rs121918748

Variant names:

• chr2-165991783-A-C
• rs121918748
• NM_001165963.4:c.5492T>G

Your query was ambiguous. Multiple possible variants found:

• chr2-165991783-A-C
• chr2-165991783-A-G
• chr2-165991783-A-T

Variant summary

Our verdict is Pathogenic. The variant received 11 ACMG points: 11P and 0B. PM1 PM2 PM5 PP2 PP3_Moderate PP5_Moderate

The NM_001165963.4(SCN1A):​c.5492T>G​(p.Phe1831Cys) 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 Pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. F1831Y) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: SCN1A NM_001165963.4 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 9.32
• Publications: 6 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)

LOC102724058 (HGNC:):

ACMG classification

Our verdict: Pathogenic. The variant received 11 ACMG points.

• PM1: In a hotspot region, there are 9 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 7 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 chr2-165991783-A-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 1475924.
• 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, 0.901
• PP5: Variant 2-165991783-A-C is Pathogenic according to our data. Variant chr2-165991783-A-C is described in ClinVar as Pathogenic. ClinVar VariationId is 419333.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SCN1A	NM_001165963.4	c.5492T>G	p.Phe1831Cys	missense_variant	Exon 29 of 29	ENST00000674923.1	NP_001159435.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SCN1A	ENST00000674923.1	c.5492T>G	p.Phe1831Cys	missense_variant	Exon 29 of 29		NM_001165963.4	ENSP00000501589.1
SCN1A	ENST00000303395.9	c.5492T>G	p.Phe1831Cys	missense_variant	Exon 28 of 28	5		ENSP00000303540.4
SCN1A	ENST00000375405.7	c.5459T>G	p.Phe1820Cys	missense_variant	Exon 26 of 26	5		ENSP00000364554.3
SCN1A	ENST00000409050.2	c.5408T>G	p.Phe1803Cys	missense_variant	Exon 28 of 28	5		ENSP00000386312.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Pathogenic:1

Jul 09, 2015

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The F1831C variant in the SCN1A gene has not been reported previously as a pathogenic variantnor as a benign polymorphism, to our knowledge. The F1831C susbtitution was not observed in approximately6500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project,indicating it is not a common benign variant in these populations. The F1831C variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. This substitution occurs within the C-terminal cytoplasmic domain at a position that is conserved across species. In silico analysis predicts this variant is probably damaging to the protein structure/function. Missense variants in the same and nearby residues (F1831S, A1832P, L1835F, L1839V) have been reported in the Human Gene Mutation Database in association with myoclonic epilepsy and Dravet syndrome (Stenson et al., 2014), supporting the functionalimportance of this region of the protein. We interpret F1831C as a pathogenic variant. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.57	D
BayesDel_noAF	Pathogenic	0.58
CADD	Pathogenic	26
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.93	.;.;.;D;.;D;.;.;.
Eigen	Pathogenic	1.0
Eigen_PC	Pathogenic	0.94
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.98	D;D;D;D;.;.;.;D;D
M_CAP	Pathogenic	0.96	D
MetaRNN	Pathogenic	0.90	D;D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	4.0	.;.;.;H;.;H;.;.;.
PhyloP100		9.3
PrimateAI	Uncertain	0.73	T
PROVEAN	Pathogenic	-7.4	.;.;.;D;.;D;.;D;D
REVEL	Pathogenic	0.92
Sift	Pathogenic	0.0	.;.;.;D;.;D;.;D;D
Sift4G	Pathogenic	0.0	.;.;.;D;.;D;.;D;D
Polyphen		1.0	.;.;.;.;D;.;D;D;.
Vest4		0.90, 0.92, 0.91, 0.91
MutPred		0.53		.;.;.;Loss of ubiquitination at K1827 (P = 0.1264);.;Loss of ubiquitination at K1827 (P = 0.1264);.;.;.;
MVP		0.99
MPC		2.1
ClinPred		1.0	D
GERP RS		5.8
Varity_R		0.83
gMVP		0.99
Mutation Taster		=0/100	disease causing (ClinVar)

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: rs121918748; hg19: chr2-166848293;