dbSNP rs144691638: SCN1A:p.Met1856Ile (chr2-165991707-C-T) – ACMG Classification: Likely_benign (-6 pts)

Variant summary

Our verdict is Likely benign. The variant received -6 ACMG points: 5P and 11B. PM1PM5PP2BP4_ModerateBP6BS1BS2

The NM_001165963.4(SCN1A):c.5568G>A(p.Met1856Ile) variant causes a missense change. The variant allele was found at a frequency of 0.0000725 in 1,613,876 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). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. M1856T) has been classified as Likely pathogenic. The gene SCN1A is included in the ClinGen Criteria Specification Registry.

Frequency

Genomes: 𝑓 0.00035 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000044 ( 0 hom. )

Consequence

SCN1A
NM_001165963.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:4

Conservation

PhyloP100: 4.86

Publications

2 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:

LOC102724058 (HGNC:):

LOC102724058 links:

Genome browser will be placed here

ACMG classification

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

Classification was made for transcript

Our verdict: Likely_benign. The variant received -6 ACMG points.

PM1

In a hotspot region, there are 8 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 11 uncertain in NM_001165963.4

PM5

Other missense variant is known to change same aminoacid residue: Variant chr2-165991708-A-G is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 206870.

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=0.117314756).

BP6

Variant 2-165991707-C-T is Benign according to our data. Variant chr2-165991707-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 206871.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.000348 (53/152124) while in subpopulation AFR AF = 0.00123 (51/41508). AF 95% confidence interval is 0.000959. There are 0 homozygotes in GnomAd4. There are 24 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High AC in GnomAd4 at 53 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

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
SCN1A	NM_001165963.4	MANE Select	c.5568G>A	p.Met1856Ile	missense	Exon 29 of 29	NP_001159435.1	P35498-1
SCN1A	NM_001202435.3		c.5568G>A	p.Met1856Ile	missense	Exon 28 of 28	NP_001189364.1	P35498-1
SCN1A	NM_001353948.2		c.5568G>A	p.Met1856Ile	missense	Exon 27 of 27	NP_001340877.1	P35498-1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
SCN1A	ENST00000674923.1	MANE Select	c.5568G>A	p.Met1856Ile	missense	Exon 29 of 29	ENSP00000501589.1	P35498-1
SCN1A	ENST00000303395.9	TSL:5	c.5568G>A	p.Met1856Ile	missense	Exon 28 of 28	ENSP00000303540.4	P35498-1
SCN1A	ENST00000375405.7	TSL:5	c.5535G>A	p.Met1845Ile	missense	Exon 26 of 26	ENSP00000364554.3	P35498-2

Frequencies

GnomAD3 genomes

AF:

0.000349

AC:

AN:

152006

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00123

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000108

AC:

AN:

250732

AF XY:

0.000111

show subpopulations

Gnomad AFR exome

AF:

0.00142

Gnomad AMR exome

AF:

0.000116

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:

0.0000438

AC:

AN:

1461752

Hom.:

Cov.:

AF XY:

0.0000509

AC XY:

AN XY:

727192

show subpopulations

African (AFR)

AF:

0.00161

AC:

AN:

33466

American (AMR)

AF:

0.0000895

AC:

AN:

44704

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26130

East Asian (EAS)

AF:

0.00

AC:

AN:

39694

South Asian (SAS)

AF:

0.00

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53418

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5762

European-Non Finnish (NFE)

AF:

0.00000270

AC:

AN:

1111932

Other (OTH)

AF:

0.0000497

AC:

AN:

60388

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.482

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000348

AC:

AN:

152124

Hom.:

Cov.:

AF XY:

0.000323

AC XY:

AN XY:

74366

show subpopulations

African (AFR)

AF:

0.00123

AC:

AN:

41508

American (AMR)

AF:

0.000131

AC:

AN:

15260

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5140

South Asian (SAS)

AF:

0.00

AC:

AN:

4820

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10616

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

67990

Other (OTH)

AF:

0.00

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.486

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000652

Hom.:

Bravo

AF:

0.000397

ESP6500AA

AF:

0.00136

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000107

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

ClinVar submissions

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (2)

Developmental and epileptic encephalopathy (1)

Inborn genetic diseases (1)

not specified (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.63

BayesDel_addAF

Uncertain

0.12

BayesDel_noAF

Pathogenic

0.37

CADD

Uncertain

(source)

DANN

Uncertain

0.98

DEOGEN2

Uncertain

0.70

Eigen

Benign

0.12

Eigen_PC

Uncertain

0.29

FATHMM_MKL

Uncertain

0.96

LIST_S2

Uncertain

0.89

M_CAP

Uncertain

0.18

MetaRNN

Benign

0.12

MetaSVM

Uncertain

0.44

MutationAssessor

Benign

1.8

PhyloP100

4.9

PrimateAI

Uncertain

0.73

PROVEAN

Uncertain

-3.5

REVEL

Pathogenic

0.66

Sift

Uncertain

0.0010

Sift4G

Benign

0.59

Polyphen

0.060

Vest4

0.65

MutPred

0.50

Loss of helix (P = 0.1706)

MVP

0.99

MPC

1.1

ClinPred

0.14

GERP RS

5.6

Varity_R

0.71

gMVP

0.84

Mutation Taster

=7/93

disease causing

(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

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over