2-166073487-G-C

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 5P and 10B. PM1PM5PP2BP4_StrongBP6_ModerateBS2

The NM_001165963.4(SCN1A):c.135C>G(p.Asp45Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000112 in 1,614,054 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D45N) has been classified as Pathogenic.

Frequency

Genomes: 𝑓 0.000026 ( 0 hom., cov: 31)

Exomes 𝑓: 0.0000096 ( 0 hom. )

Consequence

SCN1A
NM_001165963.4 missense

Scores

Clinical Significance

Likely benign criteria provided, single submitter B:1

Conservation

PhyloP100: -1.02

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:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -5 ACMG points.

PM1

In a region_of_interest Disordered (size 32) in uniprot entity SCN1A_HUMAN there are 5 pathogenic changes around while only 0 benign (100%) in NM_001165963.4

PM5

Other missense variant is known to change same aminoacid residue: Variant chr2-166073489-C-T is described in Lovd as [Pathogenic].

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.

BP4

Computational evidence support a benign effect (MetaRNN=0.03589338).

BP6

Variant 2-166073487-G-C is Benign according to our data. Variant chr2-166073487-G-C is described in ClinVar as [Likely_benign]. Clinvar id is 530417.Status of the report is criteria_provided_single_submitter, 1 stars.

BS2

High AC in GnomAdExome4 at 14 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SCN1A	NM_001165963.4 link	c.135C>G	p.Asp45Glu	missense_variant	Exon 4 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.135C>G	p.Asp45Glu	missense_variant	Exon 4 of 29		NM_001165963.4	ENSP00000501589.1	P35498-1
SCN1A	ENST00000303395.9 link	c.135C>G	p.Asp45Glu	missense_variant	Exon 3 of 28	5		ENSP00000303540.4	P35498-1
SCN1A	ENST00000375405.7 link	c.135C>G	p.Asp45Glu	missense_variant	Exon 1 of 26	5		ENSP00000364554.3	P35498-2
SCN1A	ENST00000409050.1 link	c.135C>G	p.Asp45Glu	missense_variant	Exon 1 of 26	5		ENSP00000386312.1	P35498-3

Frequencies

GnomAD3 genomes

AF:

0.0000263

AC:

AN:

152056

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000578

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

GnomAD3 exomes

AF:

0.0000597

AC:

AN:

251432

Hom.:

AF XY:

0.0000736

AC XY:

AN XY:

135886

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000816

Gnomad SAS 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:

0.00000958

AC:

AN:

1461880

Hom.:

Cov.:

AF XY:

0.0000110

AC XY:

AN XY:

727240

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.000327

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000263

AC:

AN:

152174

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74392

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000579

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000453

ExAC

AF:

0.0000576

AC:

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Early infantile epileptic encephalopathy with suppression bursts

Benign:1

Oct 24, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.088

BayesDel_addAF

Benign

-0.21

BayesDel_noAF

Benign

-0.16

CADD

Benign

0.052

DANN

Benign

0.81

DEOGEN2

Benign

0.38

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

Eigen

Benign

-1.4

Eigen_PC

Benign

-1.3

FATHMM_MKL

Benign

0.22

LIST_S2

Benign

0.70

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

M_CAP

Uncertain

0.088

MetaRNN

Benign

0.036

T;T;T;T;T;T;T;T;T;T

MetaSVM

Benign

-0.39

MutationAssessor

Benign

-0.050

.;.;.;N;N;.;N;N;N;N

PrimateAI

Benign

0.44

PROVEAN

Benign

-0.93

.;.;.;N;.;.;N;.;N;N

REVEL

Uncertain

0.49

Sift

Benign

0.56

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

Sift4G

Benign

1.0

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

Polyphen

0.23

.;.;.;.;B;.;.;B;B;.

Vest4

0.14, 0.20, 0.24, 0.22

MutPred

0.34

Gain of methylation at K41 (P = 0.1203);Gain of methylation at K41 (P = 0.1203);Gain of methylation at K41 (P = 0.1203);Gain of methylation at K41 (P = 0.1203);Gain of methylation at K41 (P = 0.1203);Gain of methylation at K41 (P = 0.1203);Gain of methylation at K41 (P = 0.1203);Gain of methylation at K41 (P = 0.1203);Gain of methylation at K41 (P = 0.1203);Gain of methylation at K41 (P = 0.1203);

MVP

0.85

MPC

0.63

ClinPred

0.090

GERP RS

-5.1

Varity_R

0.061

gMVP

0.39

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

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