chr2-165323345-C-T
Variant summary
Our verdict is Likely benign. Variant got -1 ACMG points: 3P and 4B. PP2PP3_ModerateBS2
The NM_001040142.2(SCN2A):c.1861C>T(p.Arg621Cys) variant causes a missense change. The variant allele was found at a frequency of 0.0000041 in 1,461,878 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R621S) has been classified as Uncertain significance.
Frequency
Consequence
NM_001040142.2 missense
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Likely_benign. Variant got -1 ACMG points.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
SCN2A | NM_001040142.2 | c.1861C>T | p.Arg621Cys | missense_variant | 12/27 | ENST00000375437.7 | |
SCN2A | NM_001371246.1 | c.1861C>T | p.Arg621Cys | missense_variant | 12/27 | ENST00000631182.3 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
SCN2A | ENST00000375437.7 | c.1861C>T | p.Arg621Cys | missense_variant | 12/27 | 5 | NM_001040142.2 | P1 | |
SCN2A | ENST00000631182.3 | c.1861C>T | p.Arg621Cys | missense_variant | 12/27 | 5 | NM_001371246.1 |
Frequencies
GnomAD3 genomes Cov.: 32
GnomAD3 exomes AF: 0.00000398 AC: 1AN: 250956Hom.: 0 AF XY: 0.00 AC XY: 0AN XY: 135664
GnomAD4 exome AF: 0.00000410 AC: 6AN: 1461878Hom.: 0 Cov.: 32 AF XY: 0.00000413 AC XY: 3AN XY: 727240
GnomAD4 genome Cov.: 32
ClinVar
Submissions by phenotype
Seizures, benign familial infantile, 3;C3150987:Developmental and epileptic encephalopathy, 11 Uncertain:2
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Oct 18, 2022 | 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. 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 SCN2A protein function. ClinVar contains an entry for this variant (Variation ID: 207092). This missense change has been observed in individual(s) with Lennox-Gastaut syndrome (Invitae). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This sequence change replaces arginine, which is basic and polar, with cysteine, which is neutral and slightly polar, at codon 621 of the SCN2A protein (p.Arg621Cys). - |
Uncertain significance, criteria provided, single submitter | clinical testing | Fulgent Genetics, Fulgent Genetics | Oct 31, 2018 | - - |
not provided Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | GeneDx | Aug 23, 2013 | The R621C variant has not been published as a mutation, nor has it been reported as a benign polymorphism to our knowledge. It was not observed in approximately 6,500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. The R621C 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. This substitution alters a highly conserved position in the cytoplasmic loop between the first and second homologous domains of the SCN2A protein (Shi et al., 2012), and in silico analysis predicts this variant is probably damaging to the protein structure/function. The variant is found in SCN2A panel(s). - |
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at