rs794726822

Variant names:

Your query was ambiguous. Multiple possible variants found:

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PS1PM1PM2PP2PP3PP5_Very_Strong

The NM_001165963.4(SCN1A):c.4044G>C(p.Met1348Ile) variant causes a missense change. The variant allele was found at a frequency of 0.000000685 in 1,459,520 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another nucleotide change resulting in the same amino acid substitution has been previously reported as Pathogenic in Lovd.

Frequency

Genomes: not found (cov: 31)

Exomes 𝑓: 6.9e-7 ( 0 hom. )

Consequence

SCN1A
NM_001165963.4 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:2

Conservation

PhyloP100: 4.24

Variant links:

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 links:

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

SCN1A-AS1 links:

LOC102724058 (HGNC:):

LOC102724058 links:

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ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 18 ACMG points.

PS1

Transcript NM_001165963.4 (SCN1A) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in Lovd

PM1

In a transmembrane_region Helical; Name=S5 of repeat III (size 19) in uniprot entity SCN1A_HUMAN there are 9 pathogenic changes around while only 0 benign (100%) in NM_001165963.4

PM2

Very rare variant in population databases, with high coverage;

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 migraine, familial hemiplegic, 3, familial hemiplegic migraine, Dravet syndrome, malignant migrating partial seizures of infancy, generalized epilepsy with febrile seizures plus, myoclonic-astatic epilepsy, developmental and epileptic encephalopathy, developmental and epileptic encephalopathy, 6, familial or sporadic hemiplegic migraine, arthrogryposis, Lennox-Gastaut syndrome, generalized epilepsy with febrile seizures plus, type 2.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.821

PP5

Variant 2-166002712-C-G is Pathogenic according to our data. Variant chr2-166002712-C-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 429551.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SCN1A	NM_001165963.4 link	c.4044G>C	p.Met1348Ile	missense_variant	Exon 24 of 29	ENST00000674923.1	NP_001159435.1	P35498-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
SCN1A	ENST00000674923.1 link	c.4044G>C	p.Met1348Ile	missense_variant	Exon 24 of 29		NM_001165963.4	ENSP00000501589.1	P35498-1
SCN1A	ENST00000303395.9 link	c.4044G>C	p.Met1348Ile	missense_variant	Exon 23 of 28	5		ENSP00000303540.4	P35498-1
SCN1A	ENST00000375405.7 link	c.4011G>C	p.Met1337Ile	missense_variant	Exon 21 of 26	5		ENSP00000364554.3	P35498-2
SCN1A	ENST00000409050.1 link	c.3960G>C	p.Met1320Ile	missense_variant	Exon 21 of 26	5		ENSP00000386312.1	P35498-3

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.85e-7

AC:

AN:

1459520

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

726034

show subpopulations

Gnomad4 AFR exome

AF:

0.0000300

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:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

Bravo

AF:

0.00000756

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Pathogenic:1

Mar 27, 2025

GeneDx

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Has not been previously published as pathogenic or benign to our knowledge; This substitution is predicted to be within the transmembrane segment S5 of the third homologous domain -

Developmental and epileptic encephalopathy 6B

Pathogenic:1

Aug 05, 2024

Institute of Human Genetics, University of Leipzig Medical Center

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Criteria applied: PS1,PM1,PM2,PM5_SUP,PP3 -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.84

BayesDel_addAF

Uncertain

0.15

BayesDel_noAF

Uncertain

-0.020

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.94

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

Eigen

Uncertain

0.44

Eigen_PC

Uncertain

0.49

FATHMM_MKL

Uncertain

0.94

LIST_S2

Benign

0.85

T;T;T;.;T;.;.;T;T

M_CAP

Pathogenic

0.43

MetaRNN

Pathogenic

0.82

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

MetaSVM

Pathogenic

1.1

MutationAssessor

Uncertain

2.1

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

PrimateAI

Pathogenic

0.91

PROVEAN

Uncertain

-3.7

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

REVEL

Pathogenic

0.69

Sift

Uncertain

0.0070

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

Sift4G

Benign

0.11

.;.;T;.;.;T;.;T;T

Polyphen

0.89, 0.94

.;.;P;P;.;P;P;P;.

Vest4

0.70, 0.81, 0.78, 0.71

MutPred

0.75

.;.;Gain of catalytic residue at L1351 (P = 0.3928);.;.;Gain of catalytic residue at L1351 (P = 0.3928);.;.;.;

MVP

0.93

MPC

0.81

ClinPred

0.98

GERP RS

4.5

Varity_R

0.64

gMVP

0.94

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.040

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over