rs143867796

chr12-51788745-G-A

Variant summary

Our verdict is Benign. Variant got -21 ACMG points: 0P and 21B. BP4_Strong BP6_Very_Strong BP7 BS1 BS2

The NM_014191.4(SCN8A):c.4278G>A(p.Arg1426=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000314 in 1,609,244 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0017 (0 hom., cov: 31)
  • Exomes 𝑓: 0.00017 (1 hom.)
• Consequence: SCN8A NM_014191.4 synonymous
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:5
• Conservation: PhyloP100: 0.0680

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 Benign. Variant got -21 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.58).
• BP6: Variant 12-51788745-G-A is Benign according to our data. Variant chr12-51788745-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 287399.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=0.068 with no splicing effect.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00167 (254/152196) while in subpopulation AFR AF= 0.00585 (243/41516). AF 95% confidence interval is 0.00525. There are 0 homozygotes in gnomad4. There are 130 alleles in male gnomad4 subpopulation. This position pass quality control queck.
• BS2: High AC in GnomAd at 255 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SCN8A	NM_001330260.2	c.4278G>A	p.Arg1426=	synonymous_variant	23/27	ENST00000627620.5
SCN8A	NM_014191.4	c.4278G>A	p.Arg1426=	synonymous_variant	23/27	ENST00000354534.11
SCN8A	NM_001177984.3	c.4155G>A	p.Arg1385=	synonymous_variant	22/26
SCN8A	NM_001369788.1	c.4155G>A	p.Arg1385=	synonymous_variant	22/26

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SCN8A	ENST00000354534.11	c.4278G>A	p.Arg1426=	synonymous_variant	23/27	1	NM_014191.4	P4
SCN8A	ENST00000627620.5	c.4278G>A	p.Arg1426=	synonymous_variant	23/27	5	NM_001330260.2	A1

Frequencies

GnomAD3 genomes AF: 0.00168 AC: 255 AN: 152078 Hom.: 0 Cov.: 31

Gnomad AFR AF: 0.00589

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000524

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: 0.00144

GnomAD3 exomes AF: 0.000427 AC: 106 AN: 248372 Hom.: 0 AF XY: 0.000313 AC XY: 42 AN XY: 134242

Gnomad AFR exome AF: 0.00588

Gnomad AMR exome AF: 0.000147

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000100

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000266

Gnomad OTH exome AF: 0.000166

GnomAD4 exome AF: 0.000172 AC: 251 AN: 1457048 Hom.: 1 Cov.: 30 AF XY: 0.000153 AC XY: 111 AN XY: 724692

Gnomad4 AFR exome AF: 0.00653

Gnomad4 AMR exome AF: 0.000157

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000352

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000270

Gnomad4 OTH exome AF: 0.000283

GnomAD4 genome AF: 0.00167 AC: 254 AN: 152196 Hom.: 0 Cov.: 31 AF XY: 0.00175 AC XY: 130 AN XY: 74412

Gnomad4 AFR AF: 0.00585

Gnomad4 AMR AF: 0.000523

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00143

Alfa AF: 0.000798 Hom.: 0

Bravo AF: 0.00181

Asia WGS AF: 0.000289 AC: 1 AN: 3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:2

Benign, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Jun 02, 2016	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	May 08, 2015	This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Cognitive impairment with or without cerebellar ataxia;C3281191:Developmental and epileptic encephalopathy, 13;C4310728:Seizures, benign familial infantile, 5;C5193056:Myoclonus, familial, 2 Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Aug 03, 2021

- -

Inborn genetic diseases Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

May 13, 2016

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Early infantile epileptic encephalopathy with suppression bursts Benign:1

Benign, criteria provided, single submitter

clinical testing

Invitae

Feb 01, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.58
Cadd	Benign	0.92
Dann	Benign	0.57

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: rs143867796; hg19: chr12-52182529; COSMIC: COSV104666062; COSMIC: COSV104666062;