rs794726718

Variant names:

Your query was ambiguous. Multiple possible variants found:

Variant summary

Our verdict is Pathogenic. The variant received 17 ACMG points: 17P and 0B. PM1PM2PM5PP2PP3_ModeratePP5_Very_Strong

The NM_001165963.4(SCN1A):c.2792G>T(p.Arg931Leu) 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 Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R931H) has been classified as Pathogenic.

Frequency

Genomes: not found (cov: 32)

Consequence

SCN1A
NM_001165963.4 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3

Conservation

PhyloP100: 7.90

Publications

12 publications found

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:

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ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 17 ACMG points.

PM1

In a hotspot region, there are 19 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 12 uncertain in NM_001165963.4

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chr2-166037930-C-T is described in ClinVar as Pathogenic. ClinVar VariationId is 189869.Status of the report is reviewed_by_expert_panel, 3 stars.

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

PP3

MetaRNN computational evidence supports a deleterious effect, 0.935

PP5

Variant 2-166037930-C-A is Pathogenic according to our data. Variant chr2-166037930-C-A is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 837128.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.2792G>T	p.Arg931Leu	missense_variant	Exon 18 of 29	ENST00000674923.1	NP_001159435.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein
SCN1A	ENST00000674923.1 link	c.2792G>T	p.Arg931Leu	missense_variant	Exon 18 of 29		NM_001165963.4	ENSP00000501589.1
SCN1A	ENST00000303395.9 link	c.2792G>T	p.Arg931Leu	missense_variant	Exon 17 of 28	5		ENSP00000303540.4
SCN1A	ENST00000375405.7 link	c.2759G>T	p.Arg920Leu	missense_variant	Exon 15 of 26	5		ENSP00000364554.3
SCN1A	ENST00000409050.2 link	c.2708G>T	p.Arg903Leu	missense_variant	Exon 17 of 28	5		ENSP00000386312.1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

Cov.:

GnomAD4 genome

Cov.:

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Developmental and epileptic encephalopathy

Pathogenic:1

Aug 13, 2021

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not provided

Pathogenic:1

Jan 23, 2025

GeneDx

Significance: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; This substitution is predicted to be within the extracellular loop between the S5 and S6 transmembrane segments of the second homologous domain; This variant is associated with the following publications: (PMID: Steinhoff2021[article], 36939041, 37329172) -

Severe myoclonic epilepsy in infancy

Pathogenic:1

Feb 26, 2019

Baylor Genetics

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant was determined to be likely pathogenic according to ACMG Guidelines, 2015 [PMID:25741868]. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.99

BayesDel_addAF

Pathogenic

0.56

BayesDel_noAF

Pathogenic

0.57

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.98

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

Eigen

Pathogenic

0.92

Eigen_PC

Pathogenic

0.85

FATHMM_MKL

Uncertain

0.95

LIST_S2

Pathogenic

0.98

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

M_CAP

Pathogenic

0.94

MetaRNN

Pathogenic

0.93

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

MetaSVM

Pathogenic

1.1

MutationAssessor

Pathogenic

3.2

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

PhyloP100

7.9

PrimateAI

Uncertain

0.77

PROVEAN

Pathogenic

-6.8

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

REVEL

Pathogenic

0.97

Sift

Pathogenic

0.0

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

Sift4G

Uncertain

0.0030

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

Polyphen

0.97, 0.98

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

Vest4

0.88, 0.92, 0.94, 0.96

MutPred

0.66

.;Loss of catalytic residue at R931 (P = 0.0564);.;Loss of catalytic residue at R931 (P = 0.0564);.;.;Loss of catalytic residue at R931 (P = 0.0564);.;.;.;

MVP

0.99

MPC

2.4

ClinPred

1.0

GERP RS

5.2

Varity_R

0.95

gMVP

1.0

Mutation Taster

=0/100

disease causing (ClinVar)

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over