rs1174261819
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Variant summary
Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2BP4
The NM_000334.4(SCN4A):c.1192G>A(p.Ala398Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000126 in 1,591,248 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).
Frequency
Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)
Exomes 𝑓: 6.9e-7 ( 0 hom. )
Consequence
SCN4A
NM_000334.4 missense
NM_000334.4 missense
Scores
9
10
Clinical Significance
Conservation
PhyloP100: -0.108
Genes affected
SCN4A (HGNC:10591): (sodium voltage-gated channel alpha subunit 4) Voltage-gated sodium channels are transmembrane glycoprotein complexes composed of a large alpha subunit with 24 transmembrane domains and one or more regulatory beta subunits. They are responsible for the generation and propagation of action potentials in neurons and muscle. This gene encodes one member of the sodium channel alpha subunit gene family. It is expressed in skeletal muscle, and mutations in this gene have been linked to several myotonia and periodic paralysis disorders. [provided by RefSeq, Jul 2008]
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ACMG classification
Classification made for transcript
Verdict is Uncertain_significance. Variant got 1 ACMG points.
PM2
?
Very rare variant in population databases, with high coverage;
BP4
?
Computational evidence support a benign effect (MetaRNN=0.37740707).
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
SCN4A | NM_000334.4 | c.1192G>A | p.Ala398Thr | missense_variant | 8/24 | ENST00000435607.3 | |
LOC105371858 | XR_001752969.2 | n.346-353C>T | intron_variant, non_coding_transcript_variant | ||||
LOC105371858 | XR_001752970.2 | n.401-353C>T | intron_variant, non_coding_transcript_variant | ||||
LOC105371858 | XR_934910.3 | n.221-353C>T | intron_variant, non_coding_transcript_variant |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
SCN4A | ENST00000435607.3 | c.1192G>A | p.Ala398Thr | missense_variant | 8/24 | 1 | NM_000334.4 | P1 |
Frequencies
GnomAD3 genomes ? AF: 0.00000658 AC: 1AN: 152022Hom.: 0 Cov.: 32
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GnomAD4 exome AF: 6.95e-7 AC: 1AN: 1439226Hom.: 0 Cov.: 33 AF XY: 0.00000140 AC XY: 1AN XY: 713528
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GnomAD4 genome ? AF: 0.00000658 AC: 1AN: 152022Hom.: 0 Cov.: 32 AF XY: 0.0000135 AC XY: 1AN XY: 74252
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ClinVar
Significance: Uncertain significance
Submissions summary: Uncertain:3
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
Hyperkalemic periodic paralysis Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Jan 15, 2024 | This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 398 of the SCN4A protein (p.Ala398Thr). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with SCN4A-related conditions. ClinVar contains an entry for this variant (Variation ID: 477398). 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 not expected to disrupt SCN4A protein function with a negative predictive value of 80%. 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. - |
not provided Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | GeneDx | Oct 15, 2019 | Not observed in large population cohorts (Lek et al., 2016); In silico analysis, which includes protein predictors and evolutionary conservation, supports that this variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge - |
Paramyotonia congenita of Von Eulenburg;C0238357:Hyperkalemic periodic paralysis;C2750061:Hypokalemic periodic paralysis, type 2;C2931826:Potassium-aggravated myotonia;C3280112:Congenital myasthenic syndrome 16;C3714580:Hypokalemic periodic paralysis, type 1 Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Fulgent Genetics, Fulgent Genetics | May 01, 2022 | - - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Uncertain
BayesDel_addAF
Uncertain
T
BayesDel_noAF
Benign
CADD
Benign
DANN
Uncertain
DEOGEN2
Uncertain
D
Eigen
Benign
Eigen_PC
Benign
FATHMM_MKL
Benign
N
LIST_S2
Uncertain
D
M_CAP
Uncertain
D
MetaRNN
Benign
T
MetaSVM
Uncertain
D
MutationAssessor
Benign
N
MutationTaster
Benign
D;D
PrimateAI
Uncertain
T
PROVEAN
Benign
N
REVEL
Uncertain
Sift
Benign
D
Sift4G
Benign
T
Polyphen
P
Vest4
MutPred
Gain of catalytic residue at M403 (P = 0.0901);
MVP
MPC
ClinPred
T
GERP RS
Varity_R
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