rs121917919
Variant summary
Our verdict is Pathogenic. Variant got 19 ACMG points: 19P and 0B. PM1PM2PM5PP2PP3_StrongPP5_Very_Strong
The NM_001165963.4(SCN1A):c.4762T>C(p.Cys1588Arg) 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. 12/20 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. C1588Y) has been classified as Likely pathogenic.
Frequency
Consequence
NM_001165963.4 missense
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Pathogenic. Variant got 19 ACMG points.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
SCN1A | NM_001165963.4 | c.4762T>C | p.Cys1588Arg | missense_variant | 28/29 | ENST00000674923.1 | |
LOC102724058 | NR_110598.1 | n.176-21377A>G | intron_variant, non_coding_transcript_variant |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
SCN1A | ENST00000674923.1 | c.4762T>C | p.Cys1588Arg | missense_variant | 28/29 | NM_001165963.4 | P4 | ||
SCN1A-AS1 | ENST00000651574.1 | n.193-21377A>G | intron_variant, non_coding_transcript_variant |
Frequencies
GnomAD3 genomes ? Cov.: 32
GnomAD4 exome Cov.: 31
GnomAD4 genome ? Cov.: 32
ClinVar
Submissions by phenotype
Early infantile epileptic encephalopathy with suppression bursts Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Invitae | Feb 24, 2022 | For these reasons, this variant has been classified as Pathogenic. 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 SCN1A protein function. ClinVar contains an entry for this variant (Variation ID: 68552). This missense change has been observed in individual(s) with SCN1A-related conditions (PMID: 17561957, 25818041). In at least one individual the variant was observed to be de novo. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces cysteine, which is neutral and slightly polar, with arginine, which is basic and polar, at codon 1588 of the SCN1A protein (p.Cys1588Arg). - |
not provided Pathogenic:1
Likely pathogenic, criteria provided, single submitter | clinical testing | GeneDx | Dec 21, 2016 | p.Cys1588Arg (TGT>CGT): c.4762 T>C in exon 25 of the SCN1A gene (NM_001165963.1) A C1588R variant that is likely pathogenic has been identified in the SCN1A gene. The C1588R variant has been reported previously as a de novo variant in a patient with Dravet syndrome (Marini et al., 2007). The C1588R variant is not observed in large population cohorts (Lek et al., 2016; 1000 Genomes Consortium et al., 2015; Exome Variant Server). The C1588R variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. Additionally, this substitution alters a conserved position that is predicted to be within the transmembrane segment S2 of the fourth homologous domain, and in silico analysis predicts this variant is probably damaging to the protein structure/function. Furthermore, missense variants in nearby residues (G1586E, V1589G) have been reported in the Human Gene Mutation Database in association with SCN1A-related disorders (Stenson et al., 2014). Therefore, this variant is likely pathogenic; however, the possibility that it is benign cannot be excluded. - |
Severe myoclonic epilepsy in infancy Other:1
not provided, no classification provided | literature only | UniProtKB/Swiss-Prot | - | - - |
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at