NM_001165963.4:c.434T>A

Variant names:

• chr2-166056450-A-T
• rs121918631
• NM_001165963.4:c.434T>A

Variant summary

Our verdict is Likely pathogenic. Variant got 9 ACMG points: 9P and 0B. PM2 PP2 PP3_Strong PP5_Moderate

The NM_001165963.4(SCN1A):​c.434T>A​(p.Met145Lys) 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. 12/21 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: SCN1A NM_001165963.4 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 9.23

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)

ACMG classification

Verdict is Likely_pathogenic. Variant got 9 ACMG points.

• 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, 0.955
• PP5: Variant 2-166056450-A-T is Pathogenic according to our data. Variant chr2-166056450-A-T is described in ClinVar as [Pathogenic]. Clinvar id is 206739.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.434T>A	p.Met145Lys	missense_variant	Exon 6 of 29	ENST00000674923.1	NP_001159435.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SCN1A	ENST00000674923.1	c.434T>A	p.Met145Lys	missense_variant	Exon 6 of 29		NM_001165963.4	ENSP00000501589.1
SCN1A	ENST00000303395.9	c.434T>A	p.Met145Lys	missense_variant	Exon 5 of 28	5		ENSP00000303540.4
SCN1A	ENST00000375405.7	c.434T>A	p.Met145Lys	missense_variant	Exon 3 of 26	5		ENSP00000364554.3
SCN1A	ENST00000409050.1	c.434T>A	p.Met145Lys	missense_variant	Exon 3 of 26	5		ENSP00000386312.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 28

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Pathogenic:1

Sep 11, 2012

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

p.Met145Lys (ATG>AAG):c.434 T>A in exon 3 of the SCN1A gene (NM_001165963.1) The Met145Lys missense change has not been published as a mutation, nor has it been reported as a benign polymorphism to our knowledge. However, a different amino acid substitution at the same position, Met145Thr, was previously reported to co-segregate with febrile seizures in a large family, and functional studies demonstrated abnormalities consistent with a loss-of-function mutation (Mantegazza et al., 2005; Colosimo et al., 2007). The NHLBI ESP Exome Variant Project has not identified Met145Lys in approximately 6,500 individuals of European or African American ethnicity, indicating that it is not a common benign variant in these populations. The amino acid substitution is non-conservative, as an uncharged, non-polar Methionine residue is replaced by a positively charged Lysine residue. Met145Lys alters a highly conserved position in the S1 segment of the first transmembrane domain, and other missense mutations in this region of the protein have been reported in association with SCN1A-related disorders in an external mutation database. Therefore, Met145Lys is considered a disease-causing mutation. The variant is found in INFANT-EPI panel(s). -

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	0.99	.;.;.;D;.;.;D;.;.;.
Eigen	Pathogenic	0.97
Eigen_PC	Pathogenic	0.91
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.98	D;D;D;D;.;D;.;.;D;D
M_CAP	Pathogenic	0.93	D
MetaRNN	Pathogenic	0.95	D;D;D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	4.0	.;.;.;H;H;.;H;H;H;H
PrimateAI	Pathogenic	0.88	D
PROVEAN	Pathogenic	-5.5	.;.;.;D;.;.;D;.;D;D
REVEL	Pathogenic	0.98
Sift	Pathogenic	0.0	.;.;.;D;.;.;D;.;D;D
Sift4G	Pathogenic	0.0	.;.;.;D;.;.;D;.;D;D
Polyphen		0.97, 0.94	.;.;.;D;P;.;D;P;P;.
Vest4		0.91, 0.92, 0.92, 0.93
MutPred		0.78		Loss of catalytic residue at M147 (P = 0.0259);Loss of catalytic residue at M147 (P = 0.0259);Loss of catalytic residue at M147 (P = 0.0259);Loss of catalytic residue at M147 (P = 0.0259);Loss of catalytic residue at M147 (P = 0.0259);Loss of catalytic residue at M147 (P = 0.0259);Loss of catalytic residue at M147 (P = 0.0259);Loss of catalytic residue at M147 (P = 0.0259);Loss of catalytic residue at M147 (P = 0.0259);Loss of catalytic residue at M147 (P = 0.0259);
MVP		0.99
MPC		1.0
ClinPred		1.0	D
GERP RS		5.7
Varity_R		0.98
gMVP		1.0

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		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

Other links and lift over

dbSNP: rs121918631; hg19: chr2-166912960;