NM_001165963.4:c.1790C>A

Variant names:

• chr2-166043922-G-T
• rs149715258
• NM_001165963.4:c.1790C>A

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 3P and 6B. PM1 PP2 BP4 BP6 BS2

The NM_001165963.4(SCN1A):​c.1790C>A​(p.Thr597Asn) variant causes a missense change. The variant allele was found at a frequency of 0.0000359 in 1,614,148 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). The gene SCN1A is included in the ClinGen Criteria Specification Registry.

• Frequency:
  • Genomes: 𝑓 0.00013 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000026 (0 hom.)
• Consequence: SCN1A NM_001165963.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2 B:3
• Conservation: PhyloP100: 5.71
• Publications: 4 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.

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 2 benign, 16 uncertain in NM_001165963.4
• 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.
• BP4: Computational evidence support a benign effect (MetaRNN=0.39912024).
• BP6: Variant 2-166043922-G-T is Benign according to our data. Variant chr2-166043922-G-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 206774.
• BS2: High AC in GnomAd4 at 20 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.1790C>A	p.Thr597Asn	missense	Exon 14 of 29	NP_001159435.1	P35498-1
	SCN1A	NM_001202435.3		c.1790C>A	p.Thr597Asn	missense	Exon 13 of 28	NP_001189364.1	P35498-1
	SCN1A	NM_001353948.2		c.1790C>A	p.Thr597Asn	missense	Exon 12 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.1790C>A	p.Thr597Asn	missense	Exon 14 of 29	ENSP00000501589.1	P35498-1
	SCN1A	ENST00000303395.9	TSL:5	c.1790C>A	p.Thr597Asn	missense	Exon 13 of 28	ENSP00000303540.4	P35498-1
	SCN1A	ENST00000375405.7	TSL:5	c.1790C>A	p.Thr597Asn	missense	Exon 11 of 26	ENSP00000364554.3	P35498-2

Frequencies

GnomAD3 genomes AF: 0.000131 AC: 20 AN: 152144 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.000459

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: 0.0000147

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000279 AC: 7 AN: 251334 AF XY: 0.0000147

Gnomad AFR exome AF: 0.000369

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: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000260 AC: 38 AN: 1461886 Hom.: 0 Cov.: 32 AF XY: 0.0000193 AC XY: 14 AN XY: 727246

African (AFR) AF: 0.000627 AC: 21 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: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 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: 0.0000108 AC: 12 AN: 1112004

Other (OTH) AF: 0.0000828 AC: 5 AN: 60396

GnomAD4 genome AF: 0.000131 AC: 20 AN: 152262 Hom.: 0 Cov.: 32 AF XY: 0.000161 AC XY: 12 AN XY: 74458

African (AFR) AF: 0.000457 AC: 19 AN: 41552

American (AMR) AF: 0.00 AC: 0 AN: 15286

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5164

South Asian (SAS) AF: 0.00 AC: 0 AN: 4826

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10620

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.0000147 AC: 1 AN: 68024

Other (OTH) AF: 0.00 AC: 0 AN: 2114

Alfa AF: 0.000168 Hom.: 0

Bravo AF: 0.000166

ESP6500AA AF: 0.000908 AC: 4

ESP6500EA AF: 0.00 AC: 0

ExAC AF: 0.0000412 AC: 5

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

ClinVar submissions

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	1	2	not provided (3)
-	1	-	Developmental and epileptic encephalopathy (1)
-	-	1	Inborn genetic diseases (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.41
BayesDel_addAF	Benign	-0.13	T
BayesDel_noAF	Benign	-0.12
CADD	Uncertain	24
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.81	D
Eigen	Uncertain	0.46
Eigen_PC	Uncertain	0.50
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Benign	0.84	T
M_CAP	Uncertain	0.20	D
MetaRNN	Benign	0.40	T
MetaSVM	Uncertain	0.70	D
MutationAssessor	Uncertain	2.6	M
PhyloP100		5.7
PrimateAI	Uncertain	0.70	T
PROVEAN	Uncertain	-4.1	D
REVEL	Uncertain	0.56
Sift	Uncertain	0.027	D
Sift4G	Benign	0.18	T
Polyphen		0.26	B
Vest4		0.67
MVP		0.88
MPC		1.8
ClinPred		0.26	T
GERP RS		5.4
Varity_R		0.67
gMVP		0.75
Mutation Taster		=4/96	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: rs149715258; hg19: chr2-166900432;