2-165313978-A-T

Variant names:

• chr2-165313978-A-T
• NM_001040142.2:c.1253A>T

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM2 PP2 PP3_Strong PP5

The NM_001040142.2(SCN2A):​c.1253A>T​(p.Asn418Ile) 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 Pathogenic (no stars).

• Frequency: Genomes: not found (cov: 33)
• Consequence: SCN2A NM_001040142.2 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 9.32

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 Likely_pathogenic. Variant got 8 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, 0.961
• PP5: Variant 2-165313978-A-T is Pathogenic according to our data. Variant chr2-165313978-A-T is described in ClinVar as [Pathogenic]. Clinvar id is 1342690.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SCN2A	NM_001040142.2	c.1253A>T	p.Asn418Ile	missense_variant	Exon 10 of 27	ENST00000375437.7	NP_001035232.1
SCN2A	NM_001371246.1	c.1253A>T	p.Asn418Ile	missense_variant	Exon 10 of 27	ENST00000631182.3	NP_001358175.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SCN2A	ENST00000375437.7	c.1253A>T	p.Asn418Ile	missense_variant	Exon 10 of 27	5	NM_001040142.2	ENSP00000364586.2
SCN2A	ENST00000631182.3	c.1253A>T	p.Asn418Ile	missense_variant	Exon 10 of 27	5	NM_001371246.1	ENSP00000486885.1
SCN2A	ENST00000283256.10	c.1253A>T	p.Asn418Ile	missense_variant	Exon 10 of 27	1		ENSP00000283256.6
SCN2A	ENST00000424833.5	c.1253A>T	p.Asn418Ile	missense_variant	Exon 10 of 11	1		ENSP00000406454.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Early infantile epileptic encephalopathy with suppression bursts Pathogenic:1

Feb 16, 2022

Neurology Department, Shenzhen Children's Hospital

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.98
BayesDel_addAF	Pathogenic	0.43	D
BayesDel_noAF	Pathogenic	0.38
CADD	Uncertain	26
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.99	.;D;.;T;.;D;D;.
Eigen	Pathogenic	1.0
Eigen_PC	Pathogenic	0.88
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.92	D;D;.;D;.;.;.;D
M_CAP	Pathogenic	0.92	D
MetaRNN	Pathogenic	0.96	D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	0.97	D
MutationAssessor	Pathogenic	5.1	.;H;H;.;H;H;H;H
PrimateAI	Pathogenic	0.83	D
PROVEAN	Pathogenic	-8.7	D;D;.;.;.;.;D;D
REVEL	Pathogenic	0.91
Sift	Pathogenic	0.0	D;D;.;.;.;.;D;D
Sift4G	Pathogenic	0.0	D;D;.;.;D;.;D;D
Polyphen		1.0	.;D;D;.;D;D;D;D
Vest4		0.96, 0.97, 0.96, 0.96
MutPred		0.76		Gain of catalytic residue at L419 (P = 0.355);Gain of catalytic residue at L419 (P = 0.355);Gain of catalytic residue at L419 (P = 0.355);.;Gain of catalytic residue at L419 (P = 0.355);Gain of catalytic residue at L419 (P = 0.355);Gain of catalytic residue at L419 (P = 0.355);Gain of catalytic residue at L419 (P = 0.355);
MVP		0.99
ClinPred		1.0	D
GERP RS		5.8
Varity_R		0.94
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

No publications associated with this variant yet.

Other links and lift over

hg19: chr2-166170488;