Genetic Variant SCN2A:p.Cys742Phe (chr2-165331405-G-T) – ACMG Classification: Likely_pathogenic (7 pts)

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM1PM2PP2PP3_Moderate

The NM_001040142.2(SCN2A):c.2225G>T(p.Cys742Phe) variant causes a missense change. The variant allele was found at a frequency of 0.00000657 in 152,208 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Consequence

SCN2A
NM_001040142.2 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 6.81

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 Likely_pathogenic. Variant got 7 ACMG points.

PM1

In a repeat II (size 272) in uniprot entity SCN2A_HUMAN there are 22 pathogenic changes around while only 1 benign (96%) in NM_001040142.2

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, 0.864

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SCN2A	NM_001040142.2 link	c.2225G>T	p.Cys742Phe	missense_variant	Exon 14 of 27	ENST00000375437.7	NP_001035232.1	Q99250-1
SCN2A	NM_001371246.1 link	c.2225G>T	p.Cys742Phe	missense_variant	Exon 14 of 27	ENST00000631182.3	NP_001358175.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
SCN2A	ENST00000375437.7 link	c.2225G>T	p.Cys742Phe	missense_variant	Exon 14 of 27	5	NM_001040142.2	ENSP00000364586.2	Q99250-1
SCN2A	ENST00000631182.3 link	c.2225G>T	p.Cys742Phe	missense_variant	Exon 14 of 27	5	NM_001371246.1	ENSP00000486885.1	Q99250-2
SCN2A	ENST00000283256.10 link	c.2225G>T	p.Cys742Phe	missense_variant	Exon 14 of 27	1		ENSP00000283256.6	Q99250-1

Frequencies

GnomAD3 genomes

AF:

0.00000658

AC:

AN:

152090

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

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:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD4 exome

Cov.:

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152208

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74438

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.22

BayesDel_addAF

Pathogenic

0.48

BayesDel_noAF

Pathogenic

0.45

CADD

Uncertain

DANN

Uncertain

0.98

DEOGEN2

Pathogenic

0.87

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

Eigen

Uncertain

0.36

Eigen_PC

Uncertain

0.47

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Uncertain

0.86

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

M_CAP

Pathogenic

0.45

MetaRNN

Pathogenic

0.86

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

MetaSVM

Pathogenic

0.85

MutationAssessor

Pathogenic

3.1

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

PrimateAI

Uncertain

0.79

PROVEAN

Pathogenic

-4.4

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

REVEL

Pathogenic

0.80

Sift

Uncertain

0.0050

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

Sift4G

Uncertain

0.020

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

Polyphen

0.010

B;B;.;B;B;B;B

Vest4

0.72

MutPred

0.53

Gain of MoRF binding (P = 0.0643);Gain of MoRF binding (P = 0.0643);.;Gain of MoRF binding (P = 0.0643);Gain of MoRF binding (P = 0.0643);Gain of MoRF binding (P = 0.0643);Gain of MoRF binding (P = 0.0643);

MVP

0.93

ClinPred

1.0

GERP RS

5.5

Varity_R

0.65

gMVP

0.98

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.21

Details are displayed if max score is > 0.2

DS_AG_spliceai

0.21

Position offset: 17

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

Publications

No publications associated with this variant yet.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over