2-165326879-A-G

Position:

• chr2-165326879-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP2

The NM_001040142.2(SCN2A):​c.2044A>G​(p.Lys682Glu) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,712 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. K682N) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: SCN2A NM_001040142.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.02

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 Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• 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.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SCN2A	NM_001040142.2	c.2044A>G	p.Lys682Glu	missense_variant	13/27	ENST00000375437.7
SCN2A	NM_001371246.1	c.2044A>G	p.Lys682Glu	missense_variant	13/27	ENST00000631182.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SCN2A	ENST00000375437.7	c.2044A>G	p.Lys682Glu	missense_variant	13/27	5	NM_001040142.2	P1
SCN2A	ENST00000631182.3	c.2044A>G	p.Lys682Glu	missense_variant	13/27	5	NM_001371246.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461712 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 727148

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: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics

Sep 13, 2016

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.43
BayesDel_addAF	Uncertain	0.018	T
BayesDel_noAF	Benign	-0.21
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.67	D;.;T;.;D;D;.
Eigen	Uncertain	0.34
Eigen_PC	Uncertain	0.44
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.93	D;.;D;.;.;.;D
M_CAP	Uncertain	0.091	D
MetaRNN	Uncertain	0.49	T;T;T;T;T;T;T
MetaSVM	Uncertain	0.59	D
MutationAssessor	Uncertain	2.2	M;M;.;M;M;M;M
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Uncertain	0.72	T
PROVEAN	Uncertain	-2.6	D;.;.;.;.;D;D
REVEL	Uncertain	0.44
Sift	Benign	0.045	D;.;.;.;.;D;D
Sift4G	Benign	0.23	T;.;.;T;.;T;T
Polyphen		0.78	P;B;.;B;P;P;B
Vest4		0.34
MutPred		0.45		Loss of ubiquitination at K682 (P = 0.0041);Loss of ubiquitination at K682 (P = 0.0041);.;Loss of ubiquitination at K682 (P = 0.0041);Loss of ubiquitination at K682 (P = 0.0041);Loss of ubiquitination at K682 (P = 0.0041);Loss of ubiquitination at K682 (P = 0.0041);
MVP		0.78
ClinPred		0.94	D
GERP RS		5.8
Varity_R		0.56
gMVP		0.64

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

Other links and lift over

dbSNP: rs1057520113; hg19: chr2-166183389;