.1819G>A | p.Ala607Thr | missense_variant | 11/25 | 1 | ENSP00000347255.4 |
Frequencies
GnomAD3 genomes AF: 0.000572 AC: 87AN: 152174Hom.: 0 Cov.: 31
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GnomAD3 exomes AF: 0.000133 AC: 28AN: 210124Hom.: 0 AF XY: 0.0000870 AC XY: 10AN XY: 114916
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GnomAD4 exome AF: 0.0000561 AC: 81AN: 1444264Hom.: 1 Cov.: 31 AF XY: 0.0000474 AC XY: 34AN XY: 717090
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GnomAD4 genome AF: 0.000571 AC: 87AN: 152292Hom.: 0 Cov.: 31 AF XY: 0.000618 AC XY: 46AN XY: 74462
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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
Likely benign, criteria provided, single submitter | clinical testing | CeGaT Center for Human Genetics Tuebingen | Aug 01, 2023 | SCN8A: BS1 - |
Uncertain significance, criteria provided, single submitter | clinical testing | Eurofins Ntd Llc (ga) | Jun 08, 2018 | - - |
Benign, criteria provided, single submitter | clinical testing | GeneDx | Aug 30, 2019 | - - |
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 | - | - - |
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:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Benign
BayesDel_addAF
Benign
T
BayesDel_noAF
Benign
CADD
Pathogenic
DANN
Uncertain
DEOGEN2
Benign
.;T;.;.;.;.;.
Eigen
Benign
Eigen_PC
Benign
FATHMM_MKL
Benign
D
LIST_S2
Uncertain
D;D;D;.;D;D;D
M_CAP
Benign
D
MetaRNN
Benign
T;T;T;T;T;T;T
MetaSVM
Uncertain
D
MutationAssessor
Benign
.;N;N;N;N;N;.
PrimateAI
Uncertain
T
PROVEAN
Benign
.;N;N;N;.;.;.
REVEL
Benign
Sift
Benign
.;T;T;T;.;.;.
Sift4G
Benign
.;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
T
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gMVP
Splicing
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SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at