rs1057520149

Positions:

• chr12-51790479-C-A
• chr12-51790479-C-T

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PP2 PP3 PP5_Moderate

The NM_001330260.2(SCN8A):​c.4501C>A​(p.Gln1501Lys) 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 (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: SCN8A NM_001330260.2 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 7.91

Genes affected

SCN8A (HGNC:10596): (sodium voltage-gated channel alpha subunit 8) This gene encodes a member of the sodium channel alpha subunit gene family. The encoded protein forms the ion pore region of the voltage-gated sodium channel. This protein is essential for the rapid membrane depolarization that occurs during the formation of the action potential in excitable neurons. Mutations in this gene are associated with cognitive disability, pancerebellar atrophy and ataxia. Alternate splicing results in multiple transcript variants.[provided by RefSeq, May 2010]

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), SCN8A. . Gene score misZ 0.78755 (greater than the threshold 3.09). Trascript score misZ 10.436 (greater than threshold 3.09). GenCC has associacion of gene with myoclonus, familial, 2, infantile convulsions and choreoathetosis, cognitive impairment with or without cerebellar ataxia, undetermined early-onset epileptic encephalopathy, complex neurodevelopmental disorder, developmental and epileptic encephalopathy, 13, benign familial infantile epilepsy, seizures, benign familial infantile, 5.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.772
• PP5: Variant 12-51790479-C-A is Pathogenic according to our data. Variant chr12-51790479-C-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 377169.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SCN8A	NM_001330260.2	c.4501C>A	p.Gln1501Lys	missense_variant	25/27	ENST00000627620.5	NP_001317189.1
SCN8A	NM_014191.4	c.4501C>A	p.Gln1501Lys	missense_variant	25/27	ENST00000354534.11	NP_055006.1
SCN8A	NM_001177984.3	c.4378C>A	p.Gln1460Lys	missense_variant	24/26		NP_001171455.1
SCN8A	NM_001369788.1	c.4378C>A	p.Gln1460Lys	missense_variant	24/26		NP_001356717.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SCN8A	ENST00000354534.11	c.4501C>A	p.Gln1501Lys	missense_variant	25/27	1	NM_014191.4	ENSP00000346534.4
SCN8A	ENST00000627620.5	c.4501C>A	p.Gln1501Lys	missense_variant	25/27	5	NM_001330260.2	ENSP00000487583.2
SCN8A	ENST00000599343.5	c.4534C>A	p.Gln1512Lys	missense_variant	24/26	5		ENSP00000476447.3
SCN8A	ENST00000355133.7	c.4378C>A	p.Gln1460Lys	missense_variant	23/25	1		ENSP00000347255.4

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 33

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics

Jan 05, 2017

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.72
BayesDel_addAF	Pathogenic	0.19	D
BayesDel_noAF	Uncertain	0.040
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.78	D;.;.;.;.
Eigen	Uncertain	0.65
Eigen_PC	Uncertain	0.65
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.96	D;D;.;D;D
M_CAP	Pathogenic	0.68	D
MetaRNN	Pathogenic	0.77	D;D;D;D;D
MetaSVM	Pathogenic	0.94	D
MutationAssessor	Uncertain	2.5	M;.;.;.;M
PrimateAI	Pathogenic	0.80	T
PROVEAN	Uncertain	-3.7	D;D;D;.;.
REVEL	Pathogenic	0.78
Sift	Pathogenic	0.0	D;D;D;.;.
Sift4G	Benign	0.16	T;T;T;T;T
Polyphen		0.96	D;.;.;.;.
Vest4		0.61
MutPred		0.40		Gain of methylation at Q1501 (P = 0.0037);.;.;.;Gain of methylation at Q1501 (P = 0.0037);
MVP		0.96
MPC		1.9
ClinPred		1.0	D
GERP RS		4.6
Varity_R		0.89
gMVP		0.97

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

Other links and lift over

dbSNP: rs1057520149; hg19: chr12-52184263;