NM_001040142.2:c.3734C>T

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2PP2PP3_Moderate

The NM_001040142.2(SCN2A):c.3734C>T(p.Ala1245Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,760 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 12/21 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

SCN2A
NM_001040142.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 7.91

Variant links:

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]

SCN2A links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 5 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

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, 0.893

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SCN2A	NM_001040142.2 link	c.3734C>T	p.Ala1245Val	missense_variant	Exon 20 of 27	ENST00000375437.7	NP_001035232.1	Q99250-1
SCN2A	NM_001371246.1 link	c.3734C>T	p.Ala1245Val	missense_variant	Exon 20 of 27	ENST00000631182.3	NP_001358175.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
SCN2A	ENST00000375437.7 link	c.3734C>T	p.Ala1245Val	missense_variant	Exon 20 of 27	5	NM_001040142.2	ENSP00000364586.2	Q99250-1
SCN2A	ENST00000631182.3 link	c.3734C>T	p.Ala1245Val	missense_variant	Exon 20 of 27	5	NM_001371246.1	ENSP00000486885.1	Q99250-2
SCN2A	ENST00000283256.10 link	c.3734C>T	p.Ala1245Val	missense_variant	Exon 20 of 27	1		ENSP00000283256.6	Q99250-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000398

AC:

AN:

251224

Hom.:

AF XY:

0.00000737

AC XY:

AN XY:

135768

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000881

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000137

AC:

AN:

1461760

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

727194

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000180

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ExAC

AF:

0.00000824

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Apr 25, 2016

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

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

Uncertain:1

Jun 15, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. 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: "Probably Damaging"; Align-GVGD: "Class C0"). ClinVar contains an entry for this variant (Variation ID: 521077). This variant has not been reported in the literature in individuals affected with SCN2A-related conditions. This variant is present in population databases (rs768796023, gnomAD 0.0009%). This sequence change replaces alanine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 1245 of the SCN2A protein (p.Ala1245Val). -

Complex neurodevelopmental disorder

Uncertain:1

Feb 18, 2019

GenomeConnect - Simons Searchlight

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: provider interpretation

Submission from Simons Searchlight facilitated by GenomeConnect. Variant interpreted by the Simons Searchlight team most recently on 2019-02-18 and interpreted as Variant of Uncertain significance. Variant was initially reported on 2016-04-05 by GTR ID of laboratory name 61756. The reporting laboratory might also submit to ClinVar. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.65

BayesDel_addAF

Pathogenic

0.54

BayesDel_noAF

Pathogenic

0.54

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Pathogenic

0.95

D;.;T;.;D;D;.

Eigen

Pathogenic

0.87

Eigen_PC

Pathogenic

0.87

FATHMM_MKL

Uncertain

0.96

LIST_S2

Uncertain

0.93

D;.;D;.;.;.;D

M_CAP

Pathogenic

0.56

MetaRNN

Pathogenic

0.89

D;D;D;D;D;D;D

MetaSVM

Pathogenic

1.1

MutationAssessor

Pathogenic

3.0

M;M;.;M;M;M;M

PrimateAI

Pathogenic

0.89

PROVEAN

Uncertain

-3.8

D;.;.;.;.;D;D

REVEL

Pathogenic

0.92

Sift

Pathogenic

0.0

D;.;.;.;.;D;D

Sift4G

Uncertain

0.026

D;.;.;D;.;D;D

Polyphen

1.0

D;D;.;D;D;D;D

Vest4

0.79

MutPred

0.63

Gain of methylation at K1247 (P = 0.0872);Gain of methylation at K1247 (P = 0.0872);.;Gain of methylation at K1247 (P = 0.0872);Gain of methylation at K1247 (P = 0.0872);Gain of methylation at K1247 (P = 0.0872);Gain of methylation at K1247 (P = 0.0872);

MVP

1.0

ClinPred

0.99

GERP RS

5.8

Varity_R

0.82

gMVP

0.96

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over