rs201718767

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 1P and 6B. PP2BP4BS1_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

Publications

14 publications found

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 Gene-Disease associations (from GenCC):

complex neurodevelopmental disorder
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen, Illumina
developmental and epileptic encephalopathy, 11
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae)
intellectual disability
Inheritance: AD Classification: DEFINITIVE Submitted by: G2P
episodic ataxia, type 9
Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
seizures, benign familial infantile, 3
Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics
benign familial infantile epilepsy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
benign familial neonatal-infantile seizures
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
Dravet syndrome
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
genetic developmental and epileptic encephalopathy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
infantile spasms
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
malignant migrating partial seizures of infancy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

SCN2A links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -5 ACMG points.

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 genetic developmental and epileptic encephalopathy, episodic ataxia, type 9, seizures, benign familial infantile, 3, complex neurodevelopmental disorder, benign familial neonatal-infantile seizures, Dravet syndrome, infantile spasms, developmental and epileptic encephalopathy, 11, intellectual disability, benign familial infantile epilepsy, malignant migrating partial seizures of infancy.

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 the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check. 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 rank	MANE	Protein	UniProt
SCN2A	NM_001040142.2 link	c.5753G>A	p.Arg1918His	missense_variant	Exon 27 of 27	ENST00000375437.7	NP_001035232.1	Q99250-1
SCN2A	NM_001371246.1 link	c.5753G>A	p.Arg1918His	missense_variant	Exon 27 of 27	ENST00000631182.3	NP_001358175.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
SCN2A	ENST00000375437.7 link	c.5753G>A	p.Arg1918His	missense_variant	Exon 27 of 27	5	NM_001040142.2	ENSP00000364586.2	Q99250-1
SCN2A	ENST00000631182.3 link	c.5753G>A	p.Arg1918His	missense_variant	Exon 27 of 27	5	NM_001371246.1	ENSP00000486885.1	Q99250-2
SCN2A	ENST00000283256.10 link	c.5753G>A	p.Arg1918His	missense_variant	Exon 27 of 27	1		ENSP00000283256.6	Q99250-1

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

GnomAD2 exomes

AF:

0.0000878

AC:

AN:

250580

AF XY:

0.000111

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 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

African (AFR)

AF:

0.00

AC:

AN:

33464

American (AMR)

AF:

0.00

AC:

AN:

44694

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26128

East Asian (EAS)

AF:

0.000277

AC:

AN:

39686

South Asian (SAS)

AF:

0.00

AC:

AN:

86254

European-Finnish (FIN)

AF:

0.0000562

AC:

AN:

53394

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5762

European-Non Finnish (NFE)

AF:

0.0000657

AC:

AN:

1111948

Other (OTH)

AF:

0.0000828

AC:

AN:

60384

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.472

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000145

AC:

AN:

152024

Hom.:

Cov.:

AF XY:

0.0000943

AC XY:

AN XY:

74248

show subpopulations

African (AFR)

AF:

0.0000242

AC:

AN:

41374

American (AMR)

AF:

0.00

AC:

AN:

15242

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3466

East Asian (EAS)

AF:

0.00

AC:

AN:

5178

South Asian (SAS)

AF:

0.00

AC:

AN:

4824

European-Finnish (FIN)

AF:

0.000189

AC:

AN:

10598

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.000279

AC:

AN:

68022

Other (OTH)

AF:

0.00

AC:

AN:

2092

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.516

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

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

Feb 18, 2019

GeneDx

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant is associated with the following publications: (PMID: 30564305, 27262167, 22029951, 11738931) -

Jul 01, 2019

CeGaT Center for Human Genetics Tuebingen

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Feb 12, 2024

Athena Diagnostics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

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) Assessment of experimental evidence suggests this variant results in abnormal protein function. (PMID: 28087622) -

Developmental and epileptic encephalopathy, 11

Uncertain:1

Aug 13, 2020

Baylor Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

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

Inborn genetic diseases

Uncertain:1

Dec 08, 2016

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

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

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

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

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

Oct 27, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

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). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) 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

(source)

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

PhyloP100

3.9

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

Mutation Taster

=30/70

disease causing

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over