rs201718767

Positions:

chr2-165389559-G-A

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 3P and 6B. PM1PP2BP4BS1_SupportingBS2

The NM_001040142.2(SCN2A):c.5753G>A(p.Arg1918His) variant causes a missense change. The variant allele was found at a frequency of 0.0000706 in 1,613,738 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 Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R1918C) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00014 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000063 ( 0 hom. )

Consequence

SCN2A
NM_001040142.2 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:6B:1

Conservation

PhyloP100: 3.93

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:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -3 ACMG points.

PM1

In a topological_domain Cytoplasmic (size 229) in uniprot entity SCN2A_HUMAN there are 30 pathogenic changes around while only 7 benign (81%) in NM_001040142.2

PP2

Missense variant in gene, where missense usually causes diseases (based on misZ statistic), SCN2A. . Trascript score misZ 8.7114 (greater than threshold 3.09). GenCC has associacion of gene with 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.

BP4

Computational evidence support a benign effect (MetaRNN=0.32569957).

BS1

Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.000145 (22/152024) while in subpopulation NFE AF= 0.000279 (19/68022). AF 95% confidence interval is 0.000182. There are 0 homozygotes in gnomad4. There are 7 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

BS2

High AC in GnomAd4 at 22 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SCN2A	NM_001040142.2 linkuse as main transcript	c.5753G>A	p.Arg1918His	missense_variant	27/27	ENST00000375437.7
SCN2A	NM_001371246.1 linkuse as main transcript	c.5753G>A	p.Arg1918His	missense_variant	27/27	ENST00000631182.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SCN2A	ENST00000375437.7 linkuse as main transcript	c.5753G>A	p.Arg1918His	missense_variant	27/27	5	NM_001040142.2	P1	Q99250-1
SCN2A	ENST00000631182.3 linkuse as main transcript	c.5753G>A	p.Arg1918His	missense_variant	27/27	5	NM_001371246.1		Q99250-2

Frequencies

GnomAD3 genomes

AF:

0.000145

AC:

AN:

152024

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000242

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.000189

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000279

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000878

AC:

AN:

250580

Hom.:

AF XY:

0.000111

AC XY:

AN XY:

135414

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000109

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000924

Gnomad NFE exome

AF:

0.000150

Gnomad OTH exome

AF:

0.000164

GnomAD4 exome

AF:

0.0000629

AC:

AN:

1461714

Hom.:

Cov.:

AF XY:

0.0000605

AC XY:

AN XY:

727156

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.000277

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.0000562

Gnomad4 NFE exome

AF:

0.0000657

Gnomad4 OTH exome

AF:

0.0000828

GnomAD4 genome

AF:

0.000145

AC:

AN:

152024

Hom.:

Cov.:

AF XY:

0.0000943

AC XY:

AN XY:

74248

show subpopulations

Gnomad4 AFR

AF:

0.0000242

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.000189

Gnomad4 NFE

AF:

0.000279

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000180

Hom.:

Bravo

AF:

0.000132

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.0000494

AC:

EpiCase

AF:

0.000109

EpiControl

AF:

0.0000593

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:6Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:2Benign:1

Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Feb 18, 2019	This variant is associated with the following publications: (PMID: 30564305, 27262167, 22029951, 11738931) -
Uncertain significance, criteria provided, single submitter	clinical testing	Athena Diagnostics	Apr 24, 2023	Available data are insufficient to determine the clinical significance of the variant at this time. The frequency of this variant in the general population is higher than would generally be expected for pathogenic variants in this gene (http://gnomad.broadinstitute.org). This variant has been identified in at least one individual with clinical features associated with this gene. Assessment of experimental evidence suggests this variant results in abnormal protein function. (PMID: 28087622) Computational tools disagree on the variant's effect on normal protein function. -
Uncertain significance, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Jul 01, 2019	- -

Developmental and epileptic encephalopathy, 11

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Baylor Genetics

Aug 13, 2020

This variant was determined to be of uncertain significance according to ACMG Guidelines, 2015 [PMID:25741868]. -

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 08, 2016

The p.R1918H variant (also known as c.5753G>A), located in coding exon 26 of the SCN2A gene, results from a G to A substitution at nucleotide position 5753. The arginine at codon 1918 is replaced by histidine, an amino acid with highly similar properties. This alteration was detected in one individual with febrile and tonic-clonic seizures; however, it was absent in the individual's niece who had pyknoleptic daily clusters of absence seizures. Of note, the alteration was not detected in three additional unaffected family members or in 92 controls (Haug K et al. Epilepsy Res., 2001 Dec;47:243-6). This amino acid position is well conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Seizures, benign familial infantile, 3;C3150987:Developmental and epileptic encephalopathy, 11;C5394520:Episodic ataxia, type 9

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Center for Genomics, Ann and Robert H. Lurie Children's Hospital of Chicago

Mar 30, 2021

SCN2A NM_001040142.1 exon 27 p.Arg1918His (c.5753G>A): This variant has been reported in the literature in 1 individual with idiopathic generalized epilepsy, but did not segregate with disease in 1 affected family member (Haug 2001 PMID:11738931). This variant is present in 19/125972 European alleles in the Genome Aggregation Database (http://gnomad.broadinstitute.org/rs201718767). Evolutionary conservation and computational predictive tools for this variant are unclear. In summary, data on this variant is insufficient for disease classification. Therefore, the clinical significance of this variant is uncertain. -

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

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Dec 10, 2023

This sequence change replaces arginine, which is basic and polar, with histidine, which is basic and polar, at codon 1918 of the SCN2A protein (p.Arg1918His). This variant is present in population databases (rs201718767, gnomAD 0.02%). This missense change has been observed in individual(s) with childhood absence epilepsy and developmental and epileptic encephalopathy and/or epilepsy of infancy with migrating focal seizures (PMID: 11738931, 33000761, 35715422). ClinVar contains an entry for this variant (Variation ID: 590198). 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 SCN2A protein function with a negative predictive value of 95%. Experimental studies have shown that this missense change affects SCN2A function (PMID: 28087622). 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.081

BayesDel_addAF

Benign

-0.0098

BayesDel_noAF

Uncertain

0.0

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.87

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

Eigen

Uncertain

0.31

Eigen_PC

Uncertain

0.44

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Uncertain

0.89

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

M_CAP

Benign

0.070

MetaRNN

Benign

0.33

T;T;T;T;T;T;T

MetaSVM

Pathogenic

0.87

MutationAssessor

Uncertain

2.2

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

MutationTaster

Benign

1.0

D;D;D;D

PrimateAI

Benign

0.38

PROVEAN

Benign

-2.2

N;.;.;.;.;N;N

REVEL

Uncertain

0.48

Sift

Benign

0.097

T;.;.;.;.;T;T

Sift4G

Benign

0.061

T;.;.;T;.;T;T

Polyphen

0.75

P;B;.;B;P;P;B

Vest4

0.089

MVP

0.87

ClinPred

0.099

GERP RS

5.9

Varity_R

0.42

gMVP

0.80

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