chr19-35032550-C-A

Position:

• chr19-35032550-C-A

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PVS1 PM2

The ENST00000262631.11(SCN1B):​c.63C>A​(p.Cys21Ter) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. C21C) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: SCN1B ENST00000262631.11 stop_gained
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.18

Genes affected

SCN1B (HGNC:10586): (sodium voltage-gated channel beta subunit 1) Voltage-gated sodium channels are heteromeric proteins that function in the generation and propagation of action potentials in muscle and neuronal cells. They are composed of one alpha and two beta subunits, where the alpha subunit provides channel activity and the beta-1 subunit modulates the kinetics of channel inactivation. This gene encodes a sodium channel beta-1 subunit. Mutations in this gene result in generalized epilepsy with febrile seizures plus, Brugada syndrome 5, and defects in cardiac conduction. Multiple transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, Oct 2009]

ACMG classification

Verdict is Pathogenic. Variant got 10 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant located near the start codon (<100nt), not predicted to undergo nonsense mediated mRNA decay. There are 22 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SCN1B	NM_001037.5	c.63C>A	p.Cys21Ter	stop_gained	2/6	ENST00000262631.11	NP_001028.1
SCN1B	NM_199037.5	c.63C>A	p.Cys21Ter	stop_gained	2/3		NP_950238.1
SCN1B	NM_001321605.2	c.-37C>A		5_prime_UTR_variant	2/6		NP_001308534.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SCN1B	ENST00000262631.11	c.63C>A	p.Cys21Ter	stop_gained	2/6	1	NM_001037.5	ENSP00000262631	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.60	D
BayesDel_noAF	Pathogenic	0.20
CADD	Uncertain	25
DANN	Uncertain	0.99
Eigen	Benign	-0.47
Eigen_PC	Benign	-0.85
FATHMM_MKL	Benign	0.21	N
MutationTaster	Benign	1.0	A;A
Vest4		0.90
GERP RS		-7.4
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7

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: rs200339565; hg19: chr19-35523454;