chr2-166073486-C-T

Variant names:

• chr2-166073486-C-T
• rs769582667
• NM_001165963.4:c.136G>A

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 1P and 4B. PP2 BS2

The NM_001165963.4(SCN1A):​c.136G>A​(p.Glu46Lys) variant causes a missense change. The variant allele was found at a frequency of 0.0000378 in 1,614,068 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★). The gene SCN1A is included in the ClinGen Criteria Specification Registry.

• Frequency:
  • Genomes: 𝑓 0.000026 (0 hom., cov: 31)
  • Exomes 𝑓: 0.000039 (0 hom.)
• Consequence: SCN1A NM_001165963.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:5
• Conservation: PhyloP100: 4.78
• Publications: 7 publications found

Genes affected

SCN1A (HGNC:10585): (sodium voltage-gated channel alpha subunit 1) Voltage-dependent sodium channels are heteromeric complexes that regulate sodium exchange between intracellular and extracellular spaces and are essential for the generation and propagation of action potentials in muscle cells and neurons. Each sodium channel is composed of a large pore-forming, glycosylated alpha subunit and two smaller beta subunits. This gene encodes a sodium channel alpha subunit, which has four homologous domains, each of which contains six transmembrane regions. Allelic variants of this gene are associated with generalized epilepsy with febrile seizures and epileptic encephalopathy. Alternative splicing results in multiple transcript variants. The RefSeq Project has decided to create four representative RefSeq records. Three of the transcript variants are supported by experimental evidence and the fourth contains alternate 5' untranslated exons, the exact combination of which have not been experimentally confirmed for the full-length transcript. [provided by RefSeq, Oct 2015]

SCN1A-AS1 (HGNC:54069): (SCN1A and SCN9A antisense RNA 1)

ACMG classification

Specifications for SCN1A are available in the ClinGen Criteria Specification Registry and recommended for reference when assigning criteria.

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PP2: Missense variant in the SCN1A gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 848 curated pathogenic missense variants (we use a threshold of 10). The gene has 89 curated benign missense variants. Gene score misZ: 5.2206 (above the threshold of 3.09). Trascript score misZ: 7.6022 (above the threshold of 3.09). GenCC associations: The gene is linked to generalized epilepsy with febrile seizures plus, type 2, developmental and epileptic encephalopathy, 6A, familial hemiplegic migraine, generalized epilepsy with febrile seizures plus, Lennox-Gastaut syndrome, malignant migrating partial seizures of infancy, Dravet syndrome, myoclonic-astatic epilepsy, familial or sporadic hemiplegic migraine, migraine, familial hemiplegic, 3, genetic developmental and epileptic encephalopathy, arthrogryposis.
• BS2: High AC in GnomAdExome4 at 57 AD,Unknown gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001165963.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SCN1A	NM_001165963.4	MANE Select	c.136G>A	p.Glu46Lys	missense	Exon 4 of 29	NP_001159435.1	P35498-1
	SCN1A	NM_001202435.3		c.136G>A	p.Glu46Lys	missense	Exon 3 of 28	NP_001189364.1	P35498-1
	SCN1A	NM_001353948.2		c.136G>A	p.Glu46Lys	missense	Exon 2 of 27	NP_001340877.1	P35498-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SCN1A	ENST00000674923.1	MANE Select	c.136G>A	p.Glu46Lys	missense	Exon 4 of 29	ENSP00000501589.1	P35498-1
	SCN1A	ENST00000303395.9	TSL:5	c.136G>A	p.Glu46Lys	missense	Exon 3 of 28	ENSP00000303540.4	P35498-1
	SCN1A	ENST00000375405.7	TSL:5	c.136G>A	p.Glu46Lys	missense	Exon 1 of 26	ENSP00000364554.3	P35498-2

Frequencies

GnomAD3 genomes AF: 0.0000263 AC: 4 AN: 152190 Hom.: 0 Cov.: 31

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000654

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: 0.0000294

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000278 AC: 7 AN: 251448 AF XY: 0.0000294

Gnomad AFR exome AF: 0.0000615

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000176

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000390 AC: 57 AN: 1461878 Hom.: 0 Cov.: 31 AF XY: 0.0000413 AC XY: 30 AN XY: 727240

African (AFR) AF: 0.0000299 AC: 1 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.0000252 AC: 1 AN: 39698

South Asian (SAS) AF: 0.000162 AC: 14 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53420

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.0000360 AC: 40 AN: 1111998

Other (OTH) AF: 0.0000166 AC: 1 AN: 60396

GnomAD4 genome AF: 0.0000263 AC: 4 AN: 152190 Hom.: 0 Cov.: 31 AF XY: 0.0000135 AC XY: 1 AN XY: 74338

African (AFR) AF: 0.0000241 AC: 1 AN: 41444

American (AMR) AF: 0.0000654 AC: 1 AN: 15280

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5192

South Asian (SAS) AF: 0.00 AC: 0 AN: 4828

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10616

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.0000294 AC: 2 AN: 68038

Other (OTH) AF: 0.00 AC: 0 AN: 2092

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.0000378

ExAC AF: 0.0000494 AC: 6

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	1	-	Developmental and epileptic encephalopathy (1)
-	1	-	Generalized epilepsy with febrile seizures plus, type 2 (1)
-	1	-	not provided (1)
-	1	-	not specified (1)
-	1	-	Severe myoclonic epilepsy in infancy;C1858673:Generalized epilepsy with febrile seizures plus, type 2;C1864987:Migraine, familial hemiplegic, 3 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Pathogenic	0.17	D
BayesDel_noAF	Pathogenic	0.26
CADD	Uncertain	26
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.78	D
Eigen	Uncertain	0.54
Eigen_PC	Uncertain	0.57
FATHMM_MKL	Uncertain	0.88	D
LIST_S2	Uncertain	0.94	D
M_CAP	Uncertain	0.098	D
MetaRNN	Uncertain	0.58	D
MetaSVM	Pathogenic	0.89	D
MutationAssessor	Pathogenic	3.0	M
PhyloP100		4.8
PrimateAI	Uncertain	0.63	T
PROVEAN	Uncertain	-2.7	D
REVEL	Pathogenic	0.68
Sift	Uncertain	0.0030	D
Sift4G	Benign	0.069	T
Polyphen		0.94	P
Vest4		0.55
MutPred		0.35		Gain of methylation at E46 (P = 0.0141)
MVP		0.97
MPC		0.98
ClinPred		0.34	T
GERP RS		5.1
PromoterAI		0.016	Neutral
Varity_R		0.30
gMVP		0.75
Mutation Taster		=14/86	disease causing

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

Other links and lift over

dbSNP: rs769582667; hg19: chr2-166929996; COSMIC: COSV57660030; COSMIC: COSV57660030;