rs1057519524

Variant names:

• chr2-165386837-T-C
• rs1057519524
• NM_001040142.2:c.4643T>C

Variant summary

Our verdict is Pathogenic. Variant got 17 ACMG points: 17P and 0B. PM1 PM2 PM5 PP2 PP3_Moderate PP5_Very_Strong

The NM_001040142.2(SCN2A):​c.4643T>C​(p.Met1548Thr) 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. 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. M1548V) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: SCN2A NM_001040142.2 missense
• Clinical Significance: Likely pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: 8.02

Genes affected

SCN2A (HGNC:10588): (sodium voltage-gated channel alpha subunit 2) Voltage-gated sodium channels are transmembrane glycoprotein complexes composed of a large alpha subunit with four repeat domains, each of which is composed of six membrane-spanning segments, and one or more regulatory beta subunits. Voltage-gated sodium channels function in the generation and propagation of action potentials in neurons and muscle. This gene encodes one member of the sodium channel alpha subunit gene family. Allelic variants of this gene are associated with seizure disorders and autism spectrum disorder. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Nov 2016]

ACMG classification

Verdict is Pathogenic. Variant got 17 ACMG points.

• PM1: In a repeat IV (size 298) in uniprot entity SCN2A_HUMAN there are 14 pathogenic changes around while only 0 benign (100%) in NM_001040142.2
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr2-165386836-A-G is described in Lovd as [Pathogenic].
• PP2: Missense variant in the SCN2A gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 362 curated pathogenic missense variants (we use a threshold of 10). The gene has 36 curated benign missense variants. Trascript score misZ: 8.7114 (above the threshold of 3.09). GenCC associations: The gene is linked to seizures, benign familial infantile, 3, Dravet syndrome, benign familial neonatal-infantile seizures, malignant migrating partial seizures of infancy, complex neurodevelopmental disorder, developmental and epileptic encephalopathy, 11, developmental and epileptic encephalopathy, West syndrome, benign familial infantile epilepsy, episodic ataxia, type 9.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.913
• PP5: Variant 2-165386837-T-C is Pathogenic according to our data. Variant chr2-165386837-T-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 375506.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SCN2A	NM_001040142.2	c.4643T>C	p.Met1548Thr	missense_variant	Exon 26 of 27	ENST00000375437.7	NP_001035232.1
SCN2A	NM_001371246.1	c.4643T>C	p.Met1548Thr	missense_variant	Exon 26 of 27	ENST00000631182.3	NP_001358175.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SCN2A	ENST00000375437.7	c.4643T>C	p.Met1548Thr	missense_variant	Exon 26 of 27	5	NM_001040142.2	ENSP00000364586.2
SCN2A	ENST00000631182.3	c.4643T>C	p.Met1548Thr	missense_variant	Exon 26 of 27	5	NM_001371246.1	ENSP00000486885.1
SCN2A	ENST00000283256.10	c.4643T>C	p.Met1548Thr	missense_variant	Exon 26 of 27	1		ENSP00000283256.6

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Seizures, benign familial infantile, 3;C3150987:Developmental and epileptic encephalopathy, 11 Pathogenic:1

Jan 16, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces methionine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 1548 of the SCN2A protein (p.Met1548Thr). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with epileptic encephalopathy (PMID: 27864847). In at least one individual the variant was observed to be de novo. ClinVar contains an entry for this variant (Variation ID: 375506). 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: "Benign"; Align-GVGD: "Class C0"). This variant disrupts the p.Met1548 amino acid residue in SCN2A. Other variant(s) that disrupt this residue have been observed in individuals with SCN2A-related conditions (PMID: 28379373), which suggests that this may be a clinically significant amino acid residue. In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. -

Epileptic encephalopathy Pathogenic:1

Nov 16, 2016

Neurogenetics Laboratory - MEYER, AOU Meyer

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.54	D
BayesDel_noAF	Pathogenic	0.54
CADD	Uncertain	25
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.97	D;.;T;.;D;D;.
Eigen	Pathogenic	0.79
Eigen_PC	Pathogenic	0.74
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Pathogenic	0.98	D;.;D;.;.;.;D
M_CAP	Pathogenic	0.69	D
MetaRNN	Pathogenic	0.91	D;D;D;D;D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	4.7	H;H;.;H;H;H;H
PrimateAI	Pathogenic	0.84	D
PROVEAN	Pathogenic	-5.3	D;.;.;.;.;D;D
REVEL	Pathogenic	0.94
Sift	Uncertain	0.0090	D;.;.;.;.;D;D
Sift4G	Uncertain	0.0030	D;.;.;D;.;D;D
Polyphen		0.43	B;D;.;D;B;B;D
Vest4		0.93
MutPred		0.67		Gain of glycosylation at M1548 (P = 0.0384);Gain of glycosylation at M1548 (P = 0.0384);.;Gain of glycosylation at M1548 (P = 0.0384);Gain of glycosylation at M1548 (P = 0.0384);Gain of glycosylation at M1548 (P = 0.0384);Gain of glycosylation at M1548 (P = 0.0384);
MVP		0.98
ClinPred		1.0	D
GERP RS		5.2
Varity_R		0.91
gMVP		1.0

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs1057519524; hg19: chr2-166243347;