rs3919196

Variant names:

• chr2-166135289-C-T
• rs3919196
• ENST00000409050.2:c.-188+13758G>A

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BA1

The ENST00000409050.2(SCN1A):​c.-188+13758G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.241 in 152,082 control chromosomes in the GnomAD database, including 4,523 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.24 (4523 hom., cov: 32)
• Consequence: SCN1A ENST00000409050.2 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.114
• Publications: 4 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)

ACMG classification

Our verdict: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.82).
• BA1: GnomAd4 highest subpopulation (NFE) allele frequency at 95% confidence interval = 0.256 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SCN1A	NM_001202435.3	c.-142+13758G>A		intron_variant	Intron 1 of 27		NP_001189364.1
SCN1A	NM_001353949.2	c.-50+13758G>A		intron_variant	Intron 1 of 26		NP_001340878.1
SCN1A	NM_001353950.2	c.-142+13758G>A		intron_variant	Intron 1 of 27		NP_001340879.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SCN1A	ENST00000409050.2	c.-188+13758G>A		intron_variant	Intron 1 of 27	5		ENSP00000386312.1

Frequencies

GnomAD3 genomes AF: 0.241 AC: 36654 AN: 151964 Hom.: 4519 Cov.: 32

Gnomad AFR AF: 0.235

Gnomad AMI AF: 0.182

Gnomad AMR AF: 0.209

Gnomad ASJ AF: 0.305

Gnomad EAS AF: 0.166

Gnomad SAS AF: 0.179

Gnomad FIN AF: 0.246

Gnomad MID AF: 0.212

Gnomad NFE AF: 0.259

Gnomad OTH AF: 0.259

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.241 AC: 36681 AN: 152082 Hom.: 4523 Cov.: 32 AF XY: 0.237 AC XY: 17638 AN XY: 74328

African (AFR) AF: 0.234 AC: 9723 AN: 41464

American (AMR) AF: 0.208 AC: 3187 AN: 15286

Ashkenazi Jewish (ASJ) AF: 0.305 AC: 1060 AN: 3470

East Asian (EAS) AF: 0.166 AC: 859 AN: 5164

South Asian (SAS) AF: 0.179 AC: 863 AN: 4822

European-Finnish (FIN) AF: 0.246 AC: 2606 AN: 10572

Middle Eastern (MID) AF: 0.221 AC: 65 AN: 294

European-Non Finnish (NFE) AF: 0.259 AC: 17603 AN: 67988

Other (OTH) AF: 0.260 AC: 549 AN: 2110

Alfa AF: 0.251 Hom.: 600

Bravo AF: 0.237

Asia WGS AF: 0.189 AC: 656 AN: 3474

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.82
CADD	Benign	1.9
DANN	Benign	0.59
PhyloP100		-0.11

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs3919196; hg19: chr2-166991799;